【摘要】 用化学沉积法制备Ni-W-P合金镀层。利用扫描电镜(SEM)及X射线衍射(XRD)技术,并结合JADE软件定量分析镀层微观组织特征,研究了退火晶化前后显微组织对镀层耐磨性的影响。结果表明,化学沉积Ni-5.24wt%W-6.71wt%P镀层镀态下的晶化程度约为24%,退火温度升高到700℃时,晶化程度约为94%,未达到完全晶化。在Ni3P相晶化反应温度下,Ni3P相的晶粒尺寸大于Ni相,高于其晶化温度时,Ni相晶粒尺寸大于Ni3P相。退火温度超过600℃时,两相的晶粒尺寸迅速粗化。镀层磨损率随退火温度的升高而减小,500℃时出现最小值,超过500℃时,磨损率又开始增大。镀层较高的耐磨性除了与其硬度有关外,还取决于适当的晶化程度和较小的晶粒尺寸。更多还原

【Abstract】 The Ni-W-P alloy coatings were prepared by electroless plating technique.Microstructure characteristics of the coatings were quantitatively analysed by means of SEM and XRD,and combination with JADE software.Effects of microstructure on wear resistance of the coatings before and after annealing crystallization were studied.The results show that the degree of crystallization of electroless Ni-5.24wt%W-6.71wt%P coating is about 24% in the as plated state,and is about 94% at 700 ℃,but the coating is not completely crystallized.The grain size of Ni3P phase is larger than that of Ni phase at the crystallization reaction temperature of Ni3P phase.When the temperature increases,the grain size of Ni phase is larger than that of Ni3P phase.The grain sizes of the both phases become rapidly coarser when the temperature exceeds 600 ℃.The wear rate of the coating decreases with the increasing of annealing temperature and the lowest value appears at 500 ℃.The annealing temperature above 500 ℃,the wear rate increases.The better wear resistance of the coating depends on proper degree of crystallization and smaller grain size besides effect of hardness.更多还原