Particle size of powder

Particle size of powder
1. Powder particle size
Powder particle size represents the size of a single powder particle, represented by powder diameter. Generally measured in micrometers（ μ m) ; It is also commonly represented by the number of items. The vast majority of powder particles have irregular shapes. For an irregular particle, the measurement methods for its particle size vary, its physical meaning varies, and the measurement values also vary.
2. Equivalent particle size
Definition of equivalent particle size: When the physical behavior or parameters of an irregular particle are the same or similar to those of a sphere with the same material, we refer to the diameter of the sphere as the equivalent particle size of the irregular particle. When the reference physical behavior or parameters are different, measuring the same irregular particle may result in multiple equivalent particle size values.
3. Particle size in practical use
The particle size in practical applications is not accurately described because the actual situation of the powder is very complex (such as the shape of the powder particles, the surface shape of the powder, calculation methods, etc.), and detection methods are difficult to achieve precise goals. Therefore, the particle size used in practical applications is only an approximate value of the powder particle size.
4. Average particle size and normal distribution of powder
The basic feature of powder size is the normal distribution centered on the average particle size. The number of particles is highest near the average particle size, and decreases as the particle size changes