Abstract
The sintering behavior of bimodal alumina powders was investigated with reference to the change of open pore size distributions. Avarage particle sizes of fine and coarse alumina powders were 0.52μm (f particle) and 6.3μm (c particle). The coarse powder was spherical and polycrystalline. The open pore size distributions in green compacts were narrow for specimens with mixing ratios c:f=4:6-1:9, but were broad for c:f=9:1-5:5. When sintered at 1400°-1600°C, the open pore size increased with c:f=9:1-4:6, remained unchanged with c:f=3:7-1:9, and decreased with c:f=0:10. It is considered that the growth of pores was caused by the difference of sintering rates between tight and loose-packed parts, and also between c and f particles.
