Method of making an article that comprises dispersion-hardened l

Details Method of making an article that comprises dispersion-hardened l Method of making an article that comprises dispersion-hardened l

1998-12-23

1999-10-12

Maples, John S.

Metal working

Method of mechanical manufacture

Electrical device making

29 2, 29 172, 29514, B21D 3900, H01M 422

Patent

active

059649046

ABSTRACT:
A lead-acid battery according to the invention contains an electrode grid structure that comprises dispersoid-containing lead having relatively high strength and good corrosion resistance. The dispersoid particles exemplarily are selected from the oxides, nitrides and carbides that are substantially insoluble in lead and in sulfuric acid of concentration suitable for use in a lead-acid battery. Significantly, the dispersoid-containing lead has average grain size of at least 20 .mu.m. In consequence of the relatively large grain size, the total length of grain boundaries exposed to electrolyte is relatively small, and corrosion resistance is improved. Exemplary techniques for forming the dispersoid-containing lead are disclosed.

REFERENCES:
English language abstract of Y. Ueda, et al, Journal of the Japan Institute of Metals, vol. 42(8), pp. 751-756, 1978, (no month).
V.V. Neverov et al., Soviet Powder Metallurgy and Metal Ceramics, vol. 31 (10), pp. 894-897, Oct. 1992.
D.H. Roberts et al., Metallurgia, Nov. 1964, pp. 223-227.
G.H. Reynolds, Scripta Metallurgia, vol. 8, pp. 781-784. Note: only p. 781 is currently available, Apr. 1974.
English language abstract of H. Unckel, Metall, vol. 35(7). pp. 553-558, (no date).
English language abstract of French Patent No. 1,480,049 (May 05, 1967).
English language abstract of French Patent No. 2,128,914 (Feb. 09, 1973).

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