Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1581297 | Materials Science and Engineering: A | 2009 | 5 Pages |
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 Lu2O3/Al2O3 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 Jâ² phase given by Lu4Si2âxAlxO7+xN2âx was considered to be secondary crystalline phase at the grain pockets. The composition with a Lu2O3/Al2O3 weight ratio 10/10 had highest strength of 690 ± 50 MPa.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Bo Wang, Jun Yang, Rui Guo, Jiqiang Gao, Jianfeng Yang,