热处理对Ni-P-A12O3化学复合镀层摩擦磨损性能的影响

热处理可显著提高镀层的硬度和耐磨性能。采用化学镀的方法在45钢表面制备了Ni-P-纳米A12O3复合镀层，并以不同温度对其热处理，研究了镀层热处理前后的物相、硬度和耐磨性能。结果表明：400℃热处理后，Ni-P-A12O3复合镀层达到稳态，稳定相是Ni＋Ni3P＋NiO＋A12O3；镀层的显微硬度随热处理温度的升高而先...

Effect of Heat Treatment on Wear Resistance of Electroless Ni-P-Al2O3 Composite Coatings

Ni-P-nanometer A1₂O₃ composite coatings were prepared on the surface of 45 steel by electroless plating.As-prepared composite coatings were heat treated under different temperature,and the effect of heat-treatment on the phase structure,microhardness and wear resistance of the composite coatings was investigated.It was found that Ni-P-Al₂O₃ composite coatings reached stabilization after heat-treatment at 400℃,and resultant heat-treated composite coatings consisted of stable phases Ni,Ni₃P,NiO and Al₂O₃.The microhardness of the composite coatings initially rose but declined later on with increasing heat-treatment temperature. Both the microhardness and wear resistance of as-plated and heat-treated composite coatings initially rose but declined later on with increasing content of nanometer Al₂O₃（n-Al₂O₃）.The composite coating obtained from the electroless plating bath containing 2.0 g/L n-Al₂O₃ showed the best microhardenss and wear resistance after heat-treatment at 400℃for 1 h.