论文部分内容阅读
在AZ31镁合金基体表面采用冷喷涂技术沉积了不同混比的Al/SiO_2涂层,通过扫描电镜(SEM)对涂层的形貌进行观察,发现喷涂粒子之间是通过高速碰撞发生强烈塑性变形而结合在一起的。通过图像处理软件统计了涂层的孔隙率表明,随着SiO_2陶瓷含量的增加,涂层的孔隙率降低,涂层变得致密,不存在贯穿到基体的孔隙,可以有效防止腐蚀介质的渗透。对涂层的显微硬度和摩擦磨损行为的研究结果表明,Al/SiO_2涂层能够较好地沉积在镁合金基体表面,并使镁合金表面的硬度、耐磨性均有明显提高。
Al / SiO 2 coatings with different mixing ratios were deposited on the AZ31 magnesium alloy by cold spraying. The morphology of the coating was observed by scanning electron microscopy (SEM). It was found that the spray particles were strongly plastically deformed by high-speed collision And together. The porosity of the coating was calculated by image processing software. The porosity of the coating decreased with the increase of the content of SiO_2, the coating became dense and there was no pore penetrating into the matrix, which could effectively prevent the infiltration of corrosive media. The results of microhardness and tribological behavior show that the Al / SiO 2 coating can be deposited on the surface of magnesium alloy substrate and the hardness and wear resistance of the magnesium alloy surface are obviously improved.