Fabrication, microstructure, and mechanical properties of all-oxide ceramic matrix composites using high-yield precursors
Fabrication, microstructure, and mechanical properties of all-oxide ceramic matrix composites using high-yield precursors
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使用高产率前体的全氧化物陶瓷基复合材料的制造、微观结构和机械性能
DOI：
10.1007/s10853-022-07144-5
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发表时间：
2022
影响因子：
4.5
通讯作者：
Kitaoka Satoshi
中科院分区：
文献类型：
--
作者：
Ishioka Yu;Kakisawa Hideki;Shimoda Kazuya;Arai Yutaro;Inoue Ryo;Wada Masashi;Kitaoka Satoshi
以高收率氧化铝为前驱体，采用真空辅助浸渍和无压烧结工艺制备了氧化物纤维增强氧化物基复合材料（Ox/Ox-CMCs）。将Ox/Ox-CMC在1100和1200 °C下烧结2小时。SEM和X射线CT显示，在这两种情况下，基质成功地形成内和之间的编织织物。烧结基体的维氏硬度与各复合材料内的位置无关。在三点弯曲试验中，在拉伸侧的弯曲断裂发生在剪切断裂之前，这表明基质在织造织物之间实现了良好的粘合。在1100 °C下烧结的Ox/Ox-CMC显示出比在1200 °C下烧结的Ox/Ox-CMC更高的拉伸强度。这种强度差异归因于它们的微观结构;在1100 °C下烧结的试样在纤维/基体界面处显示出裂纹偏转，而在1200 °C下烧结的试样具有强粘附界面。两种复合材料在双边缺口拉伸试验中均表现出缺口不敏感行为。
Oxide fiber-reinforced oxide matrix composites (Ox/Ox-CMCs) were fabricated by vacuum-assisted impregnation and pressureless sintering using a high-yield alumina precursor. The Ox/Ox-CMCs were sintered at 1100 and 1200 °C for 2 h. SEM and X-ray CT revealed that in both cases the matrix formed successfully within and between the woven fabrics. Vickers hardness of the sintered matrix was independent of the location within each composite. In a three-point bending test, a bending fracture at the tensile side occurred prior to shear fracture, suggesting that the matrix achieved good adhesion between the woven fabrics. The Ox/Ox-CMC sintered at 1100 °C showed higher tensile strength than that sintered at 1200 °C. This strength difference was attributed to their microstructures; the specimen sintered at 1100 °C showed crack deflection at the fiber/matrix interface, while that sintered at 1200 °C had a strongly adherent interface. Both composites showed notch-insensitive behavior in double-edge notch tensile tests.