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magnesium aluminum alloy powder is a special combustible material that is widely used in propellants, explosives and pyrotechnics. It has excellent combustion heat, fast burning speed and low oxygen consumption.
A new method for analyzing the sulfur removal efficiency of magnesium aluminum alloy powder is proposed. The method adopts the use of conventional instruments and equipment in a laboratory, is convenient to operate and has wide application. It eliminates the interference of aluminium to magnesium determination during EDTA titration and improves the efficiency of precipitation and washing filtration, so as to effectively increase the measurement accuracy.
In addition, this method also can accurately detect the contamination content of magnesium powder by using X-ray photoelectron spectroscopy (XPS). The surface film that forms on pure magnesium powders after sintering was analyzed, and a solution to remove it was proposed.
The surface film of sintering pure magnesium powder is the result of mutual attraction between the metal atoms in the solid state and water molecule, which is induced by heating. Heating enables atoms to obtain enough energy to migrate and fill the gaps between the particles. The temperature is raised higher and kept for a certain time.
During the compaction process, shear stresses break oxide layers on the powder surface and improve metallurgical bonding as well as produce foams. However, during uniaxial compacting, part of the generated gas during heating is lost. This leads to crack-like pores and unstable foams with low density.