Naslov
Conventional and Unconventional Sintering of Alumina Ceramics

Autori
Vukšić, Milan ; Žmak, Irena ; Ćurković, Lidija

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Program and Book of Abstracts of The 1st International Conference on Innovative Materials in Extreme Conditions / Matović, Branko ; Cvijović-Alagić, Ivana ; Maksimović, Vesna - Beograd : Vinča Institute of Nuclear Sciences, 2022, 55-55

ISBN
978-86-7306-158-0

Skup
1st International Conference on Innovative Materials in Extreme Conditions

Mjesto i datum
Beograd, Srbija, 22.03.2022. - 23.03.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Alumina ; Sintering

Sažetak
Corundum (α-alumina) is one of the most exploited materials in the ceramic industry due to its low cost, and, importantly, due to excellent properties such as high strength and hardness, thermal stability, high wear resistance, and high chemical stability at elevated temperatures. The goal of this paper is to explain the influence of the different sintering techniques on the properties of alumina ceramics, which contain a considerable amount of waste alumina powder. The study focused on the investigation of the conventional sintering and hybrid microwave sintering of alumina green bodies in which the grain growth and densification were characterized after sintering. The waste alumina powder, which is generated during machining of alumina green compacts and high-purity 99.99 % alumina powder (α-Al2O3, Alcan Chemicals, USA), were used as starting materials. The stable concentrated aqueous alumina suspensions were prepared, and alumina green bodies were obtained by the slip casting method. The dried green samples were then conventionally sintered by using an electric furnace and by using a hybrid microwave sintering furnace. The used hybrid microwave sintering atmospheric furnace consists of a 2.45 GHz microwave generator with a continuously adjustable power output from 0 to 3 kW and external heating elements. The sintered samples exhibited higher density values and larger grain size for the conventional, one-step sintering, while for the hybrid microwave sintering lower density values and smaller grain size were observed. The slightly lower density values can be explained by the fact that alumina is a very poor microwave absorber, while smaller grain size can be explained by the fact that the rapid heating of microwave prevented grain size growth.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo, Temeljne tehničke znanosti

POVEZANOST RADA