采用扩散烧结法制备了Mg2Ni0.75Cr0.25合金,然后与纳米TiO2颗粒混合球磨得到纳米复合材料.X射线衍射分析结果表明,纳米复合材料由Mg2Ni-Ni复相合金和纳米TiO2组成,平均晶粒度为24～35nm.纳米TiO2颗粒对Mg2Ni0.75Cr0.25合金储氢动力学性能的提高具有催化作用,降低了Mg2Ni0.75Cr0.25合金的吸、放氢温度,使纳米复合材料氢化生成焓明显降低.对纳米复合材料的储氢性能测试结果表明:添加1.5%(质量分数)TiO2的纳米复合材料在373K、4Mpa下5min内完成吸氢,并在463K、0.1Mpa下20min内完成放氢,最大放氢量为2.57%.
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