Mo_5Si_3粒子強化Si_3N_4複合材料の作製と摺動特性

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Mo_5Si_3 reinforced silicon nitride composite was fabricated by sintering a Mo-solution infiltrated porous silicon nitride at 1850℃ in N_2 atmosphere;silicon nitride containing solid lubricant particles of MoO_3 at the surface layer was developed by oxidizing a Mo_5Si_3-Si_3N_4 composite at 700℃ in air. The mechanical properties and the tribology behavior of Mo_5Si_3-Si_3N_4 composite were evaluated. It was found that the Mo_5Si_3 dispersed at grain boundary of silicon nitride, the average diameters of Mo_5Si_3 particles being in the range 0.2 to 0.6 μm. The flexural strength of the Mo_5Si_3-Si_3N_4 composite was 881 MPa, which was higher than that of unreinforced silicon nitride by about 20%, because of the Mo_5Si_3 sub-micron particles reinforced the grain boundaries of silicon nitride. The friction coefficient of silicon nitride depended on the stress conditions and the shape of the pin. When increasing the spherical radius of the from 5 to 18 mm, the friction coefficient of the Mo_5Si_3-Si_3N_4 composite decreased and the wear mechanism shifted from adhesive-abrasive wear to a complex type of adhesive-abrasive and abrasive wear mechanism. The formation of MoO_3 on the surface layer of Mo_5Si_3-Si_3N_4 after oxidation treatment lowered the friction coefficient, the friction coefficient of oxidized Mo_5Si_3-Si_3N_4 composite being 0.46 in the dry friction condition. Due to the self-lubricant effect of MoO_3, the friction coefficient of oxidized Mo_5Si_3-Si_3N_4 composite was lower than that of conventional silicon nitride by about 25%.
社団法人日本セラミックス協会の論文
2001-08-01

Mo_5Si_3粒子強化Si_3N_4複合材料の作製と摺動特性

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