The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 09, 2001
Filed:
Jul. 23, 1999
Jae Do Lee, Daejeon, KR;
Young Min Choi, Daejeon, KR;
Korea Research Institute of Chemical Technology, Daijeon, KR;
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,N,) into silicon(Si) and nitrogen gas(N,). 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.