燃焼合成と爆発衝撃エネルギーを用いたTi-Al-C系複合材の作製とその機械的及び熱的性質

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Fabrication of dense Ti-Al-C system composites by hot-shock consolidation was attempted. Ti(mean particle size:45μm), Al(17μm)and graphite(1-2μm)raw powders were mixed by various molar ratios, and the mixtures tapped into a powder charging container, followed by the self-propagating high temperature synthesis(SHS)reaction. Immediately after, the obtained porous products were densified by underwater-shock consolidation using the detonation of explosive charge. This process was completed in about 20 s. The specimens were characterized by XRD experiments, density measurements, micro Vickers hardness tests, microstructural observations and oxidation resistance tests. As a result, three kinds of intermetallic compounds(TiAl, Ti_2Al and Ti_3Al), and two kinds of ceramics(TiC and Ti_4Al_2C_2)were detected, mainly by the XRD experiments. The main phase detected for the compositions TiC-40mol%TiAl and TiC-60mol%TiAl was the Ti_4Al_2C_2 phase. It is considered that this phase was produced at the high temperature generated by the SHS reaction. Results of its density measurements and micro Vickers hardness tests indicated almost the same tendency as those of the Ti-Al system intermetallic compound. In addition, the microstructural observations revealed that the composites with compositions between TiC-40mol%TiAl and TiC-60mol%TiAl had a needle-like microstructure. The TiC-40mol%TiAl composite showed the highest oxidation resistance among the present specimens. The Ti-Al-C system composites are expected to be novel materials with light weight and excellent heat resistance.
社団法人日本セラミックス協会の論文
1998-07-01

燃焼合成と爆発衝撃エネルギーを用いたTi-Al-C系複合材の作製とその機械的及び熱的性質

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