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在氢气作为保护气氛条件下 ,用机械合金化方法制备成Mg Ni Cr2 O3 纳米晶复合物。该复合物具有很好的吸放氢性能 ,在球磨过程中能发生吸氢反应 ,经过较长时间球磨之后 ,基本能完成吸氢 ,其放氢温度也有所降低。该复合材料充氢量在 2 0 0℃可以于 5 0s内达到 6 .0 %以上 ;在 30 5℃ ,0 .1MPa下 ,放氢量在 5 0 0s内可达到6 .0 %以上。对该复合物的热力学性能进行了研究 ,测出了PCT曲线及吸放氢的生成热ΔH等数据 ,并分析了其吸放氢的机理。
In hydrogen as a protective atmosphere conditions, prepared by mechanical alloying Mg Ni Cr2 O3 nanocrystalline composite. The composite has good hydrogen absorption and desorption performance, hydrogen absorption reaction can occur in the milling process, after a long time after milling, the basic hydrogen absorption can be completed, the hydrogen desorption temperature is also reduced. The amount of charged hydrogen in the composite material can reach more than 6.0% within 50s at 200 ° C; and the amount of hydrogen released can reach more than 6.0% within 500s at 301 ° C and 0.01MPa. The thermodynamic properties of the composites were studied and the PCT curves and the ΔH data of hydrogen absorption and desorption were obtained. The mechanism of hydrogen absorption and desorption was also analyzed.