熔盐环境下热障涂层新材料Mg2SiO4的高温腐蚀研究  

High-temperature Corrosion Behavior of Novel Material Mg2SiO4 for Thermal Barrier Coatings in Molten Salt Environments

作　　者：陈思 周鑫 张豪 曹学强 CHEN Si;ZHOU Xin;ZHANG Hao;CAO Xue-qiang(School of Materials Science and Engineering,State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学材料科学与工程学院硅酸盐建筑材料国家重点实验室

出　　处：《人工晶体学报》2019年第8期1534-1538,1570,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51702244);湖北省自然科学基金(2017CFB28)

摘　　要：采用高温固相反应法合成了Mg2SiO4陶瓷粉末,冷压成型后烧结成陶瓷块材。盐涂法制备V2O5涂覆的样品,利用马弗炉在950℃空气气氛下保温不同时间。对热腐蚀后的样品进行表面形貌、截面特征的表征,并对Mg2SiO4的高温熔盐腐蚀机制进行分析研究。结果表明:熔融的V2O5对Mg2SiO4陶瓷试样产生两种形式的腐蚀降解作用,即溶解-沉淀机制形成腐蚀产物Mg2V2O7和SiO2以及沿晶界腐蚀为主的渗透腐蚀作用。In this paper,Mg2SiO4 ceramic powder was synthesized by high temperature solid-state reaction and sintered into ceramic bulks after cold pressing. Samples coated with V2 O5 were prepared by salt coating method. The samples were heated at 950 ℃ for different time by muffle furnace. The surface morphology and cross-section characteristics of the hot corrosion samples were characterized,and the corrosion mechanism was also studied. The results show that the melted V2O5 has two forms of corrosion degradation on Mg2SiO4 ceramic specimens,i. e. The dissolution-precipitation mechanism forms the corrosion products Mg2V2O7 and SiO2,and the penetration corrosion mainly along grain boundaries.

关 键 词：热障涂层 Mg2SiO4 溶解-沉淀机制 晶界腐蚀 

分 类 号：TB35[一般工业技术—材料科学与工程]