Method for measuring specific surface area of ​​metal powder (GB.T 13390-92)
1. This standard specifies the analysis and determination method of the specific surface area of ​​metal powder. This standard is applicable to the analysis and test of the specific surface area of ​​metal powder. The measuring range is Ol ～ 1000㎡ / g. The analysis and determination of the specific surface area of ​​non-metallic powders and microporous materials can also be used for reference. Multifunctional waterproof makeup bag, waterproof shopping bag, waterproof wash bag, waterproof mommy bag Dongguan Jinying Handbags Co.,Ltd , https://www.jinyingbag.com
2. The surface area measured in this standard is the total surface area of ​​the powder, including the approved open surface area where nitrogen molecules can enter the powder; it is different from the surface area determined by the air permeability method, which refers to the envelope surface area.
3. Principle When the sample is placed in a nitrogen system, it will be physically adsorbed at a low temperature. When the adsorption reaches equilibrium,
Measure the pressure and the volume of nitrogen adsorbed on the surface of the substance, calculate the amount of adsorbed gas Vm of the monolayer on the surface of the sample according to the BET equation, and then find the specific surface area of ​​the sample