Nano-boron Alloy / Aluminum Composite Metal Powder Preparation Technology Research

In this article, Ni-B/Al and Co-B/Al composite particles were prepared by means of electroless planting method. Based on the studing of influent factor in the reaction process, the good craft parameter of preparing composite particles are finded out, and Ni-B/Al and Co-B/Al nano-composite particles are obtained. The characteristics of the composite partilces, including surface morphology, structure and surface components, were investigated by XRD, SEM, EDS and BET. The compoundings of AP with composite paiticles are prepared by means of solvent-nonsolvent method. DSC-TG is applied on the compoundings to analyse the catalysis of the composite particles. While the composite particles are also applied in the propellant and characterized. The results are shown as follows:1. Ni-B/Al and Co-B/Al composite particles are prepared succeesfuly. Through applied SEM to characterize those composite particles, result indicate that there are compact and well-proportioned film on aluminium powders' surface. The results of XRD indicate that the films which are on aluminium powders' surface are noncrystal.2. The main preparation craft parameters of Ni-B/Al composite particle are reached. While raw materils of KBH₄, NiCl₂ and ethylenediamine are 1.5g·L^-1, 0.1mol·L^-1 and 60ml·L^-1, respectively. To get satisfied products, the reaction should be last 1h with said raw materials concentration under 50℃ temperature and 11 of pH value.3. The main preparation craft parameters of Co-B/Al composite particle are reached. While raw materils of KBH₄, C0Cl₂ and natrium-tartrate are 1.2g·L^-1, 0.12mol·L^-1 and 40g·L^-1, respectively. To get satisfied products, the reaction should be last lh with said raw materials concentration under 40 ℃ temperature and 12 of pH value.4. The composite particles we prepared can result to observably decreaseing of the thermal decomposition peak of AP. While the thermal decomposition peaks of AP contained Co-B/Al are decrease 62.8℃, those with Ni-B/Al composite particles are decrease 85.4℃. Both kind of composite particles are lead to the peak of the low and high decomposition of AP overlapping. This phenominia may result to more energies releaseing of AP.5. When applied composite particles to propellant, the peaks of the thermal decomposition of propellant decrease too. The peaks of the thermal decomposition of propellant contained Co-B/Al decrease25.5℃, while those contained Ni-B/Al decrease 29.2℃.