ZrH2颗粒热分解行为及对泡沫铝元素分布的影响

›› 2010, Vol. 10 ›› Issue (2): 298-303.

ZrH2颗粒热分解行为及对泡沫铝元素分布的影响

李大武王克孙挺姚广春李杰

东北大学理学院东北大学理学院东北大学理学院东北大学材料与冶金学院东北大学理学院

收稿日期:2009-10-29 修回日期:2010-01-21 出版日期:2010-04-20 发布日期:2010-04-20
通讯作者: 孙挺

Thermal Decomposition Behavior of ZrH2 Particles and Its Effect on Distributions of Elements in Aluminum Foam

LI Da-wu, WANG Ke SUN Ting YAO Guang-chun LI Jie

College of Sciences, Northeastern University College of Sciences, Northeastern University College of Sciences, Northeastern University School of Material and Metallurgy, Northeastern University College of Sciences, Northeastern University

Received:2009-10-29 Revised:2010-01-21 Online:2010-04-20 Published:2010-04-20
Contact: SUN Ting

摘要/Abstract

摘要： 利用程序升温热重法研究了ZrH2颗粒在铝熔体中的热分解行为，考察了升温速率对其分解的影响，分析了分解过程中的动力学与热力学特征及发泡气体与铝熔体之间可能存在的反应，制备出了平均孔径1.3 mm的泡沫铝产品，研究了ZrH2颗粒在熔体中的分散对泡沫铝元素分布的影响. 结果表明，ZrH2于500℃出现较小的吸热峰，750℃时出现尖锐吸热峰；升温速率较低时，ZrH2的氧化符合化学反应控制模式，升温速率较高时，符合固体产物层扩散控制模式. Zr和Ca元素在泡沫铝中的分布有明显差别，气泡集体上浮是主要原因.

关键词: ZrH2, 热分解, 泡沫铝, 气固反应

Abstract: Thermal decomposition behavior of zirconium hydride was studied by using temperature-programmed thermogravimetry. The thermodynamic and kinetic characteristics and potential reactions in the foaming process were analyzed. The aluminum foam with small pore diameter was prepared. The effect of ZrH2 particles dispersion on elemental distributions in aluminum foam was investigated. The results indicated that decomposition behavior of ZrH2 was controlled by chemical reaction process under low heating rate, but controlled by diffusion of solid product under high heating rate. The distributions of metal elements were impacted by thermal decomposition of ZrH2, the bubbles floating upward led to the non-uniform distribution of Zr and Ca elements.

Key words: zirconium hydride, thermal decomposition, aluminum foam, gas-solid reaction

中图分类号:

TG146.2

李大武王克孙挺姚广春李杰. ZrH2颗粒热分解行为及对泡沫铝元素分布的影响[J]. , 2010, 10(2): 298-303.

LI Da-wu; WANG Ke SUN Ting YAO Guang-chun LI Jie. Thermal Decomposition Behavior of ZrH2 Particles and Its Effect on Distributions of Elements in Aluminum Foam[J]. , 2010, 10(2): 298-303.

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