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1) Tap density: Tap density is one of the important items in the test of powder comprehensive characteristic tester. Tap density refers to the vibration of the container after the powder is filled in a specific container, thereby destroying the gap in the powder. The density of the powder after it is in a tightly packed state. By measuring the tap density, data such as the fluidity and void ratio of the powder can be known. (Note: The tap density of the metal powder is performed in a special powder corresponding standards).
2) Bulk density: Bulk density is also one of the important items in the test of the powder comprehensive characteristic tester. The bulk density refers to the density of the powder after it is naturally filled in a specific container. This indicator is important for the design of storage containers and bags. (Note: The bulk density of special powders such as metal powder is performed according to the corresponding standards).
3) Angle of repose: The maximum angle formed by the free surface of the powder accumulation layer in the static equilibrium state with the horizontal plane is called the angle of repose. It is formed by the natural drop of the powder onto a specific platform in a specific way. The angle of repose has the greatest influence on the fluidity of the split, and the smaller the angle of repose, the better the fluidity of the powder. The angle of repose is also called the angle of repose, the angle of natural slope, and the like.
4) Collapse angle: The bottom corner of the cone is called the collapse angle after a certain impact is applied to the accumulated powder for measuring the angle of repose.
5) Flat angle: The flat plate buried in the powder is lifted vertically upward, and the average value of the angle between the free surface (bevel) of the powder on the flat plate and the flat plate and the angle after being subjected to the shock is called the flat plate angle. In the actual measurement process, the plate angle is expressed as the angle after the flat plate is lifted and the average value of the angle at which the unstable powder is removed after the plate is impacted. The smaller the plate angle, the stronger the fluidity of the powder. Generally, the plate angle is greater than the angle of repose.
6) Dispersion: The degree of difficulty in dispersing the powder in the air is called dispersion. The measurement method is to measure the percentage of the sample outside the receiving tray to the total amount of the sample after dropping 10 g of the sample from a certain height. The degree of dispersion is related to the dispersibility, floatability and spatterability of the sample. If the dispersion exceeds 50%, the sample has a strong tendency to splash.
2. Standard calculation items for relevant parameters in the powder comprehensive characteristic tester:
1) Difference angle: The difference between the angle of repose and the angle of collapse is called the difference angle. The larger the difference angle, the stronger the fluidity and jet flowability of the powder.
2) Compression: The ratio of the difference between the tap density and the bulk density of the same sample to the tap density is the degree of compression. The degree of compression is also known as the compression ratio. The smaller the degree of compression, the better the fluidity of the powder.
3) Void ratio: The void ratio refers to the percentage of voids in the powder as a whole of the volume of the powder. The void ratio varies depending on factors such as the particle shape, the arrangement structure, and the particle diameter of the powder. When the particles are spherical, the powder void ratio is about 40%; when the particles are ultrafine or irregular, the powder void ratio is 70-80% or higher.
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