火箭推进

通过对不同温度条件下，水氧腐蚀前后2D C/SiC复合材料热扩散性能的演变规律，研究了环境损伤对C/SiC复合材料热扩散性能的作用机制。在水蒸气和氧气混合环境下，C/SiC复合材料内部气孔率增加，同时在材料表面有氧化物形成。材料内部出现的气孔，阻断了热流在材料内部的传输，使得热扩散性能呈现出直线下降的趋势。氧化物的形成，在一定程度上封填裂纹，有助于热量的传输，能够在一定程度上改善材料热扩散性能。

The effect of environmental corrosion on thermal diffusivity of 2D C/SiC composites is investigated by the microstructural evolution of water vapor and oxygen corrosion under the conditions of different temperatures. In the water vapor and oxygen mixture environment, the porosity increases and the oxide forms in the composites. The pores inside the composites interrupts the heat flow transmission, which results in almost linear reduction of thermal diffusivity of composites. The oxide forming at high corrosion temperature fills up the matrix cracks, which is conducive to thermal transmission and can improve the thermal diffusivity in the composites.

引言
1 实验过程
2 结果与讨论
3 结论

图1 不同实验温度下C/SiC 复合材料气孔率和氧含量随实验温度的变化<br/>Fig.1 Variation of porosity and oxygen content of C/SiC samples with test temperatures

图1 不同实验温度下C/SiC 复合材料气孔率和氧含量随实验温度的变化
Fig.1 Variation of porosity and oxygen content of C/SiC samples with test temperatures

图2 不同温度腐蚀后C/SiC 热扩散性能随测试温度的变化趋势<br/>Fig.2 Variation trend of thermal diffusivity of corroded C/SiC with testing temperatures

图2 不同温度腐蚀后C/SiC 热扩散性能随测试温度的变化趋势
Fig.2 Variation trend of thermal diffusivity of corroded C/SiC with testing temperatures

图3 水氧腐蚀后C/SiC 复合材料热扩散性能随实验温度的变化<br/>Fig.3 Variation of thermal diffusivity of corroded C/SiC composites with test temperatures

图3 水氧腐蚀后C/SiC 复合材料热扩散性能随实验温度的变化
Fig.3 Variation of thermal diffusivity of corroded C/SiC composites with test temperatures

图4 C/SiC试样热扩散系数随气孔率的变化关系<br/>Fig.4 Variation of thermal diffusivity of corroded C/SiC samples with porosity

图4 C/SiC试样热扩散系数随气孔率的变化关系
Fig.4 Variation of thermal diffusivity of corroded C/SiC samples with porosity

图5 700 ℃水氧腐蚀后C/SiC内部孔洞结构<br/>Fig.5 Pores microstructure inside C/SiC sample corroded at 700 ℃

图5 700 ℃水氧腐蚀后C/SiC内部孔洞结构
Fig.5 Pores microstructure inside C/SiC sample corroded at 700 ℃

图6 1 000 ℃和1 300 ℃水氧腐蚀后C/SiC 试样表面形貌<br/>Fig.6 Surface morphologies of C/SiC samples corroded at 1 000 ℃ and 1 300 ℃

图6 1 000 ℃和1 300 ℃水氧腐蚀后C/SiC 试样表面形貌
Fig.6 Surface morphologies of C/SiC samples corroded at 1 000 ℃ and 1 300 ℃

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备注

引言

1 实验过程

2 结果与讨论

3 结论

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