Method of manufacturing zinc-titanium mother alloy and manganese dry battery
AssigneesMitsui Mining & Smelting Co., Ltd., Matsushita Electric Industrial Co., Ltd.
InventorsHajime Murakami, Ryohei Ashihara, Kohei Kubota, Koichi Sato
Life of this patent
Estimating the term…
Abstract
The present invention provides a method of manufacturing a zinc-titanium mother alloy and a manganese dry battery having an anode zinc can prepared from the zinc-titanium alloy. The method comprises: adding spongy titanium to molten zinc; and melting the spongy titanium to alloy with the zinc at 500.degree. to 750.degree. C. for 0.5 to 6 hours, thereby to obtain a zinc-titanium alloy which contains 0.001 to 5% by weight of titanium. The anode zinc can prepared from the zinc-titanium mother alloy is substantially free from metallic titanium and intermetallic compounds having the Zn--Ti atomic ratio of not less than 1/2.
Claims20
A method of manufacturing a zinc-titanium mother alloy which comprises zinc as a primary constituent, comprising the step of:
- adding to said zinc spongy titanium as a titanium material.
A method of manufacturing a zinc-titanium mother alloy comprising the steps of:
- melting metallic zinc to obtain molten zinc,
- adding spongy titanium to said molten zinc, and
- melting said spongy titanium to alloy with said zinc at a temperature of 500.degree. to 750.degree. C. for 0.5 to 6 hours, thereby to obtain a zinc-titanium mother alloy which contains 0.001 to 5% by weight of titanium.
An anode zinc can for a manganese dry battery, said anode zinc can having a bottomed cylindrical shape and being composed of a zinc-titanium alloy that is free from intermetallic compounds Zn.sub.2 Ti, ZnTi, and ZnTi.sub.2 as well as a metallic Ti phase.
A manganese dry battery comprising an anode zinc can of a bottomed cylindrical shape, a cathode mixture which includes manganese dioxide as an active material and is contained in said anode zinc can, and a separator interposed between said anode zinc can and said cathode mixture, wherein said anode zinc can contains 0.002 to 0.4% by weight of lead, 0.001 to 0.005% by weight of titanium, and not larger than 50 ppm of iron as an accompanied impurity but is free from intermetallic compounds Zn.sub.2 Ti, ZnTi, and ZnTi.sub.2 as well as a metallic Ti phase.
A manganese dry battery comprising an anode zinc can of a bottomed cylindrical shape, a cathode mixture which includes manganese dioxide as an active material and is contained in said anode zinc can, and a separator interposed between said anode zinc can and said cathode mixture, wherein said anode zinc can contains 0.001 to 0.005% by weight of titanium and not larger than 50 ppm of iron as an accompanied impurity but is free from intermetallic compounds Zn.sub.2 Ti, ZnTi, and ZnTi.sub.2 as well as a metallic Ti phase.
Dependencies are inferred from the claim text.