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Effect of arc–current and spray distance on elastic modulus and fracture toughness of plasma-sprayed chromium oxide coatings

机译：电弧电流和喷涂距离对等离子喷涂氧化铬涂层弹性模量和断裂韧性的影响

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In this experimental study, chromium oxide powder was sprayed on a low-carbon steel substrate using the atmospheric plasma spray process. The current and standoff distances (SODs) were varied to study their effect on the fracture toughness of the coatings. Theoretically, as the arc current increases, the melting of the ceramic oxide should increase and this in turn should lead to the formation of a dense coating. However, it was observed that if the arc power is too high and because the particle size of the powder is small (approximately 30 μm), the particles tend to fly away from the plasma core. Similarly, an appropriate SOD should provide the particles with more melting time, thus resulting in a dense coating. On the other hand, a larger SOD leads to the solidification of the molten particles before the droplets can reach the substrate. All these effects may lead to substantial variation in the fracture toughness of the coating. The present paper attempts to correlate the plasma spraying parameters and microstructure of the coating with the fracture toughness and other primary coating properties.
机译：在本实验研究中，采用大气等离子喷涂工艺将氧化铬粉末喷涂在低碳钢基材上。改变电流距离和隔离距离（SOD），以研究它们对涂层断裂韧性的影响。从理论上讲，随着电弧电流的增加，陶瓷氧化物的熔化应增加，进而应导致致密涂层的形成。然而，观察到，如果电弧功率过高并且由于粉末的粒径小（约30μm），则粒子倾向于飞离等离子体芯。同样，适当的SOD应该为颗粒提供更长的熔化时间，从而形成致密的涂层。另一方面，较大的SOD会导致熔滴固化，然后液滴才能到达基材。所有这些影响都可能导致涂层的断裂韧性发生重大变化。本文试图将等离子喷涂参数和涂层的微观结构与断裂韧性和其他主要涂层性能相关联。

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