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- 저자 : Mouhamadou A. Diop (검색결과 1 건)
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Shuangjun Ma,Long Wang,Yun Peng Zhang,Nan Zou,Mouhamadou A. Diop 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.9
Most existing studies present microwaves as a heating technique that improves alumina sintering. However, the experimentaldevice limits have hampered the identification of the effects’ nature. Because of this, most of the studies in the literatureuse a phenomenological approach to characterize the microwave (MW) sintering technique, and there are few systematiccomparisons with standard sintering (ST). This work aims to directly and accurately compare the alumina sintering behaviorin a microwave (MW) and standard technique (ST) heating. The approach proposed in the present study depicts the electromagneticand radiation interactions with the aluminum oxides and investigates the α and β-alumina densification process. The direct and indirect sintering results in MW furnaces with a single-mode resonant cavity present the MW effects, suchas the electromagnetic field, to accelerate the alumina densification. For pure α-powders, the MW effects occur at the initialand intermediate sintering stages. The results show a diminution of the sintering driving force throughout the densificationprocess in a heating cavity. They seem to prevent obtaining a higher final density compared to ST sintering. In direct modesintering (DMS), the magnetic field accelerates the densification mechanisms and the surface scattering. At high temperaturesand densities, the ST driving force is also weakened, while in hybrid mode sintering, there is no degradation in the drivingforce, which remains stronger compared to DMS.
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