液相脉冲放电制备Ti(C,N)多元陶瓷涂层

Preparation of the Ti(C,N) Multi-components Ceramic Coating by Electrical Discharge Coating in Liquid

TiN类涂层目前主要采用物理气相沉积方法进行制备,本文提出了一种TiN类涂层的低成本制备方法,该方法将Ti块体材料作为工具电极置入乙醇胺液相介质中,通过液相脉冲放电涂层技术在45钢表面制备出Ti(C,N)陶瓷多元涂层。对涂层组织形貌、物相结构等进行了分析。结果表明,所制备的陶瓷涂层厚度约为20μm,主要物相为Ti(C0.3,N0.7);涂层表面显微硬度可达1 780HV以上,涂层表面有不规则的放射状突起边缘。透射电镜分析结果表明,涂层晶粒尺寸均匀细小,选区花样谱图揭示了涂层等轴晶粒具有晶体学上的随机取向,晶体结构为面心立方。

Currently, series of TiN coatings are mainly prepared by the method of physical vapor deposition （PVD）, while this paper proposes a low cost preparation method about TiN coating. In this method, the Ti smelting electrode was used as the tool electrode which was immersed in ethanolamine liquid solution, then the Ti （C, N） ceramic coating was deposited on the 45 steel workpiece surface by electrical discharge coating（EDC） in liquid. The phase composition and surface morphology structure of the coating were analyzed. The results show that the thickness of the prepared coating is about 20 μm, the hardness of the coating is more than 1 780 HV, the main phase of the coating is Ti（C0.3 ,N0.7 ） and it appears an irregular and radial edge appears on the surface and sedimentary layers with a certain amount of protuberances. Transmission electron microscope （TEM） results show that the grain size of equiaxed grains formed on the coating surface is very uniform. The selected area electron diffraction（SAED）patterns show that the equiaxed grains of the coating have the random orientation on the crystallography. The structure of the coating is face centered cubic （FCC） structure.