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厚壁碳/酚醛复合材料热压罐固化工艺优化
马飞, 杨雯, 梁希凤
西安航天复合材料研究所, 西安 710025
摘要:
厚壁碳/酚醛复合材料在固化过程中容易产生较大的温度梯度,造成固化不均匀。为了解此类产品在固化过程中内部的温度变化和分布,通过在产品内部预埋热电偶的方式,开展了温度监测实验。同时采用DSC及凝胶实验对树脂的固化特性进行了分析。结果表明:在初期阶段的升温过程中,产品内部温度远低于罐体内的温度;酚醛树脂随着温度的升高,流动性能变好,在95~100℃时开始凝胶,出现聚合放热现象。依据以上实验结果对固化工艺进行了优化,主要包括延长各温度点的保温时间、延缓初期的升温速率、调整加全压的时机、增加树脂凝胶温度点的保温段。最后对优化后的固化工艺进行了验证,结果表明优化后的固化工艺合理,产品经超声波检测,内部缺陷大大减少,质量均一性得到了有效提高。
关键词:  热压罐  碳/酚醛  固化工艺  超声波检测  缺陷
DOI:10.12044/j.issn.1007-2330.2017.03.012
分类号:TB3
基金项目:
Optimize Curing Process in Autoclave of Thick Wall Carbon Fibers/Phenolic Composite
MA Fei, YANG Wen, LIANG Xifeng
Xi'an Aerospace Composites Research Institute, Xi'an 710025
Abstract:
A great temperature gradient easily occurred in the curing process of the thick wall carbon fibers/phenolic composite, usually caused an uneven curing.This paper focused on the research of temperature change inside this kind of product during curing through a temperature monitoring experiment by immersion a thermocouple inside of the product. Meanwhile, the curing reaction behavior of phenolic was studied by DSC technique and gel test. Experimental results showed that internal temperature of product was much belower than inside of autoclave during the early stage of raising temperature.The resin flew better with increase of temperature, and exothermic polymerization began when the resin gel at 95℃ to 100℃.Then the curing system is optimized according to the experiment results,including extend holding time of each temperature,delay the heating rate at early time,adjust the time of total pressure and increase preservation at gel.In the end,the verification is conducted.The results show that optimized curing system is reasonable,a great decrease of defect is confirmed by ultrasonic detector and the quality uniformity of product is improved effectively.
Key words:  Autoclave  Carbon Fibers/Phenolic  Curing system  Ultrasonic detector  Defect