Non-hygroscopic welding flux binders
US4557768A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1984 |
| Grant date | Dec 10, 1985 |
| Priority date | — |
| Expiry date | Nov 19, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K35/3613
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A welding flux binder is provided which comprises an alkali-alkaline earth silicate hydrolyzed and polymerized from tetraalkylorthosilicate, Si(OR).sub.4, wherein R is --CH.sub.3, --C.sub.2 H.sub.5, or --C.sub.3 H.sub.7, and alkali and alkaline earth salts. The reaction product of the tetraalkylorthosilicate and metal salts, M.sub.2 O.M'O.SiO.sub.2, where M is potassium, sodium or lithium, and M' is magnesium, calcium or barium, has several advantages as a welding flux binder. For example, it is not hygroscopic and can be prepared at low temperatures since the alkali ions lower the melting point for viscous sintering of the gel phase. Because of the low temperature processing, a wide variety of solid additives with low thermal stability, such as some metals, carbonates, and fluorides, can be incorporated into the flux. Other dopants may also be readily incorporated into the binder during the gel phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.