铝在镁铝合金HCS过程中的物相演变研究任务书
2020-05-26 20:28:20
1. 毕业设计(论文)的内容和要求
mg由于储氢量高(mgh2的理论储氢量为7.6 wt.%)、资源丰富,被视为一种很有应用前景的储氢材料。
但纯mg在吸放氢过程中热效应显著(吸氢过程为放热反应,放氢过程为吸热反应)、氢化物形成焓较高(mgh2的形成焓为74.7 kj/mol)、动力学缓慢等问题一直是限制其实用化进程的关键。
本文选择mg-al合金作为研究对象,是因为mg-al合金能够与氢发生可逆的歧化氢化反应,生成mgh2和al,原位生成的al具有良好的热传导性能(al的导热系数为235 w/(m k),mg的导热系数为160 w/(m k)),能在放氢过程中起关键作用:一方面有效促进热量的传递,显著提高mgh2放氢动力学;另一方面al通过与mg合金化,使mg-h键失稳,从而降低mgh2的脱氢焓,改善放氢热力学性能。
2. 参考文献
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3. 毕业设计(论文)进程安排
2015.12.22~ 2015.12.31:中国期刊网、维普数据库以及Elsevier数据库等数据库查阅国内外相关文献; 2016.1.04 ~ 2016.1.15:撰写开题报告,开题报告答辩; 2016.3.14 ~ 2016.4.5:探索采用氢化燃烧合成法制备镁铝合金工艺; 2016.4.6 ~ 2016.4.19 :中期检查与答辩; 2016.4. 20~ 2016.5.10:测试、分析在HCS过程中产物的物相转变过程; 2016.5.11 ~ 2016.5.15:阅读相关文献,结合实验分析手段,对该现象做出合理解释; 2016.5.16~ 2016.5.29 :撰写毕业论文; 2016.5.30~ 2016.6.5:完成毕业论文及答辩; 2016.6.6~ 2016.6.14:总结、归档。