| 引用本文: | 唐胜,童乙青.碳化硅纤维的表面分析.[J].国防科技大学学报,1986,(3):77-85.[点击复制] |
| Tang Sheng,Tong Yiqing.Surface Analysis of Silicon Carbide Fibre[J].Journal of National University of Defense Technology,1986,(3):77-85[点击复制] |
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| 碳化硅纤维的表面分析 |
| 唐胜, 童乙青 |
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| 摘要: |
| 应用X—射线光电子能谱 (XPS)、俄歇电子能谱 (AES) 等电子能谱和热重分析(TG)、X—射线衍射 (XRD) 等物理方法，考察了由聚碳硅烷法制备的连续 SiC 纤维的表面性质，比较了不同的预处理条件对纤维表面组成、结构和性质的影响。结果表明，SiC纤维表面涂层可经500℃热处理或丙酮浸渍脱除；其体相结构为超细的β-SiC微晶结构，其表面存在硅氧化合物层，可能为 α-SiO2 结构。在空气中 500℃焙烧时，随着焙烧时间增长，表面氧化硅层增厚，同时表面游离碳含量减小。SiC纤维表面层硅氧化合物对酸较稳定，但易溶于热的浓碱。 |
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| 投稿日期：1986-01-14 |
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| Surface Analysis of Silicon Carbide Fibre |
| Tang Sheng, Tong Yiqing |
| Abstract: |
| Using XPS， AES etc. e1ectron spectroscopic techniques and TG， XRD etc. physical methods，surface properties of continuous SiC fibre made from polycarbosilicane precursors have been investigated. The effects of various pretreatment conditions on surface composition，construction and characters of the fibre have also been compared. The data show that the coating layer on the surface of SiC fibre can be removed by heat-treatment at the temperature of 500℃ or by macerating with acetone，bulk construction in the SiC fibre may be ultra-fine crystallite of β-SiC; on its surface there is a layer of silicon oxide，which may be a-SiO2 crystallite. When calcined. at 500℃ in the air，the layer of silicon oxide on the surface of the SiC fibre thickens and the free carbon content in the surface decreases with the calcinating time. This kind of silicon oxide in the surface layer of the SiC fibre has good stability in acids but is likely to dissolve in the hot concentrated alkalis. |
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