Hafnium Carbide, Chemical Formula Is Hfc, the Relative Atomic Weight Is

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What is hafnium carbide? Hafnium carbide, chemical formula is HfC, the relative atomic weight is 190.5, theoretical carbon content is 6.30%, with high chemical stability and good high temperature properties. Density is 12.7g / cm3, melting point is 3890 ℃, belonging to the highest bidder single compound melting point as we known . Volume resistivity is 1.95 × 10-4Ω · cm (2900 ℃), the thermal expansion coefficient is 6.73 × 10-6 / ℃. Usually we use hafnium oxide (HfO2) and carbon to make composite powder, the reaction temperature is 1900 ~ 2300 ℃, hafnium carbide with some metal carbides form a solid solution, such as : hafnium carbide ZrC, tantalum carbide TaC, etc. It has a high melting point and high elastic modulus, good electric conductivity, low thermal expansion and good impact properties. Because hafnium carbide has HfC hardness and high melting point, it can be used for hard alloy additives. 4TaC·HfC melting point is about 4215 ℃, it was the highest melting point compound as we known. HfC frontier protective layer of hafnium carbide alloy can be used for rocket nozzles and re-entry gliding aircraft, 4TaC · HfC alloy tool steel can manufacture resistence material. English name: Hafnium carbide English alias: Hafnium carbide (HfC); [1] Hafnium carbide; Hafnium - methane (1:1) CAS: 12069-85-1 EINECS:235-114-1 Formula: HfC Molecular weight: 194.5325 Changsha Langfeng Metallic Material Ltd. is specialized in production of hafnium carbide powder, and an integral forming of production, development, sales, services and related solutions , if you want to know more information about hafnium carbide, please pay attention to our official website products link: http://www.langfengmetallic.com/powder/hafnium-carbide-powder.html.

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Hfc STRUCTURAL FOAMS SYNTHESIZED from POLYMER PRECURSORS
HfC STRUCTURAL FOAMS SYNTHESIZED FROM POLYMER PRECURSORS Except where reference is made to the work of others, the work described in this dissertation is my own or was done in collaboration with my advisory committee. This dissertation does not include proprietary or classified information. ________________________________________ Haibo Fan Certificate of Approval: ______________________________ _____________________________ ZhongYang Cheng Bryan A. Chin, Chair Assistant Professor Professor Materials Engineering Materials Engineering ______________________________ ______________________________ Dong-Joo Kim William C. Neely Assistant Professor Professor Materials Engineering Chemistry and Biochemistry ___________________ Stephen L. McFarland Dean Graduate School HfC STRUCTURAL FOAMS SYNTHESIZED FROM POLYMER PRECURSORS Haibo Fan A Dissertation Submitted to the Graduate Faculty of Auburn University in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy Auburn, Alabama December 16, 2005 HfC STRUCTURAL FOAMS SYNTHESIZED FROM POLYMER PRECURSORS Haibo Fan Permission is granted to Auburn University to make copies of this dissertation at its discretion, upon request of individuals or institutions and at their expense. The author reserves all publication rights. ______________________________ Signature of Author ______________________________ Date iii VITA Haibo Fan, son of Chaoying Fan and Yulan Shi, was born on November 18, 1976, in Ugrat Front Banner, Inner-Mongolia, the People’s Republic of China. He graduated from Ugrat Front Banner No.1 High School in 1994. He studied at Tianjin University for four years and graduated with a Bachelor of Engineering degree in Mechanical Engineering in July 1998. He entered Auburn University in August 2000 to pursue his M.S. and Ph.D. degrees in Materials Engineering. He received his M.S. degree in May 2003.
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