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Effect of LaF3 on the tribological properties of Ni-based self-lubricating materials in wide temperature range
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    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. 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.]
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History
  • Received:November 23,2018
  • Revised:December 28,2018
  • Adopted:February 21,2019
  • Online: February 16,2020
  • Published: