等离子喷涂WC-12Co涂层抗冲刷磨损行为

目的探索WC-12Co复合涂层抗冲刷磨损的能力。方法采用大气等离子喷涂(APS)方法在Q235钢基体上制备WC-12Co复合涂层。用扫描电镜(SEM)、X射线衍射仪(XRD)和能谱仪(EDS),对涂层微观形貌和相组成及成分进行分析。采用维氏显微硬度计表征了涂层的力学性能。采用自制的干砂型常温冲刷磨损试验机对涂层进行冲刷磨损实验。结果所制备的涂层主要由WC以及少量的W2C、Co3W3C和Co6W6C相组成。涂层以机械结合方式为主,同时伴有微冶金结合。截面显微硬度高于粘结层,其截面平均显微硬度为1169HV0.05。WC-12Co涂层厚度为300μm,粘结层厚度为50μm。在冲刷角为60°时涂层失重率最大,为0.4788 mg/g;在30°时涂层失重率最小,为0.3696 mg/g。结论在小角度30°冲刷时,具有较好的抗塑性冲刷磨损能力;在冲刷角为60°时出现最大的冲刷失重率,抗冲刷磨损效果较差;在大角度90°时,有一定的抗脆性冲刷磨损性能。

Erosion Wear Behavior of WC-12Co Coatings Prepared by APS

To study the erosion wear resistance of WC-12Co composite coatings. in this paper,WC-12Co composite coat-ings was prepared on Q235 steel substrate by atmospheric plasma spraying (APS) method. The microstructure, phase composi-tion and erosion wear behavior of the obtained coatings were studied by using a variety of analytical techniques, such as XRD, SEM, EDS and self-made dry sand erosion wear tester. The mechanical properties of the coating were characterized by the Viv-torinox microhardness tester. showed that the coatings was mainly composed of WC, and a small amount of W2C, Co3W3C and Co6W6C phase. The coatings was about 300 μm thick,the bonding coatings was about 50 μm thick, and the cross-sectional mi-crohardness was 1169HV0.05at a load of 0.5 N. The maximum mass loss of the coating is 0.4788 mg/g at 60 degrees, and the minimum mass loss of the coating is about 0.3696 mg/g at 30 degrees. the wear loss firstly increase then decrease with the growth of the erosion angle, and amounted to the maximum value when the erosion angle was 60°. The coatings mainly sub-jected to plastic wear at the small angle (30°) while it subjected to brittle one at the large angle (90°).