液相分离型Al基水解制氢复合粉体的设计、制备及其性能研究

本项目以设计和制备一体化为主要学术思想，在合金设计的基础上，利用液相分离的特性制备兼有高活性和高抗氧化性的Al基水解制氢复合粉体。首先基于实验测定的相平衡结果与文献报道的相图信息，建立液相分离型Al-Bi-Sn-Zn-Cu-Fe-Co-Ni多元系合金的热力学数据库。在此基础上，对液相分离发生的成分和温度范围进行预测，并计算两液相的体积分数以实现组织形态的设计。利用雾化制粉技术，制备不同包裹程度的Al基水解制氢复合粉体，并考察合金成分、液相的体积分数和两液相间的界面能差异等因素对复合粉体组织形态的影响，揭示复合粉体多种组织形态的形成机理及其控制条件。进而系统研究复合粉体的制氢性能、抗氧化性及其影响因素，揭示水解反应的机理，制备出兼有高活性和高抗氧化性的Al基水解制氢复合粉体材料。

The main academic thinking of this project is the integration of design and experiment. Based on the material design, the Al-based hydrolysis hydrogen generation composite powders with high hydrolysis activity and oxidation resistance properties are prepared by using the properties of liquid phase separation. By making use of the experimental data of the phase equilibria and the related information of phase diagrams in the literatures, the thermodynamic database of liquid-phase-separated Al-Bi-Sn-Zn-Cu-Fe-Co-Ni multi-component system is established. The microstructures of Al-based composite powders are designed based on the composition and temperature ranges of stable miscibility gap of liquid phase obtained from the calculated phase diagrams. Afterwards, the composite powders with different degree of coating are prepared by the gas atomization technique. With studying the effect of some parameters such as the alloy composition, liquid volume fraction, the difference of interfacial energy on the morphology of solidification，the formation mechanism and control conditions of the composite powders can be revealed. Systematic investigation of the hydrolysis properties, oxidation resistance properties of the composite powders is carried out, and the hydrolysis reaction mechanism will also be studied. Finally, the Al-based hydrogen generation composite powders with high hydrolysis activity and oxidation resistance properties are developed.