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Microstructure and enhanced mechanical properties of WC-Co coatingsobtained by Warm Spraying

机译：温喷涂获得的WC-Co涂层的组织和增强的力学性能

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摘要

WC-Co cermet coatings were fabricated by using Warm Spraying, which is a modification of HVOF spraying to lower the temperature of the propellant gas below the melting point of Co. By changing the processing parameters, specimens were prepared for hardness, abrasion wear and particle erosion tests. Their microstructures were examined by SEM and XRD. The microstructure clearly showed the effects of suppression of the dissolution of WC into the Co phase, which is the major cause of embrittlement of the conventional HVOF sprayed WC-Co coatings. By combinations of adequate feedstock powder and processing parameters, it was possible to take advantage of fine WC grain size to prepare coatings with higher hardness (HV > 1400), smoother surface (Ra < 2 μm), and moderately improved wear performances compared with conventional HVOF coatings.
机译：WC-Co金属陶瓷涂层是通过热喷涂（HVOF喷涂的一种）制成的，该涂层是HVOF喷涂的一种，可将推进剂气体的温度降低到Co的熔点以下。通过更改工艺参数，可以制备硬度，磨损和颗粒的试样侵蚀测试。通过SEM和XRD检查了它们的微观结构。微观结构清楚地表明了抑制WC溶解到Co相中的作用，这是常规HVOF喷涂WC-Co涂层脆化的主要原因。通过结合适当的原料粉末和加工参数，可以利用细小的WC晶粒尺寸来制备具有更高硬度（HV> 1400），光滑表面（Ra <2μm）和与常规相比改善的耐磨性能的涂层HVOF涂料。

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