Gd2(Zr1-xCex)2O7热障涂层陶瓷层材料的CMAS热腐蚀行为研究

在1250℃的温度下对Gd2(Zr1-xCex)2O7(x=0,0.1,0.2,0.3)陶瓷分别进行了5、10和20 h不同腐蚀时间的CMAS热腐蚀实验,利用XRD、SEM及EDS等表征手段对腐蚀过程中元素的扩散、物相和形貌的变化进行了研究。结果表明,CMAS与Gd2(Zr1-xCex)2O7(x=0,0.1,0.2,0.3)陶瓷在不同的腐蚀时间段内都会生成以萤石Ca0.2(ZrxCe1-x)0.8O1.8和磷灰石Ca2(GdxCe1-x)8(SiO4)6O6-4x为主的反应层腐蚀产物。Ce4+的掺杂含量越多,反应层的厚度越薄,而Gd2(Zr0.7Ce0.3)2O7在任一腐蚀时间段其反应层厚度都是最薄的,相比较而言其抗CMAS热腐蚀性能是最好的。Ce4+的掺杂加快了CMAS与陶瓷的反应速率,从而快速形成致密的反应层阻止CMAS向陶瓷层内部的侵蚀并且提高了陶瓷的应变容限。

Hot Corrosion Behavior of Gd(ZrCe)O Thermal Barrier Coating Ceramics Exposed to Artificial Particulates of CMAS

Artificial particulates of calcium magnesium aluminum silicate(CMAS) induced hot-corrosion of Gd2(Zr1-xCex)2 O7(x=0,0.1,0.2,0.3) ceramics at 1250℃ for 5,10 and 20 h in lab atmosphere.Was assessed by means of XRD,SEM and EDS.The results show that the reaction of CMAS and Gd2(Zr1-xCex)2 O7(x=0, 0.1,0.2,0.3) ceramics will generate the corrosion products composed mainly of fluorite Ca0.2(ZrxCe1-x)0.8O1.8 and apatite Ca2(GdxCe1-x)8(SiO4)6 O6-4 x.The more Ce4+ doping content,the thinner the reaction layer,and GZ7 C3 has the thinnest reaction layer thickness for any corrosion time period,thereby,its resistance to CMAS induced hot-corrosion is the best.The doping of Ce4+ accelerates the reaction rate between CMAS and ceramics,thereby quickly forming a dense reaction layer to prevent the CMAS from inward corrosion and increase the strain tolerance of the ceramic.