Ni-P-金刚石复合镀层的等温晶化动力学研究

采用金刚石作为复合粒子制备了Ni-P-金刚石复合镀层，通过引入晶化方式指数的概念，研究了Ni-P镀层和Ni-P-金刚石复合镀层的等温晶化过程的形核和长大动力学。结果表明，在相同温度下，Ni-P-金刚石复合镀层开始晶化所需时间比Ni-P镀层的少，但其晶化过程进行较为缓慢，完成晶化所需时间较长。说明金刚石的存在有利于晶化过程的开始，但对晶化的进行过程又有阻碍作用。Ni-P-金刚石复合镀层与Ni-P镀层两者的晶化机制是一样的，Ni-P-金刚石复合镀层的晶化方式指数为2．87，Ni-P镀层晶化方式指数为2．91。

Study on Isothermal Crystallization Kinetics of Ni-P-Diamond Composite Coating

Electroless Ni-P diamond composite coating was deposited using diamond compound particle. By introducing the concept of Avrami exponent nucleation and growth kinetics of Ni-P and Ni-P-D coatings were researched during isothermal crystallization process. The results show that the crystallization beginning time of Ni-P-D composite coating is less than that of Ni-P coating at the same temperature,but its crystallization process and holding time are longer, which means the diamond in the coating can benefit crystallization beginning but hinder the process of crystallization. The crystallization principles of Ni-P-D and Ni-P coatings are identical, the Avrami exponent of Ni-P-D coating is 2.87, and that of Ni-P coating is 2.91.