Preliminary Study on Cavity Characteristics of Cold Sprayed Thickness Coating
In this article, the absence of self-replenishing of cold spray is studied by examining the thick coating deposited around the pre-drilled microsize hole. Thick copper coating was deposited around the microsize holes (about 200 and 500 μm) using cold spraying methods on copper substrate, the cross-section of cavity around the hole were observed with SEM to investigate the characteristics of cavity. Computational methods were also used to investigate the original formation reason of the cavity. The results indicate: the original formation reason of cavity is that particles are too closed when impact onto the substrate. The repellant force between the particles perpendicular to the impaction direction will lead to porosity if the particles are too close. Much lower flatten ratio occurred for succeeding particle if the particles are too close at the same point because the momentum energy convert to the former particles deformation. A high probability of above two phenomenon resulting from high powder feeding rate will form the original cavity. In relative wider cavity, coating can be deposited in the bottom, while in the relative narrow cavity, coating can not be deposited. The thickness of the coating in the cavity is much thinner than coating around the cavity. The cavity grow larger and larger on pre-drilled holes just as the regime effect of cold spray of fixed location deposition.
restoration cold spray copper alloy cavity
Huang Guosheng Li Xiangbo Gu Darning Xing Lukuo
School of Science, Harbin Institute of Technology, Harbin 150001, China Science and Technology on Ma Science and Technology on Marine Corrosion.and Protection Laboratory, Luoyang Ship Material Research School of Science, Harbin Institute of Technology, Harbin 150001, China
国际会议
西安
英文
375-379
2011-05-11（万方平台首次上网日期，不代表论文的发表时间）