Papers by Keyword: Mg Powder

Abstract: To find out the influence of adhesives to Mg/PTFE pyrotechnic composition, 12 materials such as fluororubber, phenolic resin, etc as the adhesives component of pyrotechnic composition, and which burning speeds were measured by high-speed camera, and by the way, which burning temperatures were checked by infrared thermometer. In addition, the friction and impact sensitivities of compositions had been compared. The experiment results show that the Mg/PTFE pyrotechnic composition with adhesive of phenolic resin has the best performance, which burning temperature is 1268.4 °C, linear burning speed is 6.46 mm·s^-1, mass burning speed is 3.06 g·㎝^-2·s^-1.

Abstract: Porous mullite was prepared from a reactive mixture of Al metal powder and the fly ash produced by power plant. The sintering ceramics was characterized for the pore structure and phase identification studies. It was found that the sintered specimen expands at first (1300-1400°C) and then shrinks which was correspondence to the changing of open porosity. The expansion was attributed to the fact that the alumina produced from the oxidation reaction of Al powder made the volume larger than the starting mixtures. At 1550°C, it was inferred that the alkaline element in the fly ash made the mullite decomposed then destroyed the mullite structure. The SEM photographs suggested us that the pore diameter of the sintered ceramics might be adjusted by adding Al powder with different grain sizes. Moreover, because of the rod-like mullite produced in the pores, Mg metal addition could develop the further modification of the pore structure with similar porosity (47% at 1400°C/4h) compared with that (53%) with 0wt % Mg metal powders.