Mechanical Properties of Carbon Fiber / Ceramic Composites Prepared from Borosiloxane with High Boron Content

Autor:	Sugio Otani, Yasuaki Nakaido, Yoshio Hasegawa, Shinsuke Hoshii, Akira Kojima, Hirohisa Endou, Tasuku Satou
Rok vydání:	1993
Předmět:	Thermogravimetric analysis Materials science Composite number Infrared spectroscopy Diphenylsilanediol chemistry.chemical_element Boric acid chemistry.chemical_compound chemistry Flexural strength visual_art visual_art.visual_art_medium Ceramic Composite material Boron
Zdroj:	TANSO. 1993:29-36
ISSN:	1884-5495 0371-5345
Popis:	To prepare diphenylborosiloxane (PBS) from diphenylsilanediol and boric acid in two ways, their mole ratio (Si/B) was set at 3/1 and 3/2. Infrared absorption spectrascopy, thermogravimetric analysis, and determination of average molecular weight by GPC were performed on the PBS obtained. Molecular weight and Si content of the synthesized PBS differed with the mole ratios of materials. For the ratio of Si/B=3/1, molecular weight was 513 and Si content was 10.5wt%, while that was 610 and 8.7wt% for the ratio of Si/B=3/2. Weight loss when heated at 1000°C in the air was 59% and 70% respectively.CF/ceramic composites were prepared from PBS (Si/B=3/2) and CF, where the relation between their preparation conditions and mechanical strength was studied. Composite with the highest strength had the bulk density of 1.46g/cm3, the bending strength of 250MPa, and the Young's modulus of 24GPa. Microscopic observation of their sections by SEM indicated that increase of boron caused the formation of viscous vitreous matrix, which closely adhered to CF. X-ray diffractometry gave a diffraction pattern for B2O3 as well as those for carbon and SiC.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::80eac4af556fc90938184a490692bb27 https://doi.org/10.7209/tanso.1993.29 Zobrazit plný text záznamu