公开(公告)号：DE4013306A1

公开(公告)日：1991-10-31

申请号：DE4013306

申请日：1990-04-26

Applicant: HOECHST AG

Inventor： BRUECK MARTIN ,  VAAHS TILO DR ,  PEUCKERT MARCELLUS DR ,  SCHEUNEMANN UDE DR ,  STEHLIN THOMAS DR ,  THEIS JUERGEN DR

IPC: C04B35/589 ,  C03C13/04 ,  C04B35/584 ,  C04B41/50 ,  C04B41/87 ,  D01F9/10 ,  D06M11/00 ,  D06M11/60 ,  D06M101/00 ,  G02B1/00

Abstract: Method of making optical materials from silicon nitride by pyrolysis of polymeric silazanes by pressing, before the pyrolysis, the pulverulent polymeric silazanes to give mouldings or first dissolving the polymeric silazanes in an organic solvent, drawing fibres from this solution and pyrolysing said fibres after evaporation of the solvent or by melting of polymeric silazanes, casting, injection-moulding or extruding this melt to give mouldings and subsequent pyrolysis. During or after the pyrolysis, an oxidic layer is produced in an oxygen-containing atmosphere on the silicon nitride moulding. The pyrolysis can be carried out at 800-1000 DEG C in an atmosphere containing ammonia or containing ammonia/inert gas mixtures.

公开(公告)号：DE3840774A1

公开(公告)日：1990-06-07

申请号：DE3840774

申请日：1988-12-03

Applicant: HOECHST AG

Inventor： VAAHS TILO DR ,  GERDAU THOMAS DR ,  KLEINER HANSS-JERG DR ,  PEUCKERT MARCELLUS DR ,  BRUECK MARTIN

IPC: C04B35/58 ,  C04B35/589 ,  C08G77/48 ,  C08G77/62 ,  D01F9/10

公开(公告)号：DE3839745A1

公开(公告)日：1990-03-08

申请号：DE3839745

申请日：1988-11-25

Applicant: HOECHST AG

Inventor： MORACH EUGEN DIPL ING ,  PEUCKERT MARCELLUS DR ,  SCHMIDT GUENTER DR ,  SCHOELCH HANS-PETER DR

IPC: C01G3/00 ,  C01G1/00 ,  C01G15/00 ,  C01G29/00 ,  C23C4/10 ,  C23C14/08 ,  C23C14/34 ,  H01B13/00 ,  H01L21/31 ,  H01L39/24

公开(公告)号：DE3743826A1

公开(公告)日：1989-07-06

申请号：DE3743826

申请日：1987-12-23

Applicant: HOECHST AG

Inventor： VAAHS TILO DR ,  KLEINER HANS-JERG DR ,  PEUCKERT MARCELLUS DR ,  BRUECK MARTIN DIPL ING

IPC: C04B35/58 ,  C04B35/589 ,  C08G77/48 ,  C08G77/60 ,  C08G77/62 ,  D01F9/10

Abstract: The polymeric hydridothiosilazanes are prepared by reacting oligohydridoalkylsilazanes (RSiHNH)n with elemental sulphur in an ether as solvent. The polymeric hydridothiosilazanes can then be pyrolysed to give silicon-nitride-containing ceramic material.