| 计算机机壳表面爆痘机理分析 |
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| 引用本文： | 卫英慧,侯利锋,阴国盛,郭跃文,胡兰青,许并社.计算机机壳表面爆痘机理分析[J].兵器材料科学与工程,2004,27(1):39-41. |
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| 作者姓名： | 卫英慧 侯利锋 阴国盛 郭跃文 胡兰青 许并社 |
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| 作者单位： | 太原理工大学,材料科学与工程学院,太原,030024;太原理工大学,材料科学与工程学院,太原,030024;太原理工大学,材料科学与工程学院,太原,030024;太原理工大学,材料科学与工程学院,太原,030024;太原理工大学,材料科学与工程学院,太原,030024;太原理工大学,材料科学与工程学院,太原,030024 |
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| 摘 要： | 某厂用AZ91D镁铝合金生产的手提计算机机壳 ,经精密铸造而成。在放置一段时间后 ,常常发生爆痘现象 ,用扫描电镜和红外光谱分析了这一现象。结果表明 ,氧化镁夹杂存在于镁铝合金中 ,它可以逐渐吸收空气中的水分 ,转变为氢氧化镁 ,发生极大的体积膨胀 ,从而引起爆痘。减少爆痘的根本方法是降低或消除MgO夹杂物的含量。
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| 关 键 词： | Mg-Al合金 失效分析 |
| 文章编号： | 1004-244X(2004)01-0039-03 |
| 修稿时间： | 2002年5月9日 |
Analysis of smallpox formation mechanism on surface of computer casing |
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| WEI Ying-hui,HOU Li-feng,YIN Guo-sheng,GUO Yue-wen,HU Lan-qing,XU Bing-she.Analysis of smallpox formation mechanism on surface of computer casing[J].Ordnance Material Science and Engineering,2004,27(1):39-41. |
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| Authors: | WEI Ying-hui HOU Li-feng YIN Guo-sheng GUO Yue-wen HU Lan-qing XU Bing-she |
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| Abstract: | A kind of pocket computer casing, made of AZ91D alloy, is manufactured by precision casting. When the computer casing was kept for some time, it was found that there were some smallpoxes on the surface of the casing. In the paper, the formation mechanism of the smallpoxes was investigated by means of scanning electron microscope and infrared spectrometer. It is concluded that MgO inclusions in Mg-Al alloy is an important factors which leads to formation of smallpoxes. MgO turns into Mg(OH) 2 by absorbing water in the air. Because of difference of density between MgO and Mg(OH) 2, volume expansion takes place inevitably. A basic way of reducing smallpoxes is to cut down content of MgO inclusions. |
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| Keywords: | Mg-Al alloy failure analysis |
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