Global Patent Index - EP 1025062 A1

EP 1025062 A1 2000-08-09 - SILICON NITRIDE SUBSTANCES CONTAINING SINTERING ADDITIVES AND SiO 2?, METHOD FOR PRODUCING THEM AND USE OF THE SAME

Title (en)

SILICON NITRIDE SUBSTANCES CONTAINING SINTERING ADDITIVES AND SiO 2?, METHOD FOR PRODUCING THEM AND USE OF THE SAME

Title (de)

SINTERADDITIVE UND SILICIUMDIOXID-ENTHALTENDE SILICIUMNITRIDWERKSTOFFE, EIN VERFAHREN ZU DEREN HERSTELLUNG UND DEREN VERWENDUNG

Title (fr)

MATERIAUX DE NITRURE DE SILICIUM CONTENANT DES ADDITIFS DE FRITTAGE ET DU SiO 2?, PROCEDE PERMETTANT DE LES PRODUIRE ET LEUR UTILISATION

Publication

EP 1025062 A1 (DE)

Application

EP 98951501 A

Priority

  • DE 19746008 A
  • EP 9806375 W

Abstract (en)

[origin: DE19746008A1] A sintering additive- and SiO2-containing silicon nitride material has an extremely high grain boundary SiO2 content and a low oxynitride content. In a sintering additive- and SiO2-containing silicon nitride material, the molar ratio of the SiO2 in the grain boundary phase to the sintering additive including SiO2 in the grain boundary phase is greater than 60 % and the oxynitride content is less than 1 %. An Independent claim is also included for a process for producing the above silicon nitride material, in which (a) the Si3N4 powder is thermally oxidized alone or together with the sintering additive; (b) the Si3N4 powder is tribo-oxidized, alone or together with the sintering additive and optionally further additives, during grinding; and/or (c) the Si3N4 powder is reacted with a SiO2-forming component or SiO2 before or during grinding with the sintering additive.

IPC 1-7 (main, further and additional classification)

C04B 35/593; C04B 35/584; F16C 33/04

IPC 8 full level (invention and additional information)

C04B 35/584 (2006.01); C04B 35/593 (2006.01); F16C 33/04 (2006.01)

CPC (invention and additional information)

F16C 33/043 (2013.01); C04B 35/584 (2013.01); C04B 35/593 (2013.01); C04B 35/5935 (2013.01); C04B 35/6261 (2013.01); C04B 35/6265 (2013.01); C04B 35/62665 (2013.01); C04B 35/62685 (2013.01); C04B 35/62807 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/3225 (2013.01); C04B 2235/3232 (2013.01); C04B 2235/3244 (2013.01); C04B 2235/3256 (2013.01); C04B 2235/3258 (2013.01); C04B 2235/3418 (2013.01); C04B 2235/3826 (2013.01); C04B 2235/3856 (2013.01); C04B 2235/3865 (2013.01); C04B 2235/3869 (2013.01); C04B 2235/3886 (2013.01); C04B 2235/3891 (2013.01); C04B 2235/3895 (2013.01); C04B 2235/483 (2013.01); C04B 2235/5409 (2013.01); C04B 2235/5445 (2013.01); C04B 2235/6587 (2013.01); C04B 2235/77 (2013.01); C04B 2235/80 (2013.01); C04B 2235/85 (2013.01); C04B 2235/96 (2013.01); C04B 2235/9692 (2013.01)

Citation (search report)

See references of WO 9920579A1

Designated contracting state (EPC)

BE DE FR GB IT LU NL SE

EPO simple patent family

DE 19746008 A1 19990422; AU 9749198 A 19990510; EP 1025062 A1 20000809; US 2003134737 A1 20030717; US 2007060466 A1 20070315; US 7244686 B2 20070717; WO 9920579 A1 19990429

INPADOC legal status


2015-10-07 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20150504

2007-08-15 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: H.C. STARCK CERAMICS GMBH & CO. KG

2004-04-21 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20040303

2000-08-09 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000522

2000-08-09 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): BE DE FR GB IT LU NL SE