陶瓷表面制备铜基金属覆层工艺及结合机理  

Fabricating process and bonding mechanism of Cu-based alloy coatings on ceramic

作　　者：周佳良 舒凤远[1] 姜秋月[2] 赵洪运[1] 贺文雄[1] 

机构地区：[1]哈尔滨工业大学,山东省特种焊接技术重点试验室,威海264209 [2]长春工程学院机电工程学院,长春130012

出　　处：《焊接学报》2018年第6期116-120,共5页Transactions of The China Welding Institution

摘　　要：通过对脉冲式YAG激光器在Al N陶瓷表面制备铜基金属覆层工艺进行优化,调整激光熔覆工艺参数,并进行熔覆前预热和熔覆后缓冷的工艺措施降低陶瓷基体的开裂倾向,引入活性金属钛来提高金属在Al N陶瓷表面的润湿性.结果表明,在陶瓷基体和铜基金属覆层之间形成过渡层,过渡层厚度随着电流的增大而增大,从陶瓷基体到铜基金属覆层,Ti元素含量先增高后降低,O元素含量先增大后减小,Cu,Al,N元素含量均呈现平滑过渡;通过SEM和微区XRD可以发现在激光熔覆过程中,Cu,Ti元素与陶瓷基体之间发生冶金反应,形成TiO_2,Ti_3Al,Cu_4Ti_5,Al_2TiO_3,Ti_2N等冶金产物.The Cu-based metal coating was fabricated on AlN ceramic substrate by pulsed YAG laser and the process was optimized by adjusting laser cladding process parameters. Preheating and slow cooling rate were utilized in the process to reduce the cracking tendency of ceramic substrate. The reactive metal titanium powder was added to enhance wettability of AlN ceramic substrate. The results showed that transition layer appeared between ceramic substrate and Cu-based metal and the thickness of the transition layer increased with the increasing current. The content of titanium increased firstly and then decreased from the ceramic substrate to the Cu-based alloy coating,so did that of oxygen element,while the other elements including Cu,Al and N had presented a smooth trasition. The metallurgical bonding was produced between the ceramic substrate and the cladding powder with different products including TiO_2,Ti_3Al,Cu_4Ti_5,Al_2TiO_5 and Ti_2N.

关 键 词：ALN陶瓷 铜基金属 激光熔覆 过渡层 

分 类 号：TG456.7[金属学及工艺—焊接]