Lanthanum–titanium–aluminum oxide: A novel thermal barrier coating material for applications at 1300 °C
Lanthanum–titanium–aluminum oxide: A novel thermal barrier coating material for applications at 1300 °C
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DOI：
10.1016/j.jeurceramsoc.2011.03.036
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发表时间：
2011-08
影响因子：
5.7
通讯作者：
Xiaoyu Xie;Hongbo Guo;S. Gong;Huibin Xu
中科院分区：
文献类型：
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作者：
Xiaoyu Xie;Hongbo Guo;S. Gong;Huibin Xu
为了满足先进涡轮机发动机的要求，人们正在努力探索具有更高温度能力的新型热障涂层（TBC）材料。本文提出并研究了LaTi 2Al 9 O 19（LTA）作为一种在1300 °C下应用的新型TBC材料。LTA在高达1600 °C下显示出优异的相稳定性。LTA涂层的热导率在1.0-1.3 W m− 1 K −1（300-1500 °C）范围内，热膨胀系数值从8.0增加到11.2 × 10− 6 K −1（200-1400 °C），与氧化钇稳定的氧化锆（YSZ）相当。LTA涂层和YSZ涂层的显微硬度均在0.7GPa左右，但断裂韧性值相对低于YSZ涂层。LTA/YSZ双陶瓷层的设计弥补了低断裂韧性的不足，LTA/YSZ热障涂层在1300 °C的热循环寿命接近700 h。
Considerable efforts are being invested to explore new thermal barrier coating (TBC) materials with higher temperature capability to meet the demand of advanced turbine engines. In this work, LaTi2Al9O19(LTA) is proposed and investigated as a novel TBC material for application at 1300 °C. LTA showed excellent phase stability up to 1600 °C. The thermal conductivities for LTA coating are in a range of 1.0–1.3 W m−1K−1(300–1500 °C) and the values of thermal expansion coefficients increase from 8.0 to 11.2 × 10−6K−1(200–1400 °C), which are comparable to those of yttria stabilized zirconia (YSZ). The microhardness of LTA and YSZ coatings were in the similar level of ∼7 GPa, however, the fracture toughness value was relatively lower than that of YSZ. The lower fracture toughness was compensated by the double-ceramic LTA/YSZ layer design, and the LTA/YSZ TBC exhibited desirable thermal cycling life of nearly 700 h at 1300 °C.