La2Hf2O7 ceramics as potential top-coat materials for thermal/environmental barrier coatings

La2Hf2O7 ceramics as potential top-coat materials for thermal/environmental barrier coatings
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La2Hf2O7 陶瓷作为热/环境屏障涂层的潜在面漆材料

DOI:
10.1016/j.ceramint.2019.07.235
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发表时间:
2019-07
影响因子:
5.2
通讯作者:
Xueqiang Cao
Xueqiang Cao
中科院分区:
材料科学1区
文献类型:
--
作者:
Panpan Liang;Shujuan Dong;Jinyan Zeng;Jieyan Yuan;Jianing Jiang;Longhui Deng;Xin Zhou;Xueqiang Cao

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烧绿石结构的La 2 Hf 2 O 7(LH)陶瓷在高达1600 °C下具有优异的相稳定性,并且具有远为上级的抗烧结性以及与典型的8wt%氧化钇稳定的氧化锆(8 YSZ)相当的机械性能。更重要的是,它们的热膨胀系数(CTE)为8.76 × 10− 6 K −1,低于8 YSZ(10.38 × 10− 6 K −1),1000 °C时的热导率为1.34 W/m·K,比8 YSZ(2.1-2.22 W/m·K)低约40%。这些综合性能促进了它们作为陶瓷基复合材料(CMC)上的热/环境屏障涂层(T/EBC)或高温合金上的双陶瓷层热障涂层(DCL-TBCs)的隔热面漆。
La2Hf2O7(LH) ceramics with pyrochlore structure have excellent phase stability up to 1600 °C, and far superior sintering resistance as well as comparable mechanical properties to typical 8 wt% yttria-stabilized zirconia (8YSZ). More importantly, they have the coefficients of thermal expansion (CTEs) of 8.76 × 10−6K−1, lower than that of 8YSZ (10.38 × 10−6K−1), and thermal conductivities of 1.34 W/m·K at 1000 °C, approximately 40% lower than that of 8YSZ (2.1–2.22 W/m·K). These comprehensive properties promote them as thermal insulation top-coats in thermal/environmental barrier coatings (T/EBCs) on ceramic-matrix composites (CMCs) or top-coats of double-ceramic-layered thermal barrier coatings (DCL-TBCs) on superalloys.
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