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为了研究激光重熔对等离子喷涂层组织性能的影响,对Cr_3C_2-NiCrBSi等离子喷涂层进行了激光重熔,且对重熔区进行了显微组织观察,EDM分析以及显微硬度测量,高能量密度的激光束能对Cr_3C_2-NiCrBSi等离子喷涂层进行重熔, 重熔层呈现细小的树枝状铬碳化物组织, 并且具有较高的显微硬度,利用IROS系统、能得到较宽的、熔深一致且稀释较小的高硬度重熔层。在重熔区内能观察到少量空洞及缩孔,为了减少这些缺陷,须认真控制等离子喷涂过程以便于减少气孔及限制元素氧化。
In order to study the effect of laser remelting on the microstructure and properties of plasma sprayed coatings, laser remelting was carried out on the plasma sprayed coatings of Cr_3C_2-NiCrBSi, and the microstructure, EDM and microhardness of the remelted zone were measured. The high energy density Laser beam can remelt the Cr 3 C 2 -NiCrBSi plasma sprayed coating. The remelted layer shows a fine dendritic chrome carbide structure and has a high microhardness. With the IROS system, a wide and deep penetration can be obtained And dilute the smaller high-hardness remelting layer. In the reflow zone can be observed in a small amount of voids and shrinkage, in order to reduce these defects, the need to carefully control the plasma spraying process in order to reduce the pores and limit the elemental oxidation.