Miyake Kimiya, Hirata Yoshihiro, Shimonosono Taro, Sameshima Soichiro
Department of Chemistry, Biotechnology, and Chemical Engineering, Kagoshima University, Kagoshima 890-0065, Japan.
Materials (Basel). 2018 Jul 4;11(7):1137. doi: 10.3390/ma11071137.
Alumina particles with different shapes, such as sphere, rod, and disk, were examined for the sintering behavior and compressive strength of partially sintered porous alumina. While both the spherical and disk-like particles were packed well to the relative density of 61.2⁻62.3%, the packing density of rod-like particles was only 33.5%. The sintering rate of alumina particles increased in the order of disk < rod < sphere. The compressive strength of sintered porous alumina was higher for the spherical particles than for the rod-like and disk-like particles. The uniform distribution of the applied load over many developed grain boundaries contributed to the increase in the compressive strength for the spherical particles. The applied load concentrated on a few grain boundaries of rod-like or disk-like particles, caused fracture at a low compressive stress.
研究了具有不同形状（如球形、棒状和盘状）的氧化铝颗粒在部分烧结多孔氧化铝的烧结行为和抗压强度方面的表现。虽然球形和盘状颗粒都能很好地填充至相对密度为61.2⁻62.3%，但棒状颗粒的填充密度仅为33.5%。氧化铝颗粒的烧结速率按盘状＜棒状＜球形的顺序增加。烧结多孔氧化铝的抗压强度对于球形颗粒高于棒状和盘状颗粒。施加的载荷在许多发育的晶界上均匀分布有助于球形颗粒抗压强度的提高。施加的载荷集中在棒状或盘状颗粒的少数晶界上，导致在低压缩应力下发生断裂。
