Effect of Addition of Fused Alumina on Mechanical Properties of $\alpha$-alumina/$\beta$"-alumina System

Fused Alumina의 첨가가 $\alpha$-alumina/$\beta$"-alumina계의 기계적 성질에 미치는 영향

The $\alpha$-alumina/fused alumina/$\beta$"-alumina specimens were fabricated by addition of fused alumina to $\alpha$-alumina/$\beta$"-alumina system. The sintered densities with and without fused alumina were almost same. But, the bending strength was decreased due to the presense of defects caused by the inhomogeneous dispersion of large fused alumina particles. And the fracture toughness was also decreased because the crack propagated through the fused alumina particles due to the imperfection of $\beta$"-alumina coating around them.