采用FTIR及TG对SiBN陶瓷纤维的结构及高温稳定性进行分析，在空气气氛中1400℃下对其进行高温氧化处理，并利用SEM、XRD、EDS等手段对高温处理后陶瓷纤维的结构及元素分布情况进行表征。结果表明：SiBN陶瓷纤维具有良好的高温稳定性，Si—N键、B—N键构成了SiBN陶瓷纤维的骨架架构，其碳的质量分数仅为0.1%；经高温氧化处理后SiBN纤维出现明显的皮芯结构，其中O元素以SiO2的形式主要富集在皮层，隔绝了纤维内部与空气的接触，从而保证了纤维的高温稳定性。另外，高温氧化处理后仍保持其纤维形状，结构致密，无明显孔洞，且仍为无定型结构。
The chemical structure and the thermal stability of SiBN ceramic fibers were investigated by FTIR and TG. SiBN ceramic fibers were treated under air atmosphere at 1 400℃. The structure and the element contents along the radius of SiBN ceramic fibers after the air?oxidation treatment were characterized by means of SEM,XRD and EDS. The results show that SiBN ceramic fibers exhibit good thermal stability at high temperature,which contain Si?N bonds and B?N bonds in the back?bone of the fiber and low carbon content (0.1%). After the air?oxidation treatment,the ceramic fibers show a skin?core structure. Oxygen mainly exists in the form of SiO2 in the skin of fiber,which can prevent the air from the interior of the fibers, thus providing the high temperature stability. In addition,after air?oxidation treatment,the SiBN ceramic fibers maintain their fiber shape and still show compact structure without micropores and amorphous character.
参考文献
| [1] | 陈明伟,戈敏,张伟刚.有机前驱体法BN纤维的制备和表征[J].无机材料学报,2012(11):1216-1222. |
| [2] | 张婧,唐彬彬,韩克清,刘振全,孙泽玉,余木火.Si-B-N-C陶瓷纤维的高温抗氧化性[J].合成纤维,2012(08):14-17,26. |
| [3] | 唐云 .先驱体转化法制备SiBN陶瓷纤维研究[D].国防科学技术大学,2009. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%