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,2015,44(7):40-44,67.
SHI Yang-gu,HUANG Xiao-zhong,DU Zuo-juan,XU Shen-wei,LIAO Pan-xing,ZOU Yang-jun.Mechanical Properties and Surface Morphology of SiC Fibers Containing Beryllium[J].Surface Technology,2015,44(7):40-44,67
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
投稿时间:2015-03-28  修订日期:2015-07-20
DOI:10.16490/j.cnki.issn.1001-3660.2015.07.008
中文关键词:    碳化硅纤维  拉伸强度  表面形貌  耐高温  热处理
英文关键词:beryllium  SiC fibers  tensile strength  surface morphology  thermostability  heat treating
基金项目:国家高技术研究发展计划(863 计划,2013AA7024034)
作者单位
施旸谷 中南大学 物理与电子学院, 长沙 410083 
黄小忠 中南大学 航空航天学院, 长沙 410083 
杜作娟 中南大学 航空航天学院, 长沙 410083 
许慎微 中南大学 物理与电子学院, 长沙 410083 
廖潘兴 中南大学 物理与电子学院, 长沙 410083 
邹杨君 中南大学 航空航天学院, 长沙 410083 
AuthorInstitution
SHI Yang-gu School of Physics & Electronic, Central South University, Changsha 410083, China 
HUANG Xiao-zhong School of Aeronautics & Astronautics, Central South University, Changsha 410083, China 
DU Zuo-juan School of Aeronautics & Astronautics, Central South University, Changsha 410083, China 
XU Shen-wei School of Physics & Electronic, Central South University, Changsha 410083, China 
LIAO Pan-xing School of Physics & Electronic, Central South University, Changsha 410083, China 
ZOU Yang-jun School of Aeronautics & Astronautics, Central South University, Changsha 410083, China 
摘要点击次数:
全文下载次数:
中文摘要:
      目的 提高碳化硅纤维的高温力学性能。 方法 以含铍聚碳硅烷为原料,采用先驱体转化法制备含铍碳化硅纤维,对含铍碳化硅纤维进行 SEM 和 XRD 分析,并对其常温和高温力学性能进行测试。结果 制得的纤维直径在 20 ~30 μm,表面光滑,无明显缺陷。 纤维常温拉伸强度为 600 ~700 MPa,与商品级碳化硅纤维有较大差距,但在空气中 800 ℃加热 2 h 后,拉伸强度提升 30% 以上。 在空气中 1100 ℃加热 2 h 后,纤维表面形貌无明显改变,拉伸强度仍能保持90% 以上。 在空气中1200 ℃加热2 h 后,纤维表面出现裂纹,导致其拉伸强度明显下降。 普通 SiC 纤维的拉伸强度随着空气热处理温度的升高而不断下降,并且在相同的空气热处理温度下,其强度保留率明显低于含铍碳化硅纤维。 在空气热处理过程中,含铍碳化硅纤维表面生成了 SiO2 层,而普通碳化硅纤维却没有生成 SiO2。 结论 含铍碳化硅纤维在空气中具有优异的耐高温性能,原因是 Be 元素促使纤维表面的 SiC 氧化生成了 SiO2 保护层,一方面阻止了纤维内部材料被进一步氧化,另一方面对纤维表面起到了加强作用。
英文摘要:
      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 30 μm, 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.
查看全文  查看/发表评论  下载PDF阅读器
关闭

关于我们 | 联系我们 | 投诉建议 | 隐私保护 | 用户协议

您是第13543948位访问者    渝ICP备15012534号-3

版权所有:《表面技术》编辑部 2014 surface-techj.com, All Rights Reserved

邮编:400039 电话:023-68792193传真:023-68792396 Email: wjqkbm@163.com

渝公网安备 50010702501715号