METHOD FOR PRODUCING Ag−OXIDE BASED ELECTRIC CONTACT MATERIAL AND ITS PRODUCT

Title:

METHOD FOR PRODUCING Ag−OXIDE BASED ELECTRIC CONTACT MATERIAL AND ITS PRODUCT

Document Type and Number:

WIPO Patent Application WO/2004/016818

Kind Code:

A1

Abstract:

Although an Ag−CdO based material has excellent electrical characteristics, e.g. fusion resistance, arc consumption resistance, low contact resistance, and the like, required for electric contact, Cd tends to take a direction of disuse as can be seen from national emission standard or waste electric electronic equipment (WEEE) ordinance of EC. The method for producing an Ag−oxide based electric contact material is characterized in that an Ag rich layer produced on the uppermost surface and an oxide aggregation layer directly under the Ag rich layer are suppressed and a composite oxide of an additive element is deposited and distributed uniformly and finely up to the inner tissue deep layer by raising the temperature gradually from a level not higher than 200&ring C to an upper limit of 700&ring C in a pressurized oxygen atmosphere of 5kg&sol cm²−50kg&sol cm² after replacing the atmosphere in a pressure oxidation furnace by oxygen thereby internally oxidizing an internal oxidative Ag alloy produced under conditions of cold working rate of 50%−95%.

Inventors:

SATO SADAO (JP)
KUMITA HIDEO (JP)
TSUDA KOHEI (JP)
YAMASHITA MITSUO (JP)
SHIOKAWA KUNIO (JP)
KAMIURA KENICHI (JP)
SEKIGUCHI KIYOSHI (JP)

Application Number:

PCT/JP2002/008294

Publication Date:

February 26, 2004

Filing Date:

August 15, 2002

Export Citation:

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Assignee:

TOKURIKI HONTEN KK (JP)
FUJI ELECTRIC CO LTD (JP)
SATO SADAO (JP)
KUMITA HIDEO (JP)
TSUDA KOHEI (JP)
YAMASHITA MITSUO (JP)
SHIOKAWA KUNIO (JP)
KAMIURA KENICHI (JP)
SEKIGUCHI KIYOSHI (JP)

International Classes:

C22C32/00; B22F1/145; C22C1/10; C22C5/06; H01H1/023; H01H1/0237; H01H11/04; H01L21/00; (IPC1-7): C22C1/10

Foreign References:

JPS542234A	1979-01-09
JPS59219432A	1984-12-10
JPS62241207A	1987-10-21
JPS58100650A	1983-06-15
JPH0989727A	1997-04-04

Other References: