Influence of cryogenic thermal cycling treatment on the thermophysical properties of carbon/carbon composites between room temperature and 1900 °C

doi:10.1016/j.jmst.2017.03.001

Abstract

Abstract:

Influence of cryogenic thermal cycling treatment (from -120 °C to 120 °C at 1.3 × 10^-3 Pa) on the thermophysical properties including thermal conductivity (TC), thermal diffusivity (TD), specific heat (SH) and coefficient of thermal expansion (CTE) ranging from room temperature to 1900 °C of carbon/carbon (C/C) composites in x-y and z directions were studied. Test results showed that fiber/matrix interfacial debonding, fiber pull-out and microcracks occurred after the cryogenic thermal treatment and they increased significantly with the cycle number increasing, while cycled more than 30 times, the space of microdefects reduced obviously due to the accumulation of cyclic thermal stress. TC, TD, SH and CTE of the cryogenic thermal cycling treated C/C composites were first decreased and then increased in both directions (x-y and z directions) with the increase of thermal cycles. A model regarding the heat conduction in cryogenic thermal cycling treated C/C composites was proposed.

Key words: Carbon/carbon composites, Cryogenic thermal cycling, Thermal conductivity, Thermal expansion

Mao-yan Zhang, Ke-zhi Li, Xiao-hong Shi, Ling-jun Guo, Lei Feng, Tao DuanState. Influence of cryogenic thermal cycling treatment on the thermophysical properties of carbon/carbon composites between room temperature and 1900 °C[J]. J. Mater. Sci. Technol., 2018, 34(2): 409-415.

Figures/Tables 10

Fig. 1. Schematic models of needle-punched preforms (a) and the thermal flux through C/C composites in x-y (b) and in z (c) directions.

Fig. 2. The porosity of C/C composite after different cryogenic thermal cycles.

Fig. 3. XRD patterns of C/C composites after different cryogenic thermal cycles.

Table 1 Parameters peak (002) of C/C composites after different cryogenic thermal cycles.

Sample	2θ (deg.)	d₀₀₂ (nm)
Unexposed	26.382	3.37563
10 thermal cycles	26.426	3.37000
30 thermal cycles	26.543	3.35550
50 thermal cycles	26.382	3.37563
100 thermal cycles	26.382	3.37563

Fig. 4. Thermal conductivity of the C/C composites after different cryogenic thermal cycles: (a) in x-y direction, (b) in z direction.

Fig. 5. Thermal diffusivity of C/C composites after different cryogenic thermal cycles: (a) in x-y direction, (b) in z direction.

Fig. 6. Specific heat of C/C composites after different cryogenic thermal cycles: (a) in x-y direction, (b) in z direction.

Fig. 7. Schematic model of the heat conduction in C/C composites after different cryogenic thermal cycles at elevated temperature.

Fig. 8. CTE of C/C composites after different cryogenic thermal cycles at elevated temperature: (a, c) in x-y direction, (b, d) in z direction.

Fig. 9. SEM images of C/C composites after different cryogenic thermal cycles in x-y (a1, b1, c1, d1, e1) and in z (a2, b2, c2, d2, e2) directions: (a1, a2) unexposed; (b1, b2) 10 thermal cycles; (c1, c2) 30 thermal cycles; (d1, b2) 50 thermal cycles; (e1, e2) 100 thermal cycles.

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