通过相图计算和气体雾化的方法,设计并制备Al-10Bi-7Zn和Al-10Bi-7Zn-1.5X(X:Cu,Fe,Ni)(质量分数,％)复合粉体.研究Cu、Fe和Ni对Al-Bi-Zn基复合粉体水解制氢性能的影响.通过X射线衍射(XRD)和扫描电子显微镜(SEM)以及能量色散谱(EDS)分析对粉体的组成和形貌进行表征.水解制氢性能测试结果表明,添加Cu、Fe或Ni可以改变Al-10Bi-7Zn三元合金复合粉体的制氢速率,并且提高其抗氧化性能.在四元复合粉体体系中,Al-10Bi-7Zn-1.5Ni表现出最佳的制氢性能,在60 ℃下与蒸馏水反应时,500 min内的产氢率为 75.3％(954.1 mL/g),在储存 7 d 后(30 ℃,相对湿度 60％),1500 min 内保持 57.9％(733.7 mL/g)的产氢率.此外,机理研究表明,在Al-Bi-Zn基复合粉体中添加Cu、Fe或Ni可以稳定Al基体,抑制复合粉体在空气中的开裂,保持粉体的高活性.
Abstract
Al-10Bi-7Zn and Al-10Bi-7Zn-1.5X(X:Cu,Fe,Ni,in wt.％)composite powders were designed and prepared through phase diagram calculation and gas atomization method.The effects of Cu,Fe,and Ni on the hydrolysis of Al-Bi-Zn-base composite powders for hydrogen production were investigated respectively.The composition and morphology of powders were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM)with energy disperse spectroscopy(EDS)analyses.Hydrolysis performance test results indicate that the additions of Cu,Fe,or Ni can modify the hydrogen production rate and enhance oxidation resistance in Al-10Bi-7Zn ternary alloy composite powder.In the quaternary composite powder system,Al-10Bi-7Zn-1.5Ni(wt.％)exhibits the best performance with the hydrogen generation yield of 75.3％(954.1 mL/g)within 500 min when reacting with distilled water at 60 ℃ and maintains a hydrogen yield of 57.9％(733.7 mL/g)within 1500 min after being stored(30 ℃,relative humidity of 60％)for 7 d.In addition,the mechanism investigation suggested that the additions of Cu,Fe,or Ni in Al-Bi-Zn-base composite powders can stabilize the Al matrix to retain the high activity of powders resulting from inhibiting the cracking of composite powders in the air.
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