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环境温湿度对低密度烧蚀材料施工窗口的影响
罗丽娟, 梁馨, 毛科铸, 唐一壬, 方洲
航天材料及工艺研究所, 北京 100076
摘要:
为了研究环境温湿度对低密度烧蚀材料施工窗口的影响,将低密度预混料在室内放置不同的时间后,再对其进行后续的灌注、固化、加工等处理,进而讨论基体黏度对烧蚀材料的宏观微观形貌及施工工艺的影响。结果表明:基体黏度随放置时间的增加而增加,且有拐点,拐点后环境温湿度对基体的黏度影响更加显著,温湿度越大,基体黏度增大越快;拐点前后灌注的低密度材料的密度、宏观形貌没有明显差别,但拐点前灌注的材料填料在树脂中分布均匀,树脂充分浸润填料,而拐点后灌注的材料填料分布不均匀,树脂不能充分浸润填料,存在孔隙。说明低密度预混料应在基体黏度拐点前进行灌注,环境温度湿度越大,施工窗口越短,反之亦然。
关键词:  温湿度  蜂窝增强低密度烧蚀材料  施工窗口  黏度  灌注  宏观形貌  微观形貌
DOI:10.12044/j.issn.1007-2330.2018.06.010
分类号:TB332
基金项目:
Effect of Environmental Temperature and Humidity on Operation Period of Low Density Ablator
LUO Lijuan, LIANG Xin, MAO Kezhu, TANG Yiren, FANG Zhou
Aerospace Research Institute of Materials & Processing Technology, Beijing 100076
Abstract:
In order to investigate the influence of environmental temperature and humidity on operation period of low density ablator, the low density prefabrication has been perfused, cured and manufactured after placing in different times under the indoor situation, and further discussed the influences of viscosity on micro and macro appearances of ablator and process technologies.The results show that the viscosity is increasing with the temperature and humidity, and there is an inflexion point in this process. The humidity and temperature have more impact on viscosity after the inflexion point.The higher temperature and humidity are, the higher rising rate will be.The densities and macro appearance around inflexion point has no clear distinction. The fillers are uniform distributed and fully infiltrated by the resin before the inflexion point.Conversely, the fillers are uneven distributed and partly infiltrated, and the resin remains in micro-pores after the inflexion point. Therefore, the prefabrication must be perfused into honeycomb before the viscosity of resin reached its inflexion. The higher temperature and humidity are, the shorter operation period is.And the reverse is also true.
Key words:  Temperature and humidity  Honeycomb reinforced low density ablator  Operation period  Viscosity  Perfuse  Macro morphology  Micro morphology