Abstract
Various silicon nitride materials were fabricated by pressureless sintering using lutetia and alumina as sintering additives. Densification behavior, microstructure, strength and formation of secondary crystalline phases were investigated. The combination of Lu 2O 3/Al 2O 3 sintering aids can promote the densification and evolution of a fine grain microstructure of Lu–Al-doped silicon nitride because of the low viscosity of the liquid. The J′ phase given by Lu 4Si 2− x Al x O 7+ x N 2− x was considered to be secondary crystalline phase at the grain pockets. The composition with a Lu 2O 3/Al 2O 3 weight ratio 10/10 had highest strength of 690 ± 50 MPa.
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