Cr23C6，CrB / Ni3Al / γ-Ni激光复合涂层研究
Study on Composite Coating of Cr23C6, CrB / Ni3Al / γ-Ni Prepared by Laser Cladding
程广萍1,2, 毕蓉蓉1
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作者单位：1. 安徽工业大学 材料科学与工程学院, 安徽 马鞍山 243002; 2. 安徽省高校金属材料与加工重点实验室, 安徽 马鞍山 243002)
中文关键字：激光熔覆； 金属间化合物； 涂层； Ni3Al
英文关键字：laser cladding; intermetallic; coating; Ni3Al
中文摘要：在低碳钢基底表面激光熔覆Ni60AAA与镍包铝的混合粉，利用扫描电镜、能谱仪以及X射线衍射等分析手段对涂层组织结构进行了分析。结果表明，涂层主要包含γ-Ni、Ni3Al、Cr23C6和CrB相，其中先共晶γ-Ni为主要基体相，呈树枝晶形貌，Ni3Al相也呈树枝晶形貌，游离、均匀分布于涂层；共晶体呈网状分布于两种树枝晶的晶界上；适当提高熔覆功率可以改善涂层的成形性及表面质量，在2.2 kW功率下， Ni60AAA与镍包铝激光合金涂层完整、致密，涂层与基体实现了完全冶金结合。
英文摘要：Composite coating were prepared on mild steel substrate by laser cladding with mixed powder of nickel-base alloy and Ni-coated Al. The microstructure and phase constitution of the coating was studied through SEM, EDX and X-ray diffraction analysis technique. The results show that the composite coating consists of γ-Ni, Ni3Al, Cr23C6 and CrB, with the main matrix γ-Ni solid solution being dendrite and the phase of Ni3Al also being free uniformity dendrite, both of the dendrites surrounded continuously by the eutectic. The formability and surface quality of the composite coating are improved when appropriately increasing the power. Compact and complete coats jointed metallurgically with the steel are obtained on 2.2 kW powers.