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vol 67 / May, 2024
Article

DOI 10.17586/0021-3454-2016-59-4-317-322

UDC 536.2

DEPENDENCE OF THERMAL CONDUCTIVITY OF SILICONE-BASED COMPOSITE ON VOLUME CONCENTRATION OF BORON NITRIDE

V. A. Mikheev
BSTU “VOENMEH”; Graduate Student


V. S. Sulaberidze
BSTU “VOENMEH”;


V. D. Mushenko
STOLP Ltd.; General Director


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Abstract. Composite material on the base of silicon with boron nitride is considered. Special features of the composite thermal conductivity dependence on volume concentration of the filler are studied experimentally. The results show that at 20°С thermal conductivity changes by a factor of 2,5 from 1,46 W/(m·K) to 4,10 W/(m·K), when BN comprises ≈22 vol.%. An explanation for the obtained results is offered on the grounds of percolation theory and the impact of the filler dispersity on the effective thermal conductivity of the composite. The percolation effect appears to be the stronger, the higher is the difference between the studied characteristic of the filler and the binder; example of model system of paraffin + graphite is presented as an illustration. 
Keywords: thermal conductivity, composite material, filler, binder, BN, percolation threshold, percolation

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