高固相含量氧化铝浆料的制备及其烧结性能研究

Preparation and Sintering Properties of Alumina Slurries with high solid loading

利用角形态和球形态的氧化铝粉制备了氧化铝浆料。通过制备氧化铝薄层的方法,初步探索了球形态粉体对提高浆料固相含量的作用,并研究了浆料固相含量对氧化铝烧结性能的影响。结果表明,球形态粉体可以获得更高的固相含量,制得的浆料最高固相含量可达到68%(体积分数,下同)。推断球形粉可通过规律堆积降低浆料粘度,从而有利于提高固相含量。浆料固相含量由50%提高到55%时,对应的烧结体致密度明显增加,但继续提高浆料固相含量,烧结体致密度增加不大。

Alumina slurries were prepared using angular and spherical alumina powder as raw material. The relationship between spherical powder and solid loading was studied by preparing thin alumina layer. Moreover, the effect of slurry’s solid loading on the sintering properties was also studied. The results show that the slurry with higher solid loading could be obtained from spherical alumina powder, and the highest solid loading of the as-prepared slurry is 68% (volume fraction). It could be inferred that spherical powder can decrease the viscosity of aqneous suspension due to regular packing, and it is beneficial to the increasing of solid loading of the slurry. The corresponding density of the sintered body increases with the sturry’s solid loading increasing from 50% up to 55%, However, further increase of the solid loading can not enhance the density greatly.