Influences of SiO2 on Densification and Properties of Large Bulk Al2O3/ZrO2 (4Y) Eutectics

Quan Yang; Zhong Min Zhao; Long Zhang; Chuan Zeng Pan; Zhen Sheng Qu; Min Quan Wang

doi:10.4028/www.scientific.net/AMR.105-106.5

Paper Titles

Preface and Sponsors

Changes in Microstructures and Properties of Al₂O₃/ZrO₂ (Y₂O₃) with Different Content of ZrO₂
p.1

Influences of SiO₂ on Densification and Properties of Large Bulk Al₂O₃/ZrO₂ (4Y) Eutectics
p.5

Influence of Holding Time on the Properties of Alumina-Aluminium Titanate Fiber
p.9

Investigation on Al₂O₃/YSZ Eutectic Ceramics Lining in the Pipes Prepared by Combustion Synthesis
p.12

Preparation of Fe Coating Al₂O₃ Nanometer Composite Powder and its Mechanical Properties after Hot Press Sintering
p.16

Sintering of High-Strength Dense Al₂O₃ Using Rod-Like Submicron Al₂O₃ as Sintering Aid
p.20

Properties and Structure of Micro Porous Mullite-Corundum Refractory with High Strength
p.23

Effects of Sintering Additives on the Microstructure and Mechanical Properties of Silicon Nitride Ceramics by GPS
p.27

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Influences of SiO₂ on Densification and Properties of Large Bulk Al₂O₃/ZrO₂ (4Y) Eutectics

Abstract:

Based on preparing large bulk Al2O3/ZrO2 (4Y) eutectics, SiO2 additive is used for controlling the microstructures, densification and mechanical properties. XRD pattern showed SiO2 additive in the ceramics was in the form of glass phase. SEM images showed that the microstructure morphologies transformed from the cellular eutectics to the rod-shaped colonies with increasing content of SiO2 additive. With increasing content of SiO2 additive, the relative density of the ceramics increased whereas the hardness of the ceramics decreased. As the content of SiO2 additive reached 4%, fracture toughness of the ceramics had the maximum value due to the coupled toughening mechanisms of crack-pinning, crack- bridging and crack-deflection by rod-shaped colonies. As content of SiO2 additive reached 6%, the highest flexural strength of the ceramics was achieved due to high fracture toughness and small-size critical defect.