期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 31, 期 3, 页码 744-752出版社
ELSEVIER
DOI: 10.1016/S1003-6326(21)65535-8
关键词
eutectic high entropy alloy; self-lubricating composite; BaF2/CaF2 eutectic powder; tribological properties; microstructure
资金
- National Natural Science Foundation of China [51671217]
By incorporating BaF2/CaF2 eutectic powder, the friction coefficients and wear rates of EHEA composites at high temperatures can be significantly reduced, with the best lubricating performance observed at 600°C with 15% and 20% eutectic powder content.
Eutectic high entropy alloys (EHEAs) have high temperature stability, good mechanical properties, and are promising for tribological applications at high temperatures. To study the high temperature lubrication behavior, Fe22Co26Cr20Ni22Ta10-(BaF2/CaF2)(x) (x=3-20, wt.%) composites were prepared by spark plasma sintering (SPS), with BaF2/CaF2 eutectic powder used as solid lubricant. The lubrication behavior and mechanical properties were studied at both room and high temperatures. With the increase of the content of BaF2/CaF2 eutectic powder, the friction coefficients and the wear rates of the composites at 600 and 800 degrees C decrease significantly. The composites with eutectic powder content of 15 and 20 wt.% have the best lubricating performance at 600 degrees C, with low friction coefficient and wear rates, mainly due to the good mechanical properties of EHEA matrix, the lubrication effect of BaF2/CaF2 phase and the oxides formed on the worn surface.
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