Sintered composite materials for electric contacts in power technology switching devices and process for producing them
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United States of America Patent
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Jan 23, 1996
Grant Date -
N/A
app pub date -
Jul 18, 1994
filing date -
Jan 24, 1992
priority date (Note) -
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Abstract
Contact materials with the composition AgSnO.sub.2 Bi.sub.2 O.sub.3 CuO have proven themselves, particularly for low-voltage switching devices. These materials can contain an additive of other metal oxides. In addition to the required useful lifetime and suitable excess high temperature behavior, such materials are also supposed to fulfill all the requirements under short-circuit current stress. This is accomplished, according to the invention, in that the additional metal oxide is separately added stannic oxide and/or iron containing at least one element of the sixth sub-group of the periodic system. In the sintered composite material according to the invention, the other metal oxide is particularly ferric tungstate (FeWO.sub.4). Preferably, separately added SnO.sub.2 is present in combination with FeWO.sub.4. To produce such a sintered composite material, an internally oxidized alloy powder is produced from an AgSnBiCu alloy and mixed with the powder of the additional metal oxide or metal oxides, and the powder mixture is processed to yield molded elements with a residual porosity of less than 1.5%, using production steps from sintering technology.
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