Al_2O_3颗粒镀铜对铜基粉末冶金摩擦材料Al_2O_3-Fe-Sn-C/Cu摩擦磨损性能的影响

通过对陶瓷摩擦组元的表面进行化学镀铜来改善铜基粉末冶金摩擦材料中陶瓷相与基体间的结合效果,从而提高材料摩擦磨损性能。分别采用镀铜Al2O3颗粒和未镀铜Al2O3颗粒与铜粉和铁粉等经混合、压制、加压烧结制备Al2O3-Fe-Sn-C/Cu摩擦磨损试样。测试并分析了摩擦材料的微观结构、力学性能及摩擦磨损性能。结果表明:摩擦组元镀铜可使硬质颗粒与铜基体结合紧密;摩擦材料的布氏硬度增加了12%,弹性模量提高了约7%,摩擦系数提高了5%~10%,线磨损量降低了20%~50%;表面镀铜后的Al2O3颗粒不易脱落,摩擦系数稳定性提高了13%~23%。研究结果表明,摩擦组元表面镀铜可提高材料的综合性能。

Effects of Cu-plating for Al2O3 particles on friction and wear properties of Cu-based powder metallurgy friction material Al2O3-Fe-Sn-C/Cu

The surface of ceramic friction component was copper plated chemically to improve the combination situation between ceramic phase and matrix of the copper-based powder metallurgy friction materials, thus the friction and wear properties of the materials were improved. Cu-plated Al₂O₃ particles and non-Cu-plated Al₂O₃ particles were adopted respectively, friction and wear specimens of Al₂O₃-Fe-Sn-C/Cu were fabricated by mixing, pressing and pressure sintering with copper powder, iron powder and so on. The microstructures, mechanical properties, friction and wear properties of friction materials were measured and analyzed. Results show that the copper-plating of friction components makes the combination between hard particles and copper matrix tight. The Brinell hardness of friction material is improved by 12%, the elastic modulus is improved by about 7%, the friction coefficient is increased by 5%-10%, and the linear wear loss is reduced by 20%-50%. In addition, Al₂O₃ particles plated with copper on the surface are difficult to fall off, and the friction coefficient stability is increased by 13%-23%. Therefore, the overall performance of the materials can be improved by copper-plating on the surface of friction component.