Ni-P/纳米Al_2O_3复合镀层的制备及其耐磨性能

Synthesis and Wear Resistance of Electroless Ni-P/n-Al_2O_3 Composite Coatings

在化学镀Ni-P合金溶液中加入纳米Al2O3微粒,通过化学沉积法制备Ni-P/纳米Al2O3复合镀层。用扫描电子显微镜(SEM)观察复合镀层的表面形貌,用显微硬度计和平磨机测试Al2O3复合量、热处理等工艺条件对Ni-P/纳米Al2O3复合镀层硬度及耐磨性能的影响。结果表明,复合纳米Al2O3粒子后,Ni-P合金镀层的硬度和耐磨性显著提高,而且随着Al2O3复合量的增大镀层硬度和耐磨性不断增加。当纳米Al2O3复合量为10.1%时,Ni-P/纳米Al2O3复合镀层的硬度较Ni-P增大28%,磨损质量损失减少20%以上。400℃热处理后,复合镀层的硬度由570HV增加到1180HV。

The Ni-P/n-Al2O3 composite coatings are prepared by electroless plating with addition of Al2O3 n-particles in Ni-P electroless bath. The morphology of Ni-P/n-Al2O3 composites is characterized by SEM, and the effects of n-Al2O3 content in deposits and heat-treatment on the hardness and wear resistance of composite coating are investigated with the microhardness tester and the wear machine. The results show that Ni-P/n-Al2O3 composite coating exhibits higher hardness and wear resistance than Ni-P coating. Moreover, the hardness and the wear resistance of composites is increased with the increase of the n-A1203 particle content in composites. Compared with Ni-P coatings, the hardness of Ni-P/n-Al2O3 composite coating is increased by 28 % and the wear loss is decreased by over 20% when the n-Al2O3 particle content in deposit reached 10%. After 400℃ heat-treatment, the hardness of composite coating increased from 570HV to 1180HV.