METHOD FOR DETERMINING ADHESION AND SELF-ADHESION OF LOOSE POWDER MATERIALS OF DIFFERENT DISPERSITY Russian patent published in 2024 - IPC G01N19/04 

FIELD: measurement.

SUBSTANCE: disclosed is a method of determining self-adhesion and adhesion of loose powder materials of different dispersion to be carried out on a device for measuring tensile strength of powders by the method of a split cylinder. Device makes it possible to measure strength of powder layers (self-adhesion), compacted under load from 5 to 100 kPa, in the range of strength from 0.03 to 5 kPa. Disclosed method of determining self-adhesion and adhesion of loose powder materials is applicable in range from 0.25 to 10 kPa. Self-adhesion and adhesion of powders is determined at temperature of 15–30 °C and relative air humidity of not more than 60 %, taking into account actual data for a specific climatic region, taking into account the hygroscopicity of loose powder materials, self-adhesion T₁ in g/cm² is calculated using the formula: where S₁ is the cross-sectional area of the sample of the powder material, equal to the cross-section of the tube along the inner diameter, cm²; F_b — ballast force — weight of tube with plunger and powder material held by adhesion and friction forces, g, adhesion T₂, in g/cm², is calculated by formula: where S₂ is the area of contact of the sample of the powder material with the surface of the cup, cm².

EFFECT: development of a method which enables to determine two main characteristics of powdered loose materials of different dispersity, having high hygroscopicity, in the strength range from 0,25 kPa to 10 kPa — adhesion of particles to the surface of solid substrates and self-adhesion of contacting particles to break the bond required for their separation.

3 cl, 5 dwg