Sintering Property of Green Compacts of Si and TiC Mixed Powders in Nitrogen

Autor:	Samuel S. Shinozaki, Yoshiyuki Yasutomi, Masahisa Sobue, J. Hangas
Rok vydání:	1991
Předmět:	Titanium carbide Materials science Metallurgy Composite number chemistry.chemical_element Sintering General Chemistry Condensed Matter Physics Nitrogen chemistry.chemical_compound chemistry Materials Chemistry Ceramics and Composites Porosity Tin Carbon Powder mixture
Zdroj:	Journal of the Ceramic Society of Japan. 99:692-698
ISSN:	1882-1022 0914-5400
Popis:	The sintering property of powder mixture compacts of TiC and Si in a nitrogen atmosphere at 1350°C is discussed. TiC formed TiN and free carbon on reaction with nitrogen, and a small portion of this free carbon was converted into β-SiC on reaction with Si. A large portion of the Si formed Si3N4 on reacton with nitrogen. Approximately half of the TiC remained unreacted when heated for 10h at the final sintering temperature of 1350°C. Thus, composite ceramics having a composition of TiC⋅TiN⋅Si3N4⋅C⋅β-SiC were obtained. The porosity of this composite was much smaller than that of ordinary Si3N4 bonded ceramics because of the volume increase caused by the conversion of Si to Si3N4 and additionally of TiC to TiN, C and β-SiC. Carbon, in particular, seemed to have a remarkable effect on reducing the number of pores in the sintered body. The sample dimensions increased in the sintering stage partly because TiC particles formed porous clusters of TiN by reacting with nitrogen.
Databáze:	OpenAIRE
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