Magnesium Based Composite Powder Stabilizing Treatment And Its Performance Study

In this paper several sorts of Stable Magnesium Composite Particles were prepared. The efficiency of stabilization treatment and different preparation technics were studied too.First, PVC and PMMA were found out as the coating material for their better inertness to Tec, and the PMMA is better. Studies showed that the toughness of copolymer is enhanced by adding VDC , the polymer film will be more symmetrical with the addition of AA.Second, method of Physical Liquid Deposition was better to prepare Stable Magnesium Composite Particles. Studies showed that it was easier to get more symmetrical and compact polymer film on the surface of Mg particles if the concentration of polymer solution was lower or the precipitator instilled more slowly. The hydroreactive would decline at higher temperature with the polymer film weight increased, but there was no influence when the temperature was low. There was no influence for pyrogenation performance in air atmosphere when the preparation technics changed.Third, Particles coated by PVC,P(MMA-VDC) showed lower stabilization at low temperature(25℃), but showed high hydro reactive at higher temperature. Particles coated by PMMA,P(MMA-AA) showed very high stabilization at low temperature(25℃), and particles coated by PMMA showed low hydroreactive at higher temperature, particles coated by P(MMA-AA) showed high hydroreactive at higher temperature.Fourth, the better condition to prepare the stable magnesium composite particles which show high performance is that: coated by P(MMA-AA), MMA:AA=99:1(mol/mol), concentration of polymer solution is 1.7g/L, instilling at the velocity of 0.4ml/min, weight percent of polymer film is controlled by 0.5%. This sample shows barely reaction with water in 25℃, and has a intense reaction with water at the temperature of 50℃. The burning point is 624.5℃, about 45℃higher than pure Mg powder but 8℃lower than active magnesium composite particles.