Ultrafine Powders of the Refractory Materials in the Composite Development

Millers, T.; Grabis, Jānis; Zālīte, Ilmārs

doi:10.1007/978-94-011-3676-1_14

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“…Silicon nitride (Si 3 N 4 ), titanium nitride (TiN), and alumina (Al 2 O 3 ) powders prepared by plasma chemical synthesis of mean size ≤ 0.03 µm were used as initial powders [37,38]. As received, these powders were electrostatically charged and could shift under the effect of a magnetic field.…”

Section: Methodsmentioning

confidence: 99%

Effect of Induction Heating on Surface Properties of Hot-Pressed Ceramics Based on Nanopowders Si3N4 and TiN

Sartinska

2023

Powders

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The effect of induction heating on the surface properties of hot-pressed ceramics based on plasma chemical nanopowders Si3N4 and TiN (additives: Al2O3, AlN, and Y2O3) has been studied. The research demonstrates the formation of a modified layer on the surface of the hot-pressed material. The study examines the porosity, hardness, fracture toughness, brittleness, distribution of elements, and wear of hot-pressed ceramics on the surface before and after additional grinding. Removal of the surface porous layer results in increased density and hardness, leading to a higher number of acoustic emission signals during scratching with a Vickers indenter. A different response to scratching indicates a transgranular or intergranular fracture of the structure. The presence of porosity and carbon contamination on the surface layer of materials negatively impacts the properties of TiN-reinforced ceramics based on Si3N4-Al2O3-AlN (SIALON). However, the addition of Y2O3 effectively prevents carbon penetration and reduces the effect of grinding. Additionally, the dark-colored tone observed on the outer volume of the samples suggests a non-thermal microwave effect of the induction furnace.

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Section: Methodsmentioning

confidence: 99%

Effect of Induction Heating on Surface Properties of Hot-Pressed Ceramics Based on Nanopowders Si3N4 and TiN

Sartinska

2023

Powders

View full text Add to dashboard Cite

show abstract

Ultrafine Powders of the Refractory Materials in the Composite Development

Cited by 1 publication

References 1 publication

Effect of Induction Heating on Surface Properties of Hot-Pressed Ceramics Based on Nanopowders Si3N4 and TiN

Effect of Induction Heating on Surface Properties of Hot-Pressed Ceramics Based on Nanopowders Si3N4 and TiN

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