一种RTM用耐烧蚀改性酚醛树脂性能研究

RESEARCH ON PROPERTIES OF A ABLATIVE MODIFIED PHENOLIC RESIN

对一种新型改性酚醛树脂的粘度特性、耐热性和耐烧蚀性能及其复合材料的性能进行了研究,得出该树脂体系的粘度在60~120℃的范围内均小于800m Pa·s,且在70℃、80℃时工艺适用期大于150min;其玻璃化温度Tg为253℃,氮气气氛800℃残炭率可达到67.1%,质量烧蚀率和线烧蚀率分别为0.0766g/s、0.119mm/s;RTM成型碳纤维增强改性酚醛树脂复合材料的层间剪切强度和轴向压缩强度分别可达39.3MPa和177MPa,氧-乙炔烧蚀的线烧蚀率和质量烧蚀率分别为0.044mm/s、0.0762g/s。结果表明,该种树脂体系具有粘度低、工艺适用期长以及良好的耐热性和耐烧蚀性能,能很好地满足RTM工艺的要求,且其碳纤维针刺复合材料具有作为耐烧蚀材料的潜质。

In this paper,a modified phenolic resin was studied,including viscosity property,heat resistance and ablative property. It is found that the viscosity of resin system is lower than 800 m Pa·s in the range of 60 ~120℃,process applicable period is longer than 150 mins at 70℃ and 80℃. The glass transition temperature is253℃,carbon residue rate at 800℃ is 67. 1% in the Nitrogen atmosphere,quality ablation rate and linear ablation rate are 0. 0766 g / s and 0. 119 mm / s. Carbon fiber needling preform reinforced the modified phenolic resin composite was made by RTM,its interlayer shear strength and axial compressive strength are 39. 3MPa and 177 MPa,respectively. The linear ablation rate and quality ablation rate are 0. 044 mm / s and 0. 0762 g / s. Experimental results show that this modified phenolic resin system,which has low viscosity,long process applicable period,good heat resistance and ablative property,can meet the requirement of RTM process well,and its carbon fiber needling perform composite has the potential of being used as ablation resistant material.