(北京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院， 北京 100022)
摘 要: 采用低碳鋼包覆0～70%TiB2/Al2O3硬質(zhì)相的粉芯絲材和高速電弧噴涂(HVAS)原位合成MMC 涂層， 分析和測試了涂層的組織、 相組成及耐磨粒磨損性能。 結(jié)果表明： 涂層的性能由其組織和相組成決定， HVAS的非平衡制造過程在涂層中形成多種相： 在Fe基固溶體上存在TiB2、 Al2O3、 FexB及少量的金屬間化合物AlFe3和NiAl； 隨著TiB2及Al2O3在涂層中體積分?jǐn)?shù)的增加， 涂層的耐磨粒磨損性能明顯提高， 磨損質(zhì)量損失隨陶瓷相體積分?jǐn)?shù)的增加呈線性減少； 添加合金元素Ni和Al可降低孔隙率， 增加涂層耐磨性。 使用HVAS方法制備了含TiB2的高性能耐磨復(fù)合陶瓷涂層。
關(guān)鍵字: TiB2復(fù)合材料； 高速電弧噴涂； 涂層； 顯微組織； 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
