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随着航空工业对航空发动机热端部件及其防护材料的性能要求日益严格。环境障涂层经过长时间发展，形成了以稀土硅酸盐为主的第三代材料体系，但是面临长时间CaO-MgO-Al_2O3-SiO2(CMAS)腐蚀，其性能仍难以满足实际工程应用需求。本工作针对1 350℃高温下CMAS的腐蚀环境，研究不同热处理时长对Yb_2Si_2O7-Yb_2SiO5复相涂层微观结构及抗CMAS腐蚀性能的影响，探讨了不同热处理时长对复相涂层抗CMAS腐蚀能力影响的原因。结果表明：热处理过程中，由于发生相转变引起体积膨胀，涂层内的残余应力由拉应力逐渐转变为压应力，有利于涂层内部裂纹的愈合。腐蚀产物主要是针状的磷灰石相Ca_2Yb8(SiO4)_6O2,适当时间的热处理可以提高复相陶瓷的抗CAMS腐蚀能力。
Abstract：With the continuous development of aviation industry, the performance requirements of hot end components and protective materials of aero-engine are increasingly strict.The environmental barrier coating has undergone long-term development and has formed the third-generation environmental barrier coating based on rare earth silicates, but its performance is still difficult to meet the actual engineering application requirements in the long-term CMAS corrosion environment.This paper studied the influence of different heat treatment times on the microstructures and anti-CMAS corrosion properties of the Yb_2Si_2O7-Yb_2SiO5 composite coating at 1 350 ℃,and analyzed the reasons for the influence of different heat treatment times on the anti-CMAS corrosion ability of the composite coating.The results show that during the heat treatment process, the volume expansion caused by the phase transformation leads the residual stress in the coating to change from tensile stress to compressive stress, which is beneficial to the healing of cracks in the coating.The corrosion product is mainly the needle-shaped apatite phase Ca_2Yb8(SiO4)_6O2,and appropriate heat treatment can improve the anti-CMAS corrosion ability of the composite ceramic.
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基本信息:
中图分类号:V263;TG174.4
引用信息:
[1]王顺,郭东辉,徐宝升.热处理对Yb_2Si_2O_7-Yb_2SiO_5复相涂层抗CMAS腐蚀性能的影响[J].热喷涂技术,2024,16(04):46-54.