新型稀土镍铬合金涂层组织与性能研究

Study on Microstructure and Properties of New NiCrY Alloy Coating

在Ni60A合金中添加适量的Cu、Mo、Nb和稀土钇(Y)元素,研制出一种新型稀土镍铬合金(NiCrY)粉体材料。利用SEM、EDS、XRD现代分析技术,对NiCrY合金喷焊涂层的形貌特征、微区成分和物相组成进行分析。结果表明:NiCrY合金涂层由Ni基固溶体基体和Cr23C6、CrB、Ni3B和Cr7C3等硬质相组成,并且组织中有新相MoB析出,硬质相呈细粒状均匀分布于基体上。通过对NiCrY合金喷焊层耐磨和耐蚀性的测定,发现NiCrY较Ni60A合金的耐磨性提高了1倍多,耐蚀性提高了数十倍。分析认为,由于Cu、Mo、Nb和Y的合金化作用,进一步提高了合金的耐磨耐蚀性。

The NiCrY alloy powder was prepared by adding Cu, Mo, Nb and rare earth Y in the Ni60A alloy. The morphology, stmctrue and composition of the NiCrY alloy coating were characterized by SEM, EDS and XRD. The results show that the NiCrY alloy coating consists of Ni-based interstitial and the hard phase of CrzC~, CrB, Ni3B, Cr7C3, and a new hard phase of MoB is also formed in the matrix. The NiCrY alloy coating has a homogeneous fine microstructure and the granular hard phases distribute uniformly. The wear resistance and corrosion resistance test results show that the wear resistance of the NiCrY alloy coating is 1 time higher than Ni60A alloy coating and the corrosion resistance is dozens times higher than Ni60A alloy coating. The alloying effect of Cu, Mo, Nb and Y improves the wear and corrosion resistance of the NiCrY alloy.