采用5KW连续CO2激光器对Ni基高温合金上二次重熔NiCoCrAlY和ZrO2陶瓷层进行了研究.结果表明:激光快速熔化和凝固获得定向外延生长、紧密堆积的柱状晶氧化锆陶瓷层.NiCoCrAlY结合层与柱状晶之间存在氧化铝层,保证了柱状晶与NiCoCrAlY层的联结.激光重熔ZrO2层由四方相和立方相组成,经快速冷却由高温保留至室温.
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