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铝熔体泡沫化过程变化与胞状组织的演变 总被引:8,自引:0,他引:8
采用实时测量铝熔体发泡过程中体积变化的方法,对不同发泡时期形成的泡沫铝样品孔的结构分布进行了分析,研究了铝熔体泡沫化过程中熔体体积变化的规律以及胞状组织演变。 相似文献
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铝合金熔体处理的主要目的是提高熔体的变质效果及纯净度,本文论述了当前国内广泛使用的几种铝合金熔体变质处理及净化处理技术,重点介绍了活塞用近共晶铝硅合金熔体P变质处理及氮气--氯气混合气体+精炼剂复合净化处理技术在活塞铸造领域的应用。 相似文献
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铝熔体泡沫形成过程中粘度对孔结构影响 总被引:14,自引:0,他引:14
采用简便有效的测量搅拌电机功率的方法控制铝熔体泡沫化过程的粘度,研究了粘度、温度与孔结构的关系,随熔体表观粘度提高泡沫孔径变小。合适的表观粘度有利于提高泡沫孔径分布的均匀性、获得高的孔隙率、泡沫孔径随温度提高而增大。 相似文献
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随着我国对循环经济的日益重视,废铝的再生利用已成为铝工业发展中不客忽视的一个重要环节。回收废铝并用来重新制成铝坯料时,需要格外关注的是重熔熔体的精炼与纯净化处理。本文概述了LARS系统对铝熔体的精炼原理,并通过对其除氢、除杂效果的分析,总结出LARS技术在废铝回收领域的优势。 相似文献
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《Materials at High Temperatures》2013,30(4):649-655
AbstractThe oxidation of high purity nickel was studied between 600 and 1200°C for scale thickness between 1 and 30 µm. At or above 1100° C, the scale growth kinetics are strictly parabolic. The scales are then compact with columnar and facetted NiO grains. A more complex behaviour is observed below 1000°C: (i) for test temperatures between 1000 and 800°C, mass gain curves cannot be fitted to a parabola, (ii) different scale morphologies and microstructures are observed depending on scale thickness and temperature, (iii) a duplex scale is formed below 800°C. In addition to the possible effect of grain-boundary diffusion, the departure of growth kinetics from simple pure parabolic kinetics could be also related to the complex scale microstructure and its large evolution during scale growth. In situ oxidation of nickel specimens in an environmental SEM equipped with a hot stage specimen holder permitted to follow the morphological evolution of NiO scales. In situ grown NiO scales show the same microstructural features as observed on Ni specimens oxidised for longer duration in pure oxygen at atmospheric pressure. 相似文献