Development of wear-resistant composite material based on multifunctional ceramics for plasma spraying in air
Keywords:
composite ceramic material, plasma spraying, oxide ceramics, wear resistance, corrosion resistanceAbstract
This paper presents a technology for producing a composite ceramic material. Oxide ceramic powders were prepared by agglomeration of a fine-dispersed powder mixture followed by high-temperature sintering of the following compositions: Al2O3 - Cr2O3 - 15 % (MoS2–Ni), Al2O3 - Cr2O3 - 15 % (CaF2 - Ni), and Al2O3 - Cr2O3 - 15 % (graphite - Ni). The structure of the developed powders provides the basis for producing wear-resistant coatings with high performance under corrosive wear conditions. Granulation was carried out for 3–3.5 h, followed by spheroidization in an argon atmosphere using a 50-kW plasma torch. The resulting composite ceramic material exhibits high processability, maintains its chemical composition during plasma spraying, and enables the formation of coatings with high wear resistance and a low coefficient of friction. Coatings produced from Al2O3 - 25 % TiO2 - 25 % Cr2O3 - 12.5 % MoS2 and Al2O3 - 25 % TiO2 - 25 % Cr2O3 -12.5 % CaF2 powders exhibited wear resistance 1.8 times higher under lubricated friction conditions and 1.7 times higher under dry friction in a corrosive environment than coatings produced from the conventional Al2O3 - 30 % TiO2 - 12.5 % MoS2 powder.
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