铜合金表面热喷涂(焊)涂层组织及性能研究

Study on the Microstructure and Properties of thermal spraying(Welding )Coating on Copper Alloy

采用等离子喷涂工艺在纯铜表面分别制备了NiCrCoAlY、Cr3C2-NiCr两种涂层,采用等离子喷焊工艺制备了Ni60喷焊层,并分别进行了显微形貌、显微硬度、耐磨性能及热震性能分析。结果表明,等离子喷涂层主要为机械咬合,其次是微区冶金结合和化学键结合,而等离子喷焊层与基体形成良好的冶金结合,其结合强度相对较高。Cr3C2-NiCr涂层硬度高达534 HV,耐磨性能最优,而NiCrCoAlY涂层硬度为352 HV,耐磨性能较好,且抗热震性能优异;Ni60焊层熔合区硬度为154 HV,焊层中部高达606 HV,随后缓慢降低至平稳。

Different coatings on the ordinary copper alloy were prepared on the base of main failure modes of the blast furnace tuyere by means of plasma spray welding and plasma spraying technologies in this study. The microscopic morphology,micro-hardness,wear resistance,and thermal shock resistance of the coatings of Ni60,NiCrCoAlY and Cr3C2-NiCr were analyzed. The results showed that the plasma spraying coating are mainly mechanical bond,followed by metallurgical combination and chemical bonds in micro zone. Ni60 coatings can be metallurically bonded to metal substrate and with higher adhesive strength. The microhardness of Cr3C2-NiCr coatings is 534 HV,and the wear resistance is best; Coatings of NiCrCoAlY had the best thermal shock property and the microhardness is 352 HV;For Ni60 coatings,the microhardness of fusion zone is 154 HV,and in the middle of the welding layer the microhardness is as high as 606 HV,after that it decreases slowly.