燃焼合成による微細TiC粒子分散Ti-Al-C三元系複合材の作製と微細組織観察

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Ti-Al-C ternary composites were produced by combustion synthesis using titanium, aluminum and graphite powders. Microstructure observations, X-ray diffraction experiments and micro Vickers hard-ness test were performed for the obtained porous specimens. With low carbon contents, a few intermetallic compounds of titanium and aluminum were obtained. Ti_4Al_2C_2 and TiC phases were produced as the carbon content increased. It is considered that formation of these phases depends on the quantity of heat generated during combustion synthesis. It was suggested that Ti_4Al_2C_2 phase was formed by direct reaction between TiC and Ti-Al system intermetallic compounds. Ti_4Al_2C_2 phase indicated the same hardness value(about 1.5 GPa)as γ-TiAl phase. As the carbon content increased, the hardness value increased remarkably because of dispersion strengthening by TiC particles. The maximum hardness was about 8.6 GPa. Microstructure observations for low carbon contents showed that large TiAl_3 particles were covered with γ-TiAl particles with a grain size of approximately 1 μm. On the other hand, for high carbon contents, it was found that microcomposites which TiC particles with a grain size of approximately 1 μm were dispersed homogeneously in the Ti_4Al_2C_2 phase with rod-like structures. This microcomposite will be expected to have more excellent elevated temperature strength than that of TiAl intermetallic compounds.
社団法人日本セラミックス協会の論文
1996-02-01

燃焼合成による微細TiC粒子分散Ti-Al-C三元系複合材の作製と微細組織観察

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