| SiO2/TiH2包覆粉体的制备及其释氢特性 |
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| 引用本文： | 方吉祥,杨志懋,丁秉钧.SiO2/TiH2包覆粉体的制备及其释氢特性[J].高等学校化学学报,2005,26(7):1225-1227. |
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| 作者姓名： | 方吉祥 杨志懋 丁秉钧 |
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| 作者单位： | 西安交通大学理学院,金属材料强度国家重点实验室,西安,710049 |
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| 摘 要： | 熔体发泡法因可通过其简单的工艺制备高强度的泡沫铝而受到广泛的关注．TiH2颗粒可以作为泡沫铝的发泡剂，但其仍存在分解温度与铝熔点的温度失配问题．这种温度失配是导致泡沫铝制品孔洞结构难以控制的最大障碍，解决办法之一是延迟TiH2的分解过程．
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| 关 键 词： | 包覆 SiO2/TiH2颗粒 释氢特性 泡沫铝 |
| 文章编号： | 0251-0790(2005)07-1225-03 |
| 收稿时间： | 2004-10-09 |
Coating Process of Silica Film on TiH2 Particles and Hydrogen Release Characteristics |
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| FANG Ji-Xiang,YANG Zhi-mao,DING Bing-jun.Coating Process of Silica Film on TiH2 Particles and Hydrogen Release Characteristics[J].Chemical Research In Chinese Universities,2005,26(7):1225-1227. |
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| Authors: | FANG Ji-Xiang YANG Zhi-mao DING Bing-jun |
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| Institution: | State Key Laboratory for Mechanical Behavior of Materials, School of Science, Xi'an Jiaotong University, Xi'an 710049, China |
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| Abstract: | The coating process of TiH2 particles with SiO2 layers, and the effect of the coating layer on hydrogen release characteristic of TiH2 powders were studied experimentally. The gelation rate of silicic acid is an important factor for controlling the surface morphologies of coating layers. When the concentration of SiO2-3 is about 0.5 mol/L, the condensation rate of silicic acid is appropriate for the formation of a homogeneous and dense coating membrane. The results of hydrogen release at 700 ℃ show that TiH2 particles coated with silicon dioxide layers can efficiently delay the starting time of hydrogen release of TiH2 powders to 60-100 s. |
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| Keywords: | Coating SiO_2/TiH_2 particle Hydrogen release characteristics Al foams |
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