Conclusions
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1.
A study was made of the behavior of several solid lubricants under dry sliding friction conditions at nominal loads of up to 60 kg/cm2 and temperatures of up to 400°C. It was established that, in ascending order, these rank as MgF2, ZnS·H2O, CaF2, and BaF2.
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2.
Assessed on the basis of the absolute value of its coefficient of friction and the character of the latter's variation as a function of load and temperature, zinc sulfide is markedly inferior as a solid lubricant to barium and calcium fluorides.
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3.
At 20, 100, and 200°C, the frictional properties of CaF2 and BaF2 are identical, but at 300 and 400°C BaF2 surpasses CaF2 in frictional performance.
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Literature cited
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Translated from Poroshkovaya Metallurgiya, No. 10 (130), pp. 82–86, October, 1973.