Patent ID: 6797403
Filing Date: 2004-09-28
Classification: H01M,Y02E,Y10T

Abstract:
A method of continuously producing a lead alloy strip having high initial tensile strength and elongation before yield greater than 40% for battery electrode plates comprising heating a lead alloy containing 0.05-0.09 wt % calcium, 0.6-1.8 wt % tin, 0.01-0.06 wt % silver and the balance lead to a temperature above the melting point of the lead alloy for feeding of the molten lead alloy to an extruder having a die block with a desired die profile, cooling the molten lead alloy below the melting point of the lead alloy, forcing the lead alloy through the die block at a pressure up to 2000 atmospheres to produce an extrusion with zero porosity having a desired strip profile and a homogeneous, equiaxed lead alloy grain structure, and rapidly cooling the extrusion while maintaining the extrusion under tension by quenching to acquire a strip having a homogeneous, equiaxed lead alloy grain structure with a predetermined grain size in the range of 10 to 300 microns.