喷涂距离对等离子喷涂WC-12Co涂层抗冲蚀磨损性能的影响

为提高WC-12Co涂层抗冲蚀磨损性能,在Q235钢基体上采用大气等离子喷涂(APS)方法制备WC-12Co涂层,研究了喷涂距离对粒子温度与速度、涂层组织结构、力学性能及抗冲蚀磨损性能的影响。结果表明:喷涂距离对涂层质量影响较为明显,喷涂距离为130 mm时涂层质量较好,粒子速度与温度达到较好的配合,涂层抗冲蚀磨损能力较强。喷涂距离为120 mm与140 mm时涂层抗冲蚀磨损能力较差。550μm(30目)沙粒直径对涂层冲蚀磨损量大,沙粒速度为15.68 m/s比13.33 m/s沙粒速度冲蚀磨损量大;冲蚀角为60°时冲蚀磨损量最大,30°冲蚀磨损量最小。

Effects of Spraying Distance on Erosion Wear Behavior of WC-12Co Coatings Prepared by APS

In order to improve the erosion resistance of coatings. WC-12Co composite coatings were prepared on Q235 steel by atmospheric plasma spraying (APS) method. The microstructure, mechanical properties and erosion resistance of the coatings under different spraying distance were studied. The results show that the spraying distance has an obvious influence on coating preformance. When the spraying distance is 130 mm, the particle velocity and temperature matches well, and the quality and erosion resistance of the coatings are better than others. The corrosion resistance of the coatings sprayed by 120 mm and 140 mm is poor . The wear mass loss of the coating is the largest when the diameter of sand is 30 mesh. When the velocity of sand is 15.68 m/s, the wear mass loss of the coatings is larger than that of 13.33 m/s.The wear loss firstly increases, then decreases with the growth of the erosion angle, and attains the maximum value when the erosion angle is 60°.