Q235钢基体3Y-TZP/LZAS微晶玻璃梯度涂层冲蚀磨损性能研究

Research on Erosion Wear Resistance of 3Y-TZP/LZAS Glass-ceramic Gradient Coatings on Q235 Steel Substrate

采用涂搪法烧结制备了Q235钢基体3Y-TZP/LZAS微晶玻璃梯度涂层。利用自制的冲蚀磨损试验机,在15°、30°、45°、60°、75°和90°冲蚀角下,控制冲蚀时间,分别对不同层数梯度涂层进行冲蚀,测定体积冲蚀磨损率。通过SEM对冲蚀后的试样表面进行显微结构分析,研究不同冲蚀角度下梯度涂层的冲蚀磨损机制。结果表明:梯度涂层的体积冲蚀磨损率随冲蚀角度增大均呈现出先增大后减小的趋势,并在60°时达到最大值;梯度涂层的抗冲蚀性能随着层数的增加而增强;低角度下的冲蚀机制主要为切削、犁削效应引起的切削磨损,高角度下的冲蚀机制主要为捶击锻打效应引起的脆性断裂,60°冲蚀角下捶击锻打效应和切削、犁削效应都比较强,涂层磨损量最大。

3Y-TZP/LZAS glass-ceramic gradient coatings on Q235 steel substrate were prepared by using enameling and sintering methods. At 15 °, 30 °, 45 °, 60 °, 75 °and 90 ° angles of erosion, the time of erosion was controlled, then erosion test was made on different layers of gradient coatings by using self-made erosion wear tester, the erosion rates of volume were determined. The erosion mechanism of gradient coatings at different erosion angles was researched by microstructure analysis of the sample surface after erosion test by means of SEM. It is shown from the results that the gradient coatings erosion rates of volume increase firstly then decrease as the erosion angle increase, and the maximum is brought at 60 °angle; The erosion wear resistance of gradient coatings increases as the number of layers increase; The main erosion mechanism at low erosion angle is cutting wear caused by cutting and plough cutting effect, and micro-crack fracture caused by pounding and forging effect at high erosion angle, both cutting, plough cutting effect and pounding, forging effect are strong at 60 ° angle, so that the coating wear loss is the largest.