Powder fluidity test - powder properties analysis solution - Database & Sql Blog Articles

Powder fluidity test

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Powder characterization solution

First, the characteristics of powder representation

The intelligent powder tester is a general term for instruments used to analyze the physical properties of powders. These devices are essential in solving common issues faced in the processing, storage, transportation, and silo management of powder materials. Understanding these properties helps improve efficiency and reduce operational problems in various industries.

The structure of the rat hole; if the compression arch is subjected to the pressure of the silo, the consolidation strength increases to cause arching; the arch-shaped materials interlock at the orifice bridge; the adhesive adheres to the arch moisture, and electrostatic adsorption causes the powder to stick more strongly to the silo wall, increasing the likelihood of arching; air pressure balance arch: when the unloading device is not properly sealed, a large amount of air leaks from the bottom into the chamber, balancing the upper and lower air pressure of the material layer; friction between the material and the solid walls, as well as between particles themselves, can also contribute to flow issues; in the design of the hopper, factors such as the size of the discharge opening, the inclination angle of the hopper wall, and the pressure exerted by the powder on the wall all play a role. Poor design can lead to significant operational challenges.

The different industry properties of the second powder

In the production processes of metallurgical and non-metallic bulk materials, such as in powder metallurgy, food, pharmaceuticals, metals, chemicals, agriculture, and other sectors, the flow of particulate matter is a critical aspect. This includes silo unloading, transport, mixing, fluidization, and solidification.

Gas separation, among other processes, requires careful analysis of the flow characteristics of particulate materials. This is crucial for preventing clogging and ensuring the uniformity and consistency of the components during handling.

Third, the analysis methods commonly used in powder flow characterization

There are multiple analytical methods used for characterizing powder flow. Based on common generalized approaches, we can categorize them into four main types: traditional quantitative methods, shear methods, tumbling methods, and yield stress methods. Each method has its own unique features and applications, which will be discussed in detail below:

3.1. Traditional quantitative methods

This method is currently the most widely used and is also the simplest and most intuitive measurement technique. It primarily evaluates the powder using the Karl index, with measurements including tap density, bulk density, angle of repose (item angle), wiper angle (flat plate angle), collapse angle, difference angle, mass flow rate, volume flow rate, dispersion, void ratio, and more. These parameters help comprehensively assess the flow conditions of the material using the Karl index and Hausnaby index.

However, these test items cannot accurately analyze the intrinsic properties of the powder, and there tends to be a high degree of variation in the results. While this method is suitable for rapid assessment and quality inspection, it provides limited data and may not be sufficient for in-depth analysis.