钛基化学复合镀Ni-P-石墨晶化行为与性能研究

利用化学复合镀技术在钛基表面制备了含有石墨微粒的复合镀层。通过 SEM、XRD、EDS、显微硬度仪和磨损测试等方法对镀后组织性能进行分析,讨论石墨微粒的加入对镀层结构、晶化过程及镀层性能的影响,并与 Ni-P 合金镀层进行对比。结果表明:镀态下镀层是胞粒状堆积形式、属非晶结构,石墨嵌入镀层胞状颗粒中,表面呈现鲜花团集状态;石墨微粒的加入使复合镀层晶化温度升高。晶化完成周期缩短;含有层状石墨微粒的复合镀层大大地提高了钛基表面的耐磨性,热处理后镀层中出现大量的 TiC 硬质增强相,提高了镀层硬度。400℃热处理后硬度达到1239HV0.2,是钛基体的5倍,也高于 Ni-P 合金镀层。

Research on crystallization behavior and properties of Ni-P-Cg composite coating on titanium

Ni-P-Cg coatings were deposited on titanium surface using chemical deposition.The microstructures and properties of coating were analyzed by methods of SEM,XRD,EDS,microhardness instrument and wear test,and the effects of Cg particles on the structure,crystallizing process and properties of coating were studied.Comparison with Ni-P alloy coating was also conducted.The results indicate that the amorphous Ni-P-Cg plating is deposited with cellular structure on the surface.The graphite embeds in cellular,displaying flesh flower status.The onset of crystallization temperature increases due to graphite addition in composite coating and period of completing crystallization is shortened.Due to the appearance of phase TiC in Ni- P-Cg coating after heat treatment,the hardness of coating increases,and after heat treated at 400 ℃,the hardness of composited coating reaches the highest-1 239HV0.2,which is about five times the value of titanium substrate and higher than Ni-P alloy coating also.