The first is the substrate-coating interface, considering the bonding strength, interaction and thermal stress of the substrate and the coating; Second, consider the composition, structure, and properties determined by them, such as hardness, strength, internal stress, fracture toughness, thermal stability, and thermal conductivity. The third is the coating surface, which needs to consider the interaction trend between the coating material and the workpiece and the environment; the fourth is that the matrix material should have certain toughness and hardness.
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