表面技术2017，Vol.46Issue(5)：88-93,6.DOI:10.16490/j.cnki.issn.1001-3660.2017.05.015
合金钢热障涂层等离子喷涂及高温力学特性研究
Preparation and Mechanical Behavior at High Temperature of Plasma Sprayed Thermal Barrier Coatings on Alloyed Steel
摘要
Abstract
The work aims to investigate microstructure and mechanical behavior at high temperature of thermal barrier coatings (TBCs) by air plasma spraying (APS), and provide theoretical evidences for application and failure mechanism of TBCs on alloy steel. The TBCs of NiCoCrAlY/YSZ were prepared on 30CrMnSiA steel substrate by APS. Failure behavior ofTBCs at high temperature was studied by means of such techniques as scanning electron microscope observation, phase analy-sis, thermal shock test and tensile test. The TBCs prepared by APS on alloyed steel were typical double-layer lamellar structures and YSZ coating had a stable tetragonal phase. Breaking load of the coating samples at 800 was slightly 10% higher than that℃of uncoated samples. TBCs exhibited good thermal shock resistance. TBCs remained intact after 10 times of thermal shock test at 900 ; TBCs peeled off and failed after 6 times o℃ f thermal shock test at 1000 . The peeled℃ -off coating was located between the bonding layer and substrate. The steel substrate was oxidized and corroded during thermal shock cycle. Stress concentration shall occur along edges of the coating samples and then cracks extended from edges to the center, and eventually caused the coating to peel off in bulk. The temperature increased from 700 to 900 , decrease amplitude of NiCoCrAlY coating har℃ ℃ d-ness was bigger than that of YSZ coatings or 30CrMnSi substrate. Thermal expansion mismatch between bonding layer and al-loy steel is the primary cause of coating peeling-off after thermal shock test. Heat insulation effect of the TBCs lowers tempera-ture of the substrate, hence its breaking load is higher than that of uncoated samples.关键词
等离子喷涂/热障涂层/拉伸特性/热震性能/高温硬度Key words
air plasma spraying/thermal barrier coatings/tensile property/thermal shock resistance/high-temperature hardness分类
矿业与冶金引用本文复制引用
赵子鹏,李忠盛,张新华,盖鹏涛,何庆兵,张隆平,田武强..合金钢热障涂层等离子喷涂及高温力学特性研究[J].表面技术,2017,46(5):88-93,6.基金项目
国防基础科研项目(A1020132032,A0520132002) （A1020132032,A0520132002）
国防技术基础项目(JSCG2016209B005) Supported by Project of National defense Basic research (A1020132032, A0520132002) and Project of National defense Technology Research (JSCG2016209B005) （JSCG2016209B005）
