α-窒化ケイ素,アルミニウムイソプロポキシド及びチタニウムイソプロポキシドから得たホットプレスβ-サイアロン・TiN焼結体の機械的特性

概要

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β-sialon・TiN composite was fabricated by hot-pressing of a spray-dryed mixture of Si_3N_4 powder, Ti (Oi-Pr)_4 and Al-(Oi- Pr)_3/n- C_6H_<14> solution. Flexural strength, K_<IC>, phase composition and microstructure were investigated. Phases identified by XRD in sintered body were β-sialon, σ sialon and TiN. Reaction of TiO_2 with Si_3N_4 yielded TiN and increased amount of σ sialon compared with samples without Ti(Oi- Pr)_4. The room temperature strength by 3-point bending test was 890 MN/m^2, lower than that (150 MN/m^2) of β-sialon which was made from Si_3N_4 powder and Al(Oi-Pr)_3 solution without Ti (Oi-Pr)_4, but higher than that (740 MN/m^2) of β-sialon・TiN made from Si_3N_4, Al_2O_3 and TiO_2 powders. The improved strength is due to the finer and more homogeneous microstructure. The lower strength compared with β-sialon without Ti(Oi-Pr)_4 was ascribed to the rough surface formed by heat-treatment in air. The Vickers hardness of β-sialon・TiN was about 17 GN/m^2 and the K_<IC> was about 4 MNm^<-3/2>, both slightly higher than those of β-sialon without Ti ( Oi- Pr)_4. The improvement is probably due to the existence of TiN grains.
社団法人日本セラミックス協会の論文
1988-07-01