摘要
分别在700、750、800℃条件下对TC4钛合金进行等离子氮氧共渗,研究等离子共渗温度对涂层微观组织结构、表面硬度及耐磨性能的影响规律和作用机制。结果表明:经过等离子氮氧共渗,能够在TC4基体表面形成氧化钛/氮化钛/富Al扩散层结构的多层复合渗层,并且三层组织都会随着反应温度的升高而增厚;等离子氮氧共渗能够将TC4基体的表面硬度由300 HV提高到554 HV,700、750℃下制备的试样摩擦系数显著高于TC4基体,而800℃下制备的试样,初期摩擦系数较低,随后逐渐上升至约0.65,与700、750℃试样基本一致;等离子氮氧共渗能够有效保护基体,提高材料的耐磨性能,并使磨损方式由磨粒磨损变为黏着磨损,并伴有氧化行为。
Plasma oxynitriding of TC4 titanium alloy was conducted at 700,750,and 800℃.The effects of processing temperature on the microstructure,surface hardness,and wear resistance of the coatings were investigated,along with the underlying reaction mechanisms.The results show that a multi-layer composite diffusion structure,consisting of Ti-O,Ti-N,and Al-rich layers,forms on the TC4 substrate after treatment.The thickness of these layers increases with rising temperature.Moreover,plasma oxynitriding enhances the surface hardness of TC4 substrate from 300 HV to 554 HV.The friction coefficients of the co-diffusion layers produced at 700℃and 750℃are notably higher than that of the untreated TC4 substrate.In contrast,the specimen treated at 800℃exhibits a low initial friction coefficient,which subsequently rises to 0.65,showing consistency with the specimens treated at 700℃and 750℃.Overall,plasma oxynitriding effectively protects the substrate,improves the wear resistance of the material,and alters the dominant wear mechanism from abrasive to adhesive wear and oxidation behavior.
作者
高洪宇
黄亚军
陈永强
Gao Hongyu;Huang Yajun;Chen Yongqiang(Military Representative Office of the Navy Armament Department in Shanghai,Shanghai 201206,China;The 9th Military Representative Office of the Navy Armament Department in Shanghai,Shanghai 201206,China)
出处
《钛工业进展》
2025年第6期22-28,共7页
Titanium Industry Progress
关键词
TC4钛合金
等离子氮氧共渗
耐磨涂层
摩擦磨损
TC4 titanium alloy
plasma oxynitriding
wear-resistant coating
friction and wear
