氮化硼纤维抗水蚀性研究

Water Corrosion Resistance of Boron Nitride Fiber

采用SEM、HTEM、XRD及EDS等手段综合分析了沸水蒸煮180 min前后氮化硼纤维的微观结构和组分变化。蒸煮180 min后,纤维失重23.78%,强度保留率69%。BN纤维水煮时,水解反应首先在其表面缺陷处发生,然后水沿着纤维内部孔隙通道等缺陷进入,进一步发生水解反应。通过控制BN纤维低温氮化和高温稳定化处理制度,可以使纤维失重降低至5%以下,纤维抗水蚀性能显著提高。

SEM,HTEM,XRD and EDS were used to analyze the changes in microstructure and composition of boron nitride fibers before and after heating for 180 min in boiling water.After treatment,the weight loss and the retention rate of strength of the fiber were 23.78%and 69%,respectively.When the BN fiber absorbs moisture,hydrolyze reaction occurs firstly around the surface defects,and the further occurs when the water enters along defects such as pore channels in fibers.By controlling the low temperature nitriding and high temperature stabilization treatment for BN fibers,the weight loss of the fiber may reduced to less than 5%,and the water corrosion resistance of fiber is greatly improved.