Electrolytically rhenium coated molybdenum current inlet conductor assembly for vacuum lamps
US4559278A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1983 |
| Grant date | Dec 17, 1985 |
| Priority date | — |
| Expiry date | Sep 19, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12826
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a current inlet conductor assembly particularly for vacuum devices, especially for light sources such as incandescent lamps or discharge tubes, comprising an inlet conductor made of molybdenum for passing electric current and being surrounded by a vitreous material forming a hermetic seal therewith and an intermediate metal coating covering the surface of the inlet conductor at least on the places to be welded. The essence of the invention is that the intermediate metal coating is made of rhenium, advantageously with a thickness from 3 to 1200 nm. As proposed, the intermediate rhenium layer should be produced by electrolytic deposition, especially from an aqueous solution. The current inlet conductor as invented is very well weldable on the surfaces coated with rhenium, which also ensures good hermetic sealing with a vitreous material and is resistent to reducing environments, such as a hydrogen atmosphere during heat treatment, and can be prepared by a cheap and relatively simple method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.