Si,Ti粉末を同時窒化して作製したセラミックスの寸法変化特性とその断熱エンジン部品への応用

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The development of adiabatic material with low thermal expansion and stable fabrication process of ceramic adiabatic piston head, key component of adiabatic engine, have been required. This time, the influence of some processing parameters on the dimensional change of the reaction sintered ceramics using Si and Ti mixture as starting powders were studied. The results were as follows: (1) The dimensional change ratio incrased as a function of the amount of Ti powder with a change from shrinkage to expansion at about 12 wt% of Ti. And it was clearly shown that expansion of 1.3% occurred during sintering for compacts of Si(70 wt%) and Ti(30 wt%) mixture. On the contrary, shrinkage of 0.08% occurred when only Si was used as a starting powder. (2) The value of dimensional change ratio during dewaxing and sintering were plus and almost constant, independent of the packing density of green body with 30 wt% of Ti. (3) In sintered body, TiN_<0.9> and small amount of TiO_2 in α-, β-Si_3N_4 as matrix, were formed. Based on the results mentioned above, ceramic piston head was experimentally fabricated by sintering at 1400℃ after plugging of Si/Ti mixed powder into sintered Si_3N_4(SSN) frame, and observation and chemical analysis were conducted on the vicinity of the boundary, and followings were found. (4) Almost no gap was found at the boundary of SSN frame and porous ceramics (RBSTN) inside due to the small expansion during sintering. And partially they were bonded. (5) Al, originally one of the elements of SSN, diffused into porous ceramics, which suggested that it might work for bonding SSN and RBSTN.
社団法人日本セラミックス協会の論文
1992-04-01

Si,Ti粉末を同時窒化して作製したセラミックスの寸法変化特性とその断熱エンジン部品への応用

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