Laser remelting of Ni-Cr-Re plasma spraying coating

METAL 2020 Conference Proeedings Pub Date : 2020-01-01 DOI:10.37904/metal.2020.3562

M. Węglowski, J. Dworak, S. Dymek, I. Kalemba-Rec, A. Wrona, K. Kustra, M. Lis

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Abstract

The plasma spray technology allows spraying a wide variety of materials. Atmospheric plasma spraying (APS) consists in injecting a powder feedstock material in a plasma jet to melt and accelerate the injected particles and spray them onto a substrate. The coating growth is thus realized by the impingement and spreading of sprayed particles. This mechanism of coating formation induces the presence of pores and micro-cracks. In order to eliminate those drawbacks, laser remleting may be used to improve the properties and performances of plasma sprayed coatings. In the present paper, the Ni20%C + 20%Re coating fabricated by plasma spraying on stainless steel substrate were remelted by CO 2 laser, and the effect of laser remelting on microstructure and hardness of plasma sprayed Ni20%Cr + 20%Re coating were studied. The microstructure of plasma sprayed and laser remelted coatings were analyzed using scanning election microscopy (SEM) and energy disperse spectroscopy (EDS). The micro-hardness of coating was measured using micro-hardness tester. The results show that the laser remelted coating becomes much denser moreover, the chemical composition of the coatings becomes homogeneous

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Ni-Cr-Re等离子喷涂涂层的激光重熔

等离子喷涂技术可以喷涂各种各样的材料。大气等离子体喷涂(APS)是将粉末原料注入等离子体射流中，使注入的颗粒熔化和加速，并将其喷射到基材上。因此，涂层的生长是通过喷射颗粒的撞击和扩散来实现的。这种涂层形成机制导致了孔隙和微裂纹的存在。为了消除这些缺陷，激光重熔可以用来改善等离子喷涂涂层的性能。采用co2激光对等离子喷涂Ni20%Cr + 20%Re涂层进行了重熔，研究了激光重熔对等离子喷涂Ni20%Cr + 20%Re涂层显微组织和硬度的影响。采用扫描电镜(SEM)和能谱仪(EDS)分析了等离子喷涂和激光重熔涂层的微观结构。采用显微硬度计测定涂层的显微硬度。结果表明，激光重熔后的涂层密度大大提高，镀层的化学成分趋于均匀

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METAL 2020 Conference Proeedings

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