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Journal of the Korean Ceramic Society 1992;29(1): 23. |
| La-$beta$-Aluminate의 형성이 $alpha$-Alumina의 기계적 성질에 미치는 영향 |
| 강석원, 고재웅, 김해두 |
| 한국기계연구소 요업재료실 |
| Formation of La-$beta$-Aluminate in $alpha$-Alumina Matrix and Its Influence on Mechanical Properties |
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| ABSTRACT |
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Alumina ceramics was reinforced by in-situ formation of La-${beta}$-aluminate in ${alpha}$-alumina matrix. The powder mixture of which composition is (100-12x)Al2O3+x(La2O3+11Al2O3) was prepared for the formation of La-${beta}$-aluminate in ${alpha}$-alumina matrix. The amount of La-${beta}$-aluminate in the matrix was controlled by varing x which is number of moles. The dense composite was produced by sintering at 1600$^{circ}C$ in air or hot-pressing at 1550$^{circ}C$ under 30 MPa. Bending strength and fracture toughness were increased, resulting from the grain growth inhibition and the crack deflection and crack bridging mechanism when La-${beta}$-aluminate was produced in ${alpha}$-alumina matrix |
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