Silicon nitride (Si
3N
4) matrix composites reinforced with 1.5-8.1mass% Mo
5Si
3 particles were fabricated by sintering molybdenum solution-infiltrated porous Si
3N
4 at 1850°C in nitrogen atmosphere, and the sliding wear and solid particle erosion behaviors of the Mo
5Si
3-Si
3N
4 composites were evaluated. During sliding wear, the formation of an adherent layer on wear scar of Mo
5Si
3-Si
3N
4 composite was inhibited, and the frictional resistance reduced compared with Si
3N
4 due to the self-lubricant effect of the Mo
5Si
3 particle. The friction coefficients of Mo
5Si
3-Si
3N
4 composites were in the range of 0.52-0.58, -6-16% lower than that of Si
3N
4. The specific wear rate of the Mo
5Si
3-Si
3N
4 composite decreased with decreasing content of Mo
5Si
3 particle, and was 0.61×0
-8mm
2/N for the 8.1mass% Mo
5Si
3-Si
3N
4 composite, lower than that of Si
3N
4 by -50%. As for solid particle erosion, when Mo
5Si
3 particles of 2mass% or less were incorporated into Si
3N
4, remarkably better wear resistance than Si
3N
4 was shown. However, when a large fraction of Mo
5Si
3 particle was incorporated, the erosion rate was higher than that of the Si
3N
4, and increased with increasing content of Mo
5Si
3. This was due to the lower values of both fracture toughness and hardness of the composites.
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