Method of joining silicon nitride to carbon steel
US6170734A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1999 |
| Grant date | Jan 9, 2001 |
| Priority date | — |
| Expiry date | Jul 23, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2237/72
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
This invention relates to a method of joining silicon nitride having on its surface a thin layer of active silicon metal to carbon steel, wherein the active silicon layer is formed through the thermal dissociation of silicon nitride(Si.sub.3 N.sub.4) into silicon(Si) and nitrogen gas(N.sub.2). The active silicon layer is directly joined to carbon steel via an induced eutectic melting reaction between the silicon (Si) an iron (Fe) of carbon steel, or via brazing of two materials Ag--Cu alloys. This joining process does not require the use of expensive Ag--Cu--Ti active brazing alloys containing an active metal (Ti) or a sputtering method designed to coat the active metals on surface of silicon nitride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.