摘要
以聚碳硅烷、SiC微粉为原料,二维碳纤维织物为增强体,采用先驱体转化法制备了2D-Cf/SiC复合材料,考察了模压压力对2D-Cf/SiC复合材料常温力学性能的影响。结果表明,随着模压压力的增加,纤维体积分数明显提高,但材料的力学性能未能随之提高,主要原因在于随着压力增加,SiC微粉对碳纤维的损伤加剧。模压压力的增加导致纤维体积分数增加和纤维损伤的加剧,两方面的原因造成模压压力对材料的力学性能影响不大。有压成型比无压成型制得的材料的高温抗氧化性要好,主要原因是在0MPa压力下,材料基体更容易出现裂纹,从而使得高温条件下氧化气氛更容易对材料性能造成损害。
Using PCS and SiC micropwder as raw materials, 2D-Carbon fiber cloth as reinforcer, 2D-Cf/SiC composites were prepared, adopting precursor transformation process. The effects of molding pressures on the mechanical properties of 2D-Cf/SiC composites were investigated. The results show that the mechanical properties cannot be obviously improved with the increase of molding pressure. The main reason could be ascribed to that the SiC micropowder damages the carbon fiber more and more seriously on the one hand, and on the other hand the fiber volume fraction is increased with the increase of molding pressure, resulting in a unnoticeable influence of the molding pressure on the mechanical properties of the composite. The anti-oxidation properties of the composites fabricated under molding pressure are better than that of composite under pressureless. The primary reason is that flaws appear more easily in the matrix of composites fabricated with 0 MPa, resulting in more serious damnification on properties of composites in oxidation atmosphere at high temperature
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第A01期622-624,共3页
Rare Metal Materials and Engineering
基金
国防预研资助项目
