氟塑钢复合管冲蚀磨损性能的试验研究

通过实验研究适用于电厂余热深度回收的新型氟塑钢复合管的冲蚀磨损性能，主要考察在刚玉砂和煤灰两种颗粒冲蚀下，气流速度、温度与颗粒质量浓度等对复合管中低速气流冲蚀磨损的影响.通过扫描电子显微镜对冲蚀磨损后的表面微观形貌进行观察，初步探讨冲蚀磨损机制.结果表明，在中低速度下，复合管的冲蚀磨损速率随气流速度的变化呈幂函数关系；在两种不同颗粒的冲蚀下，复合管的冲蚀磨损速率随颗粒质量浓度的变化均近似呈线性关系；复合管的冲蚀磨损速率随气流温度的升高而降低，但变化幅度不大；微观形貌分析显示，复合管表面受到颗粒反复垂直冲击时主要发生塑性变形，局部出现显微裂纹，在受到颗粒的反复斜向冲击时主要发生切削和犁耕.
Abstract: Experiments were conducted to analyze the erosion wear behavior of tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) coated the stainless steel tube, which was applied in the waste heat recovery deeply in power plant. The influences of the velocity and temperature of air and the particle mass concentration on the erosion behavior were analyzed at medium-low speed of PFA coated stainless steel tube under two kinds of particles, namely corundum sand and coal ash. The mechanism of erosion wear was discussed by observing the surface morphologies through scanning electron microscope. Experimental results show a good power function relationship between erosion rates of PFA coated stainless steel tube and the velocity of air with the velocity at medium-low speed ranges. The erosion rates are approximately proportional to the particle mass concentration under two kinds of particles. The erosion rates decrease as the temperature of air increases with a comparatively lower variation. The morphologies show that the surface of PFA coated stainless steel tube mainly happens plastic deformation and microcrack locally with particle impacting vertically, and happens cutting together with ploughing with particle impacting obliquely.