Dispersion And Performance Of The Nano Strontium Carbonate Study

In order to study and investigate the dispersion of nanosized strontium carbonate, nanosized strontium carbonate was prepared by using chemical method. The effect of preparation processing on dispersion such as surface-active agent,temperature and so on was considered. The best reaction conditions was acquired.Nanosized strontium carbonate and ammonium perchlorate (AP) were mixed by using ball milling machine, considering the parameter of ball milling on dispersion of strontium carbonate. The results indicated that the best condition was milling at 700 rpm, 50min, the ratio of ball and powder was 4:1.The catalytic effect of AP was investigated via DSC. The results indicated that the best dispersion composite is better than normal complex. The first thermal decomposition temperature of best dispersion composite is higher 4℃than decomposition temperature of normal complex.When content of strontium carbonate was increased, the thermal decomposition temperature of AP increased. When the content of strontium carbonate was 8wt%, the first decomposition temperature increased 22℃, also the second thermal decomposition temperature increased too. Nanosized strontium carbonate can anti-catalyze the first and second decomposition of AP effectly.Compared with the blank sample, when the nanosized strontium carbonate was added into the AP/HTPB composite solid propellant, the burning rate of solid propellant decreased substantially. At the pressure of 10MPa the burning rate decreased by 27.6% and the pressure exponents in the pressure scopes of 4～10MPa decreased by 66.1%. With the increasing of nip time, the burning rate of solid propellant decreased. Nipping with 3 hours decreased burning rate of solid propellant 2.56% than nipping with 2 hours. Also burning rate of composite catalyze is more better than separate catalyze, the largest decreased burning rate extent was 5.28%. Copper oxide and titanium dioxide had similar effects.To sum up, pre-dispersion approach and nipping time can improve drop-burning rate catalyst nanosized strontium carbonate's dispersion and increase the drop-burning effect on AP/HTPB composite solid propellant.