Heat-treated lanthanum magnesium hexaaluminate coatings exposed to molten calcium-magnesium-alumino-silicate
Heat-treated lanthanum magnesium hexaaluminate coatings exposed to molten calcium-magnesium-alumino-silicate
复制标题
暴露于熔融钙镁铝硅酸盐的热处理六铝酸镧镁涂层
DOI：
10.1016/j.ceramint.2019.03.048
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发表时间：
2019-06
影响因子：
5.2
通讯作者：
Xueqiang Cao
中科院分区：
文献类型：
--
作者：
Jinyan Zeng;Junbin Sun;Panpan Liang;Xiong Yang;Shujuan Dong;Jianing Jiang;Longhui Deng;Xin Zhou;Xueqiang Cao
LaMgAl11O19（LMA）涂层在喷涂过程中由于冷却过快而产生大量非晶相，不利于其在航空发动机中的使用寿命。幸运的是，热处理可以提高LMA tbc的热循环寿命。此外，硅酸钙镁铝的热腐蚀降解也是近年来研究的热点。因此，为了明确热处理对CMAS腐蚀行为的影响，对等离子喷涂的LMA涂层进行等温热处理，然后暴露在CMAS中。结果表明：热处理促进了LMA涂层的结晶，但熔融的CMAS沿纵向微裂纹的增大和扩大完全渗透到LMA涂层中；各向同性孔隙决定了CMAS对LMA的渗透动力学。表面反应产物主要为caal2si2o8和mgal2o4，而内层反应产物Ca3La6(SiO4)6与残留的LMA相互渗透，形成LMA涂层的腐蚀双分子层。
LaMgAl11O19(LMA) coatings usually have a large amount of amorphous phase due to the rapid cooling during spraying, which will not benefit the service lifetime in aeroengine. Fortunately, the thermal cycling lifetime of LMA TBCs can be improved by heat treatment. Moreover, the hot corrosion degradation with calcium-magnesium-alumino-silicate (CMAS) attracts much attention recently. Therefore, to clarify the influence of heat treatment on CMAS corrosion behaviour, plasma-sprayed LMA coatings were isothermally heat-treated and then exposed to CMAS. Results indicate that heat treatment promoted a crystallization of LMA coatings, but the molten CMAS had completely penetrated into LMA coatings along the increased and widened vertical microcracks. It is the isotropic pores that determine the penetration kinetics of CMAS to LMA. CaAl2Si2O8and MgAl2O4were the predominant reaction products in the superficial layer, while Ca3La6(SiO4)6interpenetrated with the residual LMA in the inner layer, forming a corroded bilayer for LMA coatings.
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具有预植入垂直微裂纹的六铝酸镧镁热障涂层：热循环寿命和 CMAS 腐蚀行为
影响因子：
5.2
作者：
Jinyan Zeng;Junbin Sun;Hao Zhang;Fengyuan Qiu;Peifan Zhou;Wenbo Niu;Shujuan Dong;Xin Zhou;Xueqiang Cao
通讯作者：
Xueqiang Cao
影响因子：
5.2
作者：
Jinshuang Wang;Junbin Sun;B. Zou;Xin Zhou;S. Dong;Lifen Li;Jianing Jiang;Longhui Deng;Xueqiang Cao
通讯作者：
Jinshuang Wang;Junbin Sun;B. Zou;Xin Zhou;S. Dong;Lifen Li;Jianing Jiang;Longhui Deng;Xueqiang Cao
DOI：
10.1016/j.jeurceramsoc.2008.07.033
发表时间：
2009-03-01
影响因子：
5.7
作者：
Liu, Zhan-Guo;Ouyang, Jia-Hu;Xia, Xiao-Liang
通讯作者：
Xia, Xiao-Liang
DOI：
10.1007/s12613-014-1034-2
发表时间：
2014-12
期刊：
International Journal of Minerals, Metallurgy, and Materials
影响因子：
--
作者：
Liang-Liang Huang-Liang;H. Meng;Jing-kun Tang
通讯作者：
Liang-Liang Huang-Liang;H. Meng;Jing-kun Tang
影响因子：
24.2
作者：
Clarke, David R.;Phillpot, Simon R.
通讯作者：
Phillpot, Simon R.