球磨冷压烧结制备TNZS基生物材料的摩擦学性能

Tribological Properties of TNZS-based Biomaterials Prepared by Milling,Cold Pressing and Sintering

采用机械高能球磨、常规模压和真空无压烧结相结合的粉末冶金法制备TNZS、TiO_2/TNZS及HA/TNZS 3种钛基生物医用材料,对比研究3种材料的显微硬度及在不同摩擦条件下的摩擦磨损行为。结果表明:TiO_2/TNZS的显微硬度值最高,TNZS、TiO_2/TNZS及HA/TNZS三者的显微硬度值(HV)分别为5254.3、5512.3和4792.7 MPa;在干摩擦条件下,HA/TNZS具有最好的耐磨损性,三者的摩擦系数分别为0.4323、0.5643和0.4338,平均磨痕宽度分别为0.33、0.26和0.18 mm,磨损机理都以磨粒磨损为主,氧化磨损、粘着磨损为辅;三者在人工体液摩擦条件下的摩擦磨损行为都优于干摩擦下的摩擦磨损行为,HA/TNZS的耐磨性优于其它两者,三者的平均摩擦系数分别为0.3309、0.4301和0.3840,平均磨痕宽度分别为0.27、0.19和0.17 mm,磨损机理都以磨粒磨损为主,伴有轻微氧化磨损和粘着磨损。

Ti-24Nb-4Zr-7.9Sn（TNZS）,TiO2/TNZS and HA/TNZS titanium-based biomedical materials were prepared by powder metallurgy combined with high-energy ball milling,conventional vacuum and non-pressure sintering.The microhardness and tribological properties of the three kinds of materials were investigated.The results show that the microhardness（HV） values of TNZS,TiO2/TNZS and HA/TNZS are 5254.3,5512.3 and 4792.7 MPa,respectively,and TiO2/TNZS has the highest microhardness value.Under the condition of room temperature,load of 1N,frequency of 10 Hz,dry friction and Si3N4 ceramic ball for 15 min,HA/TNZS titanium-based biomedical material has the best wear resistance.Friction coefficients of them are 0.4323,0.5643 and 0.4338,respectively and the average width of wear scars are 0.33,0.26 and 0.18 mm,respectively.Their wear mechanism is dominated by abrasive wear with oxidation wear and adhesive wear.The average friction coefficients and wear resistance of all materials under artificial body fluid are better than those under dry friction,and wear resistance of HA/TNZS is better than that of the other two.The average friction coefficients of them are 0.3309,0.4301 and 0.3840,respectively and the average width of wear scars are 0.27,0.19 and 0.17 mm,respectively.Abrasive wear is the dominant wear mechanism,accompanied by mild oxidation wear and adhesive wear.