1. For sintering Al2O3, small amounts of MgO or SiO2 can be added as sintering aids,...

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1. For sintering Al2O3, small amounts of MgO or SiO2 can be added as sintering aids, which form glassy phases in the grain boundaries (liquid phase sintering). Draw the schematic microstructures of sintered Al2O3 ceramics for each sintering aid (MgO, SiO₂) (The following figure is the schematic microstructure of sintered Al2O3 without addition of sintering aid). Assuming that the interfacial energy of Al2O3- Al2O3 is √√3 ergs/cm², Al2O3-MgO is 1 ergs/cm², and Al2O3-SiO2 is √√3/2 ergs/cm². Al2O3 with MgO Al2O3 with SiO2 1. For sintering Al2O3, small amounts of MgO or SiO2 can be added as sintering aids, which form glassy phases in the grain boundaries (liquid phase sintering). Draw the schematic microstructures of sintered Al2O3 ceramics for each sintering aid (MgO, SiO₂) (The following figure is the schematic microstructure of sintered Al2O3 without addition of sintering aid). Assuming that the interfacial energy of Al2O3- Al2O3 is √√3 ergs/cm², Al2O3-MgO is 1 ergs/cm², and Al2O3-SiO2 is √√3/2 ergs/cm². Al2O3 with MgO Al2O3 with SiO2

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1 Al2O3 with MgO When MgO is added as a sintering aid to Al2O3 it forms a glassy phase at the grain ... View the full answer