冷气动力喷涂技术修复连铸结晶器应用研究进展

Research progress in using cold gas dynamic spraying to repair continuous casting molds

推介了一种全新的结晶器修复技术———冷气动力喷涂技术,介绍了该技术的优势和特点。对结晶器修复用铜、镍和铜—镍涂层的界面以及陶瓷涂层复合涂层的组织结构与力学性能进行了研究。结果表明,铜合金涂层的致密度达到98.7%,铜涂层与铜基板在显微组织上没有明显不同;结合强度和显微硬度(HV0.2)分别为37 MPa和310;铜涂层与镍涂层的界面为曲折波纹状,结合良好;冷喷态镍涂层主要由严重变形颗粒构成,致密度达到98.5%,在900℃下退火1 h发生完全再结晶,显微硬度(HV0.2)仍保持124.1,表明冷喷涂技术是一种具有潜力的结晶器修复技术,并对冷喷涂技术修复连铸结晶器的前景进行了展望。

A new continuous casting mold repairing method—cold gas dynamic spraying（CGDS） is introduced.The advantages and features of this technique are introduced.The microstructures and mechanical properties of the copper and nickel coatings,as well as the copper-nickel coating＇s interface and cramic composite coating,which are usually used in repairing continuous casting molds have been investigated.The experimental results have demonstrated that the relative density of the copper alloy coating is as high as 98.7%,and that no obvious difference can be observed between CrZrCu substrate and Cu alloy coating in terms of microstructures.The bonding strength and microhardness of the Cu alloy coating reach 37 MPa and 310（HV0.2）,respectively.The interface between the copper alloy coating and the nickel coating is either zigzag or wave shaped,and the cohesion is relatively good.As-sprayed nickel coating is dominated by severely deformed particles,and the relative density is up to 98.5%.Complete recrystallization occurred after annealing at 900℃ for 1 h,while its microhardness remains as high as 124.1（HV0.2）.All these results have indicated that CGDS is a promising technology for repairing continuous casting molds and that its future development is prosperous.