The sedimentation methods of silicon carbide powder and white corundum powder were introduced

The sedimentation method is the principle that the sedimentation of the base thousand particles in the liquid conforms to the principle of Stokes' law, and the particle size of the particles is calculated according to the final sedimentation velocity* according to the sedimentation of the particles in the liquid. In practice, it is very difficult to dry test the particle size* final sedimentation velocity of the particles, so all sedimentation meters measure and measure* other physical parameters related to the final sedimentation velocity, such as pressure, density, weight, concentration or light permeability, to obtain the particle size distribution. The measurement methods of silicon carbide powder and white corundum powder are introduced

Sedimentation methods are divided into gravity sedimentation and centrifugal sedimentation. The test range of gravity sedimentation is usually 0.5~100um, and the measurable particle size range of centrifugal sedimentation is 0.05~5um. At present, gravity sedimentation instrument generally adopts a combination of gravity sedimentation and centrifugal sedimentation. The measurement methods of silicon carbide powder and white fused alumina powder were introduced

The resistance method, also known as the Coulter counting method, is suitable for measuring particles with relatively narrow particle size distributions. The principle of its operation is relatively simple; Under negative pressure, an electrocathode consisting of two platinum electrodes is inserted into both sides of the hole through a brat made of ruby. As the particles pass through the pores, the electrocathode between the electrodes increases, generating a voltage pulse. The amplitude of the pulse corresponds to the volume and size of the particles, and the number of pulses corresponds to the number of particles. For all the pulses measured, and their amplitude is determined, the size of the particles can be obtained, and the distribution of the particles can be calculated. The electro-cathonine method is a high-resolution and high-particle analysis technique. This paper introduces the measurement methods of silicon carbide powder and white corundum powder

Laser diffraction

Laser diffraction (also known as small-angle forward scattering) is a well-established and applied method of scattering laser particle measurement technology as a universal method, which utilizes the classical classical method to obtain the size and distribution of particle size by measuring the scattered light energy distribution of particles in a small front angle range of Mie scattering theory and the Fran and Fern theory applicable to large particles. For particles with larger particle sizes, the small-angle forward scattering method is also known as the diffraction method because the scattering in the forward small-angle range is mainly diffraction. The measurement methods of silicon carbide powder and white corundum powder are introduced

Laser diffraction method has a wide range of particle size measurement, accurate measurement, high precision, good repeatability, fast measurement speed, few physical parameters that need to be provided, and can be used for online measurement in a wide range of applications.

Three types are used: Laser Particle Size Analyzer (Laser Diffraction Method), Coulter Counter (Electrically Limited Method), and Centrifugal Particle Size Analyzer (Sedimentation Method)* Compared with the test results of general particle size analyzers, the standard deviation of 50 values can be obtained by statistical analysis of the Mass Size Analyzer D: the standard deviation of the laser particle size analyzer is 0.008 on average: The average standard deviation of the Coulter counter is 0.219 for the centrifugal particle size analyzer, so it can be seen that the measured standard deviation of the laser particle size analyzer D standard deviation of 50* Low repeatability of measurement results* The measurement repeatability and measurement accuracy of centrifugal particle size analyzers are relatively poor.