Effect of high pressure on microstructure and mechanical and optical properties of nano-structured MgAl2O4 spinel fabricated by High Pressure Spark Plasma Sintering
Résumé
Nano-structured MgAl₂O₄ spinel ceramics were fabricated by High-Pressure Spark Plasma Sintering (HP-SPS) up to 5 GPa. High-pressure compaction creates green bodies with fine pores and improved density, enhancing the sintering process. Applying a pressure of 1.5 GPa reduces sintering temperatures by 500°C, resulting in dense, transparent ceramics without grain coarsening. The ceramics show increased hardness due to their nano-scale grain structure, though some optical losses at shorter wavelengths are observed due to stress-induced crystalline defects.
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