Measurement method of powder particle size

Measurement method of powder particle size
1. Screening method: Generally used for powder materials. When using the screening method to determine powder particles, the material is divided into a set of samples with different mesh sizes to determine the percentage content of various particle sizes. For example, if you need 200 mesh powder, you can choose to pass through 150 mesh undersize and 250 mesh undersize; Requires -200 mesh powder, simply select the material below the 200 mesh sieve.
2. Electron microscopy method: For powder particles with relatively small particle sizes and ultrafine powders, optical microscopy method is generally used. The microscope method is the only method that can observe powder particles and measure particle size, and is considered a relatively perfect way by scientific workers.
3、 The influence of powder particle size on mixing
The average particle size of the powder is also an important factor affecting mixing:
1. Mixing powders with similar particle sizes can easily achieve uniform mixing:
This is because under the same other conditions, the same particle size of the powder during movement is less likely to cause segregation, resulting in a smooth and uniform mixing of the powder.
2. The difference in powder particle size is significant, making it difficult to achieve uniform powder mixing:
This is because the smaller the particle size of the powder, the finer the powder, and there is a tendency for the powder to float up when mixed. On the contrary, the larger the particle size of the powder, the coarser the powder, and the powder tends to sink when mixed. This leads to segregation phenomenon and brings difficulties to mixed work.