Reactive Spark Plasma Sintering of Y۳Al۵O۱۲-MgAl۲O۴ Composites
Publish place: Advanced Ceramics Progress، Vol: 7، Issue: 3
Publish Year: 1400
نوع سند: مقاله ژورنالی
زبان: English
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JR_ACERPT-7-3_007
تاریخ نمایه سازی: 20 اردیبهشت 1401
Abstract:
In this study, Y۳Al۵O۱۲-MgAl۲O۴ (YAG-Spinel) composites, with different molar ratios (۱:۱ and ۱:۳), were in-situ fabricated using Reactive Spark Plasma Sintering (RSPS) technique. To this end, Al۲O۳, MgO, and Y۲O۳ powders were used as the starting materials. In-situ formation of YAG-Spinel composites was investigated based on the reaction ۳.۵ Al۲O۳ + MgO + ۱.۵ Y۲O۳ → Y۳Al۵O۱۲ + MgAl۲O۴. Both synthesis and densification processes were accomplished using a single-cycle RSPS with one-step heating. The RSPS process was performed at a sintering temperature of ۱۳۰۰ °C for ۳۰ min hold time with a maximum uniaxial pressure of ۹۰ MPa under vacuum conditions. The synthesized phases and microstructures were investigated by X-ray diffraction and field emission scanning electron microscopy. The unwanted phases such as YAP (YAlO۳) in a composite microstructure were removed using LiF additive. LiF was used as a sintering aid in the process of sintering. The in-situ synthesized YAG-Spinel composites exhibited no internal infrared transmittance over the infrared wavelength ranges of ۲.۵-۲۵ µm.
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Authors
R. Irankhah
Assistant Professor, Department of Ceramic, Faculty of Materials and Metallurgical Engineering, Semnan University, Semnan, Semnan, Iran
M. Zakeri
Associate Professor, Department of Ceramics, Materials and Energy Research Center (MERC), Meshkindasht, Alborz, Iran
M. R. Rahimipour
Professor, Department of Ceramics, Materials and Energy Research Center (MERC), Meshkindasht, Alborz, Iran
M. Razavi
Associate Professor, Department of Ceramics, Materials and Energy Research Center (MERC), Meshkindasht, Alborz, Iran
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