(北京工业大学 材料科学与工程学院， 北京 100022)
摘 要: 采用低碳钢包覆0～70%TiB2/Al2O3硬质相的粉芯丝材和高速电弧喷涂(HVAS)原位合成MMC 涂层， 分析和测试了涂层的组织、 相组成及耐磨粒磨损性能。 结果表明： 涂层的性能由其组织和相组成决定， HVAS的非平衡制造过程在涂层中形成多种相： 在Fe基固溶体上存在TiB2、 Al2O3、 FexB及少量的金属间化合物AlFe3和NiAl； 随着TiB2及Al2O3在涂层中体积分数的增加， 涂层的耐磨粒磨损性能明显提高， 磨损质量损失随陶瓷相体积分数的增加呈线性减少； 添加合金元素Ni和Al可降低孔隙率， 增加涂层耐磨性。 使用HVAS方法制备了含TiB2的高性能耐磨复合陶瓷涂层。
关键字: TiB2复合材料； 高速电弧喷涂； 涂层； 显微组织； 耐磨性
Fe-TiB2/Al2O3 composite ceramic coatings prepared by high velocity arc spraying
（Colledge of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China）
Abstract: High velocity arc spraying(HVAS) was utilized to in-situ deposit a series of comprising TiB2(0～70%TiB2/Al2O3 in cored powder)composite coating on soft steel substrate. The microstructure、 phase characterization and properties of composite coatings were investigated. The results demonstrate that the microstructure and wear performance of composite coatings are influenced by metallurgical transformation during spraying process. As a consequence of non-equilibrium synthesis by HVAS processing, several phases such as TiB2, Al2O3, FexB, AlFe3 and NiAl in Fe matrix form. The anti-friction of composite coatings is improved with increasing ceramic phase content, and the friction mass loss follows a linear rule with ceramic phase volume fraction. TiB2 decomposition results in reduced hardness and wear resistance of the coatings. Coatings with Al, Ni show lower porosity and higher wear resistance. Thus, coatings of high wear resistance with TiB2 phase can be produced using high velocity arc spraying.
Key words: TiB2 composite material; high velocity arc spraying; coatings; microstructure; wear resistance
