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The development research to toughness of SiC/SiC composites by the interface control.

界面控制对SiC/SiC复合材料韧性的发展研究

基本信息

批准号：
10650682
负责人：
SATO Shinji
金额：
$ 2.24万
依托单位：
Fukushima National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650682/
关键词：
SiC fiber SiC SiC composite CVI Carbon coating Bending test Strength characteristic Interfacial shear sliding strength Microstructure 界面制御複合材料開発 CVI法

项目摘要

It was examined that the strength of the fiber was effectively manifested in order to improve the strength characteristic of SiC/SiC composite. Therefore, the interface between fiber and matrix was coated with carbon and BN, and the research which controlled the interface combination was carried out. The SiC fiber used the Hi- Nicalon fiber of the filament. The CVI method was used in the material manufacture. The SiC/SiC composite material was produced using CィイD22ィエD2HィイD25ィエD2ClィイD23ィエD2Si in the raw material gas at about 1000℃. Though the material produced at the initial stage was a shape of the 40mm diameter, it was possible that it was the 120mm diameter afterwards and produces the large material of the 2mm thickness.The result got in this study in the following is shown.(1)Fiber volume fraction of produced SiC/SiC composite material was 35%, and the volume density was about 2.4g/cmィイD13ィエD1, and the material of which the uniform thickness was good was got.(2)It became possible that the carbon coat was made from number 10μm to number 1000μm in the fiber surface.(3)The interface between fiber and carbon coat was analyzed in high resolution electron microscope observation and EPMA analysis. As the result, it was proven that the crack progressed the interface.(4)The value which was the highest in the carbon 1.0μm coating thickness time was obtained the material bending strength which coated the carbon. It was possible to understand this from the relationship between interfacial shear sliding strength and strength of the matrix.(5)Formation of the carbon coat is necessary for the strengthening of the SiC/SiC composite. And, it was proven that the ductility also increased.From the above fact, the development of the SiC/SiC composite was possible. In the future, further developability is desired the SiC/SiC composite as a high temperature high-intense material.

结果表明，纤维的强度得到了有效的体现，从而提高了SiC/SiC复合材料的强度特性。为此，在纤维与基体的界面上涂覆碳和BN，并对界面结合进行控制研究。SiC纤维采用了Hi-Nicalon纤维的长丝.材料制备采用CVI方法。在1000℃左右的原料气中，用C ↓ [2] D ↓ [22] D ↓ [2 H] D ↓ [25] D ↓ [2Cl] D ↓ [23] D ↓ [2Si]制备了SiC/SiC复合材料。虽然在初始阶段生产的材料是直径为40 mm的形状，但它有可能是120 mm的直径，并产生2 mm厚的大材料。（1）制备的SiC/SiC复合材料纤维体积分数为35%，体积密度为2.4g/cm ~ 3·d ~（13）·d ~（11），厚度均匀性好。(2)It使纤维表面10μm ~ 1000μm的碳涂层成为可能。（3）用高分辨电子显微镜和电子探针分析了纤维与碳涂层的界面。结果表明，裂纹是沿界面扩展的.（4）在碳涂层厚度为1.0μm的时间段内，涂层材料的抗弯强度最高。这可以从界面剪切滑动强度与基体强度之间的关系来理解。（5）碳涂层的形成对于SiC/SiC复合材料的强化是必要的。同时，也证明了SiC/SiC复合材料的塑性也得到了提高，这为SiC/SiC复合材料的开发提供了可能。SiC/SiC复合材料作为一种高温高强度材料，具有进一步发展的前景。