| 摘要: |
| 采用细编穿刺预制体、有机铪前驱体和沥青，利用化学气相沉积法（CVD）结合前驱体浸渍裂解（PIP）的工艺制得C/C-HfC复合材料，研究了C/C-HfC复合材料的导热性能和热膨胀性能，分析了温度和HfC基体含量对该材料不同方向热物理性能的影响。研究结果表明：C/C-HfC复合材料的比热容随着温度的升高不断增大，C/C-HfC复合材料的热扩散系数随着温度的升高不断减小，HfC含量增加使该材料热扩散系数增大，C/C-HfC复合材料的导热系数随着温度的升高和HfC基体含量增加而增大，HfC含量45.6%的C/C-HfC复合材料在900℃时导热系数最大，X-Y向导热系数为(28.0±1.5)W?m-1?K-1，Z向导热系数为(16.6±0.9)W?m-1?K-1；C/C-HfC 材料的线膨胀系数随着温度的升高和HfC基体含量增大而增大，HfC含量45.6%的C/C-HfC复合材料在1000℃时线膨胀系数最大，X-Y向线膨胀系数为(1.61±0.1)?10-6?K-1，Z向线膨胀系数为(2.86±0.2)?10-6?K-1。 |
| 关键词: C/C-HfC复合材料 HfC基体含量 导热系数 线膨胀系数 |
| 基金项目: |
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| Thermalphysical Properties and Its Influence Factors of C/C-HfC Composites |
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Shi Lin1, Yang Liu1, Gou Dan2, Xiao Shanshan1, Wang Hang2
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1. Xi’an Aerospace Composite Research Institute, Xi’an 710025;2. Xi’an Chaoma Technology Co. Ltd., Xi’an 710025
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| Abstract: |
| In this work, a seris of C/C-HfC composites were successfully fabricated by chemical vapor deposition (CVD), and precursor infiltrations andpyrolysis (PIP) methods step by step, based on fine weave pierced preform, ZrC precursor and asphalt. The effects of temperature and HfC content on the thermophysical properties in different directions, i.e., thermal conduction property and coefficient of thermal expansion, of C/C-HfC composites were deeply investigated. The specific heat capacity of fine weave pierced C/C-HfC composites increased with temperature. The thermal diffusivity of fine weave pierced C/C-HfC composites decreased when temperature increase but increased when HfC content increase; The thermal conductivity and the coefficient of thermal expansion of fine weave pierced C/C-HfC composites increased as temperature rising. Finally, at 900℃, the C/C-HfC composites with 45% HfC content reached the highest thermal conductivity X-Y thermal conductivity of (28.0±1.5)W?m-1?K-1 and Z thermal conductivity of (16.6±0.9)W?m-1?K-1 and the highest coefficient of thermal expansion(1.61±0.1)?10-6?K-1 in X-Y plane and (2.86±0.2)?10-6?K-1 along Z axis. |
| Key words: C/C-HfC composite HfC content thermal conductivity coefficient of thermal expansion |
