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中文摘要：
利用不同工艺辅助激光熔覆技术制备了Al2O3-TiO2陶瓷涂层,以判断激光熔覆制备陶瓷涂层的可行性.结果表明：利用激光熔覆技术直接制备陶瓷层存在一定难度,陶瓷层裂纹较大,存在剥落现象;采用基底预热辅助激光熔覆法制备的陶瓷层整体脱落,可行性较差;结合冷等静压与高频表面预热技术进行激光熔覆陶瓷层试验,制备的陶瓷层表面光滑平整、无明显微裂纹.采用扫描电子显微镜对熔覆涂层的形貌进行分析.利用高频辅助激光熔覆技术制备的陶瓷涂层表面结构致密,陶瓷层与黏结层之间结合紧密,没有明显的微裂纹和孔隙.根据上述试验方案,分析发现提高粉末密度及降低熔覆过程中的温度梯度可以明显提高陶瓷层的成型性.
英文摘要：
Al2O3-TiO2 coatings were prepared by laser cladding on nickel-based alloy with the assistance of other different technologies.The result shows that there are a lot of cracks and flake phenomenon with the coating by laser cladding,while the whole ceramic coating prepared by laser cladding spalled from substrate preheated.The excellent performance of ceramic coating was achieved by laser cladding with the assistance of high frequency induction sources and isostatic pressing（CIP） technology.Microstructures of the laser sintered samples were characterized by scanning electron microscope（SEM）.The surface of Al2O3-TiO2 ceramic has high compactness and strong bonding strength with no obvious cracks and porous in the interface between ceramic coating and bond coating.According to experiment results,it can be deduced that the increasing of ceramic powders density and the decreasing of temperature gradient in laser cladding process can improve ceramic formability obviously.
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