The FBS-1001 multifunctional powder physical property tester (also known as the powder comprehensive property tester) is developed based on the requirements of the American ASTM D6393-99 standard (Standard Test Method for BulkSolids Characterization by Carr Indicators) and with reference to the main technical indicators of Chinese national standards GB/T 5162-2006/ISO 3953:1993 (Determination of tap density of metal powders), GB/T 1482-2010 (Determination of flowability of metal powders by standard funnel method), GB/T 1479.1-2010 (Loose density of metal powders - Funnel method), and GB/T 16913.3-2008 (Determination of loose density by natural packing method). It is used to evaluate the comprehensive physical properties of powders. Testing instruments.
Due to the fact that powder, whether in a stationary or flowing state, is a two-phase system. The characteristics of particles themselves and the friction between particles will produce some special flow characteristics. Studying these characteristics is of great significance for powder processing, transportation, packaging, storage and other aspects of work. The characteristics of this instrument are multi-purpose, flexible and diverse measurement conditions, easy operation, good repeatability, and suitability for multiple standards. The successful development of this instrument provides a new means for evaluating the comprehensive characteristics of powders in various fields such as scientific research and industrial production.
This instrument can directly test parameters such as tap density, bulk density, angle of repose, collapse angle, plate angle, dispersion, etc. of powders. By calculating the above test data, indicators such as difference angle, compressibility, porosity, uniformity, and agglomeration can be obtained. It can also obtain Karl index parameters such as flowability index and jet flow index by looking up the above parameters in the table.
2、 Instrument features:
The FBS-1001 multifunctional powder physical property tester is made of 304 stainless steel material to prevent rusting of the components from affecting the accuracy of the test. The instrument has added a Hall current meter function. The vibration amplitude of the compacted density can be adjusted from 1mm to 15mm. During the vibration process, the vibrating component rotates at a small angle to ensure the uniformity of the material. Three different volumes of measuring cylinders can be used for testing to cope with different samples. Different discharge funnels and measuring cups are equipped for different testing projects to ensure the accuracy of each testing project.
3、 Definition of Measurement and Calculation Items
1. Compaction density: Compaction density refers to the density of a powder after being loaded into a specific container and subjected to vibration under certain conditions, which destroys the voids in the powder and puts it in a tightly packed state. Generally, the compaction density of a powder is lower than the true density of a single particle in the powder.
The FBS-1001 multifunctional powder physical property tester provides the vibration density determination method specified in the American ASTM D6393-99 standard (Karl index) and the vibration density determination method specified in the national standard (determination of metal powder vibration density) GB/T 5162-2006/ISO 3953:1993.
2. Loose density: Loose density refers to the density of a powder that naturally fills a specific container under specified conditions. When testing loose density, no additional external forces such as vibration should be applied. This label is important for the design of storage containers and packaging bags.
The FBS-1001 multifunctional powder physical property tester provides three different standard measurement methods:
A) The loose density determination method specified in ASTM D6393-99 standard (Karl index) in the United States;
B) National standard GB 1479-2010 (Loose Density of Metal Powder - Funnel Method);
C) The method for determining the bulk density specified in GB/T 16913.3-2008 (Determination of Bulk Density by Natural Accumulation Method).
3. Angle of repose: The maximum angle formed between the free surface of a powder accumulation layer and the horizontal plane in a static equilibrium state is called the angle of repose. It is formed by naturally dropping powder onto a specific platform through a specific method. The angle of repose has the greatest impact on the flowability of the powder, and the smaller the angle of repose, the better the flowability of the powder. The angle of repose, also known as the angle of rest, natural slope angle, etc.
The FBS-1001 multifunctional powder physical property tester provides the determination method specified in the American ASTM D6393-99 standard (Karl index).
4. Collapse angle: When a certain impact force is applied to a pile of powder measuring the angle of repose, causing its surface to collapse, the bottom angle of the remaining powder cone is called the collapse angle.
The FBS-1001 multifunctional powder physical property tester provides the determination method specified in the American ASTM D6393-99 standard (Karl index).
5. Flat plate angle (spatula angle): The angle between the free surface (inclined surface) of the powder on the flat plate and the angle after vibration, obtained by lifting the flat plate buried in the powder vertically upwards, is called the flat plate angle. In the actual measurement process, the plate angle is expressed as the average of the angle at which the plate is lifted and the angle at which unstable powder is removed after the plate is impacted. The smaller the angle of the plate, the stronger the flowability of the powder. Generally, the angle of the flat plate is greater than the angle of repose.
The FBS-1001 multifunctional powder physical property tester provides the determination method specified in the American ASTM D6393-99 standard (Karl index).
6. Dispersion: It measures the ability of a powder to disperse, spray, or fluidized in various directions, and is called dispersion. The measurement method is to drop a 10 gram sample from a certain height and measure the percentage of the sample outside the receiving tray to the total sample. The dispersibility is related to the dispersibility, floatability, and splatter of the sample. If the dispersion exceeds 50%, it indicates that the sample has a strong tendency to splash.
FBS-The 1001 multifunctional powder physical property tester provides the measurement method specified in the American ASTM D6393-99 standard (Karl index).
7. Hall current meter: HYL-1001 multifunctional powder physical property tester is designed and produced according to the national standard GB 1482-84. This device is suitable for measuring the flowability of metal powders using the standard funnel method. Any powder that can freely flow through a standard funnel with an aperture of 2.5mm can use this device.
8. Differential angle: The difference between the angle of repose and the angle of collapse is called the differential angle. The larger the difference angle, the stronger the flowability and jet flow of the powder.
9. Compressibility: The ratio of the difference between the tap density and the loose density of the same sample to the tap density is called compressibility. Compression ratio, also known as compression ratio. The smaller the compression degree, the better the flowability of the powder.
10. Void fraction: Void fraction refers to the percentage of voids in a powder that accounts for the entire volume of the powder. The porosity varies due to factors such as particle shape, arrangement structure, and particle size of the powder. When the particles are spherical, the porosity of the powder is about 40%; When the particles are ultrafine or irregularly shaped, the porosity of the powder is 70-80% or higher.
11. Agglutination degree: Agglutination degree is the size of the mutual cohesion presented on the surface of powder particles. Generally, the agglomeration degree of dry powder is low.
12. Homogeneity: It is another manifestation of the agglomeration degree of powders. When the agglomeration degree of powders cannot be measured, homogeneity is used to indicate the strength of the powder's mutual agglomeration.
13. Liquidity index: The calculation method of liquidity index was determined by British Carr in the 1960s. After measuring a large amount of powder, he used a method similar to the comprehensive equal division in fuzzy mathematics to fuzzy quantify qualitative concepts. Simply put, the liquidity index is the weighted sum of indices such as angle of repose, compressibility, flatness angle, homogeneity, and cohesion.
14. Jet flow index: It is an indicator to measure the difficulty of dust generation in powder materials, and also a method to measure the difficulty of powder being liquefied by gas. Powder with strong jetting properties is prone to generate dust and can also be easily liquefied. The jet flow index is a physical index of liquidity index, collapse angle, differential angle, and dispersion.
4、 Main technical specifications of FBS-1001 multifunctional powder physical property tester