The internal friction of unidirectional CC composites fabricated in a magnetic field

✍ Scribed by Q. Shengru; Z. Shaorong; B. Shihong; S. Xiaoyan

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 440 KB
• Volume: 35
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/s0008-6223(96)00165-0

✦ Synopsis

Previous studies have shown that lamellae of mesophase pitch prefer to be oriented parallel to a magnetic field. In the present work the matrix mesophase layers of the C/C composites were oriented perpendicular to the carbon fibers by a 8000 G magnetic field. This study is concerned with the internal friction of unidirectional C/C composites produced by the method of the present research. It is found that the internal friction of unidirectional C/C composites fabricated with mesophase pitch precursor in a 8000 G magnetic field is larger than that of the composites in the absence of a magnetic field; the higher the degree of graphitization of the composites, the larger the internal friction of the composites; and the higher the density of the composites, the larger the internal friction of the composites. The internal friction of the C/C composites decrease with the oscillation frequency from 0.01 to 1 Hz, and then slightly increases up to 5 Hz.