Тип публикации: статья из журнала
Год издания: 2022
Идентификатор DOI: 10.1007/s11148-022-00700-1
Ключевые слова: mechanical properties, resistance to oxidation, silicon nitride, thermal conductivity, thermophysical properties, weight gain
Аннотация: Dense materials based on Si3N4 with oxide additives activating sintering were obtained by reaction and liquid-phase sintering and hot pressing. Their physical and mechanical properties were determined. Porous samples were obtained by semi-dry forming of Si3N4 + Si workpieces followed by reactive sintering in a nitrogen atmosphere. Показать полностьюThe porosity was controlled by decreasing the Si concentration in the initial charge. The thermal conductivity of the materials was highly dependent on porosity and decreased with increasing temperature. The thermal conductivity of hot-pressed materials decreased from 60 W/(m·K) at room temperature to 35 W/(m·K) at 1200°C, at which temperature the weight gain of the samples was 7 × 10–4 kg/m2. The weight gain of the porous materials increased from 4 × 10–3 kg/m2 with a sample porosity of 32% to 6 × 10–3 kg/m2 with 56% porosity. It was shown that an oxygen impurity was the main reason for the decrease in the thermal conductivity of the Si3N4 ceramics. © 2022, Springer Science+Business Media, LLC, part of Springer Nature.
Журнал: Refractories and Industrial Ceramics
Выпуск журнала: Vol. 63, Is. 2
Номера страниц: 163-168
ISSN журнала: 10834877
Издатель: Springer