Effect of oxygen content on tensile strength of polymer-derived SiC fibers

来源期刊：中国有色金属学报(英文版)2002年第5期

论文作者：楚增勇 冯春祥 宋永才 王应德 李效东 肖加余

文章页码：894 - 898

Key words：SiC fiber; oxygen content; mechanical property; polymer-derived ceramic

Abstract: Air-curing is usually applied to the polymer-derived SiC fibers and, as a result, oxygen is embedded to the material. An effective relationship between oxygen content of the SiC fibers and mass gain of their precursor fibers was established. Results also showed that oxygen content has a great influence on the mechanical properties and excellent tensile strength is usually obtained at the oxygen content of 12%~13%, similar to the density of SiC fibers. Oxygen content has a positive effect on the ceramic yield, and thus, is good to the density and tensile strength; while, oxygen content is also negative to volume content of SiC phase and crystallization of the SiC fibers, and thus, detrimental to the density and tensile strength. Both of the two effects result in the peak behavior of the tensile strength of SiC fibers.