CuCo2Be表面等离子喷涂制备Cr3C2-NiCr/NiAl复合涂层成形机理及界面扩散研究

Study on Formation Mechanism about the Cr3C2-NiCr/NiAl Coating of CuCo2Be Alloy by Plasma Spraying

摘要:

选用等离子喷涂技术在CuCo2Be合金表面制备Cr3C2-NiCr/NiAl复合涂层。选用DTA、XRD、SEM、EDS等分析手段探讨Cr3C2-NiCr/NiAl复合涂层的形成机理及其组成涂层的化合物、物相的形成特点及规律。结果表明：DTA分析发现镍铝打底层在热喷涂过程中由于系放热反应，可能生成Ni2Al3、NiAl3、NiAl等物相；SEM、EDS分析发现复合涂层组织呈现明显的层状，在镍铝打底层中镍铝化合物为角状；XRD分析发现涂层物相在成形的不同阶段和时间内其生成的化合物类型、数量都呈现不同的变化。利用XRD、EDS分析界面处各相的生成及元素的分布、扩散情况，表明在界面处存在一定的元素扩散，界面为微冶金结合。

Abstract:

Cr3C2-NiCr/NiAl coating on the CuCo2Be alloy was prepared by plasma spraying. The formation mechanism, phase composition in the Cr3C2-NiCr/NiAl coating and the phase characteristics were analyzed by DTA, XRD, SEM, EDS etc. The DTA analysis shows that in thermal spray process, Ni2Al3, NiAl3, NiAl phase may be generated for the exothermic reaction. SEM, EDS analysis results showed that the coating displays an obviously layered structure and nickel-aluminum compounds exhibit a angular. XRD analysis shows that the compounds of the coating conformed exhibit different changes and types in the different forming stages and time. The phase formation at the interface and the distribution of elements were investigated by XRD, EDS, it is shown that a certain element diffusion appears?in the boundary, So the interface has the micro-metallurgical bonding.