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Third group to improve the study of Al, Pb interfacial bonding material properties

Author: ZhouShengGang
Tutor: ZuoPeiXian
School: Kunming University of Science and Technology
Course: Materials Physics and Chemistry
Keywords: Electrode material Layered Composite The third group Thermophysical temperature field Al-Pb immiscible system
CLC: TG146.21
Type: Master's thesis
Year: 2009
Downloads: 15
Quote: 0
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Abstract


Hydrometallurgical industrial areas, lead and lead alloys as the insoluble anode materials are still widely used in electrolytic Cu, Zn production, but because of the easy creep of the lead electrode in the electrolyte resistivity, etc. drawbacks, consumption of the anode material, and impact on the anode life. Therefore, with the current economic and social development of the production and living, energy conservation, energy requirements, urgently requires the preparation of a comprehensive performance superior new electrode material, but metal layered composite electrode material can give full play to the performance of each of the different metals advantage, and learn from each other, in order to obtain enhanced catalytic performance, more stable electrochemical properties of new electrode materials. However, at home and abroad is not much metal layered composite electrode materials reported. This topic, \positive significance. Research work and results include: (1) based on the alloy phase diagram, the key parameter function theory, electronegativity difference theory, atomic size difference analysis Preparation of Al-X-Pb layered composite thermodynamic feasibility, and optimize a species of the third group of transitional substances Me; (2) application of Al, Me, Pb ternary mixtures Gibbs free energy calculation method, through the establishment of a MATLAB function to calculate the model, find the preparation process temperature range when Al, Me, Pb group points content (at.%): 0.42%, 73.55%, 26.03%, and the mixing temperature is 753.15K when Al, Me, Pb ternary mixing Gibbs free energy minimum is about -5.33 × 104J/mol MATLAB drawing tools surf () plotted binary function image were checking to confirm the correctness of a layered composite model from a theoretical point of view; (3) interface the pretreatment and composite casting temperature field of thermophysical prepared Al-Me-Pb layered composite morphology analysis, Phase analysis and mechanical testing, the research interface elements diffusion distribution, the thickness of the diffusion layer and regulation method. The results showed that the introduction of a third metal, which greatly improved the bonding strength of Al, Pb (tensile shear, three-point bending strength), the realization of Al and Pb metallurgical binding, while between the three groups interdiffusion exacerbated as the temperature increases, the interfacial layer thickness is also formed gradually thickens interface presents a more uniform width wavy distribution; (4) further measure interfacial resistivity values, and analysis of the interface resistance with the preparation The variation of the process temperature, provides a way to improve the electrical conductivity by adjusting the process parameters. Found that its interfacial resistivity than Pb slightly larger, but due to the thickness of the interfacial layer is less than 10μm thick, coupled with the introduction of the Al substrate is used as the inner core, and the whole, so that the resistance of the interface has been greatly improved. The layered composite material for further research and development work and application prospects of Al-x-Pb preliminary discussions with the outlook, provided a scientific method for the preparation of a new type of layered composite electrode materials.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Light non-ferrous metals and their alloys > Aluminum
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