Abstract
We compared two modes of magnetron sputter deposition of MoS2 on substrates made of steel AISI 316L and bronze CuAl9NiFe4Mn1 with different initial roughness Ra 0.05–2.32 µm. The deposition was carried out at a bias voltage of −20 and +100 V, and the deposition rate of these modes differed by 30%. Measurements of the friction coefficient and lifetime tests were made in accordance with ASTM G133. Measurements of the friction coefficient and lifetime tests in vacuum at load 7H, temperature of samples 250 °C, and pressure in the chamber <10−6 Pa were carried out according to ASTM G133. The adhesive strength, the chemical composition of the coatings before and after tribological tests, the degree of crystallinity of the coatings, and the distance between the planes were evaluated. Mechanical and structural properties of coatings are discussed concerning the deposition mode parameters. The average coefficient of friction of the MoS2 coatings in steady-state friction did not exceed 0.051 for all samples. The influence of the sample pretreatment method on the growth of molybdenum disulfide crystals was revealed.
Highlights
Samples with roughness outside the specified range have higher friction coefficient values than those falling within this range, which is consistent with the results of Gradt et al For coatings deposited on bronze substrates, sample B1 (Ra 0.06) in the steady state has the friction coefficient 1.2–1.4 times higher than that of B2 and B3
Tribological tests of antifriction coatings based on molybdenum disulfide, intended for operation in a vacuum at elevated temperatures
Magnetron deposition modes that differ in bias voltage (−20 or +100 V), with all other parameters fixed, do not affect the mechanical properties and structure of the antifriction coating (AFC)
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Molybdenum disulfide MoS2 is the most commonly used solid lubricant. Like liquid ones such as oils and greases, solid lubricants create a continuous lubricating film on the surfaces of the tribo-interface bodies in order to reduce friction and wear in a dry environment. Solid lubricants are used under conditions where oils and greases prove to be ineffective, e.g., at high or cryogenic temperatures, in vacuum, under radiation, or at high contact pressures [1,2,3]
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