Abstract：Preparation of polymer-derived SiC fibers involves a pyrolysis process, in which great weight loss and shrinkage are usually recorded. As a result, stress concentrates on the bend portion of the fibers and then lower their tensile strength. To avoid the bend portion and stress concentration, a pyrolysis under tension, as well as their effect on the tensile behavior of SiC yarns was studied. Results revealed that so-obtained SiC fibers are straight and parallel to each other. The crack load of SiC yarns is much increased, or in another word, their weave capability is much improved.
[1] 楚增勇, 冯春祥, 宋永才,等. 先驱体转化法连续SiC纤维国内外研究与开发现状[J]. 无机材料学报, 2002,17:193-202. [2] Z Y Chu, C X Feng, Y C Song, et al. Influence of firing tension on the mechanical properties of polymer-derived SiC fibers[A]. proceedings of ICCM-13[C]. Beijing, 2001. [3] Z Y Chu, C X Feng, Y C Song, et al. Tensile strength evaluation of a polymer-derived multifilament continuous SiC fiber[A]. proceedings of ISM2E-YS[C]. Changsha, 2001. [4] Z Y Chu,et al. Enhanced irradiation cross-linking of polycarbosilane[J]. J Mater Sci Lett, 1999, 18:1793-1795. [5] Z Y Chu, Y D Wang, C X Feng, et al. Effect of spinning techniques on the mechanical properties of polymer-derived SiC fiber[J]. Key Eng Mater, 2002,224-226:651-656. [6] Y Hasegawa, M Limura, S Yajima. Synthesis of continuous silicon carbide fiber with high tensile strength and high Young′s modulus[J]. J Mater Sci, 1980, 15:720-728. [7] J Lipowitz, J A Rabe, L K Frevel, R L Miller.J Mater Sci, 1990, 25:2118-2124.
2003, Vol. 0 
