热压烧结Al-Bi复合水反应材料组织与反应活性研究

Al-15Bi composite water-reactive materials were prepared by hot pressing sintering with mechanically mixed powder of Al and Bi as raw materials. The microstructure, water-reactive properties and reaction products of the materials were analyzed and characterized. The effects of temperature and KCl concentration on the reaction rate between Al-15Bi and water were analyzed, meanwhile the water reaction mechanism of Al-15Bi was explored, and the reaction model was established. The results indicate that the Al-Bi composite material with dense and uniform structure can be prepared at 550 ℃ and 40 MPa for 1 h. Bi in the material is distributed in a network at the interface of Al particles. The hydrogen production rate can be improved greatly by increasing the temperature. Al and Bi can form micro-galvanic cells in water, thereby promoting the reaction of Al and water.