Abstract
The article considers the formation of the third body during dry friction of the nanostructured zirconia crystals partially stabilized with yttria against steel. The assumption is substantiated that the tribological properties of the studied friction pair are determined by the properties of the films formed on the surface of the crystals. Friction tests under sliding conditions were performed according to the “disk-finger” scheme. The results of electron microscopic examination of the friction surfaces of crystals are presented. The elemental composition was determined, and the phase composition of the transfer films of various sections of the crystal friction surface was calculated. At high magnifications, it was found that the friction surface of samples with 2-4 mol.% of Y2O3 has the sufficiently homogeneous structure of the films with traces of boundaries of smaller particles of the transferred material. Destruction of the friction surface of a sample with a Y2O3 content of 8 mol.% occurs at a deeper level and affects not only the layer of secondary structures, but also the underlying layers of the base material.
Highlights
Ceramic materials based on zirconia are characterized by increased crack resistance, have high wear resistance and strength
It has been found that the use of materials of higher purity in the synthesis of zirconium ceramic materials can lead to an improvement in strength at high temperatures
To analyze the interrelation between the parameters of friction and wear of partially stabilized zirconia (PSZ) crystals with their chemical composition and synthesis conditions, it is of interest to study the morphology of friction surfaces and to identify the leading wear mechanisms, such as the destruction of surface layers of samples with different contents of a stabilizing impurity
Summary
Ceramic materials based on zirconia are characterized by increased crack resistance, have high wear resistance and strength. The friction surfaces were studied in terms of chemical composition and mechanical properties. The strength properties of zirconium ceramics are influenced by the anisotropy of mechanical properties. It was found [2] that textured structures will have improved fracture toughness and thermal shock resistance. In paper [4], the mechanical properties of zirconium ceramics were studied when heated to 2000°C. Examination of the surface showed that the mechanical behavior of ceramics under ultrahigh temperature conditions is due to impurities and structural changes [5]. Friction and wear of dental ceramics against natural tooth enamel were studied [7, 8]. It was found that the coefficient of friction of the enamel against polished zirconia or porcelain was greater than with friction against the gold-palladium alloy and less than friction against the glass ceramics
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