The Properties of Hardened Lead
Journal Title: Analele Universitatii "Dunarea de Jos" din Galati. Fascicula IX, Metalurgie si Stiinta Materialelor - Year 2005, Vol 28, Issue 1
Abstract
Lead hardened through oxide scattering is investigated as raw materials for the fabrication of the support gratings of lead accumulators in order to increase their life service. For the preparation of lead powder hardened through oxide scattering we used air jet pulverisation, a technique specific to powder metallurgy. Two research approaches are presented in the paper: one in which the oxide was introduced through oxidised lead powder, and the other in which additional lead oxide was introduced. Oxide dispersion into metallic matrix was achieved by pronounced deformation through extrusion of the powder. During extrusion, the particles are compelled to pass through the mould calibration zone and consequently they are considerably deformed. As an effect of this deformation, the particles of fragile oxide which cover the lead powder particles are crashed and carried away to the material flowing through the matrix longitudinally on the extruded semi-product. The content of oxide introduced in matrix by the oxidised lead powder depends on the powder particle size. This paper presents the effect of the powder particle size and oxide phase dispersion in the metallic matrix on the mechanical, chemical and electrical properties of the extruded semi-products. The semi-products made from lead powder belonging to the grain size class of < 40 μm and oxide particles allowance have the highest mechanical resistance and the best corrosion behaviour. Using controlled oxidised lead powder better extruded semiproducts are obtained in terms of mechanical resistance, corrosion behaviour and electrical conductivity as compared with lead and Pb-Sb alloy. A higher electrical conductivity represents an important advantage especially for the starting accumulators where the voltage fall should be as low as possible.
Authors and Affiliations
Florentina POTECAŞU, Octavian POTECAŞU, Elena DRUGESCU
Vaporisation of the Metallic Bath Component During Refining in Oxygen Converter
The paper presents a series of researches regarding the vaporization of the component elements of the metallic bath and slag during refining in LD converter. Also, the main factors which influence the vaporization proces...
Morphology of Nickel Matrix Composite Coatings with Nano- Silicon Dispersion Phase
In this paper is presented the morphology of nickel metal layers, nickel matrix composite and particles dispersed phase, obtained by electrodeposition on steel base, using nickel sulphate as electrolyte. Nickel anodes us...
The Influence of the Carbon Content on the Depth of the Carbonitrurat Layer in Fluidized Layer for 1C15, 1C25 and 1C45 Steels
This paper presents the experimental research of carbonitriding thermochemical processing in fluidized layer performed on some samples of carbon steel with different carbon contents, the fluidized layer being made up of...
Nanostructured Surface for 38MoCrAl09 Steel by Nitriding in Nitrogen Atmosphere and YAG:Nd Pulse Laser Activation
YAG:Nd pulse laser is usually used for cutting and welding. The paper is based by experiments using YAG:Nd pulse laser (KVANT 17-CIS made). Technological modules were assembled for laser beam deviation and for relative s...
Static and Dynamic Analysis of Stress and Deformations of Răstoliţa Dam
Large Dams are a particularly important case of seismic risk assessment. On the one hand, the dams themselves have a high value, having implications for the whole economy, through the production of electricity, water sup...