| 微波水热时间对C/C复合材料结构和抗氧化性能的影响 |
| Influence of Time on Structure and Oxidation Resistance of Carbon/Carbon Composites Modified by a Microwave Hydrothermal Process |
|
| 摘要: 以磷酸、B4C和Al2O3为原料，采用一种新的微波水热法对C/C复合材料基体进行了抗氧化改性，重点研究了微波水热时间对改性试样物相组成、微观结构和抗氧化性能的影响。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能量色散谱仪(EDS)及X射线光电子能谱(XPS)对改性后试样进行了表征。结果表明：改性后复合材料表面覆盖了一层由熔融态的HPO3、B2O3和结晶的Al(PO3)3、微量B4C粒子组成的涂层。经60~120 min的微波水热改性，复合材料的抗氧化性能随着微波水热处理时间的延长而改善，达到一定程度后，其变化不再明显。微波水热处理100 min后的试样抗氧化性能最佳，在600 ℃静态空气气氛下氧化16 h后，氧化失重仅为9.5×10-4 g·cm-2，氧化失重速率维持在4.46×10-5 g·cm-2·h-1的极低水平。 |
| 关键词: C/C复合材料 微波水热 氧化 |
| 基金项目: |
| Abstract: Carbon/carbon (C/C) composites were modified by a new microwave hydrothermal (MH) process using B4C, Al2O3 powders and phosphoric acid as source materials. The influence of the MH treatment time on the phase, microstructure and anti-oxidation property of the as-modified composites was investigated. The as-modified C/C composites were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and X-ray photoelectron spectroscopy techniques. Results show that the surface of the modified C/C composites is covered by a coating composed of molten HPO3, B2O3 and crystalline Al(PO3)3, with a little of B4C particles. The oxidation resistance of the composites is effectively improved with the increase of time at the range of 60~120 min. The mass loss of the modified C/C composites treated at 200 ℃ for 100 min is only 9.5×10-4 g·cm-2 after oxidized at 600 ℃ in static air for 16 h and the corresponding mass loss rate is only 4.46×10-5 g·cm-2·h-1. |
| Keywords: carbon/carbon composites microwave hydrothermal oxidation |
| |
| 摘要点击次数: 1606 |
| 全文下载次数: 1686 |
| 弭 群,曹丽云,黄剑锋,杨新平.微波水热时间对C/C复合材料结构和抗氧化性能的影响[J].无机化学学报,2011,27(3):457-462. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
