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以纳米ZrO2-8 wt%Y2O3(YSZ)和在纳米ZrO2-8 wt%Y2O3中分别掺杂25 wt%和50 wt%纳米CeO2团聚处理后作为隔热层材料,NiCrAlY(Ni-25Cr-5Al-0.5Y,wt%)作为粘结层材料,用等离子喷涂(APS)方法在GH30高温合金表面制备三种材料体系的热障涂层(TBC)。通过扫描电镜(SEM)和X射线衍射仪(XRD)对掺杂了25 wt%纳米CeO2涂层的微观组织结构进行分析研究,测定了三种材料涂层在室温和300、500、700℃时的热导率,并在相同边界条件下测试了它们的隔热性能。结果表明:掺杂纳米CeO2涂层组成相为稳定的t相(t-ZrO2、t-Zr0.82Y0.18O1.91、t-Zr0.82Ce0.18O2)和c相(c-CeO2),涂层中存在闭合的孔隙和微裂纹;掺杂纳米CeO2能够降低涂层的热导率,并且隔热性能随CeO2含量的增加而提高。对于400μm厚的CeO2/ZrO2-Y2O3涂层(CYZ,掺杂25wt%CeO2)对基体产生的温降比纳米YSZ涂层提高了10.7%,当CeO2的含量从25 wt%提高到50 wt%时,隔热性能也提高了7.1%。
The NiCrAlY (Ni-25Cr-5Al-2Al) nanocomposites were prepared by doping nano-ZrO2-8wt% Y2O3 (YSZ) and nano-ZrO2-8wt% Y2O3 doped with 25wt% 0.5Y, wt%) as the bonding layer material, thermal barrier coatings (TBC) were prepared on the GH30 superalloy surface by plasma spraying (APS). The microstructure of the coating doped with 25 wt% nano-CeO2 was analyzed by scanning electron microscopy (SEM) and X-ray diffractometer (XRD). The coatings of three materials were measured at room temperature and at 300, 500 and 700 ℃ Of the thermal conductivity, and in the same boundary conditions tested their thermal insulation properties. The results show that the composition of doped nano-CeO2 coating is stable t-phase (t-ZrO2, t-Zr0.82Y0.18O1.91, t-Zr0.82Ce0.18O2) and c-CeO2 In the presence of closed pores and micro-cracks; doped nano CeO2 can reduce the thermal conductivity of the coating, and thermal insulation properties with increasing CeO2 content increases. For the 400μm thick CeO2 / ZrO2-Y2O3 coating (CYZ, doped with 25wt% CeO2), the temperature drop of the matrix was increased by 10.7% compared with the nano-YSZ coating. When the content of CeO2 increased from 25wt% to 50wt% , Thermal insulation performance also increased by 7.1%.