激光熔覆AlN/TiAl制备Ti-Al-N复合涂层及其摩擦性能研究  

Preparation of Ti-Al-N composite coating by laser cladding AlN/TiAl and study of its wear performance

作　　者：黄飞龙 肖华强[1] 林波[1] 莫太骞 HUANG Feilong;XIAO Huaqiang;LIN Bo;MO Taiqian(College of Mechanical Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学机械工程学院,贵阳550025

出　　处：《激光技术》2025年第2期188-194,共7页Laser Technology

基　　金：国家自然科学基金资助项目(52065009);贵州省科技计划资助项目(黔科合基础-ZK[2022]一般204)。

摘　　要：为了制备耐磨钛基涂层,采用激光熔覆技术在TC4表面制备了Ti-Al-N涂层,对不同激光功率下涂层的物相组成、组织演变、硬度进行观察分析,再对复合涂层在空气环境中的摩擦学性能进行分析。结果表明,涂层增强相主要由Ti_(2)AlN,TiN,TiAl及Ti_(x)Al_(y)等组成,各物相衍射峰强度随激光功率的增加而改变,基体相则由(γ-TiAl+α_(2)-Ti_(3)Al)组成;涂层与基体冶金结合,随着激光功率的增加,组织由弥散分布的柱状晶逐渐变成粗大树枝晶,但在2.4 kW功率时,组织又变得细小;复合涂层的显微硬度可以达到基体的2.14倍;在空气摩擦环境中,不同试样均以磨粒磨损为主,其中基体磨损严重;不同激光功率下的涂层均大幅度提高了基体的耐磨性,涂层中有增强相的存在,涂层的最小磨损率为0.786×10^(-4) mm^(3)·N^(-1)·min^(-1),基体为1.34×10^(-4) mm^(3)·N^(-1)·min^(-1);通过控制激光功率可以调节涂层性能。这一研究可以对激光熔覆制备高耐磨钛基复合涂层在航天、海工设备中的应用提供基础支持。In order to prepare wear-resistant titanium-based coating,a Ti-Al-N wear-resistant titanium-based coating was prepared on TC4 surface by laser cladding.The phase composition,microstructure evolution and hardness of the coating under different laser powers were observed and analyzed,and then the tribological properties of the composite coating in the air environment were analyzed.The results show that the strengthening phase of the coating is mainly composed of Ti_(2)AlN,TiN,TiAl and Ti_(x)All_(y).The diffraction peak intensity of each phase changes with the increase of laser power,and the matrix phase is composed of(γ-TiAl+α_(2)-Ti_(3)Al).The coating is metallurgically bonded to the substrate.With the increase of laser power,the microstructure gradually changes from dispersed columnar crystals to coarse dendrites,but when the laser power was 2.4 kW,the microstructure becomes fine again.The microhardness of the composite coating can reach 2.14 times that of the substrate.In the air friction environment,different samples are mainly abrasive wear,and the matrix wear is serious.The coatings under different laser powers greatly improve the wear resistance of the substrate.The minimum wear rate of the coating was 0.786×10^(-4) mm^(3)·N^(-1)·min^(-1),and the matrix was 1.34×10^(-4) mm^(3)·N^(-1)·min^(-1).Therefore,the coating performance can be adjusted by controlling the laser power,which provides basic support for the application of laser cladding high wear-resistant titanium-based composite coatings in aerospace and marine equipment.

关 键 词：激光技术 钛合金 激光熔覆 Ti-Al-N复合涂层 干摩擦磨损 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG665[金属学及工艺—金属学]