钛合金热障涂层高温氧化和热循环性能  

High-temperature oxidation and thermal cycling properties of thermal barrier coating on titanium alloy

作　　者：刘静[1,2] 梁加淼[1,2] 孙靖[3] 杨天豪 王俊 Liu Jing;Liang Jiamiao;Sun Jing;Yang Tianhao;Wang Jun(Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming,Shanghai Jiao Tong University,Shanghai 200240,China;School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Aerospace Equipments Manufacturer Co.,Ltd.,Shanghai 200245,China)

机构地区：[1]上海交通大学上海市先进高温材料及其精密成形重点实验室,上海200240 [2]上海交通大学材料科学与工程学院,上海200240 [3]上海航天设备制造总厂有限公司,上海200245

出　　处：《材料与冶金学报》2022年第5期350-357,共8页Journal of Materials and Metallurgy

基　　金：国家自然科学基金面上项目(51971143).

摘　　要：分别采用超音速火焰喷涂和大气等离子喷涂工艺,在高温钛合金基体上制备出由Ti-48Al-2Cr-2Nb粘结层和8YSZ陶瓷面层组成的热障涂层.对这两种涂层进行高温静态氧化和热循环实验,结果表明:高温静态氧化后,两种涂层内均形成一层生长氧化层(TGO),该氧化层由Al_(2)O_(3)和TiO_(2)组成,位于粘结层和陶瓷面层之间.大气等离子喷涂制备的涂层经高温氧化后,原有的界面裂纹基本消失;而超音速火焰喷涂制备的涂层在高温氧化过程中,由于TGO过度生长导致界面处仍有裂纹存在.两种涂层在热循环实验后氧含量稍微增加,均没有出现明显的分层现象,表现出较好的抗热震性能。对两种涂层微观组织和高温性能进行对比研究后可知,大气等离子喷涂得到的涂层组织更为均匀致密,抗高温氧化和热循环的性能更好.In this study,a thermal barrier coating consisting of 8 mol%yttria stabilized zirconia(8 YSZ)ceramic face layer and Ti-48 Al-2 Cr-2 Nb interlayer was coated via high velocity oxygen fuel(HVOF)and atmospheric plasma spraying(APS)techniques.The high-temperature oxidation and thermal cycling properties of the coatings prepared by the two techniques were tested compared.After high-temperature oxidation,thermally grown oxide(TGO)layers were observed in both coatings.The TGO consisted of Al_(2)O_(3) and TiO_(2),located between the 8 YSZ and Ti-48 Al-2 Cr-2 Nb layers.However,the interfacial cracks in the coating produced by APS were eliminated after the oxidation,while the cracks still existed in the coating made by HVOF due to overgrowth of the TGO.The oxygen content of the two coatings slightly increased after thermal cycilng text,and no delamination was observed,suggesting good thermal shock resistance.Comparing the microstructures and high-temperature properties of the two coatings,the one prepared by APS has more dense and uniform microstructures,and better thermal oxidation resistance and thermal shock resistance.

关 键 词：钛合金 热障涂层 高温氧化 热循环 

分 类 号：TG174.4[金属学及工艺—金属表面处理]