表面技术Issue(7)：40-44,67,6.DOI:10.16490/j.cnki.issn.1001-3660.2015.07.008
含铍碳化硅纤维的力学性能及其表面形貌研究
Mechanical Properties and Surface Morphology of SiC Fibers Containing Beryllium
摘要
Abstract
ABSTRACT:Objective To improve the mechanical properties of SiC fibers. Methods PBeCS was used as the precursor, and SiC fibers containing beryllium were produced by polymer-derived method. SEM, XRD and tensile strength tests were carried out. Results SiC fibers containing beryllium had a diameter between 20 to 30μm, and their surface was smooth. With a tensile strength of 600~700 MPa, the fibers were not as good as the current commercial SiC fibers, however, after being treated under 800 ℃ for 2 h in the air, SiC fibers containing beryllium had an increase of over 30% on tensile strength, and without obvious changes in sur-face morphology. These fibers kept more than 90% strength after being treated at 1100 ℃ for 2 h in the air. However, after being treated at 1200 ℃ for 2 h in the air, cracks appeared on the surface of the fibers, along with a sharp decrease of tensile strength. When the temperature of heat treating rose, the tensile strength of ordinary SiC fibers kept decreasing which was always lower than that of SiC fibers containing beryllium. During the heat treatment in the air, a SiO2 layer appeared on the surface of Be-SiC fibers, but not on the surface of ordinary SiC fibers. Conclusion The reason for good mechanical properties of SiC fibers containing berylli-um under high temperature in the air may be that beryllium caused the oxidation of SiC to generate SiO2 on the surface of fibers, which prohibited inner materials from being oxidized, and meanwhile strengthened the surface of the fibers.关键词
铍/碳化硅纤维/拉伸强度/表面形貌/耐高温/热处理Key words
beryllium/SiC fibers/tensile strength/surface morphology/thermostability/heat treating分类
化学化工引用本文复制引用
施旸谷,黄小忠,杜作娟,许慎微,廖潘兴,邹杨君..含铍碳化硅纤维的力学性能及其表面形貌研究[J].表面技术,2015,(7):40-44,67,6.基金项目
国家高技术研究发展计划(863计划,2013AA7024034) Fund：Supported by the National High Technology Research and Development Program (2013AA7024034) （863计划,2013AA7024034）
