热处理工艺对纳米氧化锆粉体微观结构与涂层性能的影响  

Influence of Heat Treatment on Microstructures and Properties of Nanosized Zirconia Powder and Coating

作　　者：姚星合[1,2] 朱永平[1] 张伟刚[1] 

机构地区：[1]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《过程工程学报》2011年第1期124-130,共7页The Chinese Journal of Process Engineering

摘　　要：研究了高温煅烧、等离子炬和等离子流场3种热处理工艺对ZrO2-8%(mol)Y2O3(8YSZ)球形颗粒及其等离子喷涂涂层微观组织结构的影响.结果表明,由等离子炬处理后的8YSZ颗粒制备的等离子喷涂涂层的结合强度最高,平均为25MPa,抗热震性能最好,1200℃恒温5min,水冷、热循环达41次;而采用等离子流场处理的颗粒所制涂层结合强度最差,平均为11MPa,热震时涂层易开裂,热循环次数为17次;高温煅烧的颗粒所制涂层性能依赖于煅烧温度和时间,其中1200℃下煅烧2h的颗粒所制涂层力学性能最优,平均结合强度为21MPa,热循环次数为38次.The effects of high-temperature sintering,plasma torch and plasma flow heat treatments on the properties of ZrO2-8%mol Y2O3 （8YSZ） spherical powder and plasma sprayed coating were investigated.The results show that the plasma sprayed coating derived from plasma torch treated powder of 8YSZ has the highest bonding strength of 25 MPa and the best thermal shock resistance of 41 thermal cycles which is under water cooling after treatment at 1200℃ for 5 min.The coating fabricated by plasma flow treated 8YSZ has very low bonding strength of 11 MPa and poor thermal shock resistance of 17 thermal cycles.The coating prepared by sintering treated 8YSZ relies on the temperature and time of treatment,and the best mechanical properties are obtained when 8YSZ powder is treated at 1200℃ for 2 h,the average is 21 MPa and 38 thermal cycles.

关 键 词：氧化钇稳定氧化锆 粉末热处理方法 等离子喷涂 热障涂层 涂层性能 

分 类 号：TG174.442[金属学及工艺—金属表面处理]