Abstract
In this study, atmospheric plasma spray was employed to deposit TiO2–SiAlON ceramic coating on 316 stainless steel. The phases and microstructure of the ceramic coating were investigated. Additionally, comparative studies on the tribological performances of the substrate and the ceramic coating, under both dry and starved lubrication conditions, were carried out. The SiAlON phase was preserved, while partial TiO2 anatase was transformed to rutile phase. The wear rate of the coating was roughly 1/3 of that of the substrate under both conditions. The wear mechanisms of the ceramic coating were surface fracture and abrasive wear in both cases, and the coating under starved lubrication underwent less abrasion. The pores in the coating served as micro-reservoirs, forming an oil layer on the mating surface, and improving tribological properties during sliding.
Highlights
SiAlON ceramics are promising materials with high strength, good oxidation resistance, excellent wear resistance and chemical corrosion resistance [1,2,3,4]
SiAlON ceramics seem to be ideal candidates for high-temperature structural and engineering applications such as cutting tool material, attrition milling arms, wire extrusion dies, roll bearings, etc. [5,6,7] Among them, β–SiAlON ceramics described by the formula Si6–z Alz Oz N8–z, where Z represents the substitution of Z
Sintering is unsuitable for components with complex shapes and large sizes
Summary
SiAlON ceramics are promising materials with high strength, good oxidation resistance, excellent wear resistance and chemical corrosion resistance [1,2,3,4]. Can deposit ceramic coatings on substrate surfaces by spraying melted powders at a high speed using a high-temperature plasma jet [17,18]. For this reason, ceramic coatings deposited by APS have been commonly applied on large metallics or ceramic parts with complex shapes. The main reason for such difficult to deposit properties is the decomposition and sublimation of SiAlON ceramics in the high-temperature plasma. Resistance and wear mechanisms of the ceramic coating were investigated
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