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1998
Journal Article
Titel
Fracture origin and strength in advanced pressureless-sintered alumina
Abstract
Advanced raw materials and shaping approaches give a bending strength of more than 800 MPa. In individual specimens that fracture at lower stresses of 450-600 MPa, fracture often originates at volume flaws as known for hot-pressed alumina with a similar strength. Also, transgranular and intergranular fracture modes along the crack path are the same as observed in hot-pressed alumina. If the size and the frequency of volume flaws are reduced, fracture initiates at smaller defects in the ground surfaces. The grain size dependence of grinding induced surface damage contributes to a grain size effect in the strength.