Processing of high performance silicon carbide

被引：0

作者：

Hirata, Yoshihiro ^{[1
]}

Matsunaga, Naoki ^{[2
]}

Hidaka, Nobuhiro ^{[1
]}

Tabata, Shuhei ^{[1
]}

Sameshima, Soichiro ^{[1
]}

机构：

[1] Department of Advanced Nanostructured Materials Science and Technology, Kagoshima University, Kagoshima 890-0065

[2] Department of Applied Chemistry and Chemical Engineering, Kagoshima University, Kagoshima 890-0065

来源：

Key Engineering Materials | 2009年 / 403卷

关键词：

Hot-pressing; Liquid phase sintering; Mechanical properties; Microstructure; Polytitanocarbosilane; Silicon carbide;

D O I：

10.4028/3-908454-00-X.165

中图分类号：

学科分类号：

摘要：

Liquid phase sintering based on the dissolution-precipitation mechanism was applied to densify a 0.8 μm SiC powder with alumina (1.2 vol%)-yttria (0.9-3.3 vol%) additives. To uniformly distribute the sintering additives around the SiC particles, a heterocoagulated particle network was formed among negatively charged SiC particles, positively charged 0.2 μm alumina and yttrium ions in an aqueous suspension at pH 5. Yttrium ions were electrostatically adsorbed on the negatively charged SiC surfaces. The consolidated green compacts were highly sintered to 97-99 % of theoretical density by hot-pressing at 1950°C. Four-point strength, fracture toughness and Weibull modulus were highly enhanced when a bimodal particle size system of SiC (75 vol% 0.8 micrometer-25 vol% 30 nanometer SiC) was sintered. The maximum strength reached 1.1 GPa. The fracture toughness was about 6 MPa·m 1/2 and the Weibull modulus was 5.9. When a small amount of SiC precursor polymer was infiltrated in the green compact, the strength and Weibull modulus were further improved.

引用

页码：165 / 168

页数：3

共 13 条

[1]

Omori K., Takei K., J. Am. Ceram. Soc, 65, (1982)

[2]

Lange F.F., J. Mater. Sci, 10, pp. 314-320, (1975)

[3]

Tabata S., Hirata Y., Ceram. Trans, 152, pp. 119-128, (2004)

[4]

Hidaka N., Hirata Y., Ceram. Trans, 152, pp. 109-118, (2004)

[5]

Tabata S., Hirata Y., Sameshima S., Matsunaga N., Ijichi K., J. Ceram. Soc. Japan, 114, pp. 239-244, (2006)

[6]

Hirata Y., Tabata S., Ideue J., J. Am. Ceram. Soc, 86, pp. 5-11, (2003)

[7]

Hidaka N., Hirata Y., Sameshima S., Sueyoshi H., J. Ceram. Proc Res, 5, pp. 331-336, (2004)

[8]

Hidaka N., Hirata Y., Pacific Rim Conference on Ceramic and Glass Technology - Pac Rim 6 (CDR), (2006)

[9]

Matsunaga N., Hidaka N., Sameshima S., Hirata Y., Key Eng. Mater, 352, pp. 73-76, (2007)

[10]

Hidaka N., Hirata Y., J. Ceram. Soc Japan, 113, pp. 466-472, (2005)

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