(1. 中南大学 粉末冶金国家重点实验室， 长沙 410083；
2. 株洲钻石切削刀具股份有限公司， 株洲 412007)
摘 要: 采用EPMA、 XRD、 SEM、 TEM、 HRTEM、 EDX、 纳米压痕、 氧化实验和切削实验研究了磁控溅射在硬质合金基体上沉积TiN 涂层和(Ti, Al)N涂层的微观组织结构和性能。 结果表明： TiN涂层晶粒为喇叭口柱状晶， (Ti, Al)N涂层为面心立方平直柱状晶，由于固溶了Al元素， (Ti, A l)N涂层呈(200)面择优生长； (Ti, Al)N涂层在硬质合金基体上无外延生长； (Ti, Al)N涂层在800 ℃氧化后形成Al2O3/TiO2/(Ti, Al)N的分层结构； (Ti, Al)N涂层具有更高的硬度和更好的切削性能。
关键字: (Ti, Al)N涂层； 硬质合金； 外延生长； 氧化性能； 切削性能
(Ti, Al)N coating
（ 1. State Key Laboratory of Powder Metallurgy,
Central South University, Changsha 410083, China;
2. Zhuzhou Cemented Carbide Cutting Tools Co. LTD.,
Zhuzhou 412007, China）
Abstract: The properties of magnetron sputtered TiN and (Ti, Al)N coatings grown on cemented carbide substrates were studied by electron probe microanalysis (EPMA), X-ray diffractometry (XRD), scanning electron microscopy (SEM), nanoindentation, energy dispersive X-ray spectroscopy (EDX), oxidation experiment and cutting tests. The results show that TiN coating is bell mouth columnar structures and (Ti, Al)N coating is fcc straight columnar structures. The (Ti, Al)N coating shows a fairly strong (200) preferred orientation because Ti atoms in the TiN lattice are substituted by Al atoms. The epitaxial growth is not found between (Ti, Al)N coating and substrate. The (Ti, Al)N coating becomes Al2O3/ TiO2/(Ti, Al)N multilayer after oxidated at 800 ℃. The (Ti, Al)N coating exhibits higher hardness, excellent cutting performance compared with TiN coating.
Key words: (Ti, Al)N coating; cemented carbide; epitaxial growth; oxidation properties; cutting properties
