Method of producing copper-chromium fusion alloys as contact material for vacuum power switches
US4537745A · kind A · utility
12Cited by
5References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1984 |
| Grant date | Aug 27, 1985 |
| Priority date | — |
| Expiry date | Jan 27, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/25
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of producing copper-chromium fusion alloys having a chromium content of at least 25% by mass and at most 60% by mass with a homogeneous macrostructure without lattice defects and without shrink holes or pipes, which can be used as contact material for vacuum power switches with breaking currents exceeding 10kA. According to the invention, during fusing of the starting material to the fusion alloy a superheating to at least 2000.degree. C. is obtained at least in a partial zone of the instantaneous melt volume. Thereafter the melt is cooled at a cooling rate such that no primary Cr precipitation or segregation occurs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.