Response of 2D SiC/SiC Composites Resistivity to Service Environments

doi:10.15541/jim20210138

Abstract

Abstract:

The resistivity characteristics of 2D SiC/SiC composites were studied experimentally. In the oxygen-free environment, the resistivity increases when temperature decreases. With curve fitting, the mapping relationship between resistivity and temperature is established. After oxidation at 1300 ℃ in the air for 20 and 60 h, the conductivity of composites is greatly reduced due to the oxidation of the PyC interface and the SiC matrix. The degree of oxidation was characterized by the content of SiO₂, and the quantitative relationship between resistivity and oxidative damage was obtained. The changes in resistivity and stress with strain are similar. In the linear segment of stress-strain curve, with few matrix cracks the stiffness is almost unchanged, and the resistivity increases slowly. In the non-linear section, the resistivity rate and stiffness increase quickly because crack increases rapidly. They eventually stabilize when the increase in cracks slows down.

Key words: ceramic-matrix composites, electrical property, high-temperature property, mechanical property, damage mechanics

CLC Number:

TB332

WEI Tingting, GAO Xiguang, SONG Yingdong. Response of 2D SiC/SiC Composites Resistivity to Service Environments[J]. Journal of Inorganic Materials, 2022, 37(4): 420-426.

Figures/Tables 13

Fig. 1 Microstructures of 2D SiC/SiC composites specimen (a) Surfaces; (b) Side face; (c) Cross section

Fig. 2 SEM image (a) and EDS analysis (b) of the 2D SiC/SiC composites with surface scans of C (c), O (d) and Si (e)

Table 1 Details of the 2D SiC/SiC composites specimens

Number	Temperature/℃	Holding time/h	Dimension/mm
T1	1300	-	120×8
T2	1300	20	60×8
T3	1300	60	60×8
T4	-	-	120×12

Fig. 3 Diagram of the high-temperature system under inert gas environment

Fig. 4 Equipment of uniaxial tensile experiment of 2D SiC/SiC composites specimen

Fig. 5 2D SiC/SiC composites specimen

Fig. 6 Resistivity-temperature response of the 2D SiC/SiC composites

Fig. 7 Microstructures of the 2D SiC/SiC composites specimen after oxidation (a) Surface; (b) Side face

Fig. 8 SEM image and EDS analysis of the cross-section of the 2D SiC/SiC composites specimen after oxidation

Fig. 9 Relationship between resistivity and SiO2 content of the 2D SiC/SiC composites

Fig. 10 Response of resistivity and stress to strain of the 2D SiC/SiC composites

Fig. 11 Response of resistivity-rate and stiffness to strain of the 2D SiC/SiC composites

Fig. 12 Fracture micromorphologies of the 2D SiC/SiC composites specimen

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