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宽温域下LaF3对镍基自润滑材料摩擦学性能的影响
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兰州理工大学,材料学院

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Effect of LaF3 on the tribological properties of Ni-based self-lubricating materials in wide temperature range
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    摘要:

    为增强材料在宽温域下服役的稳定性及减少摩擦与磨损对材料性能的影响,采用Ni60合金粉末作为基体材料,利用放电等离子烧结技术(SPS)制备出了不同LaF3含量的镍基自润滑复合材料。利用HT-1000型高温摩擦磨损试验机、GBS-SmartWLI白光干涉三维轮廓仪、SEM、EDS、XRD等对复合材料在大气环境下的宽温域摩擦学性能进行了研究。研究结果表明,所制备的镍基自润滑材料在宽温域下具有优良的摩擦学性能。复合材料摩擦系数与磨损率从200℃到800℃的范围内保持在一个较低水平。当LaF3的含量为6%时,平均摩擦系数在200℃到800℃之间为0.189到0.288且变化范围最小,在600℃下表现最低为0.189,平均磨损率在10-5mm3/N·m数量级,综合表现出最优的摩擦学性能。这是因为LaF3含量为6%的材料在高温下形成了SrSiO3、SrMoO4、La6MoO12等盐类,所形成的盐转移膜一方面防止了对偶材料表面直接接触,另一方面减小了接触薄层的剪切强度,从而显著地提高了宽温域环境下的材料的稳定性。随着测试温度增加到800℃,由于高温氧化作用使得复合材料摩擦系数略微上升,但仍然保持在0.2左右的较低水平。

    Abstract:

    In order to enhance the stability of the materials and reduce the influence of friction and wear on the material properties in the wide temperature range. Ni60 alloy powder was used as the matrix materials, and the composite materials of nickel-based self-lubrication with different LaF3 content were prepared by spark plasma sintering(SPS) technology in this paper. The wide-temperature tribological properties of composite materials in air environment were tested by using HT-1000 high temperature friction and wear tester, GBS-SmartWLI white light interference three-dimensional profiler, SEM, EDS, XRD, etc. Research results indicate that the prepared nickel-based self-lubricating composites have excellent tribological properties in a wide temperature range. When the content of LaF3 is 6%, the average friction coefficient varies from 0.189 to 0.288 ranges in the temperature range from 200°C to 800°C, and the low friction coefficient was showed 0.189 and the average wear rate was on the order of 10-5mm3/N?m at 600℃. SrSiO3, SrMoO4, La6MoO12. were formed at a high temperature of the composite materials with the content of 6%. The direct contact of the surface was prevented by formed salt transfer films and the shear strength of the contact layer was reduced, thereby the stability of the material was improved significantly in a wide temperature range. As the test temperature was increased to 800°C, the friction coefficient of the composite increased slightly due to high temperature oxidations, but remained at a low level of 0.2.

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肖荣振.宽温域下LaF3对镍基自润滑材料摩擦学性能的影响[J].稀有金属材料与工程,2020,49(1):267~273.[肖荣振. Effect of LaF3 on the tribological properties of Ni-based self-lubricating materials in wide temperature range[J]. Rare Metal Materials and Engineering,2020,49(1):267~273.]
DOI:10.12442/j. issn.1002-185X.20181176

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  • 收稿日期:2018-11-23
  • 最后修改日期:2018-12-28
  • 录用日期:2019-02-21
  • 在线发布日期: 2020-02-16
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