Studying of sintered WC-8Co powder with coatings of aluminum oxide produced by atomic layer deposition

다국어 초록 (Multilingual Abstract)

Grain size reduction in cemented carbides leads to higher mechanical properties. Therefore, preventing the grain growthduring sintering is a crucial task. This study proposes the application of Al2O3 coatings obtained by atomic layer deposition(ALD) on WC-8Co powder, where Al2O3 is added as a grain growth inhibitor. After deposition, the films were found both onseparate particles and on the dense agglomerates. The thickness of aluminum oxide varied in the range of 30-100 nmdepending on the synthesis parameters and the powder’s bulk density. Composite particles were compacted using sparkplasma sintering (SPS). The compacted samples density was about 99-99.6% of the theoretical. Alumina was found on thegrain boundaries of tungsten carbide.

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