Al含量对TiAlN涂层的组织和抗氧化性能的影响

来源期刊：上海金属2010年第3期

论文作者：陈佳荣 朱丽慧 倪旺阳 刘一雄

文章页码：11 - 14

关键词：(Ti_1-xAl_x)N涂层； Al含量； 组织结构； 抗氧化性

Key words：(Ti_1-xAl_x)N Coatings； Al Content； Structure； Oxidation Resistance

摘    要：采用阴极电弧蒸发镀在WC-Co硬质合金基体表面沉积两种不同Al含量的(Ti_1-xAl_x)N涂层,比较了(Ti_0.4Al_0.6)N涂层和(Ti_0.55Al_0.45)N涂层的组织和抗氧化性能。结果表明:两种涂层的主要相都是呈NaCl型面心立方结构的TiN。(Ti_0.4Al_0.6)N涂层晶格常数较小,固溶强化作用较大,具有较高的硬度。与(Ti_0.55Al_0.45)N涂层相比,(Ti_0.4Al_0.6)N涂层900℃氧化后增重较少。XRD和SEM分析结果表明氧化后TiAlN涂层会形成Al₂O₃和TiO₂氧化物,且Al₂O₃对涂层中TiO₂析出有抑制作用,氧化后Al含量较高的(Ti_0.4Al_0.6)N涂层的Al₂O₃和TiO₂含量较低,表面的氧化物颗粒尺寸也较小。(Ti_0.4Al_0.6)N涂层抗氧化性能优于(Ti_0.55Al_0.45)N涂层。

Abstract: (Ti_1-xAl_x)N coatings with two different Al contents were deposited on the WC-Co cemented carbides substrate by cathode arc evaporation,the microstructure and oxidation-resistance property of(Ti_0.4Al_0.6)N and(Ti_0.55Al_0.45)N were compared.The results showed that the major phases of the two coatings were TiN,which had cubic fcc structure of NaCl type.(Ti_0.4Al_0.6)N coating had smaller lattice parameter,larger lattice deformation and higher micro-hardness.Compared with (Ti_0.55Al_0.45)N,(Ti_0.4A1_0.6)N coating had less weight-gain after oxidized in air at 900℃.XRD and SEM results indicated the formation of Al₂O₃ and TiO₂ in the oxidized coatings.Since the formation of TiO₂ could be restrained by A1₂O₃,there were less and smaller A1₂O₃ and TiO₂ in(Ti_0.4Al_0.6)N coating than that in(Ti_0.55Al_0.45)N coating.(Ti_0.4Al_0.6)N coating had better oxidation resistance than (Ti_0.55Al_0.45)N coating.