当前位置: X-MOL 学术Ceram. Int. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
High-temperature mechanical properties of Nextel TM 610 fiber reinforced silica matrix composites
Ceramics International ( IF 5.2 ) Pub Date : 2018-09-01 , DOI: 10.1016/j.ceramint.2018.05.185
Ru Jiang , Lingwei Yang , Haitao Liu , Xun Sun , Haifeng Cheng

Abstract Novel Nextel™ 610 fiber reinforced silica (N610f/SiO2) composites were fabricated via sol-gel process at a sintering temperature range of 800–1200 °C. The sintering-temperature dependent microstructures and mechanical properties of the N610f/SiO2 composites were investigated comprehensively by X-ray diffraction, nanoindentation, three-point bending etc. The results suggested a thermally stable Nextel™ 610 fiber whose properties were barely degraded after the harsh sol-gel process. A phase transition in the silica matrix was observed at a critical sintering temperature of 1200 °C, which led to a significant increase in the Young's modulus and hardness. Due to the weak fiber/matrix interfacial interaction, the 800 °C and 1000 °C fabricated N610f/SiO2 composites exhibited quasi-ductile fracture behaviors. Specially, the latter possessed the highest flexural strength of ≈ 164.5 MPa among current SiO2-matrix composites reinforced by fibers. The higher sintering-temperature at 1200 °C intensified the SiO2 matrix, but strengthened the interface, thus resulting in a brittle fracture behavior of the N610f/SiO2 composite. Finally, the mechanical properties of this novel composite presented good thermal stability at high temperatures up to 1000 °C.

中文翻译:

Nextel TM 610 纤维增强二氧化硅基复合材料的高温力学性能

摘要 新型 Nextel™ 610 纤维增强二氧化硅 (N610f/SiO2) 复合材料是通过溶胶-凝胶工艺在 800–1200 °C 的烧结温度范围内制造的。通过 X 射线衍射、纳米压痕、三点弯曲等综合研究了 N610f/SiO2 复合材料的烧结温度依赖性微观结构和机械性能。溶胶-凝胶工艺。在 1200 °C 的临界烧结温度下观察到二氧化硅基质中的相变,这导致杨氏模量和硬度显着增加。由于纤维/基质界面相互作用较弱,800 °C 和 1000 °C 制备的 N610f/SiO2 复合材料表现出准韧性断裂行为。特别,后者在目前由纤维增强的 SiO2 基复合材料中具有 ≈ 164.5 MPa 的最高弯曲强度。1200 °C 的较高烧结温度强化了 SiO2 基体,但强化了界面,从而导致 N610f/SiO2 复合材料的脆性断裂行为。最后,这种新型复合材料的机械性能在高达 1000 °C 的高温下表现出良好的热稳定性。
更新日期:2018-09-01
down
wechat
bug