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Journal of the Korean Ceramic Society 1992;29(10): 797. |
Al2O3/ZrO2-Spinel계 복합체의 미세구조 및 물성제어: I. Al2O3-ZrO2 복합분체의 제조 및 소결특성 |
현상훈, 송원선 |
연세대학교 세라믹공학과 |
Control of Microstructures and Properties of Composites of the Al2O3/ZrO2-ZrO2-Spinel System: I. Preparation and Sintering Behavior of Al2O3-ZrO2 Composite Powders |
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ABSTRACT |
Al2O3-20 wt% ZrO2 composite powders to be used as the starting materials of the Al2O3/ZrO2-Spinel composite system were prepared by the use of the emulsion-hot kerosene drying method. The crystalline phase of ZrO2 in the synthesized Al2O3-ZrO2 composite powders was 100% tetragonal but the small amount of t-ZrO2 was transformed into m-ZrO2 after crushing. The hardness, fracture toughness, and flexural strength of the composite, which was sintered at 1650$^{circ}C$ for 4 hrs after calcining at 1100$^{circ}C$ for 2 hrs and had the relative density of 99%, were 15.7 GPa, 4.97 MN/m3/2, and 390 MPa, respectively. The fracture form in the sintered composites was found to be the intergranular fracture. |
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