| 溶胶-凝胶法原位生成SiO_2改性硅基耐烧蚀材料 |
| |
| 引用本文： | 姚汝亮,张炜,周达. 溶胶-凝胶法原位生成SiO_2改性硅基耐烧蚀材料[J]. 中国新闻周刊, 2009, 0(2) |
| |
| 作者姓名： | 姚汝亮 张炜 周达 |
| |
| 作者单位： | 国防科学技术大学航天与材料工程学院 |
| |
| 基金项目： | 湖北省自然科学基金(基金号2000J043)资助项目 |
| |
| 摘 要： | 建立了在硅基耐烧蚀材料中用溶胶-凝胶法原位生成SiO2的方法.首先将硅橡胶、气相白炭黑、纤维等原料混炼硫化制备出硫化胶.然后将硫化胶依次浸入四氢呋喃、原硅酸乙酯和正丁基胺水溶液中进行预溶胀处理、物理扩散和化学反应,得到原位生成SiO2.SEM照片显示,在硅基耐烧蚀材料中原位生成的SiO2颗粒呈球形,粒径在40~60 nm,但分布不均匀,在硫化胶表层存在富集现象.实验结果表明,原位生成SiO2平均含量增加,硅基耐烧蚀材料的抗拉强度增加,线烧蚀率下降;含13.7%原位生成SiO2硅基耐烧蚀材料抗拉强度为5.82 MPa,线烧蚀率为0.071 mm/s.
|
| 关 键 词： | 溶胶-凝胶法 硅橡胶 原位生成SiO2 耐烧蚀性能 |
in situ SILICA PREPARATION IN SILICON-BASED ABLATION-RESISTANT MATERIAL BY SOL-GEL METHOD |
| |
| Yao Ruliang; Zhang Wei; Zhou Da. in situ SILICA PREPARATION IN SILICON-BASED ABLATION-RESISTANT MATERIAL BY SOL-GEL METHOD[J]. China Newsweek, 2009, 0(2) |
| |
| Authors: | Yao Ruliang Zhang Wei Zhou Da |
| |
| Affiliation: | Yao Ruliang; Zhang Wei; Zhou Da(College of Areospace and Materials Engineering; National University of Defense Technology; Changsha 410073); |
| |
| Abstract: | A technique of in situ SiO_2 preparation in silicon-based ablation-resistant material by sol-gel method was established.The preparing processes were as follows:first,vulcanizates were prepared by mechanical mixing of silicone rubber,fumed silica and other fillers.Secondly,the vulcanizates were swelled in tetrahydrofuran(THF) at 30°C for 12 h,and subsequently subjected to soaking in the tetraethylorthosilicate(TEOS) for 24 h.Thirdly,the swollen vulcanizates were put into the aqueous solution of n-butylamine ... |
| |
| Keywords: | Sol-gel method Silicone rubber in situ Silica Ablative property |
| 本文献已被 维普 等数据库收录！ |
