最终热处理温度对针刺无纬布C/C复合材料性能的影响  

Effect of Ultimate Heat Treatment Temperature on Properties of Needled Felt with Non-woven Cloth Reinforced C/C Composites

作　　者：郑蕊[1,2] 白杨[1,2] 嵇阿琳[1,2] 李艳[1,2] 刘振东[1,2] 

机构地区：[1]西安航天复合材料研究所,西安710025 [2]高性能碳纤维制造及应用国家地方联合工程研究中心,西安710089

出　　处：《材料导报（纳米与新材料专辑）》2016年第1期544-547,共4页

摘　　要：以针刺无纬布预制体为增强体,采用化学气相渗透与沥青浸渍/高压炭化工艺制备高密度(≥1.90g/cm^3)的C/C复合材料,对完成致密的材料分别进行了900℃及1500℃的最终热处理,研究了最终热处理温度对C/C复合材料力学性能、热膨胀系数的影响。结果表明,与未处理的试样相比,经过最终热处理的试样孔隙率明显增大,热处理温度越高孔隙率越高,经过1500℃热处理的试样孔隙率达到9.05%,高出58.2%;经过最终热处理的试样力学性能及轴向热膨胀系数均下降,并且随着热处理温度的升高,轴向热膨胀系数降低越明显,经过1500℃处理的试样1000℃下轴向热膨胀系数由处理前的2.120×10-6/℃降至1.002×10-6/℃,降低幅度达53%,而力学性能总体降低幅度不是很大。By taking needled felt with non-woven cloth as reinforcement phase,the C/C composites were prepared by means of combination process of chemical vapor infiltration（CVI）and high pressure impregnation-carbonization.The materials were heat treated at 900 ℃ and 1500 ℃ respectively after densification.Effects of ultimate heat treatment on mechanical properties and coefficient of thermal expansion（CTE）were studied.The results show that the porosity was significantly increased through heat treatment,and the porosity was increased with the raising of heat treatment temperature（HTT）.The porosity reached 9.05% after heat treatment at 1500℃,increased by 58.2%compared with un-treated samples.Meanwhile the mechanical properties and the axial CTE were reduced by heat treatment,and the axial CTE was clearly decreased with the raising of HTT,the axial CTE of this material at 1000℃ decreased from 2.120×10-6/℃to 1.002×10-6/℃ after the heat treatment at 1500 ℃,decreased by 53%.However,the reduction of mechanical properties was not obvious on the whole.

关 键 词：针刺无纬布 C/C复合材料 最终热处理 性能 

分 类 号：TB332[一般工业技术—材料科学与工程]