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作 者:李亚娟[1] 董允[2] 王志平[1] 柳士强[3]
机构地区:[1]中国民航大学理学院,天津300300 [2]东北大学秦皇岛分校材料科学与工程系,秦皇岛006604 [3]河北工业大学材料科学与工程学院,天津300130
出 处:《焊接学报》2013年第1期37-40,115,共4页Transactions of The China Welding Institution
基 金:国家自然科学基金资助项目(60879018)
摘 要:采用等离子喷涂工艺在镍基高温合金基体上制备了热障涂层(底层为MCrA-lY,面层为ZrO2+8%Y2O3),通过控制高真空烧结炉的氧分压对涂层进行预氧化处理,分析了预氧化处理对热障涂层热冲击性能和涂层应力状态的影响.结果表明,预氧化处理提高了粘接层的致密度,涂层组织变得均质化,降低了粘结层由于凸起尖角产生复杂应力的概率;有效干预热生长氧化物(TGO)的生长过程,降低了TGO的生长速度;热障涂层残余应力随热冲击次数的增加而增大,但经过预氧化处理的涂层应力增长幅度较缓慢,经过400次热冲击后的残余应力为492.5 MPa,未经过预氧化处理涂层热冲击350次后应力值为650.1 MPa.The thermal barrier coating by taking MCrAlY as bonding coating and ZrO2+8%Y2O3 as top coating were deposited on the nickel-based super-alloy by air plasma spraying.Pre-oxidation treatment was carried out on the thermal barrier coatings by controlling the oxygen pressure in high vacuum sintering furnace.Then,the effects of pre-oxidation treatment on the thermal shock resistance and residual stress were investigated,respectively.The results show that pre-oxidation treatment improves the density of bonding coating,which makes it uniform and reduces the probability of complex stress caused by convex point in interface area.Meanwhile,pre-oxidation treatment interferes the growth process of thermally grown oxide(TGO),reduces the TGO growth rate and the stress concentration of coating.Residual stress increases with the increasing of thermal cycles.However,pre-oxidation treatment can slow down the increasing rate of residual stress.The residual stress of 650.1 MPa can be reached after 350 thermal cycles without pre-oxidation,while the residual stress is only 492.5 MPa after 400 thermal cycles with pre-oxidation.
分 类 号:TG162.83[金属学及工艺—热处理]
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