Thermal cycling and reactivity of a MoSi2/ZrO2 composite designed for self-healing thermal barrier coatings
Thermal cycling and reactivity of a MoSi2/ZrO2 composite designed for self-healing thermal barrier coatings
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DOI：
10.1016/j.matdes.2016.01.054
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发表时间：
2016-03
影响因子：
8.4
通讯作者：
Franck Nozahic;D. Monceau;C. Estournès
中科院分区：
文献类型：
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作者：
Franck Nozahic;D. Monceau;C. Estournès
采用火花等离子烧结技术，将二硅化钼（MoSi2）颗粒分散在部分稳定氧化锆（8Y2O3-Zr02）基体上，制备了固结复合材料（相对密度为84%）。研究了复合材料在1000 ~ 1300℃温度范围内的循环氧化。该复合材料的抛物速率常数（kp）值与文献中获得的MoSi2块体氧化的抛物速率常数（kp）值一致。氧化暴露后，观察到Mo5Si3、sio2和zrsio4相的形成。这些观察结果与在YPSZ热障涂层中使用mosi2作为自愈剂是一致的。
Consolidated (relative density of 84%) composite made of molybdenum di-silicide (MoSi2) particles dispersed in a yttria partially stabilized zirconia matrix (8Y2O3–Zr02) was prepared by spark plasma sintering. Cyclic oxidation of the composite at temperature ranging from 1000 °C to 1300 °C was studied. Parabolic rate constants (kp) values of the composite material are in good agreement with those obtained in the literature for the oxidation of bulk MoSi2. Following oxidation exposure, formation of Mo5Si3, SiO2and ZrSiO4phases was observed. These observations are compatible with the use of MoSi2as a self-healing agent in YPSZ thermal barrier coatings.