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Ti-8Si-xZr-yY2O3合金的摩擦磨损性能研究
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江苏大学机械工程学院,江苏大学机械工程学院,江苏大学机械工程学院

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TG146+2

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江苏省科技计划产学研联合创新资金(BY2015064-01)、江苏大学拔尖人才工程基金(1211110001)、江苏省2015年度普通高校研究生实践创新计划(SJLX15-0481)


Friction/Wear Properties of Ti-8Si-xZr-yY2O3 Alloys
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    摘要:

    选用Ti,Si,Zr单质元素和纳米Y2O3粉末高能球磨-冷压烧结制备Ti-8Si、Ti-8Si-0.7Zr、Ti-8Si-1.4Zr和Ti-8Si-1.4Zr-0.1Y2O3(wt%)四种合金。利用SEM和EDS对烧结合金组织与成分进行分析,测试其硬度和摩擦系数、耐磨性等摩擦磨损性能。结果表明:四种配方试样烧结之后主要由Ti5Si3相、Ti(Si)固溶体及Ti(Si、Zr)固溶体组成。Zr及Y2O3是通过改变高硬度的Ti5Si3等物相的含量以及固溶体比例而起到弥散强化或固溶强化效果,改变其显微硬度;Ti-8Si-1.4Zr-0.1Y2O3合金的显微硬度最大,其数值(约1377 HV)比Ti-8Si合金(1020 HV)提高了约35%。Ti-8Si合金(0.365)的摩擦系数最低,但Ti-8Si-1.4Zr(0.504)与Ti-8Si-1.4Zr-0.1Y2O3(0.375)相比,添加0.1wt%Y2O3后摩擦系数降低了约26%。添加Zr元素虽然提高了摩擦系数,但可以降低其磨痕宽度,一定程度上改善Ti-8Si合金的耐磨性;同时,Ti-8Si-1.4Zr-0.1Y2O3合金的磨痕宽度最小,耐磨性最佳,Y2O3能够显著提高合金的耐磨性能。四种合金的磨损都以疲劳磨损为主,伴随着粘着磨损、磨粒磨损和氧化磨损。

    Abstract:

    Ti-8Si, Ti-8Si-0.7Zr, Ti-8Si-1.4Zr and Ti-8Si-1.4Zr-0.1Y2O3(wt%) alloys were preparation by high-energy ball milling, cold-pressure sintering using Ti, Si, Zr and Y2O3 powders. Morphologies and phase composition of sintered samples were analyzing by means of SEM and EDS, and the hardness, friction coefficient and wear resistance of friction/wear properties were investigated. The results show that four kinds of formula samples are mainly containing of Ti5Si3 phase, Ti(Si) solid solution and Ti(Si、Zr) solid solution. Functioned as dispersion strengthening or solid solution strengthening element, the microhardness of the formulas adding Zr and Y2O3 were improved by changing the content of Ti5Si3 and other phases and the proportion of solid solution. The formula of Ti-8Si-1.4Zr-0.1Y2O3 has the highest microhardness(1377 HV), improved by 35% than Ti-8Si(1020 HV). The friction coefficient of Ti-8Si alloy (about 0.365) was minimum, and the friction coefficient of Ti-8Si-1.4Zr-0.1Y2O3 (about 0.375) decreased by 26% than Ti-8Si-1.4Zr(0.504). Zr element decreased the wear width and improved the wear properties, while Zr element increased the friction coefficient. Ti-8Si-1.4Zr-0.1Y2O3 alloy has the best wear resistance with minimum wear width, and significantly improved the wear properties. The wear mechanism of four alloys were mainly fatigue wear, accompanied by adhesive wear, abrasive wear and oxidation wear.

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戈晓岚,韩天,许晓静. Ti-8Si-xZr-yY2O3合金的摩擦磨损性能研究[J].稀有金属材料与工程,2018,47(5):1492~1496.[Ge Xiaolan, HanTian, Xu Xiaojing. Friction/Wear Properties of Ti-8Si-xZr-yY2O3 Alloys[J]. Rare Metal Materials and Engineering,2018,47(5):1492~1496.]
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  • 收稿日期:2016-05-22
  • 最后修改日期:2017-02-20
  • 录用日期:2017-03-16
  • 在线发布日期: 2018-06-08
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