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Gas leakage through C/C composite and its suppression technology

C/C复合材料漏气及其抑制技术

基本信息

批准号：
16360338
负责人：
HATTA Hiroshi
金额：
$ 7.87万
依托单位：
Japan Aerospace Exploration Agency
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360338/
关键词：
C C composite Gas leakage Air tight chamber Thermal expansion mismatch Crack Si impregnation Sol-gel method CVI

项目摘要

Carbon fiber reinforced carbon matrix composites (C/Cs) are porous materials including voids, cracks, and interfacial debonding between the fiber and matrix. Hence, in applications of C/Cs to airtight hot structures such as heat exchangers, the gas leakage becomes serious problem. However, within author's best knowledge, few studies has treated this problem, and essentially no discussion has been performed on gas leak mechanisms and measures to minimize gas leak rate.In the present study, the following discussion was performed ;1. A test fixture capable of high temperature measurement of gas leak rates was designed, and fabricated.2. In order to fill the defects in C/Cs, molten Si was infiltrated, and filled Si was converted to SiC by chemical reaction with carbon in C/Cs.3. Cracks in C/Cs have tendency to be closing with temperature rise, so that additional measures which can be done under low temperature environment were attempted.The results obtained in the present research were as follows ;1. A test fixture capable of high temperature gas leak rate measurements up to 800゜C of gas leak rates was designed, and fabricated.2. The Si impregnation resulted in decreasing gas leak rate to 1/10.3. As low temperature methods, carbon infiltration by HIP (hot isostatic pressure), glass formation by the sol-gel method, and glass coating by the sol-gel method were examined after the Si impregnation. The first method resulted in slight lowering of gas leak rate, the second and third treatments yielded less gas leak rates over 1/10 compared with Si impregnated C/Cs. Thus, this study established technology lowering gas leak rate through C/Cs less than 1/1000 compared with non-treated C/Cs.

碳纤维增强碳基复合材料（C/Cs）是一种多孔材料，纤维与基体之间存在孔隙、裂纹和界面脱粘。因此，在将C/C应用于诸如热交换器的气密热结构中时，气体泄漏成为严重问题。然而，据作者所知，很少有研究处理这个问题，基本上没有讨论气体泄漏的机制和措施，以尽量减少气体泄漏率。设计并制作了能够高温测量气体泄漏率的测试夹具。2.为了填充C/Cs中的缺陷，对Si进行熔渗，填充的Si与C/Cs中的碳发生化学反应转化为SiC. C/C复合材料中的裂纹有随温度升高而闭合的趋势，因此在低温环境下可以采取的附加措施在本研究中得到了如下结果：1.设计并制造了一种能够测量高达800 ℃气体泄漏率的高温气体泄漏率测试夹具. Si浸渍导致气体泄漏率降低至1/10.3。作为低温方法，在Si浸渍之后，研究了通过HIP（热等静压）的碳渗透、通过溶胶-凝胶法的玻璃形成和通过溶胶-凝胶法的玻璃涂覆。第一种方法导致气体泄漏率略有降低，第二和第三种处理产生的气体泄漏率比浸渍Si的C/Cs小1/10以上。因此，本研究建立了与未处理的C/Cs相比，通过C/Cs的气体泄漏率降低到1/1000以下的技术。

项目成果

期刊论文数量（8）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Key C/C technologies required for building up an engine structure for a reusable space vehicle

建造可重复使用航天器发动机结构所需的关键 C/C 技术

DOI：
发表时间：
2005
期刊：
Proc. USA France and Japan Carbon-Carbon Composites Technology Exchange Workshop CD ROM
影响因子：
0
作者：
Yoshisato Kimura;Akihisa Zama;Hiroshi Hatta
通讯作者：
Hiroshi Hatta

Prevention of Gas Leakage through C/C Composites by Si Impregnation

通过浸硅防止 C/C 复合材料气体泄漏