Density is a physical quantity that reflects the characteristics of a substance. The nature of a substance refers to a property that the substance itself has and can distinguish from each other. People often feel that a substance with a high density is "heavy" and a substance with a small density is "light", here " "Heavy" and "light" essentially refer to the size of the density.
Quality is the amount of matter contained in an object. The amount of material contained is reduced, so the quality is reduced. Density is a property of matter. It does not change with the change of mass and volume. The density of the same substance does not change. It is only related to the type of matter and the state of matter. The density of different substances is generally different. The density of the substances is the same.
formula
Formula for density: Ï=m/V (Ï is density, m is mass, V is volume)
Density formula change: m=ÏV, V=m/Ï
Various "density" nouns and meanings in powder materials:
True density
2, bulk density (heap density, including tap density and bulk density
3. Bulk density (loose density, bulk density, shallow packing density, loose bulk density, bulk density, body density)
4. Tap density (closed bulk density, tight bulk density)
1. True Density refers to the actual mass of solid matter per unit volume of a material in an absolutely dense state, that is, the density (called true density) after removing internal pores or voids between particles. The physical properties corresponding to it are also apparent density and bulk density. This type of analyzer uses helium to replace the infiltrating liquid. Helium is an inert gas with small molecular diameter. It has the characteristics of easy diffusion, good permeability and good stability. It quickly penetrates into the internal pores of the material and cannot be measured by conventional methods. Material pores and irregular surface depressions can be quickly filled. The measured sample volume is closer to the true volume of the sample compared to the density bottle method, so that the true density value of the sample is closer to the true value.
The JL-1206 true density meter developed by Chengdu Jingxin has a volume range of 0.01 cm3 to 100 cm3 and can measure the true density of various powders and solids. (Liquid cannot be tested)
Figure 1 true density meter
2. Apparent density of powders refers to the bulk density measured after the powder is freely filled with standard containers under the specified conditions, that is, the mass per unit volume when the powder is loosely packed. The unit is expressed in g/cm3. A process property of powder. There are many other types of loose density, such as bulk density, loose packing density, bulk density, loose bulk density, bulk density, and bulk density.
Loose density is a comprehensive manifestation of various properties of powder. It is very important for the stability of powder metallurgy, mechanical parts production process and product quality control, and also the basis of mold design.
JL-A3 powder comprehensive characteristic tester, with reference to national standards, original test component device, there are 2 sets of different stacked powder plates (A disk, B disk), all with loose density, fluidity, angle of repose (rest angle) ) detection. The conventional bulk density test method is to directly flow the powder material from the funnel into a standard container (30ml stainless steel cylinder)
Figure 2 Powder comprehensive characteristic tester
There are many factors affecting the bulk density of the powder, such as powder particle shape, size, surface roughness and particle size distribution. Usually these factors are significantly different depending on the method of preparation of the powder and the process conditions. In general, the powder bulk density decreases as the particle size decreases, the particle non-spherical coefficient increases, and the surface roughness increases.
Third, the tap density (also known as dense charge density, tight bulk density) is one of the important indicators of powder quality. Tap density measurement refers to the loading of a certain amount of powder into a container and regular vibration under certain conditions. As far as possible, the gap between the particles is compressed, and finally the gap between the particles cannot be reduced. When the volume of the powder in the container is no longer reduced, the volume of the powder is read, and then the weight of the powder is divided by the volume to obtain the density after tapping.
Tap density is essential for characterizing catalysts, foaming materials, insulating materials, ceramics, powder metallurgy, and other industrial products, especially in the battery industry.
Chengdu Jingxin JZ-7 and JZ-1 two tapping densitometers, users can choose according to their needs.
Figure 3 JZ-7 tap density meter
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