Abstract
The results of studies of cavitation resistance of modified ceramics are presented. ZrO2 was inserted into the matrix based on Al2O3 in the amount of 2% by weight. The experiments were carried out under the action of ultrasound, which was generated by oscillations of a magnetostrictive vibrator. The frequency of cavitation effect 22 and 44 kHz was used. The intensity of wear of the specimens was evaluated by the losses of their mass. It was shown that the insertion of ZrO2 into the Al2O3 ceramic matrix increases the resistance of ceramics. The nature of dependencies shows a similar pattern of wear of the specimens. The increase in the content of Al2O3 in the structure of the material and the addition of the small dispersed ZrO2 increases the viscosity of ceramics. The shock waves after the collapse of cavitation bubbles are quenched in ceramics and increased its durability. The process of wearing of ceramics is cyclical. It is accompanied by the separation of the micro-particles. The destruction of the material occurs along the grain boundaries of Al2O3, internal defects, and glass-visible phase. The wear rates are similar for the tested specimens. The cyclical nature of ceramic wear is identical to metal wearing. This allows the use of known approaches for the analysis of results. The study of the rate of mass losses of ceramic specimens demonstrated the similarity with the hydro abrasive wearing of metals.
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Litvinenko, A., Boyko, Y., Pashchenko, B., Sukhenko, Y., Shtefan, E. (2020). Cavitational Wearing of Modified Ceramics. In: Ivanov, V., Pavlenko, I., Liaposhchenko, O., Machado, J., Edl, M. (eds) Advances in Design, Simulation and Manufacturing III. DSMIE 2020. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-50491-5_3
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