脉冲渗氧对工业纯钛表面摩擦磨损性能的影响

Effect of pulse oxidation on friction and wear properties of industrial pure titanium surface

采用脉冲渗氧的方法在不同温度、时间下对工业纯钛进行渗氧处理,以改善其在应用过程中的耐磨损性能。采用X射线衍射仪(XRD)、扫描电镜(SEM)、纳米压痕仪和摩擦磨损试验机分别对试样表层的特征峰强度、形貌特征、压痕硬度、表面摩擦因数及磨痕截面积进行测试。结果表明:经脉冲渗氧处理在工业纯钛试样表面形成氧化层和氧扩渗层;与连续渗氧试样和原始试样相比,700℃脉冲渗氧6 h试样的表面硬度最大,为15.39 GPa,约为同等参数下连续渗氧试样的1.7倍和原始试样的7.3倍;800℃脉冲渗氧4.5 h试样的摩擦因数和磨痕截面积最小,分别为0.24和317.44μm^(2).。试样的黏着磨损被明显削弱,耐磨损性能得到提高。

In order to improve the wear resistance of industrial pure titanium in the process of application,the method of pulse oxidation was used under different temperatures and time.X-ray diffractometer(XRD),scanning electron microscope(SEM),nano indentation tester and friction and wear tester were used to test the characteristic peak strength,morphology characteristics,indentation hardness,surface friction coefficient and wear scar cross-sectional area of the wear mark.The results show that oxidation layer and oxygen diffusion layer form on the surface of industrial pure titanium samples by pulse oxidation.Compared with the continuous oxidation samples and the original samples,the surface hardness of the pulse oxidation sample at 700℃for 6 h is the largest,being 15.39 GPa,which is about 1.7 times of that of the continuous oxidation sample,7.3 times of that of the original sample.The friction coefficient and wear scar cross-section area of the pulse oxidation sample at 800℃for 4.5 h are the smallest,which are 0.24 and 317.44μm^(2),respectively.The adhesive wear of the samples is significantly weakened and the wear resistance is improved.