烧结压力对铜基粉末冶金航空刹车材料的影响

The Effect of Sintering Pressures on Cu-based Powder Metallurgy Aircraft Bake Materials

通过粉末冶金的方法制备了铜基粉末冶金摩擦材料,研究了烧结压力(0.5,1.5,2.5,3.5,4.5 MPa)对材料显微组织、致密化的影响以及由此引起的材料摩擦磨损性能和行为的改变。结果表明,烧结压力由0.5 MPa增加到1.5 MPa,材料孔隙度显著减少,材料的摩擦因数明显减小,同时,磨损性能得到显著改善;烧结压力由1.5 MPa提高到2.5 MPa,材料孔隙度进一步降低,但降幅较小,材料磨损性能稍有提高;烧结压力达到2.5 MPa以后,继续提高烧结压力对材料的致密化程度以及摩擦磨损性能影响不大。通过对材料进行组织观察和理论分析,阐述了烧结压力对铜基粉末冶金航空刹车材料影响规律的形成原因。

The composites were produced by powder metallurgy technique. The effect of sintering pressures on the microstructures, density and tribological properties of the composites were studied. The results show that with the increase of sintering pressure from 0. 5 MPa to 1.5 MPa, the density of composites and tribological properties are increased notably, but the friction coefficient of composites are decreased stikingly ; when the sintering pressures are increased from 1.5 MPa to 2. 5 MPa, the density and the tribological properties are increased little;when the sintering pressure reaches 2. 5 MPa,increasing sintering pressure has no effect on the density and tribological properties of the composites. The resultant mechanisms were discussed by observation and analysis of the microstructures of Cu-based friction materials with different sintering pressures.