Improving self-healing ability and flexural strength of ytterbium silicate-based nanocomposites with silicon carbide nanoparticulates and whiskers
Improving self-healing ability and flexural strength of ytterbium silicate-based nanocomposites with silicon carbide nanoparticulates and whiskers
复制标题
碳化硅纳米颗粒和晶须提高硅酸镱基纳米复合材料的自愈合能力和弯曲强度
DOI：
10.2109/jcersj2.20179
复制
发表时间：
2021-04-01
影响因子：
1.1
通讯作者：
Nakayama, Tadachika
中科院分区：
文献类型：
--
作者：
Son Thanh Nguyen;Takahashi, Tsuyoshi;Nakayama, Tadachika
在航空工业的新兴时代，碳化硅（SiC）被认为是用于燃气涡轮机发动机叶片的合适材料。为了保护这种陶瓷部件在热蒸汽环境中不被氧化和挥发，应使用环境屏障涂层。具有自修复能力的SiC/Yb_2Si_2O_7-Yb_2SiO_5复合材料是该涂层顶层的候选材料。在这项研究中，SiC/Yb 2Si 2 O 7-Yb 2SiO 5纳米复合材料的裂纹愈合行为进行了研究，通过预开裂，然后在氧化环境中退火。与以前的研究相比，通过将SiC的体积分数增加到20%，可以将愈合时间和愈合温度降低到15 min和800 ℃。此外，在本研究中，通过结合两种类型的SiC填料（晶须和纳米颗粒），创建了具有自愈合能力和上级强度的纳米复合材料。X射线衍射和扫描电子显微镜分析表明，复合材料的自愈合机制是SiC的氧化和与体积膨胀有关的硅酸盐相变。根据实验结果，确定了晶须与纳米颗粒的最佳体积比为1/3。(C)2021年，日本陶瓷协会。All rights reserved.
In the emerging era of aircraft industry, silicon carbide (SiC) is regarded as an appropriate material for gas turbine engine blades. In order to protect this ceramic component against the oxidation and volatilization in hot steam environments, environmental barrier coating should be utilized. The composite of SiC/Yb2Si2O7-Yb2SiO5 with self-healing ability is a candidate for the top layer of this coating. In this study, the crack-healing behavior of SiC/Yb2Si2O7-Yb2SiO5 nanocomposites is investigated by pre-cracking followed by annealing in oxidizing environments. Comparing to previous studies, the healing time and healing temperature can be reduced to 15 min and 800 degrees C by increasing the volume fraction of SiC to 20%. In addition, nanocomposites with both self-healing ability and superior strength were created in this research by combining two types of SiC filler (whiskers and nanoparticulates). The self-healing mechanism in these composites is the SiC oxidation and silicate transformation associated with their volume expansion, which is evidenced by X-ray diffraction and scanning electron microscope. According to the results, the best volume ratio between whisker and nanoparticulate is determined as 1/3. (C) 2021 The Ceramic Society of Japan. All rights reserved.