Brazing flux
US5171377A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Nov 30, 1990 |
| Grant date | Dec 15, 1992 |
| Priority date | — |
| Expiry date | Nov 30, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K35/361
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A brazing flux comprises cesium fluoride, aluminum fluoride, and crystalline aluminum hydroxide or aluminum oxide or both which form a crystalline compound having the following composition and containing cesium in the form of a complex salt: EQU x.multidot.CsF-y.multidot.AlF.sub.3 -1/2.multidot.z.multidot.[Al.sub.2 O.sub.3 .multidot.nH.sub.2 O and/or Al.sub.2 O.sub.3 ] where x+y+z=100, x/y.ltoreq.3, 42.ltoreq.x.ltoreq.66, and z.gtoreq.2 in terms of mol %. The crystalline compound has a melting point of 440.degree. to 580.degree. C. The brazing flux is non-corrosive and safe to use, and well suited for a brazing aluminum materials with a high magnesium content and also for torch brazing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.