摘要
利用DZ—1400型电火花沉积/堆焊机,以工业纯钛TA2为电极,以工业纯氮为保护气和反应气,在TC4钛合金试件表面上制备了TiN/Ti复合涂层。利用X射线衍射仪分析了放电电容、输出电压、脉冲频率对涂层物相的影响,利用MH—6型显微硬度计测定涂层断面不同区域的显微硬度,利用KYKY2800扫描电镜观察涂层组织结构和磨损形貌,采用MS—T3000型球—盘式摩擦磨损试验仪测试涂层的摩擦系数和磨损失重。结果表明,涂层中物相种类随放电电容、输出电压、脉冲频率的不同而变化。涂层组织致密,与基体之间形成冶金结合,涂层显微硬度呈梯度变化,涂层摩擦系数小,耐磨性好。
TiN/Ti composite coating was deposited on TC4 titanium alloy substrate with electric-spark deposition machine modeled DZ-1400,which the commercial pure titanium(TA2) was used for electrode and the commercial pure nitrogen gas was employed as shielding and reacting atmosphere.Effects of the parameters as discharge capacitance,output voltage and impulse frequency on X-ray diffraction(XRD) patterns of TiN /Ti composite coatings were analyzed X-ray diffractometer.The microhardness of coatings was tested with microhardness instrument modeled MH-6.The microstructures and wear morphology were investigated by scanning electronic microscope(SEM).The friction coefficient and wearing capacity lost were tested by ball-pan wear and tear gauge modeled MS-T3000.The results indicated that TiN,a new phase,was synthesized by the element of Ti and N,which come from electrode,substrate and shielding gas respectively and the coatings are mainly composed of Ti and TiN.The XRD patterns were changed with the change of discharge capacitance,output voltage and impulse frequency.An excellent bonding between the coatings and substrates is ensured by the strong metallurgical interface.The highest microhardness of coating reaches to 1 388 HV0.1,which is about six times more than that of the substrates.The friction coefficient of the coatings is small and the wear resistance is excellent.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2008年第10期21-24,共4页
Transactions of The China Welding Institution
基金
河北省自然科学基金资助项目(E2007000566)
关键词
反应电火花沉积
物相
磨损
复合涂层
钛合金
reactive electric-spark deposition
XRD patterns
wear
composite coating
titanium alloy
