β-サイアロンーSiC及びSi_3N_4-SiC加圧焼結体の熱膨張係数 中村 浩 梅林 正気 岸 和司 社団法人日本セラミックス協会 日本セラミックス協会学術論文誌 : Nippon Seramikkusu Kyokai gakujutsu ronbunshi 09145400 97 1131 1412 1415 1989-11-01 The powders of a-Si_3N_4, a-Al_2O_3 and ain were mixed to fabricate β-sialon (formula Si_<6-z>Al_zO_zN_<8-z> with 4 excess oxygen eq. % over Z =1, 2, 3 and 4). A SiC powder was added to the β-sialon powder mixture and hot-pressed to get β-sialon-SiC composites. A powder mixture of a-Si_3N_4, 5 wt% Y_2O_3, 2wt% a-Al_2O_3 and 50 wt% SiC was hot-pressed under the same conditions to get a Si_3N_4-50 wt% SiC composite material. Thermal expansion data of the sintered material was measured from 25 to 1000 ℃ by dilatometric method. The results are obtained as follows: -(1) The thermal expansion coefficient of the β-sialon-SiC composites gradually increased with an increase in SiC addition up to 30 wt%. (2) The thermal expansion coefficient of β-sialon-50 wt% SiC composites gradually increased with an increase of Z value. (3) The thermal expansion coefficient of Si_3N_4-50% SiC composite was 3.18X10^<-6>/ ℃. This value was a little higher than Si_3N_4 sintered material but lower than that of SiC sintered material. 1989-11-01 110002290871 AN10040326 3258812 JPN CJPref NDL NII-ELS Journal@rchive 3 1 Thermal Expansion Coefficient of Hot-Pressed β-sialon-SiC and Si_3N_4-SiC Composites NAKAMURA Hiroshi UMEBAYASHI Seiki KISHI Kazushl The Ceramic Society of Japan Journal of the Ceramic Society of Japan The powders of a-Si_3N_4, a-Al_2O_3 and ain were mixed to fabricate β-sialon (formula Si_<6-z>Al_zO_zN_<8-z> with 4 excess oxygen eq. % over Z =1, 2, 3 and 4). A SiC powder was added to the β-sialon powder mixture and hot-pressed to get β-sialon-SiC composites. A powder mixture of a-Si_3N_4, 5 wt% Y_2O_3, 2wt% a-Al_2O_3 and 50 wt% SiC was hot-pressed under the same conditions to get a Si_3N_4-50 wt% SiC composite material. Thermal expansion data of the sintered material was measured from 25 to 1000 ℃ by dilatometric method. The results are obtained as follows: -(1) The thermal expansion coefficient of the β-sialon-SiC composites gradually increased with an increase in SiC addition up to 30 wt%. (2) The thermal expansion coefficient of β-sialon-50 wt% SiC composites gradually increased with an increase of Z value. (3) The thermal expansion coefficient of Si_3N_4-50% SiC composite was 3.18X10^<-6>/ ℃. This value was a little higher than Si_3N_4 sintered material but lower than that of SiC sintered material. 中村 浩 NAKAMURA Hiroshi 三井鉱山(株)中央研究所 Mitsui Mining Co., Ltd.. Research and Development Centre 梅林 正気 UMEBAYASHI Seiki 九州工業技術試験所 Government Industrial Research Institute Kyushu 岸 和司 KISHI Kazushl 九州工業技術試験所 Government Industrial Research Institute Kyushu