化学镀镍-磷-纳米SiC-PTFE复合镀层的组织结构与晶化动力学

Microstructure and Crystallization Dynamics of Ni-P-Nano SiC-PTFE Composite Coating Prepared by Electroless Plating

采用扫描电镜、X射线衍射仪、差热分析仪等分析了化学镀镍-磷-纳米SiC-PTFE复合镀层的表面形貌和物相结构,并研究了镀层的晶化动力学。结果表明:纳米SiC、PTFE颗粒均匀地分布于复合镀层中,且SiC颗粒在镀层中发生部分团聚;随热处理温度升高,镀层由镀态下的非晶态出现晶化,并逐渐析出镍、Ni3P以及Ni3Si等晶相;与镍-磷镀层相比,这种含两种颗粒的复合镀层表现出较低的晶化起始温度与较长的晶化时间,且其晶化激活能为268kJ.mol-1。

The surface morphology and phase composition of Ni-P-nano SiC-PTFE composite coating prepared by electroless plating were studied by scanning electron microscopy,x-ray diffraction,diffrential thermal analysis,et al.The crystallization dynamics of the coating was also studied.The results show that the distribution of nano-SiC and PTFE particles was uniform in composite coating,and a few SiC particles agglomeration was found.The structure of coating changed from amorphous to crystal state gradually with the increase of heat treatment temperature,and crystallization phase precipitated,such as Ni,Ni3P and Ni3Si phases.Comparing with the Ni-P coating,the composite coating with two particles showed fairly low crystallization starting temperature and long crystallization time,and the crystallization activation energy of the composite coating was 268 kJ·mol-1.