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铜易被空气氧化,尤其在热加工过程中。铜的氧化动力学已有报道。加入稀土元素可提高铜在500~900℃时的抗氧化能力。本文研究了含轻稀土的铜在室温至熔化状态下的氧化过程,并对氧化膜的成分及氧化机理进行了探讨。 相似文献
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本文采用阿基米德法和扭摆坩埚法按照混料试验设计分别测定了NdF_3-LiF-BaF_2熔体的密度和粘度,获得密度、粘度与组成的数学表达式如下:ρ=11.325Z_1 13.478Z_z 11.694Z_3-8.081Z_1Z_2-4.980Z_1Z_3-0.392Z_2Z_3-7.331(g/cm~3),η=8.536Z_1 4.358Z_2 10.129Z_3-8.980Z_1Z_2-0.882Z_1Z_3 17.697Z_2Z_3-6.486(mPa·s)。Z_1为LiFwt%,Z_2=BaF_2wt%,Z_3=NdF_3wt%。 相似文献
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NaCl-NaF-RE2O3体系的表面张力和密度 总被引:2,自引:0,他引:2
Surface tension and density of NaCl-NaF-RE_2O_3 melts have been measured by means of maximum buble pressure and Archimedes methods. The results are expressed by two mathematic models. Mass fraction of RE_2O_3 in the melts from 0.0 to 0.6% and that of NaF/NaCl, 50—90%. This investigation shows that there might be complexes in the melts. The information obtained can be used as a reference in the preparation of Al-RE alloys. 相似文献
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