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Possibilities of Using Low-Density C–C Composites for Thermal Protection of Small Unmanned Aerial Vehicles


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Figure 1.

Viscose fibre general appearance and chemical formula.
Viscose fibre general appearance and chemical formula.

Figure 2.

CFC based on viscose. CFC, carbonised carbon fibres.
CFC based on viscose. CFC, carbonised carbon fibres.

Figure 3.

Appearance of viscose fibre before crushing, ×2.
Appearance of viscose fibre before crushing, ×2.

Figure 4.

The change in the modulus of elasticity of low-density CCCM depending on the carbonisation temperature. CCCM, carbon–carbon composite materials.
The change in the modulus of elasticity of low-density CCCM depending on the carbonisation temperature. CCCM, carbon–carbon composite materials.

Figure 5.

Dependence of shrinkage of low-density CCCM on carbonisation temperature. CCCM, carbon–carbon composite materials.
Dependence of shrinkage of low-density CCCM on carbonisation temperature. CCCM, carbon–carbon composite materials.

Figure 6.

Change in the compressive strength limit of low-density CCCM as a function of the carbonisation temperature. CCCM, carbon–carbon composite materials.
Change in the compressive strength limit of low-density CCCM as a function of the carbonisation temperature. CCCM, carbon–carbon composite materials.

Main physical and mechanical characteristics of low-density CCCM.

Name Isostatic technology Method of draining aqueous suspension
Material density (apparent) (g/m3) 0.45–0.75 0.17–0.21
Temperature factor of linear expansion (1/K) (5.5–6.1)·10−6 (4.3–5.3)·10−6
Compression strength limit (MPa) 0.60–0.80 0.70–1.10
0.85–1.05 0.84–1.25
Carbon content (%) 99.6 99.6
Thermal conductivity coefficient (W/(m·K); at 2,000 K) 0.55–0.80 0.45–0.55

Mechanical properties of carbon fibres.

Type of raw material Density (g/cm3) Young’s modulus (GPa) Tensile strength (MPa) Strain at breaking (%)
Viscose cord fibres 1.60 40 500 1.25
PAN fibres 1.80 230 4,500 2.00
Pitch fibres 2.00 520 2,100 0.40
eISSN:
2545-2835
Język:
Angielski
Częstotliwość wydawania:
4 razy w roku
Dziedziny czasopisma:
Engineering, Introductions and Overviews, other, Geosciences, Materials Sciences, Physics