what’s the finest granularity of tabular alumina can made?

In regular production and application, the common fine powder of tabular alumina has relatively fixed granularity grades. The 200 – mesh specification is common, and the corresponding particle size is about 74μm. There is also the 325 – mesh specification, which is approximately 45μm. Taking the 325 – mesh tabular alumina fine powder as an example, its particles smaller than 0.044mm can account for more than 85%, which is widely used in common high – alumina unshaped refractory materials and ordinary casting auxiliary materials. In addition, there are also 400 – mesh conventional fine powder products in the market, with a particle size of about 38μm, and the pass rate during factory inspection can reach more than 98%.

For high-end application scenarios such as high-performance refractory materials and special ceramic materials, manufacturers can produce tabular alumina ultra-fine powder with smaller granularity through special grinding processes. At present, the sintered tabular alumina ultra-fine powder on the market can achieve D50 values of 3μm, 5μm, and 10μm. Such ultra-fine tabular alumina powder has better filling performance and reactivity. When used to prepare micro-porous refractory materials or high-precision ceramic blanks, it can effectively optimize the internal structure of the products and improve their thermal shock resistance and mechanical strength.