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为研究热喷涂工艺对低功率等离子喷涂WC-Co陶瓷涂层的微观组织、相组成和硬度的影响规律,以普通低碳钢Q235A为基体,采用低功率(3~6.6 kW)内送粉等离子喷涂方法,在弧电压恒定、电流增加的条件下,制备不同功率下的涂层.实验结果表明:与传统等离子喷涂WC-Co涂层相比,低功率等离子喷涂WC-Co涂层的显微硬度有所提高,而其脱C率和孔隙率大大降低;涂层中除粉末原有的WC相外,还有喷涂过程中新生成的W2C、Co3W3C和Co3W9C4相.电流增加,涂层中主相WC质量分数降低,而W2C等其他三相的质量分数增多.
In order to study the effect of thermal spraying process on the microstructure, phase composition and hardness of low power plasma sprayed WC-Co ceramic coating, the common low carbon steel Q235A was used as substrate, and the low power (3-6.6 kW) Spray coating method was used to fabricate coatings with different power under the condition of constant arc voltage and current.Experimental results show that the microstructure of the WC-Co coating with low power plasma spraying is lower than that of the conventional plasma spraying WC-Co coating The hardness is improved, and its C removal rate and porosity are greatly reduced. In addition to the original WC phase in the coating, the newly formed W2C, Co3W3C and Co3W9C4 phases in the coating process increase in current, Phase WC mass fraction decreased, while W2C and other three-phase mass fraction increased.