KD-II型碳化硅纤维热输运性质的实验研究

doi:10.15541/jim20170429

无机材料学报 ›› 2018, Vol. 33 ›› Issue (7): 756-760.DOI: 10.15541/jim20170429 CSTR: 32189.14.10.15541/jim20170429

KD-II型碳化硅纤维热输运性质的实验研究

施徐国¹, 李明远², 马维刚¹, 周新贵², 张兴¹

1. 清华大学工程力学系, 热科学与动力工程教育部重点实验室, 北京 100084;
2. 国防科技大学新型陶瓷纤维及其复合材料重点实验室, 长沙 410073

收稿日期:2017-09-02 修回日期:2017-10-19 出版日期:2018-07-10 网络出版日期:2018-06-19
作者简介:施徐国(1990-), 男, 博士研究生. E-mail: sxg12@mails.tsinghua.edu.cn
基金资助:
国家自然科学基金重点项目(51327001) National Natural Science Foundation of China(51327001)

Experimental Study on Thermal Transport Property of KD-II SiC Fiber

SHI Xu-Guo¹, LI Ming-Yuan², MA Wei-Gang¹, ZHOU Xin-Gui², ZHANG Xing¹

1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100864, China;
2. Science and Technology on Advanced Ceramic Fiber and Composites Laboratory, National University of Defense Technology, Changsha 420073, China

Received:2017-09-02 Revised:2017-10-19 Published:2018-07-10 Online:2018-06-19
About author:SHI Xu-Guo. E-mail: sxg12@mails.tsinghua.edu.cn

摘要/Abstract

摘要：

SiC纤维是复合材料SiC_f/SiC中的组分材料, 其力学性能已经得到实验验证, 但热学性能尚未见报道。本研究采用综合T型法测量了不同温度热处理的KD-II型SiC纤维在80~300 K温度范围内的电导率、热导率和塞贝克系数, 热处理温度分别为1400、1500和1600℃。研究发现, 在实验设定的热处理温度范围内, SiC纤维电导率不随热处理温度改变而改变, 但其热导率随热处理温度升高有显著的变化。在环境温度为290 K时, 1600℃热处理的SiC纤维热导率为11.6 W•m^-1•K^-1, 比未热处理的材料提高了42%以上。

关键词: 碳化硅纤维, 热导率, 电导率

Abstract:

SiC fiber is a component material of SiC_f/SiC, its mechanical properties have been verified experimentally. In present work, the electrical conductivity, thermal conductivity and Seebeck coefficient of KD-II SiC fibers heat-treated at different temperatures were measured from 80 K to 300 K by a comprehensive T-type method. Heat treatment temperatures were 1400℃, 1500℃ and 1600℃, respectively. It is found that the electrical conductivity of SiC fiber does not change with the heat treatment temperature, however the thermal conductivity of SiC fiber is significantly enhanced as the heat treatment temperature increases. At the environment temperature of 290 K, the thermal conductivity of SiC fiber after heat-treated at 1600℃ is 11.6 W•m^-1•K^-1 , which is 42% higher than that of unheated SiC fiber.

Key words: SiC fiber, thermal conductivity, electrical conductivity

中图分类号:

O482

施徐国, 李明远, 马维刚, 周新贵, 张兴. KD-II型碳化硅纤维热输运性质的实验研究[J]. 无机材料学报, 2018, 33(7): 756-760.

SHI Xu-Guo, LI Ming-Yuan, MA Wei-Gang, ZHOU Xin-Gui, ZHANG Xing. Experimental Study on Thermal Transport Property of KD-II SiC Fiber[J]. Journal of Inorganic Materials, 2018, 33(7): 756-760.

图/表 6

图1 T型搭接示意图

Fig. 1 Schematic diagram of T-type assembling

表1 不同温度热处理的SiC纤维的尺寸信息

Table 1 Size details of SiC fibers heat-treated at different temperatures

Heat treatment temperature	Diameter/mm	Number of fibers	Length/mm
Unheated	12.00	130	5.31
1400℃	12.00	122	5.22
1500℃	12.00	152	4.83
1600℃	12.00	91	5.62

图2 SiC纤维的电导率随环境温度的变化曲线

Fig. 2 Change of electrical conductivity of SiC fibers with environment temperature

图3 SiC纤维的热导率随环境温度的变化曲线

Fig. 3 Change of thermal conductivity of SiC fibers with environment temperature

图4 SiC纤维的热导率随平均β-SiC尺寸的变化曲线

Fig. 4 Change of thermal conductivity of SiC fibers with size of average β-SiC

图5 SiC纤维的塞贝克系数随环境温度的变化曲线

Fig. 5 Seebeck coefficient of SiC fibers varies with environment temperature increasing

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KD-II型碳化硅纤维热输运性质的实验研究

Experimental Study on Thermal Transport Property of KD-II SiC Fiber

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