| In this dissertation, the Al/SiO2 composites were prepared. Then the catalyzers were loaded on the surface of the Al/SiO2 composites. The effects of thes two kinds of composites on the thermal deposition of AP were researched.In order to prevent aluminum powders being oxided in the air, superfine aluminum powders which had been managed were coated by a film of nano silica by means of sol-gel method. In the experiments, some facters such as the proportion of tetraethyl orthosiiicate to coupling agents(Q) and distilled water to tetraethyl orthosilicate(R),the concentration of ammonia,reaction time and reaction temperature were controlled. The characteristics of the composite powders were investigated by SEM, TG and XRD. The reault indicated that the aluminum were all coated by a compact nano-silica film(Q=5:1). The capability of preventing oxidation is obviously enhanced. The results of the DSC showed that the Al/SiO2 composites can make the peak of the high thermal deposition of the AP brought forward 3 7.24℃.Using the Al/SiO2 composites as the core particles, the Al/SiO2/Co-B noncrystall alloy composites and Al/SiO2/Co3O4 composites were respectively prepared by chemical reduction synthesis and liquid phase deposition. The results of the SEM indicated that the two kinds of catalyzers all can be evenly loaded on the Al/SiO2 composites. Compared with simplify mixing the components, by means of DSC, the Al/SiCVCo-B noncrystall alloy composites and Al/SiO2/Co3O4 composites could respectively make. To the samples which were simplify mixed, the peak of the high thermal deposition of the AP were brought forward 119.49℃ and 118.63℃, and the apparent deposition energy were 0.932kJ/g and 1.090kJ/g. |
