Densification and α/β Phase Transformation of SHS Si3N4 Containing Al2O3 and Y2O3 during Sintering

Ling Bai; Chang Chun Ge; Wei Ping Shen; Ke Zhang; X.D. Mao

doi:10.4028/www.scientific.net/MSF.561-565.577

Paper Titles

Negative Thermal Expansion in Mn₃Ga(Ge,Si)N Anti-Perovskite Materials
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Wear Characteristics of Bulk Ti₃AlC₂ under Current-Carrying Conditions
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Depth Selective Electronic State Analysis of Implanted Nitrogen in Visible-Light Response TiO₂ Photocatalyst
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Novel Aluminium Nitride Surface Coatings Formed on Aluminium
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Densification and α/β Phase Transformation of SHS Si₃N₄ Containing Al₂O₃ and Y₂O₃ during Sintering
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Zinc Oxide Ceramics with High Mobility as n-Type Thermoelectric Materials
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Preparation and Characterization of β-SiAlON Ceramics from High Aluminium Fly Ash via Carbothermal Reduction-Nitridation
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XRD and HRTEM Study of Zirconia Nanoparticles Synthesized by Laser Ablation
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Effect of Oxygen Partial Pressure on Electrical Conductivity of Ca-Ru-O Compounds Prepared by Spark Plasma Sintering
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Densification and α/β Phase Transformation of SHS Si₃N₄ Containing Al₂O₃ and Y₂O₃ during Sintering

Abstract:

The densification and phase transformation of high α-phase silicon nitride powder synthesized by SHS with a combination of Y2O3 and Al2O3 sintering additives were investigated. The densification process occurred rapidly from 1400 to 1500 °C and was nearly finished at 1500 °C. However, the α-β transformation of silicon nitride progressed rapidly from 1500 to 1600 °C, and completed at 1600 °C. The phase transformation of silicon nitride lagged behind the densification of Si3N4 ceramics. It showed that the solution and precipitation process did not play the main role in the densification of silicon nitride. The sufficient amount of liquid phase was crucial to complete the densification.