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作 者:杨宏波[1] 刘朝辉[1] 刘娜[1] 舒心[1] 罗火东 余文威 向玩风
机构地区:[1]后勤工程学院化学与材料工程系 [2]73501部队 [3]湖南省洞口县花园中心小学
出 处:《热加工工艺》2017年第22期130-134,共5页Hot Working Technology
基 金:重庆市研究生科研创新项目(CYS16238);全军后勤科研计划重点项目(BX110C016)
摘 要:采用热化学反应喷涂法在304不锈钢基体表面制备了Al_2O_3非梯度陶瓷涂层(记为1~#涂层)和Ni Cr Al Y/Al_2O_3梯度陶瓷涂层(记为2~#涂层),使用扫描电镜(SEM)、X射线衍射仪(XRD)对该涂层的微观形貌、物相变化进行表征;描述了涂层的高温氧化动力学曲线,对涂层的热震性能进行分析。结果表明,喷涂Al_2O_3陶瓷料浆能有效填补Ni Cr Al Y喷涂层产生的裂纹,涂层与金属基体之间呈冶金结合,α-Al_2O_3和金红石型Ti O_2是陶瓷涂层耐高温的主体晶相结构。2~#涂层表现出最佳的抗高温氧化性能和抗热震性能。Al2O3 non-gradient ceramic coating (marked as 1# coating) and NiCrAlY/Al2O3 gradient ceramic coating (marked as 2# coating) were respectively prepared on the surface of 304 stainless steel by thermal chemical reaction spraying method. The morphology and phase change of the coatings were researched by SEM and XRD. The high temperature oxidation kinetics curves of the coatings were described. The thermal shock resistance of the coating was analyzed. The results show that the spraying of Al2O3 ceramic slurries can fill the cracks appearing in the process of plasma spraying NiCrAlY coatings effectively, and the metallurgical bonding appears between the coating and the metal substrate. α-Al2O3 and rutile TiO2 are the main crystalline phase structure for the high temperature resistance of the ceramic coatings. 2# coating performs the best high temperature oxidation resistance and thermal shock resistance.
关 键 词:热化学反应喷涂法 陶瓷涂层 金属基体 高温氧化 抗热震性能
分 类 号:TG174[金属学及工艺—金属表面处理]
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