A comparative analysis of the main types of greases and base oils for their manufacture that are used for lubricating mechanisms operating in space is performed. Their differences in terms of...

An attempt is made to summarize studies of the erosion-corrosion wear fracture of materials, which proceeds by a complex mutually determining mechanism. Parts of submersible pumps and pipelines of nuclear power plants, as well as members of shutoff gate valves, which are subjected to this mode of fracture are considered. Basic methods and test equipment used in the experimental studies are described.

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.

This paper describes friction tests of 3D printing materials in vacuum. The tests were conducted on reciprocally moving samples placed in vacuum at tempera

This article presents a methodology for the study of the relative lifetime of lubricating greases operating in rolling friction. An experimental assembly is described for testing lubricating greases in order to determine the friction coefficient and relative resource. A criterion for assessing the relative resource of lubricating greases has been proposed. The test results of the proposed method were obtained and presented.

This article demonstrates the results of testing a nickel-based coating deposited by plasma spraying. According to the criterion of the relative volumetric wear rate, samples were compared at different concentrations of abrasive, impact angle of 45° and 90°, in an acidic media. A wear of a Ni coating with a steel substrate has been compared.