Effect of starting phase on microstructure and fracture toughness of hot-pressed silicon carbide

Autor:	Dong-Seok Seo, Jong Kook Lee, Yeon Hwang, Eun-Gu Lee, Jong-Gon Park
Rok vydání:	2002
Předmět:	Materials science Mechanical Engineering Mineralogy Sintering Condensed Matter Physics Microstructure chemistry.chemical_compound Grain growth Fracture toughness chemistry Mechanics of Materials Phase (matter) Volume fraction Silicon carbide General Materials Science Composite material Anisotropy
Zdroj:	Materials Letters. 57:203-208
ISSN:	0167-577X
DOI:	10.1016/s0167-577x(02)00765-6
Popis:	The effect of starting phase of raw material on the microstructure and the fracture toughness of silicon carbide was investigated. The starting phase was adjusted by varying the mixed ratio of α-SiC and β-SiC powders, and they were hot pressed with sintering aids. From the microstructure, some elongated grains were found among equiaxial grains. The anisotropic grain growth was resulted from phase transformation of the β-SiC to the α-SiC with 4H polytype during sintering or heat treatment. Volume fraction, maximum length, and aspect ratio of elongated grains were the highest at 50 vol.% β-SiC in the starting SiC powder, which showed the highest fracture toughness about 6.0 MPa m 1/2.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6b83eb9928be4dc6be05abd6765a2a43 https://doi.org/10.1016/s0167-577x(02)00765-6 Zobrazit plný text záznamu Full Text from ScienceDirect