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采用等离子喷涂工艺在H13热作模具钢表面制备了WC-12Co涂层,通过SEM、EDS和XRD等手段分析了试样表面-界面形貌、面能谱和物相组成,并通过磨损试验考察了其摩擦性能。结果表明,WC-12Co涂层主要成分是WC硬质相,均匀分布在涂层中,没有出现富集现象,具有良好的硬度和耐磨性能;在喷涂过程中没出现W_3O,涂层具有较好的抗氧化能力;涂层厚度约为400μm,结合界面为机械结合+局部微冶金结合方式;WC-12Co涂层其摩擦系数约为0.399,表现出良好的减摩性能和抗磨损能力;磨痕处化学元素分布较为均匀,在周期性碾压力作用下涂层在片状衔接部位结合力较弱处诱发裂纹,出现WC和Co开裂的失效现象。
WC-12Co coating was prepared on the surface of H13 hot work tooling by plasma spraying. The surface morphology, surface morphology and phase composition were analyzed by SEM, EDS and XRD. The friction performance. The results show that WC-12Co coating is the main component of WC hard phase, uniformly distributed in the coating, there is no enrichment phenomenon, with good hardness and wear resistance; no W_3O in the spraying process, the coating has more Good anti-oxidation ability; the coating thickness is about 400μm, the bonding interface is mechanical bonding + local micro-metallurgical bonding mode; the friction coefficient of WC-12Co coating is about 0.399, showing good anti-friction performance and anti- The distribution of chemical elements in the marks is more uniform. The cracks are induced by the weak bonding force at the interface of the flake joints under the action of the periodic grinding force, resulting in the failure of WC and Co cracking.