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

doi:10.15541/jim20170429

Abstract

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

CLC Number:

O482

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.

Figures/Tables 6

Fig. 1 Schematic diagram of T-type assembling

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

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

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

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

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

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