Summaries of Physical Research in Metallurgy, Solid State Physics, and Ceramics

Total Page:16

File Type:pdf, Size:1020Kb

Summaries of Physical Research in Metallurgy, Solid State Physics, and Ceramics TID-4005(Pt. 1, 5th Ed.) METALLURGY AND CERAMICS SUMMARIES OF PHYSICAL RESEARCH IN METALLURGY, SOLID STATE PHYSICS, AND CERAMICS Edited by Ralph R. Nash July 1959 [TIS Issuance Date] Division of Research, AEC Washington, D. C. 20,~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"~""·nt~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~.:::; *~~~~~~~~~~~~~~~~~Vr~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~iii::i::lll::l:::~ ~ , ~ ~ ~ ~ ~ ~ ~ """"""" V-160"r-4411!.A!MCI~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~r:::ii::::i::::iii~ii: ..O'. UNITED STATES ATOMIC ENERGYrCOMMISSION Technical Information Service ..................... ::iiu;;ii:::::~:i ;::::::iif ·· · UNITEDSTATESATOMC ENERGY COMMISSION~~~~~~~~~~~~~ieiiijjjiiisliilii:iiilii ·· I TechnicalService~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~···,r::,·.Information UNITED STATES .ATOMIC ENERGY COMMISSION Technical Information Service LEGAL NOTICE the United This report was prepared as an account of Government sponsored work. Neither States, nor the Commission, nor any person acting on behalf of the Commission: to the accu- A. Makes any warranty or representation, expressed or implied, with respect or that the use racy, completeness, or usefulness of the information contained in this report, may not infringe of any Information, apparatus, method, or process disclosed in this report privately owned rights; or from the B. Assumes any liabilities with respect to the use of, or for damages resulting use of any information, apparatus, method, or process disclosed in this report. any em- As used in the above, "person acting on behalf of the Commission" includes the extent that ployee or contractor of the Commission, or employee of such contractor, to prepares, such employee or contractor of the Commission, or employee of such contractor or contract disseminates, or provides access to, any information pursuant to his employment with the Commission, or his employment with such contractor. This report has been reproduced directly from the best available copy. Printed in USA. Price $2.75. Available from the Office of Technical Services, Department of Commerce, Washington 25, D. C. ,.. AEC Technical Information Service Extension Oak Ridge. Tennesee C0 4 UNITED STATES ATOMIC ENERGY COMMISSION Post Office Box 62, Oak Ridge, Tennessee TMsRLM October 30, 1959 MEMDRANDUM TOt Recipients of TID-4005 (Pt. 1, 5th Edition) FROM s Robert L. Shannon, Chief Technical Information Service Extension SUBJECT : CORRECTED INDEXES FOR TID-4005 (PT. 1, 5TH EDITION) SUMMARIES OF PHYSICAL RESEARCH IN METALLURGY, SOLID STATE PHYSICS, AND CERAMICS The July, 1959 issuance of the subject publication contained a "Contractor Index" and a "Subject index" with section rather than page references for the individual entries. This memorandum transmits new versions of the indexes, using page references, which are intended to be inserted in those copies of TID-4005 (Pt. 1, 5th Edition) which were originally distributed. Enclosure: Corrected Indexes TID-4005 (Pt. 1, 5th Ed.) CONTRACTOR INDEX Ames Laboratory, Iowa State College, G. Burnet, O. N. Carlson, P. Chiotti, A. H. Daane, R. W. Fisher, W. Larsen, R. E. McCarley, G. Murphy, E. Olson, D. T. Peterson, J. Powell, R. E. Rundle, J. F. Smith, M. Smutz, F. H. Spedding, A. F. Voigt, D. Wilder, and H. A. Wilhelm, I-A,-5 R. G. Barnes, G. C. Danielson, R. H. Good, D. E. Hudson, L. D. Jennings, J. M. Keller, S. Legvold, R. E. Rundle, F. H. Spedding, and C. A. Swenson, II-A, -61 Anderson Physical Laboratory, Scott Anderson, I-A,-8 Argonne National Laboratory, L. Lloyd, E. S. Fisher, S. J. Rothman, M. Mueller, and W. Yaio, I-A,-9 A. E. Dwight, S. T. Zegler, J. Darby, and M. V. Nevitt, I-A,-ll L. Kelman, B. Blumenthal, C. Biver, and E. Benson, I-A,-12 M. Volpe and P. Stablein. I-C,-37 J. E. Draley, W. E. Ruther, S. Mori, R. D. Misch, and F. E. DeBoer, I-D,-45 S. S. Sidhu, M. B. Nevitt, M. Mueller, A. Dwight, and L. Heaton, II-E,-131 S. H. Paine, F. Taraba, A. D. Fischer, B. A. Loomis, and K. Myles, III-C,-189 Arkansas, University of, P. C. Sharrah and R. F. Kruh, II-C,-113 Armour Research Foundation, D. J. McPherson, I-A-13 L. E. Tanner and D. W. Levinson, I-A,-14 Atomics International, A Division of North American Aviation, Inc., G. W. Lehman, T. G. Berlincourt, R. R. Hake, and F. J. Hon, II-A, -66 W. G. Bramer and C. J. Meechan, II-A,-67 A. Sosin and J. A. Brinkman, III-A,-151 Battelle Memorial Institute, A. A. Bauer, I-A,-15 F. Holden, I-A,-16 A. Tripler and A. Austin, I-B,-31 W. M. Albrecht, I-E,-53 H. H. Krause, Jr., I-E,-54 Bausch and Lomb Optical Company, N. J. Kreidl, III-B-177 195 Brookhaven National Laboratory, Associated Universities, Inc., D. H. Gurinsky, J. R. Weeks, J. S. Bryner, W. B. Brodsky, and R. A. Meyer, I-A,-17 G. J. Dienes, B. C. Frazer, M. Kay, T. Mitsui, R. Nathans, G. H. Vineyard, W. Whittemore, R. Pepinsky, II-A,-68 G. J. Dienes, G. H. Vineyard, A. Damask, L. Porter, D. Keating, P. W. Levy, A. Goland, D. Rosenblatt, R. Hatcher, and J. Gibson, III-A,-152 Brown University, P. J. Bray, III-A,-158 Rohn Truell, III-A,-157 P. J. Bray and A. O. Williams, Jr., III-A,-159 California Institute of Technology, Pol Duwez, II-A,-71 California, University of, J. Washburn, II-A,-72 R. R. Hultgren, II-B,-95 Allan W. Searcy, II-B,-96 Earl R. Parker, II-E,-132 J. A. Pask, II-F,-143 Canisius College, Herman A. Szymanski, III-B,-178 Carnegie Institute of Technology, G. Derge, I-E,-55 F. N. Rhines, II-E,-133 C. L. McCabe, II-B,-97 R. Smoluchovski, III-A,-160 Case Institute of Technology, Robert F. Hehemann, I-A,-19 W. M. Baldwin, Jr., I-D,-4 6 Charles S. Smith, II-A,-73 Chicago, University of, Earl A. Long, II-A,-74 Colorado, University of, William F. Love, II-A,-75 Columbia University, George L. Kehl, I-A,-21 Connecticut, University of, Otis R. Gilliam, III-C -190 Cornell University, C. W. Spencer, II-D,-123 Robert H. Silsbee, III-A,-162 196 Florida, University of, Mary Louise Brey, I-D,-47 Flow Corporation, Richard E. Davis, I-B,-32 . (The) Franklin Institute Laboratories for Research and Development, R. L. Smith, II-B,-98 H. G. F. Wilsdorf and I. S. Greenfield, III-A,-163 General Dynamics Corporation, Massoud T. Sinmad, III-C,-191 Georgia Institute of Technology, Willis E. Moody, Jr., II-F,-144 Georgia, University of, William C. Sears, III-B, -179 Hanford Atomics Products Operation, General Electric Company, J. J. Cadwell and J. M. Tobin, III-B,-180 Harvard University, B. Chalmers, II-D,-124 Illinois Institute of Technology, Leonard L. Grossveiner, III-B,-181 Illinois, University of, G. M. Sinclair and C. A. Wert, I-A,-22 J. C. Wheatley and R. I. Hu3sizer, II-A,-76 T. A. Read and D. S. Lieberman, II-A,-77 Paul A. Beck, II-A,-78 Frederick Seitz and David Lazarus, II-B,-99 F. Seitz and J. S. Koehler, III-A,-164 Johns Hopkins University, J. A. Bearden, II-A,-79 Maryland, University of, Homer W. Schamp, Jr., II-A,-80 Massachusetts Institute of Technology, John T. Norton and Robert B. Ogilvie, I-A,-23 David A. Stevenson and John Wulff, I-D,-48 M. B. Bever, B. L. Averbach and M. Cohen, II-A,-81 B. L. Averbach and M. Cohen, II-B,-100 John F. Elliott, II-B,-101 Thomas B. King, II-C,-114 W. A. Backofen and R. L. Fleischer, II-E,-134 Nicholas J. Grant, II-E,-135 197 W. D. Kingery and F. H. Norton, II-F, -145 B. E. Warren, III-A,-165 Materials Research Corporation, Josef Intrater and Sheldon Weinig, II-F,-146 Michigan State University, D. J. Montgomery, II-A,-83 Michigan, University of, David V. Ragone and Edward E. Hucke, II-B,-102 Minnesota, University of, Morris E. Nicholson, II-A,-84 C. C. Hsiao, III-B,-182 Missouri, University of, M. E. Straumanis and W. J. James, I-D,-49 National Bureau of Standards, L. L. Wyman and J. J. Park, I-A,-24 F. P. Knudson, S. Spinner and L. E. Mong, I-C,-38 E. J. Prosen, III-C,-192 National Carbon Company, R. D. Westbrook, R. L. Cumerow, E. Brazis, and R. M. Broudy, I-B,-33 Nebraska, University of, Edgar A. Pearlstein, III-B,-183 New York University, B. R. Sundheim, I-E, -56 Kurt L. Komarek, I-E,-57 North Carolina, University of, Lawrence M. Slifkin, II-B,-103 Northwestern University, John W. Kauffman, III-A,-166 Nuclear Metals, Inc., S. H. Gelles, II-E,-136 E. J. Rapperport, II-E,-137 E. J. Rapperport, II-E,-138 W. L. Lees, III-C,-193 A. Boltax, III-C,-194 Ohio State University, C. H. Shaw and E. R. Jossom, II-A,-85 Oklahoma, University of, W. R. Upthegrove, II-C, -115 Oregon, University of, Wendell M. Graven, I-D,-50 198 Pennsylvania State University, C. R. Kinney and P. L. Walker, J., I-C,-39 Ray Pepinsky, II-E,-139 John A. Sauer, III-B,-184 Pennsylvania, University of, Doris Kuhlmann-Wilsdorf and Robert Maddin, II-A,-86 R. Maddin, II-B,-104 Nev A. Gokcen and Shiro Fujishiro, II-B, -105 Norman Brown, II-E,-140 Pittsburgh, University of, R. S. Craig, II-A,-87 W. E. Wallace, II-B,-106 Purdue University, Richard E. Grace, II-C,-116 H. M. James, III-A,167 Rensselaer Polytechnic Institute, A. A. Burr, D. J. Lam and L. Ianniello, II-A,-88 H. B. Huntington, II-B,-107 E. Brown, III-A,-168 Rutgers University, J. J. Slade, Jr. and S. Weissman, III-A,-169 Stanford Research Institute, Frank A.
Recommended publications
  • Principles of Extractive Metallurgy Lectures Note
    PRINCIPLES OF EXTRACTIVE METALLURGY B.TECH, 3RD SEMESTER LECTURES NOTE BY SAGAR NAYAK DR. KALI CHARAN SABAT DEPARTMENT OF METALLURGICAL AND MATERIALS ENGINEERING PARALA MAHARAJA ENGINEERING COLLEGE, BERHAMPUR DISCLAIMER This document does not claim any originality and cannot be used as a substitute for prescribed textbooks. The information presented here is merely a collection by the author for their respective teaching assignments as an additional tool for the teaching-learning process. Various sources as mentioned at the reference of the document as well as freely available material from internet were consulted for preparing this document. The ownership of the information lies with the respective author or institutions. Further, this document is not intended to be used for commercial purpose and the faculty is not accountable for any issues, legal or otherwise, arising out of use of this document. The committee faculty members make no representations or warranties with respect to the accuracy or completeness of the contents of this document and specifically disclaim any implied warranties of merchantability or fitness for a particular purpose. BPUT SYLLABUS PRINCIPLES OF EXTRACTIVE METALLURGY (3-1-0) MODULE I (14 HOURS) Unit processes in Pyro metallurgy: Calcination and roasting, sintering, smelting, converting, reduction, smelting-reduction, Metallothermic and hydrogen reduction; distillation and other physical and chemical refining methods: Fire refining, Zone refining, Liquation and Cupellation. Small problems related to pyro metallurgy. MODULE II (14 HOURS) Unit processes in Hydrometallurgy: Leaching practice: In situ leaching, Dump and heap leaching, Percolation leaching, Agitation leaching, Purification of leach liquor, Kinetics of Leaching; Bio- leaching: Recovery of metals from Leach liquor by Solvent Extraction, Ion exchange , Precipitation and Cementation process.
    [Show full text]
  • Growth and Characterization of Lif Single-Crystal Fibers by the Micro
    ARTICLE IN PRESS Journal of Crystal Growth 270 (2004) 121–123 Growth and characterization of LiF single-crystal fibers by the micro-pulling-down method A.M.E. Santoa, B.M. Epelbaumb, S.P. Moratoc, N.D. Vieira Jr.a, S.L. Baldochia,* a Instituto de Pesquisas Energeticas! e Nucleares, IPEN-CNEN/SP, Av. Prof. Lineu Prestes, CEP 05508-900, Sao* Paulo, SP, Brazil b Department of Materials Science, University of Erlangen-Nurnberg, D-91058, Erlangen, Germany c LaserTools Tecnologia Ltda., 05379-130,Sao* Paulo, SP, Brazil Accepted 27 May 2004 Available online 20 July 2004 Communicated by G. Muller. Abstract Good optical quality LiF single-crystalline fibers ranging from 0:5to0:8 mm in diameter and 100 mm in length were successfully grown by the micro-pulling-down technique in the resistive mode. A commercial equipment was modified in order to achieve suitable conditions to grow fluoride single-crystalline fibers. r 2004 Elsevier B.V. All rights reserved. PACS: 81.10.Fq; 78.20.Àe Keywords: A2. Micro-pulling-down method; A2. Single crystal growth; B1. Fluorides 1. Introduction oxide single-crystals have already been grown by the laser heated pedestal growth (LHPG) [2] and There is an increasinginterest in the production by the micro-pulling-down (m-PD) [3] methods. of single-crystalline fibers. Their unique properties However, the growth and hence the possible indicate their use for production of a variety of applications of fluoride single-crystalline fibers optical and electronic devices [1]. The final shape has not yet been investigated. of the single-crystalline fiber is already in a form As it is already known from other methods of suitable for optical testingand applications, fluoride growth, these materials are very sensitive reducingthe time and cost of preparation.
    [Show full text]
  • Table of Contents
    Table of Contents Preface ........................................... xi Chapter 1. Physical Extraction Operations .................... 1 1.1. Solid-solid and solid-fluid separation operations .............. 1 1.1.1. Flotation ................................... 1 1.1.2. Settling under gravity ........................... 3 1.1.3. Centrifugation ................................ 3 1.1.4. Filtration ................................... 4 1.2. Separation operations of the components of a fluid phase ........ 5 1.2.1. Condensation ................................ 5 1.2.2. Vacuum distillation ............................. 5 1.2.3. Liquation ................................... 6 1.2.4. Distillation .................................. 8 1.2.5. Extractive distillation ........................... 11 1.3. Bibliography ................................... 12 Chapter 2. Hydrometallurgical Operations .................... 15 2.1. Leaching and precipitation operations .................... 15 2.1.1. Leaching and precipitation reactors ................... 15 2.1.2. Continuous stirred tank reactor (CSTR) ................ 18 2.1.3. Models of leaching and precipitation operations ........... 20 2.1.4. Particle-size distribution (PSD) functions ............... 21 2.2. Reactor models based on particle residence time distribution functions ........................................ 24 2.2.1. Performance equations for a single CSTR ............... 24 2.2.2. Performance equations for multistage CSTRs ............. 28 2.3. Reactor models based on the population balance
    [Show full text]
  • Occurrence and Extraction of Metals MODULE - 6 Chemistry of Elements
    Occurrence and Extraction of Metals MODULE - 6 Chemistry of Elements 16 Notes OCCURRENCE AND EXTRACTION OF METALS Metals and their alloys are extensively used in our day-to-day life. They are used for making machines, railways, motor vehicles, bridges, buildings, agricultural tools, aircrafts, ships etc. Therefore, production of a variety of metals in large quantities is necessary for the economic growth of a country. Only a few metals such as gold, silver, mercury etc. occur in free state in nature. Most of the other metals, however, occur in the earth's crust in the combined form, i.e., as compounds with different anions such as oxides, sulphides, halides etc. In view of this, the study of recovery of metals from their ores is very important. In this lesson, you shall learn about some of the processes of extraction of metals from their ores, called metallurgical processes. OBJECTIVES After reading this lesson, you will be able to : z differentiate between minerals and ores; z recall the occurrence of metals in native form and in combined form as oxides, sulphides, carbonates and chlorides; z list the names and formulae of some common ores of Na, Al, Sn, Pb ,Ti, Fe, Cu, Ag and Zn; z list the occurrence of minerals of different metals in India; z list different steps involved in the extraction of metals; * An alloy is a material consisting of two or more metals, or a metal and a non-metal. For example, brass is an alloy of copper and zinc; steel is an alloy of iron and carbon.
    [Show full text]
  • Hafnium Review Awaiting the Nuclear Renaissance
    Monday, August 17, 2020 Hallgarten & Company Sector Review Christopher Ecclestone [email protected] Hafnium Review Awaiting the Nuclear Renaissance The Hafnium Wannabes Strategy Ticker Market Cap Project Country Developers Australian Strategic Materials Hold ASM.ax AUD$128mn Dubbo Australia Leading Edge Hold LEM.v CAD$21.9mn Norra Karr Sweden Search Minerals Avoid SMY.v CAD$9.3mn Foxtrot Canada Texas Mineral Resources Avoid TMRC US$123mn Round Top USA Hallgarten & Company (44) 795 08 53 621 Monday, August 17, 2020 Hafnium Review Awaiting the Nuclear Renaissance + Hafnium (Hf) has become a metal that is discussed more often, principally as a by-product credit by developers of Rare Earth deposits where it appears as an accessory mineral + Hf is joined at the hip with Zirconium and there is little prospect of developing one without the other, fortunately there is good demand for Zr at current times + The burgeoning construction of nuclear power stations in China promises stronger demand for Hf from its uses in such facilities + The production of HF is currently dominated by the US and France, with China having limited influence (thus far) The Hafnium price has been bouncing along the bottom for years with little sign of recuperation on the horizon Two projects that have cited Hafnium resources, DZP and Silver Fox, are burdened by massive capex (the former) and little prospect of getting to production (the latter) Financing of projects remains very difficult and almost inevitably requires a committed offtaker The Highest of High Tech Usages The metal we shall look at here is obscure even compared to others we have covered in recent times.
    [Show full text]
  • Inorganic Chemistry for Dummies® Published by John Wiley & Sons, Inc
    Inorganic Chemistry Inorganic Chemistry by Michael L. Matson and Alvin W. Orbaek Inorganic Chemistry For Dummies® Published by John Wiley & Sons, Inc. 111 River St. Hoboken, NJ 07030-5774 www.wiley.com Copyright © 2013 by John Wiley & Sons, Inc., Hoboken, New Jersey Published by John Wiley & Sons, Inc., Hoboken, New Jersey Published simultaneously in Canada No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as permitted under Sections 107 or 108 of the 1976 United States Copyright Act, without either the prior written permis- sion of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 646-8600. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, (201) 748-6011, fax (201) 748-6008, or online at http://www.wiley. com/go/permissions. Trademarks: Wiley, the Wiley logo, For Dummies, the Dummies Man logo, A Reference for the Rest of Us!, The Dummies Way, Dummies Daily, The Fun and Easy Way, Dummies.com, Making Everything Easier, and related trade dress are trademarks or registered trademarks of John Wiley & Sons, Inc. and/or its affiliates in the United States and other countries, and may not be used without written permission. All other trade- marks are the property of their respective owners. John Wiley & Sons, Inc., is not associated with any product or vendor mentioned in this book.
    [Show full text]
  • ENVIRONMENTAL CODE of PRACTICE Base Metals Smelters and Refineries
    ENVIRONMENTAL CODE OF PRACTICE C ANADIAN E NVIRONMENTAL P ROTECTION A CT , 1999 First Edition Base Metals Smelters and Refineries March 2006 EPS 1/MM/11 E Metals Section Natural Resource Sectors Pollution Prevention Directorate Environmental Stewardship Branch Environment Canada Library and Archives Canada Cataloguing in Publication Main entry under title: Environmental Code of Practice for Base Metals Smelters and Refineries: Code of Practice, Canadian Environmental Protection Act, 1999. Issued also in French under title: Code de pratiques écologiques pour les fonderies et affineries de métaux communs : Code de pratique de la Loi canadienne sur la protection de l’environnement (1999). “First Edition”. Available also on the Internet. Includes bibliographical references. ISBN 0-662-42221-X Cat. no.: En84-34/2005E EPS 1/MM/11 E 1. Non-ferrous metal industries – Waste disposal – Canada. 2. Non-ferrous metals – Metallurgy – Environmental aspects – Canada. 3. Non-ferrous metals – Refining – Environmental aspects – Canada. 4. Smelting – Environmental aspects – Canada. 5. Best management practices (Pollution prevention) – Canada. i. Canada. Pollution Prevention Directorate. Metals Section. ii. Canada. Environment Canada. TD195.F6E58 2005 669'.028'6 C2005-980316-9 READERS’ COMMENTS Inquiries and comments on this Code of Practice, as well as requests for additional copies of the Code, should be directed to: Metals Section Natural Resources Sectors Division Pollution Prevention Directorate Environmental Stewardship Branch Environment Canada Place Vincent Massey 351 St. Joseph Blvd. Gatineau, Quebec K1A 0H3 Fax (819) 953-5053 Note: Website addresses mentioned in this document may have changed or references cited may have been removed from websites since the publication of the document.
    [Show full text]
  • Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld
    metals Article Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld Kai-Cheng Chen 1, Tai-Cheng Chen 2,3 ID , Ren-Kae Shiue 3 ID and Leu-Wen Tsay 1,* ID 1 Institute of Materials Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan; [email protected] 2 Nuclear Fuels and Materials Division, Institute of Nuclear Energy Research, Taoyuan 32546, Taiwan; [email protected] 3 Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan; [email protected] * Correspondence: [email protected]; Tel.: +886-2-24622192 (ext. 6405) Received: 7 May 2018; Accepted: 25 May 2018; Published: 27 May 2018 Abstract: The main scope of this study investigated the occurrence of liquation cracking in the heat-affected zone (HAZ) of IN738 superalloy weld, IN738 is widely used in gas turbine blades in land-based power plants. Microstructural examinations showed considerable amounts of γ’ uniformly precipitated in the γ matrix. Electron probe microanalysis (EPMA) maps showed the γ-γ’ colonies were rich in Al and Ti, but lean in other alloy elements. Moreover, the metal carbides (MC), fine borides (M3B2 and M5B3), η-Ni3Ti, σ (Cr-Co) and lamellar Ni7Zr2 intermetallic compounds could be found at the interdendritic boundaries. The fracture morphologies and the corresponding EPMA maps confirmed that the liquation cracking in the HAZ of the IN738 superalloy weld resulted from the presence of complex microconstituents at the interdendritic boundaries. Keywords: IN738 superalloy; welding; HAZ cracking; microconstituent 1. Introduction The superior tensile strength, creep and oxidation resistance at elevated temperature make Ni-base superalloys used extensively in industrial gas turbines [1].
    [Show full text]
  • Identifying Materials, Recipes and Choices: Some Suggestions for the Study of Archaeological Cupels
    IDENTIFYING MATERIALS, RECIPES AND CHOICES: SOME SUGGESTIONS FOR THE STUDY OF ARCHAEOLOGICAL CUPELS Marcos Martinón-Torres – UCL Institute of Archaeology, London, United Kingdom Thilo Rehren – UCL Institute of Archaeology, London, United Kingdom Nicolas Thomas – INRAP and Université Paris I, Panthéon-Sorbonne, France Aude Mongiatti– UCL Institute of Archaeology, London, United Kingdom ABSTRACT Used cupels are increasingly identified in archaeological assemblages related to coin minting, alchemy, assaying and goldsmithing across the world. However, notwithstanding some valuable studies, the informative potential of cupellation remains is not always being exploited in full. Here we present a review of past and ongoing research on cupels, involving analytical studies, experiments and historical enquiry, and suggest some strategies for more productive future work. The archaeological case studies discussed are medieval and later assemblages from France (Pymont and Montbéliard) and Austria (Oberstockstall and Kapfenberg), which have been analysed using optical microscopy, SEM-EDS, ED-XRF, WD-EPMA and ICP-AES. Using suitable analytical and data processing methodologies, it is possible to obtain an insight into the metallurgical processes carried out in cupels, and the knowledge and skill of the craftspeople involved. Furthermore, we can also discern the specific raw materials used for manufacturing the cupels themselves, including varying mixtures of bone and wood ash. The variety of cupel-making recipes raises questions as to the versatility of craftspeople and the material properties and performance of different cupels. Can we assess the efficiency of different cupels? Are these variations the results of different technological traditions, saving needs or peculiar perceptions of matter? KEYWORDS Lead, silver, cupellation, fire assay, technological choice, bone ash, wood ash INTRODUCTION Cupellation is a high-temperature oxidising reaction aimed at refining noble metals.
    [Show full text]
  • Lecture 12 Converter Steelmaking Practice & Combined Blowing
    Lecture 12 Converter Steelmaking Practice & combined blowing Contents: Refining of hot metal Composition and temperature during the blow Physico-chemical interactions Developments in Top blown steelmaking practice Concept of bottom stirring in top blowing Top blowing attributes Characteristic feature of converter steelmaking Environmental issues in oxygen steelmaking Causes of high turnover rates of BOF Key words: Top blown steelmaking, combined blowing, bottom stirring, hot metal refining Refining of hot metal After the previous heat is tapped and slag is drained, lining is inspected. Scrap and hot metal are charged. Converter is tilted into the vertical position and the lance is lowered in the vessel to start the blowing. Selection of the starting lance distance is such that the concentration of the force at the bath level should not cause ejection of tiny iron particles (sparking) and at the same time maximum bath surface area is covered by the oxygen jet. The starting lance distance(Xi) for specific oxygen blowing Nm 3 3 rate ton ×min can be calculated by 1.04 Xi = 0.541(db) db is bath diameter in meter. For 150 Tons converter, db = 4.87 m and Xi = 2.8 m, when oxygen flow rate in approximately 450 Nm3/min. Initially oxygen is blown soft by keeping lance distance higher to promote slag formation and to avoid ejection of small particles, because hot metal is not covered by slag. Lime may be added either at the beginning of the blow or in portion during the blow. Oxygen is blown for nearly 15-20 minutes by progressively decreasing the lance distance such that slag foaming remains under control and oxidation reactions occur uninterruptedly.
    [Show full text]
  • Analysis of 999.9 Fine Gold by the Fire Assay Method and Common Sources of Error
    Analysis of 999.9 fine gold by the fire assay method and common sources of error Dippal Manchanda MSc CSci CChem FRSC Technical Director & Chief Assayer The LBMA Assaying & Refining Conference London 2017 Chief Sources of Error The majority of errors in the fire assay operation comes from three sources: 1. Imperfection in even the finest balance. 2. Non-matching matrices i.e. differences in composition between the controlling proof assay sample and the alloy under examination. 3. Variations in temperature in different parts of the cupellation muffle. Other sources of error depend upon the skill of the worker who prepares the cupelled buttons for parting. We will identify these sources of errors and discuss ways to minimise them. The LBMA Assaying & Refining Conference London 2017 Two Pan Mechanical Balance vs Electronic Balance The LBMA Assaying & Refining Conference London 2017 Accuracy vs Weight Test Method Recommendation Why??? Weighing step. 999.9 fine gold - always weigh 500mg in Why 500mg? quadruplicate. Initial Fineness Final wt. (mg) Final Wt. (mg) Fineness Diff. in wt. (ppt.) [of 999.9 fine] [Say 0.01 mg error (ppt.) fineness (mg) occurred due to (+ side} any reason] 100 999.9 99.99 100.000 1000.00 0.1 ppt 250 999.9 249.975 249.985 999.94 0.04 ppt 500 999.9 499.95 499.960 999.92 0.02 ppt Higher the weight, better will be the accuracy The LBMA Assaying & Refining Conference London 2017 Silver to Gold Ratio Literature search reveals Optimum ratio??? Higher the silver content, lower will be the What is the optimum Ag: Au absorption loss during cupellation ratio? 1.
    [Show full text]
  • Refining of Non-Ferrous Metals
    REFINING OF NON-FERROUS METALS J. G. BERRY- Abstract Fundamentals and Examples The fundamentals of refining of non - ferrous How, then, is the objective achieved ? It metals have been outlined . Examples of removal may be achieved by using the affinity of an electrolysis, of impurities by selective oxidation , undesirable element for another element, thus distillation , volatilization , etc., have been given. Refining of copper, lead, zinc, tin, and some other forming a compound, which is insoluble in the metals have been described . The importance of metal to be refined and which can easily be economics and time involved in refining process removed. Selective oxidation, electrolysis, has been stressed, distillation or volatilization may be used, while flotation, magnetic separation or chemi- cal reaction may be used to remove undesir- Introduction able elements prior to the reduction stage. T will be my endeavour in this paper to One of the earliest attempts at refining I indicate the fundamentals of refining would be the ` purification' of gold by as. they are applied to the more common thermal methods, while the most recent members of this group, with a description of development in this field is the solution and some of the processes, and, in doing so, I precipitation of metals under controlled hope to promote discussion which, after all, pressures from ores and concentrates or is the objective of this symposium. scrap, such as brass. In the fire-refining of copper; many im- purities are oxidized and removed in the Definition slag, these impurities being oxidized in pre- What, then, is the definition of ` refining ' ? ference to the copper itself.
    [Show full text]