碳/碳复合材料吸油和去油特性研究

 以航空十号液压油(YH-10)为介质研究了碳/碳复合材料的吸油和去油特性,提出了其吸油机理,确定了吸油和去油过程中试环内油含量与时间关系的拟合方程。通过实验表明,在室温下碳/碳复合材料在浸油开始阶段随着时间的延长吸油率迅速上升,随后增加缓慢,最后趋于饱和并不再变化,饱和吸油率为4％左右。在去油过程中,碳/碳复合材料残油率受温度、时间和加热方式控制,而温度和加热方式是主导因素。在一定温度下,材料残油率随时间基本呈线性降低。当温度由100℃提高到150℃,残油率减小不大,而在200℃时残油率大幅度降低。200℃以上的温度是去除其油液的合适温度。微波炉加热较烘箱保温具有更好的去油效果。采用偏光显微镜和扫描电镜分析了碳/碳复合材料浸油和去油后的微观组织。

Characteristics of Oil Absorption and Desorption on C/C Composites

The characteristics of oil absorption and desorption on carbon-carbon composites is researched using hydraulic fluid (type YH-10).The mechanism of oil absorption is put forward. The relationships between oil amount in the specimens and time are established. The test results show that the oil absorption rate in carbon-carbon composites is rapidly increased in the beginning term of the immersion process and slowed-up subsequently, and ultimately reaches saturation value of about 4%. In the process of desorption, the residual oil amount in carbon-carbon composites is dominated by the temperature, time and heating method. But the temperature is the dominant factor. Higher the temperature is, the better the clearing effect is. The residual oil amount in carbon-carbon composites is much smaller at 200℃ than that at 100℃. However, the residual oil amount in them has little change when the temperature is raised from 100℃ to 150℃, which suggests that there is a limitation temperature to remove the residual oil from the interior of carbon-carbon composites. Over 200℃ is suitable to the oil desorption in the interior of the composites. The effect of removing oil is better using microwave heating than using the oven heating. The microstructures of specimens are analyzed by the polarization microscope and scanning electron microscope.