Influence of High Temperature Treatment of C/C Porous Preform on Friction and Wear Behavior of C/C-SiC Composites

doi:10.15541/jim20220555

Abstract

Abstract:

Controlling the structure and properties of low-density C/C porous preforms is the key to the preparation of C/C-SiC composites with excellent friction and wear properties. In this study, C/C porous preforms prepared by chemical vapor infiltration were subjected to high temperature heat-treatment at 2100 ℃. C/C-SiC composites were prepared by reactive melt infiltration. Effects of high temperature heat-treatment of C/C porous preforms on microstructures, thermal properties and tribological properties of C/C-SiC composites were investigated. The results showed that the porosity and graphitization degree of the C/C porous performs increased after high temperature heat-treatment at 2100 ℃. The C/C-SiC composites have a higher density (2.22 g/cm³), and the porosity is reduced from 5.1% to 3.4%, the phase content of SiC ceramic is increased by 11.9%. The mean free path of phonons is larger when C/C porous preforms have a higher degree of graphitization, resulting in thermal conductivity at room temperature being increased by 2.1 times, and the thermal conductivity at 1200 ℃ being increased by 0.2 times. Wear surface of C/C-SiC composites forms a continuous and stable friction film, which is attributed to the fact that the PyC after high temperature treatment is softer and easier to be extruded into a film. Thus, the friction coefficient is more stable, and the wear rate is reduced under the test loads of 3, 6 and 9 N, by 47.8%, 41.9% and 11.7%, and the average friction coefficients are 0.47, 0.38 and 0.39, respectively. Therefore, high temperature heat-treatment of the C/C porous preforms can improve the thermal conductivity of the C/C-SiC composites, which exhibits a more stable friction coefficient and more wear-resistant.

Key words: C/C-SiC composites, high temperature treatment, thermal conductivity, friction, wear resistance

CLC Number:

TB332

ZHANG Shuo, FU Qiangang, ZHANG Pei, FEI Jie, LI Wei. Influence of High Temperature Treatment of C/C Porous Preform on Friction and Wear Behavior of C/C-SiC Composites[J]. Journal of Inorganic Materials, 2023, 38(5): 561-568.

Figures/Tables 11

Fig. 1 SEM images of porous C/C preform (a) Not graphitized; (b) After heat-treatment at 2100 ℃

Fig. 2 Analysis of PyC crystal in porous C/C preform (a) XRD patterns; (b) Raman spectra; (c, d) Raman fitting spectra of (c) sample C/C and (d) sample C/C (2100 ℃)

Table 1 XRD diffraction peaks, graphitization degrees, and Raman spectral fitting results of porous C/C preform

Sample	2θ_C(002)/(°)	g/%	I_D/I_G	A_G/A_T
C/C	25.501	-60.93	1.19	0.20
C/C(2100 ℃)	26.162	41.74	0.44	0.31

Fig. 3 Microphologies and BSE images of C/C-SiC composites (a, c) Sample C/C-SiC; (b, d) Sample C/C (2100 ℃)-SiC

Table 2 Densities and porosities of the C/C and C/C-SiC composites

Sample	Density/(g·cm^-3)	Porosity /%
C/C	1.45	18.9
C/C(2100 ℃)	1.41	21.9
C/C-SiC	2.13	5.1
C/C(2100 ℃)-SiC	2.22	3.4

Fig. 4 Phase analyses of C/C-SiC composites (a) XRD pattern; (b) Quantitative analyses

Fig. 5 Relations of thermal properties to temperature of C/C-SiC composites on Z direction (a) Specific heat capacity; (b) Thermal conductivity; (c) Thermal diffusivity

Fig. 7 SEM images of C/C-SiC composites grinding defect under different loads (a-c) Sample C/C-SiC under (a) 3 N, (b) 6 N, (c) 9 N loads; (d-f) Sample C/C(2100 ℃)-SiC under (d) 3 N, (e) 6 N, (f) 9 N loads

Fig. 6 Friction coefficient of C/C-SiC composites (a) Variation of friction coefficient with time under different loads; (b) Average coefficient of friction under different loads

Fig. 8 Wear rate of C/C-SiC composites under different loads

Fig. 9 SEM images of C/C-SiC composites grinding defect under different loads (a, b) Sample C/C-SiC under (a) 3 N, (b) 9 N loads; (c, d) Sample C/C(2100 ℃)-SiC under (c) 3 N, (d) 9 N loads

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