Thermal cycling behavior of the plasma-sprayed coating of lanthanum hexaaluminate
Thermal cycling behavior of the plasma-sprayed coating of lanthanum hexaaluminate
复制标题
六铝酸镧等离子喷涂涂层的热循环行为
DOI：
10.1016/j.jeurceramsoc.2017.12.046
复制
发表时间：
2018
影响因子：
5.7
通讯作者：
Xueqiang Cao
中科院分区：
文献类型：
--
作者：
Junbin Sun;Jinshuang Wang;Xin Zhou;Yu Hui;Shujuan Dong;Lifen Li;Longhui Deng;Jianing Jiang;Xueqiang Cao
非晶相常见于等离子喷涂 LaMgAl11O19 涂层中。在这项工作中，使用在 1300°C 至 1600°C 的温度范围内合成的粉末，通过大气等离子喷涂沉积 LaMgAl11O19 涂层。原料的熔化程度受第二相LaAlO3的含量和粉末密度的影响，而密度又取决于合成温度。因此，制备了具有不同非晶相含量和微观结构的LaMgAl11O19涂层。结果表明，非晶含量越低，涂层在再结晶过程中的体积收缩越小，热循环寿命越长。然而，当非晶含量处于相同水平时，这些涂层的热循环寿命差异似乎取决于晶粒尺寸。采用1450℃合成粉末喷涂的LMA涂层具有相对较低的非晶含量和适中的晶粒尺寸，表现出最长的热循环寿命。
Amorphous phase is commonly found in plasma-sprayed LaMgAl11O19coating. In this work, LaMgAl11O19coatings were deposited by atmospheric plasma spraying with powders synthesized at the temperatures range from 1300 °C to 1600 °C. The melting degree of the feedstock was influenced by the amount of the second phase LaAlO3and density of the powders, which was dependent on the synthesis temperature. Therefore, LaMgAl11O19coatings with different amorphous phase contents and microstructures were produced. Results showed that the lower the amorphous contents, the lower the volume shrinkage of the coating during the recrystallization process and the longer the thermal cycling lifetime. However, when the amorphous contents were in the same level, the thermal cycling lifetime differences of these coatings seemed to be dependent on the grain size. LMA coating sprayed with powders synthesized at 1450 °C had relatively low amorphous content and moderate grain size, showing the longest thermal cycling lifetime.