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? SPS烧结压力对60NiTi合金显微组织及摩擦学性能的影响
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西安建筑科技大学冶金工程学院

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中图分类号:

TG146.2

基金项目:

国家自然科学基金项目 山西省科技重大专项


Effects of SPS Sintering Pressure on Microstructure and Tribological Properties of 60NiTi Alloy
Author:
Affiliation:

西安建筑科技大学

Fund Project:

The Natural Science Foundation of China Shanxi Major Science and Technological Spacial Project

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    摘要:

    采用放电等离子烧结法在1000 ℃制备60NiTi合金,研究烧结压力对60NiTi合金的显微组织、显微硬度和摩擦学性能的影响规律;采用X射线衍射仪、扫描电镜分析60NiTi合金的显微组织,采用显微硬度仪评价60NiTi合金的显微硬度,通过摩擦磨损试验机研究60NiTi合金摩擦学性能,利用三维白光轮廓仪分析磨痕形貌并计算60NiTi合金的磨损体积,采用扫描电子显微镜分析磨痕表面形貌。试验结果表明:在25MPa烧结压力下,通过放电等离子烧结法制备的60NiTi合金显微组织均匀,主要为NiTi相和Ni3Ti相。随着烧结压力增加,60NiTi合金的显微硬度随之增加,且在50MPa烧结压力时合金的显微硬度达到最大值534 HV0.2kg。60NiTi合金的磨损率和磨痕深度随着烧结压力的增加而减小,60NiTi合金的磨损率和磨痕深度最小值分别为0.76×10-6 mm3/N?m、15 μm,其磨损机制为磨粒磨损与黏着磨损共同作用机制。

    Abstract:

    60NiTi alloys were fabricated by spark plasma sintering (SPS) at 1000 ℃. The effects of the sintering pressure on the microstructure, microhardness and tribological properties of 60NiTi alloys were also investigated. The phase structures and microstructures of 60NiTi alloys were analyzed by X-ray diffractometer (XRD) and scanning electron microscopy (SEM). The microhardness and tribological properties of 60NiTi alloys at different sintering pressure were evaluated by microhardness tester and ball-on-disk wear tester. The wear volumes were calculated by three-dimensional white light profilometer. The wear morphologies of 60NiTi alloys were analyzed by SEM with energy disperse spectroscopy (EDS) and three-dimensional white light profilometer. The experimental results showed that the microstructures of 60NiTi alloy prepared by SPS was uniform and the NiTi phase and Ni3Ti phase were presented in the microstructures. The microhardness of 60NiTi alloys were increased with the increase of the sintering pressure. The microhardness of 60NiTi alloys has the biggest value of 534 HV0.2kg at the sintering pressure of 50MPa. The wear rate and wear scar depth of 60NiTi alloys decreased as the sintering pressure increased. However, when the sintering pressure reached to 50MPa, the wear rate and wear scar depth of 60NiTi alloys are the smallest, which are 0.76×10-6 mm3/N?m and 15 μm, respectively. The wear mechanisms of 60NiTi alloys were abrasive wear and adhesive wear through the wear surfaces analysed by SEM and EDS.

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王伟,程鹏,王成,高原,邹德宁,王快社.? SPS烧结压力对60NiTi合金显微组织及摩擦学性能的影响[J].稀有金属材料与工程,2022,51(10):3793~3801.[Wang Wei, Cheng Peng, Wan Cheng, Gao Yuan, Zou Dening, Wang Kuaishe. Effects of SPS Sintering Pressure on Microstructure and Tribological Properties of 60NiTi Alloy[J]. Rare Metal Materials and Engineering,2022,51(10):3793~3801.]
DOI:10.12442/j. issn.1002-185X.20210729

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  • 收稿日期:2021-08-18
  • 最后修改日期:2022-02-28
  • 录用日期:2022-03-07
  • 在线发布日期: 2022-11-01
  • 出版日期: 2022-10-28