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Electrical contact material
| Details |
Inventors: Santala, Teuvo J.; Hirsbrunner, Hans G.;
Assignee: Texas Instruments Incorporated (Dallas, TX)
Primary Examiner: Padgett; Benjamin R.
Assistant Examiner: Parr; E. Suzanne
Attorney, Agent or Firm: McAndrews; James P.
An electrical contact material comprises from about 85 to 87.5 percent silver and from about 0.01 to 0.10 percent cobalt in the form of an oxide, by weight. The material also comprises from about 10.73 to 12.82 percent cadmium oxide, from about 1.6 to 2.0 percent zinc oxide, and from about 0.15 to 1.0 percent lead oxide, by weight, internally oxidized in situ in the contact material in an oxygen enriched atmosphere. |
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DETAILED DESCRIPTION We claim: 1.
An electrical contact material comprising from 85 to 87.
5 percent silver, by weight and from 0.
01 to 0.
10 percent cobalt oxide, by weight, and from 10.
73 to 12.
82 percent cadmium oxide, from 1.
6 to 2.
0 percent zinc oxide and from 0.
15 to 1.
0 percent lead oxide by weight, internally oxidized in situ in the contact material in an oxygen enriched atmosphere.
2.
An electrical contact material as set forth in claim 1 comprising about 85 percent silver, by weight, and from 11.
98 to 12.
82 percent cadmium oxide, 0.
02 percent cobalt oxide, 2.
00 percent zinc oxide, and from 0.
16 to 1.
0 percent lead oxide, by weight, internally oxidized in situ in the contact material in an oxygen atmosphere.
3.
An electrical contact material comprising a layer of electrical contact mterial as set forth in claim 2 metallurgically bonded to a layer of fine silver.
4.
An electrical contact material as set forth in claim 1 comprising about 87.
5 percent silver, by weight, and 0.
02 percent cobalt oxide, about 10.
73 percent cadmium oxide, 1.
6 percent zinc oxide, and 0.
15 percent lead oxide, by weight, internally oxidized in situ in the contact material in an oxygen atmosphere.
5.
An electrical contact material comprising a layer of electrical contact material as set forth in claim 4 metallurgically bonded to a layer of fine silver.
Description:
When electrical circuits carrying substantial loads are opened and closed by engagement and disengagement of electrical contacts, high temperatures and substantial electrical arcing occurs between the contacts.
This tends to result in splattering of molten metal from the contact surfaces and to cause erosion or wearing away of the contact surfaces.
On reengagement of the contacts after such arching there is also a tendency for surfaces of the mating contacts to weld together so that substantial forces may be required in reopening the contacts.
When substantial erosion of the contact surfaces has occurred, the contacts usually have to be replaced and, where there is substantial welding, catastrophic failure can occur
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