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超音速激光沉积技术(SLD)将激光技术与冷喷涂技术相结合,在保持冷喷涂固态沉积的优势下,极大地拓展了单一冷喷涂技术的可喷涂材料范围。采用超音速激光沉积技术制备了单一冷喷涂难以制备的WC/Stellite 6金属基复合涂层(MMC),并与激光熔覆(LC)涂层在宏观形貌、显微组织、界面稀释、未熔WC占比、涂层抗裂纹扩展性能等方面进行对比研究。研究表明:具有固态沉积特点的超音速激光沉积涂层避免了热加工过程中的WC分解与溶解问题,在采用相同比例的WC/Stellite 6复合材料情况下,超音速激光沉积涂层中WC体积占比为27.6%,高于激光熔覆层的3.7%;激光熔覆层稀释率约为8.9%,而超音速激光沉积涂层无宏观稀释区;大载荷压痕测试结果显示激光熔覆涂层压痕处出现大量放射状裂纹而超音速激光沉积涂层无裂纹出现,表明超音速激光沉积涂层抗裂纹扩展能力优于激光熔覆涂层。
Supersonic Laser Deposition (SLD) The combination of laser technology and cold spray technology greatly expands the range of sprayable materials for a single cold spray technology, while maintaining the advantages of cold spray solid deposition. The WC / Stellite 6 metal matrix composite coating (MMC), which is hard to be prepared by single cold spraying, was prepared by supersonic laser deposition. The microstructure, interface dilution and laser cladding (LC) Melting WC proportion, coating anti-crack expansion performance and other aspects of comparative study. The results show that the supersonic laser deposition coating with solid deposition features avoids the problem of WC decomposition and dissolution in the hot working process. In the same proportion of WC / Stellite 6 composite material, the volume of WC in the supersonic laser deposition coating Accounting for 27.6%, higher than the laser cladding layer 3.7%; laser cladding layer dilution rate of about 8.9%, while the supersonic laser deposition coating without macroscopic dilution zone; large load indentation test results show that laser cladding There was a large number of radial cracks in the laminations and no crack appeared in the supersonic laser deposition coatings, indicating that supersonic laser deposition coatings have better crack growth resistance than laser cladding coatings.