基于DSC法的混杂纤维增强树脂基复合材料拉挤工艺研究

为提高碳纤维/玻璃纤维混杂增强树脂基复合材料(以下简称混杂纤维复合材料)拉挤型材的固化质量和力学性能,通过差示扫描量热分析(DSC)法,得出了相同配方条件下复合材料的4种不同升温速率下的固化DSC曲线,运用T–β外推法初步确定了三段式加热拉挤成型方法的温度工艺参数范围。在此基础上,选择直径为10 mm的混杂纤维棒材作为研究对象,变化不同的拉挤温度和速度制备型材,并对其分别进行力学性能试验,研究拉挤工艺参数对复合材料力学性能的影响,从而根据力学性能表征进一步明确适合于本配方的生产工艺参数。结果表明,通过以上方法所得到的混杂纤维复合材料拉挤工艺参数能够满足制备混杂纤维复合材料型材的要求;与传统的经验方法相比,采用该方法更为高效和准确。

Study on Pultrusion Technology for Hybrid Fiber Reinforced Composites Based on DSC

In order to improve the curing effect and mechanical properties of pultruded carbon/glass hybrid fiber reinforced composit(e hereinafter referred to shortly as hybrid fiber composite)profiles,the Differential Scanning Calorimetr(y DSC) technology was introduced and the curing DSC curves for the hybrid fiber composites with same formula at 4 different heating rates were attained.Then the ranges of the processing temperature for the three-stage heating pultrusion was primarily determined with T–β method.Subsquently a kind of hybrid fiber composite rods with a diameter of 10 mm was selected as the research object based on this,and they was manufactured with varies of processing temperatures and speeds.Then the mechanical property tests of the rods were proceeded respectively to inverstigate the effects of processing parameters on the mechanical property of the composite,so the processing parameter ranges fitting to this composite formula were further accertained according to the mechanical property tests.The results showed that the pultrusion processing parameters for the hybrid fiber composites acquired through the above method could satisfy the require of manufacturing hybrid fiber composite profiles,compared with the traditional method,the method for attaining processing parameters was more efficiency and accurate.