Thermal spray wear resistant coatings include a variety of ceramic. Great material choices in a number of applications. No doubt. Just not under these circumstances, and here’s why.
Ceramic is brittle by nature. Depending on wear mechanism, it (they) can chip, crack, even form fine powders, at or below the surface. Unlike metals or plastics under high contact stress, ceramics cannot undergo plastic deformation. Not in any measurable sense. As a result, ceramic coatings fracture under stress.
Unfortunately, even under extreme temperatures, ductility remains insignificant. The brittle condition remains largely unchanged. Not only are ceramic coatings vulnerable to higher stress, but in circumstances where there is a tensile component, too. This makes them poor candidates for abrasive wear. Being without a low elastic modulus, you see.
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