Study on Fracture Behavior of Alumina Ceramics Toughened by Combining In Situ Growth Abnormal Grains, 3Y-TZP and Cu

Abstract:

α-Al2O3 powders, a small amount of 3Y-TZP and Cu powders were used as principle materials in which adequate amount of TiO2-MgO-CAS system additives were added by wet grinding .The compacts were prepared by hot-pressed sintering. The results showed that the fracture toughness was significantly enhanced by synergistic toughening of in-situ growth abnormal grain, phase transformation and metal particles. Under the sinter condition of 30MPa and 1550
for 1h, the maximum fracture toughness reached to 7.90MPa·m1/2 and the bending strength is in advance of 600Mpa, which was one time higher than un-toughen alumina ceramics. The effects of multiphase synergistic toughening on the fracture toughness of alumina ceramic were investigated; meanwhile, the fracture behavior and the mechanisms of toughening were analyzed.

• Periodical: Key Engineering Materials (Volumes 324-325)
• Pages: 511-514
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.324-325.511
• Online since: November 2006
• Authors: Shou Fan Rong, Jing Qiang Zhang, Ze Sheng Ji
• Keywords: Alumina Ceramic, Fracture Behaviour, Multiphase Synergistic Toughening, Toughening Mechanism

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