Studying the effect of silicon carbide particle size on the thermal coefficient linear expansion of the composite material based on aluminum alloy

Nyafkin A.N., Shavnev A.A., Kurbatkina E.I., Kosolapov D.V.
UDC
669.018.95
DOI
10.18577/2307-6046-2020-0-2-41-49
Article PDF (Russian) (737.41 KB)
How to cite
Nyafkin A.N., Shavnev A.A., Kurbatkina E.I., Kosolapov D.V. Studying the effect of silicon carbide particle size on the thermal coefficient linear expansion of the composite material based on aluminum alloy // Proceedings of VIAM. 2020. No. 2. DOI: 10.18577/2307-6046-2020-0-2-41-49. URL: https://test.viam.ru/en/journal/2020/2/5
Keywords
highly filled metal composite material, vacuum-compression impregnation of porous blanks, aluminium alloy, silicon carbide, temperature coefficient of linear expansion.
Abstract

A metal composite material (MMC) based on an aluminum cast alloy of the Al–Mg–Cu–Si system containing 65±1% (vol.) silicon carbide and obtained using vacuum compression impregnation technology was developed and studied. Porous preforms with different particle sizes of silicon carbide were obtained by cold compaction followed by melt impregnation of an aluminum alloy. The temperature coefficient of linear expansion (TCLE) was measured in the temperature range from -100 to +400 °С, and the density and volume content of a composite material with various particle sizes of silicon carbide were measured. It was found that with increasing particle size, the TCLE fraction decreases by 15–20% at 20 °C, due to the low content of interphase boundaries of theheterogeneous structure of the composite.

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