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High-temperature oxidation behavior of SiBN fibers in air
Journal of Advanced Ceramics ( IF 16.9 ) Pub Date : 2021-03-29 , DOI: 10.1007/s40145-021-0471-4
Xin Long , Zhenyu Wu , Changwei Shao , Xiaozhou Wang , Yingde Wang

SiBN fibers are one of the most admirable microwave-transparent reinforced materials for high Mach number aircrafts. Currently, the detailed high-temperature oxidation behavior of SiBN fibers has not been studied yet. In this work, we studied the high-temperature oxidation behavior of SiBN fibers with different boron contents at the temperature range of 1000–1400 °C in air. SiBN fibers started to be oxidized at 1100 °C, with Si3N4 and BN phase oxidized to SiO2 and B2O3, respectively. Due to the gasification and the escape of molten B2O3 at high temperatures, amorphous SiO2 could be remained at the fiber surface. As the fiber further oxidized, the molten B2O3 at the inside may infiltrate into the fiber interior to react with Si3N4, causing the precipitation of hexagonal boron nitride (h-BN) nanoparticles and the formation of SiO2/BN layer. Finally, complex oxidation layers with two distinct concentric sublayers accompanied with two transition sublayers could be formed after the oxidizing treatment.



中文翻译:

SiBN纤维在空气中的高温氧化行为

SiBN纤维是高马赫数飞机最令人钦佩的微波透明增强材料之一。目前,尚未研究SiBN纤维的详细高温氧化行为。在这项工作中,我们研究了在空气中1000-1400°C的温度范围内,不同硼含量的SiBN纤维的高温氧化行为。SiBN纤维在1100°C时开始被氧化,Si 3 N 4和BN相分别被氧化为SiO 2和B 2 O 3。由于高温下气化和熔融B 2 O 3的逸出,非晶态SiO 2可能保留在纤维表面。随着纤维的进一步氧化,内部的熔融B 2 O 3可能会渗入纤维内部并与Si 3 N 4反应,从而导致六方氮化硼(h-BN)纳米粒子沉淀并形成SiO 2 / BN层。最后,在氧化处理之后,可以形成具有两个不同的同心子层以及两个过渡子层的复合氧化层。

更新日期:2021-03-29
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