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

作　　者：弭群[1] 曹丽云[1] 黄剑锋[1] 杨新平[1] 

机构地区：[1]陕西科技大学,教育部轻化工助剂化学与技术重点实验室,西安710021

出　　处：《无机化学学报》2011年第3期457-462,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.50772063);教育部博士点基金(No.20070708001);陕西科技大学研究生创新基金资助项目

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。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.

关 键 词：C/C复合材料 微波水热 氧化 

分 类 号：TB322[一般工业技术—材料科学与工程]