RTM成型石英/苯并噁嗪复合材料的孔隙率研究  

Study on Porosities of Quartz/Benzoxazine Composite Fabricated by RTM Process

作　　者：尹昌平[1] 肖加余[1] 李建伟[1] 曾竟成[1] 江大志[1] 

机构地区：[1]国防科技大学航天与材料工程学院,长沙410073

出　　处：《航空材料学报》2010年第2期82-88,共7页Journal of Aeronautical Materials

基　　金：武器装备预研基金资助项目(51489040105KG0101)

摘　　要：采用RTM工艺制备石英/苯并噁嗪复合材料,研究了主要工艺参数对其孔隙率的影响,并和石英/钡酚醛复合材料进行了对比。结果表明,较之纯低压或纯高压的注射方式,先低压后高压的注射方式可显著降低孔隙率;注射温度对孔隙率有一定影响,较佳的注射温度应是树脂黏度达到100～500mPa.s时的温度;孔隙率随着纤维体积含量的增加而减小,而制件厚度对其影响不大。在给定的先1atm后4.5atm的注射压力,50%纤维体积含量,6mm制件厚度,钡酚醛和苯并噁嗪注射温度分别为62℃和96℃的条件下,石英/苯并噁嗪复合材料的孔隙率仅为0.32%,明显低于石英/钡酚醛的3.49%。Quartz/benzoxazine composite was fabricated by RTM process. The effect of process parameters on the porosities was investigated compared with those of quartz/barium-phenolic composite. Results show that injection pressure influence porosities of the composites significantly,better sequence of applying injection pressure is low pressure at early stage of the injection process and high pressure at later stage. Injection temperature influence porosities of the composites definitely,optimal injection temperature is the temperature in the range of which the resin viscosity maintains 100 to 500mPa·s. Porosities of composites decrease with the increase of fiber volume fraction. The effects of thickness of the samples on the porosities of the composites is not obviously. Porosities of quartz/benzoxazine composites are much lower than those of quartz/barium-phenolic composites at the same process condition. The porosities of quartz/benzoxazine composite and quartz/barium-phenolic composite reach 0.32% and 3.49% respectively at the given condition,at which applying injection pressure is 1atm at early stage and 4.5atm at later stage,the fiber volume fraction is 50%,the thickness of the composites are 6mm.

关 键 词：树脂传递模塑 苯并噁嗪 钡酚醛 孔隙率 工艺参数 

分 类 号：TB332[一般工业技术—材料科学与工程]