Oxidation mechanism of Mo5Si3 particle in Si3N4 matrix composite at 750 °C

Iizuka, Tateoki; Kita, Hideki

doi:10.1016/j.msea.2003.09.056

Cited by 11 publications

(1 citation statement)

References 30 publications

(45 reference statements)

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“…However, the first sudden increase of the friction coefficient was observed after the region of slowly increasing friction coefficient. It is obvious that a low‐friction resistance layer, which decreased the friction resistance, occurred on the surface of the composite, and the effect of that low‐friction layer continued to a sliding distance of ∼600–800 m. After oxidation treatment, MoO 3 particles surrounded by the amorphous silica formed and resided at the grain boundary junctions on the surface of the composites 11 . The decreased friction coefficient of the oxidized Mo 5 Si 3 –Si 3 N 4 composite resulted from the influence of the solid‐lubricant MoO 3 particles.…”

Section: Resultsmentioning

confidence: 99%

Tribological Behavior of Mo₅Si₃‐Particle‐Reinforced Silicon Nitride Composites

Iizuka

Kita

2004

Journal of the American Ceramic Society

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The tribological behavior of Mo 5 Si 3 -particle-reinforced silicon nitride (Si 3 N 4 ) composites was investigated by pin-on-plate wear testing under dry conditions. The friction coefficient of the Mo 5 Si 3 -Si 3 N 4 composites and Si 3 N 4 essentially decreased slowly with the sliding distance, but showed sudden increase for several times during the wear testing. The average friction coefficient of the Si 3 N 4 decreased with the incorporation of submicrometer-sized Mo 5 Si 3 particles and also as the content of Mo 5 Si 3 particles increased. When the Mo 5 Si 3 -Si 3 N 4 composites were oxidized at 7001C in air, solid-lubricant MoO 3 particles were generated on the surface layer. Oxidized Mo 5 Si 3 -Si 3 N 4 composites showed self-lubricating behavior, and the average friction coefficient and wear rate of the oxidized 2.8 wt% Mo 5 Si 3 -Si 3 N 4 composite were 0.43 and 0.72 Â 10 À5 mm 3 (N . m) À1 , respectively. Both values were B30% lower than those for the Si 3 N 4 tested in an identical manner. J ournal

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Section: Resultsmentioning

confidence: 99%