Preparation Of HMX/Cu Composite Partcle By Electroless Plating Method And Its Performances Study

It is one way thad adding nano-catalyst to improve the combustion performance of solid propellant. Nano Cu is a good catalyst applied in solid propellant, it can catalyze fuel’s thermal decomposition that the fuel is in solid propellant (like RDX, HMX), oxidizing and binder agent. The traditional adding nano Cu’s method is to prepare nano Cu first, and studing catalyze fuel’s thermal decomposition though mix nano Cu with solid propellant, while this method can’t fully put the catalyst of nano Cu to good use. It can effectively improve the catalytic performance of nano Cu in solid propellant properties when the nano Cu loads on the soild particle’s surface of solid propellant with balance.The paper states the method that using copper sulfate as copper source and sodium hypophosphite as reductant to prepare HMX/Cu core-shell composite particles. Firstly, the optimization scheme of chemical plating HMX/Cu composite particles is CuSO·5H2O=3g/L, NaH2PO2·H20=33g/L, Na3C6H5O7·2H2O=23g/L, temperature=55℃and pH=8by orthogonal experimental design.Secondly, after the research about plating technology conditions, the result shows as follows:(1) HMX particle’s surface loads with a layer of trace Pd in balance under the active colloid palladium and it provides the catalytic active center for the following chemical plating reaction.(2) By SEM representation, The optimum technology of plating is when pH equals10, plating temperature is50℃and NaH2PO2·H2O=33g/L with copper sulfate and sodium citrate unchanged.Lastly, preparing HMX/Cu composite particle according the plating technology and the results for HMX/Cu composite particle SEM and DSC’s representation is that the laden Cu particle’s diameter is about80nm and the cladding of composite particle is uniform and well dispersed; the percentage of the prophase decomposition heat (PPH) of HMX/Cu increases from2.37%to97.29%and thermal decomposition peak moves to lower temperature35.53℃;the apparent activation energy of HMX/Cu composite particles decreases33.16kJ/mol compared with raw material HMX; analyzing the catalytic mechanism about nano Cu and putting forward the spatial distribution effect of catalyst.