镁基非晶储氢合金的取代改性以及对高氯酸铵的分解催化效应的研究

摘要镁基非晶储氢合金与晶态的储氢合金相比，吸放氢动力学性能比较优异，吸氢温度较低，而且镁基储氢合金有储氢量大的优点，是极具发展潜力的新型储氢合金。本文以Mg-Ni储氢合金作为研究对象，采用合金元素取代改性的方法，在Mg-Ni合金的基础上掺入Al元素，采用机械合金化法制备了非晶态的Mg2Ni合金与Mg1.5A0.5-Ni和Mg1.75Al0.25Ni合金粉末，采用XRD，DSC，SEM等方法研究了合金的组织与微观结构，氢化效应及其对高氯酸铵（AP）热分解的催化作用。本文研究发现:68051

(1) 添加Al元素后，合金的非晶形成能力下降，且Al含量越高，非晶形成能力越低，合金 Mg1.75Al0.25Ni已基本完全非晶化；

(2) 添加Al元素可明显改善合金的吸放氢性能；

(3) 添加Al元素后，合金对（AP）有很好的催化作用，AP的表观分解热有明显的增加，高温分解温度降低。

毕业论文关键词: 镁基储氢材料非晶吸放氢性能高氯酸铵（AP）

毕业设计说明书（论文）外文摘要

Title Study on the element partial substitution to improve the characteristics of amorphous Mg-based hydrogen storage alloys and decomposition catalysis effect of ammonium perchlorate.

Abstract

Amorphous Mg-based hydrogen storage alloy, compared to crystalline hydrogen storage alloy, has better hydriding and dehydriding properties and the temperature of hydrogen absorption is lower. Especially Mg-based hydrogen storage alloy has the advantages of large amount of hydrogen storage, making it a great potential for development of new type of hydrogen storage alloys. In this paper, Mg-Ni hydrogen storage alloy, as the research object, is doped with Al element by the method of alloy elements replacing. Mechanical alloying was used to manufacture amorphous alloy Mg2Ni and alloy powder of Mg1.5A0.5-Ni and Mg1.75Al0.25Ni. The Mg-based alloy’s microstructure, hydrogenated effect and catalysis on Ammonium perchlorate (AP) thermal decomposition were researched, using XRD，DSC，SEM and other methods. This study found that:

(1) After the addition of Al element, alloy amorphous forming ability decreased, and the content of Al is higher, the lower the glass forming ability, Mg1.75Al0.25Ni alloy was almost completely amorphous;

(2) The addition of Al element can significantly improve the performance of hydrogen storage alloys;

(3) After the addition of Al element, alloy has excellent catalysis on AP, and the apparent decomposition heat of AP has increased significantly when its pyrolysis temperature has reduced.

Keywords: Mg-based hydrogen storage alloy; Amorphous; Hydriding and dehydriding properties; Ammonium perchlorate;

1 绪论 1

1．1 氢能系统的开发意义及应用前 1

1．2 储氢材料的开发现状 1

1. 3 非晶合金的结构特点 4

1. 4 Mg-Ni系非晶储氢合金的研究现状… 5

1. 5 本文主要研究内容… 10

2.实验方法 11

2．1 原材料的选取和样品的制备… 11

2．2 结构分析… 12

2．3 储氢性能测试… 12

2．3 高氯酸铵（AP）的热分解性能表征镁基非晶储氢合金的取代改性以及对高氯酸铵的分解催化效应的研究:http://www.751com.cn/cailiao/lunwen_76462.html