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Powders, Volume 4, Issue 3 (September 2025) – 1 article

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12 pages, 3481 KiB  
Article
Formation of Layered Structure in Ceramics Based on Alumina Nanopowder Under Effect of Induction Heating
by Lina L. Sartinska
Powders 2025, 4(3), 18; https://doi.org/10.3390/powders4030018 - 20 Jun 2025
Abstract
The effect of induction heating on alumina ceramics and alumina ceramic composites based on α-Al2O3 nanopowders (additives: SiC, Si3N4, SiO2, ZrO2) has been examined. Various factors such as the structure, grain size, [...] Read more.
The effect of induction heating on alumina ceramics and alumina ceramic composites based on α-Al2O3 nanopowders (additives: SiC, Si3N4, SiO2, ZrO2) has been examined. Various factors such as the structure, grain size, distribution of elements, hardness, fracture toughness, and wear rate of hot-pressed ceramic materials were assessed. Despite achieving improved densification of alumina ceramics at a higher temperature of 1720 °C, there is a consistent trend toward a decline in hardness and fracture toughness. Heating at lower temperatures of 1300–1500 °C results in the development of a strengthened surface layer with a fine-grained structure enriched with carbon. Therefore, the wear rate behavior of such ceramics differs from the behavior of samples made at higher temperatures of 1600–1720 °C. This fact indicates the presence of a non-thermal microwave effect of induction heating. The incorporation of additives to alumina leads to the formation of novel structures with altered crack propagation patterns. The optimal ceramic composite, containing 5 wt. % SiC, displayed superior hardness and the lowest wear rate when compared to pure alumina ceramics. Across all investigated composites, a short dwell time at 1700 °C results in an enhancement of the mechanical properties. Full article
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