US2003134737A1PendingUtilityA1

Silicon nitride substances containing sintering additives and sio2, method for producing them and use of the same

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Priority: Oct 20, 1997Filed: Oct 7, 1998Published: Jul 17, 2003
Est. expiryOct 20, 2017(expired)· nominal 20-yr term from priority
Inventors:Gerhard WottingMathias HerrmannGrit MichaelStefan G. SiegelLutz Frassek
F16C 33/043C04B 35/584C04B 35/593C04B 35/5935C04B 35/6261C04B 35/6265C04B 35/62665C04B 35/62685C04B 35/62807C04B 2235/3217C04B 2235/3225C04B 2235/3232C04B 2235/3244C04B 2235/3256C04B 2235/3258C04B 2235/3418C04B 2235/3826C04B 2235/3856C04B 2235/3865C04B 2235/3869C04B 2235/3886C04B 2235/3891C04B 2235/3895C04B 2235/483C04B 2235/5409C04B 2235/5445C04B 2235/6587C04B 2235/77C04B 2235/80C04B 2235/85C04B 2235/96C04B 2235/9692
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Claims

Abstract

The invention relates to silicon nitride substances containing sintering additives and SiO 2 , a method for producing them and the use of the same.

Claims

exact text as granted — not AI-modified
1 . Silicon nitride materials containing sintering aids and SiO 2 , characterized in that the molar ratio of the silicon dioxide in the grain boundary phase to the sintering additives including SiO 2  in the grain boundary phase is >60% and the oxide nitride content <1%.  
     
     
         2 . Process for producing silicon nitride materials according to  claim 1 , characterized in that, either alone or in combination, 
 a) the Si 3 N 4  powder used, either alone or together with the sintering aids, is thermally oxidized,    b) the Si 3 N 4  powder, either alone or together with the sintering aids and, if desired, further additives, is tribooxidized during milling and/or    c) the Si 3 N 4  powder is admixed with sintering aids or with SiO 2  or at least one SiO 2 -forming component either before or during milling.    
     
     
         3 . Use of the silicon nitride materials according to  claim 1  in the construction of machinery and apparatus, in particular in bearings.

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