상용 알루미나 분말(0.5${mu}$m, 3${mu}$m)을 die-press법을 이용하여 1120$^{circ}$C에서 2시간 1차 소결하여 다공성 전성형체를 제조하고 1100$^{circ}$C에서 4시간 $La_2O_3-Al_2O_3-SiO_2$계 유리를 용융 침투시켜 치밀한 유리-알루미나 복합체를 제조하였다. 알루미나 입도가 유리-알루미나 복합체의 충진율, 미세조직, 젖음성, 기공률 및 크기, 기계적 특성에 미치는 영향을 조사하였다. 입도 범위가 0.1∼48${mu}$m로 넓고 bimodal size 입도 분포를 가지면서 random orientation을 가진 3${mu}$m 알루미나가 분산된 복합체가 최적의 기계적 특성 및 충진률이 관찰되었으며 강도와 인성값은 각각 519MPa, $4.5MPa{cdot}m^{1/2}$이었다.
Two commercial alumina powders having different particle size of $0.5{mu}m$ and 3${mu}$m were presintered at 1120$^{circ}$C for 2h and then lanthanum aluminosilicate glass was infiltrated at 1100$^{circ}$C for up to 4h to obtain the densified glass-alumina composites. The effect of alumina particle size on packing factor, microstructure, wetting, porosity and pore size, and mechanical properties of the composite was investigated. The optimum mechanical properties and compaction behavior were observed for the 3${mu}$m alumina particle dispersed composite. The 3${mu}$m alumina particle size and distribution for he preform were within 0.1 to 48${mu}$m and bimodal and random orientation. The strength and the fracture toughness of the composite having 3${mu}$m alumina particles were 519MPa and $4.5MPa{cdot}m^{1/2}$, respectively.
