公开(公告)号：CA1336343C

公开(公告)日：1995-07-18

申请号：CA579354

申请日：1988-10-05

Applicant: HOECHST AG

Inventor： GERDAU THOMAS ,  KLEINER HANS-JERG ,  PEUCKERT MARCELLUS ,  BRUECK MARTIN ,  ALDINGER FRITZ

IPC: C04B35/00 ,  C04B35/58 ,  C04B35/589 ,  C08G77/48 ,  C08G77/62

Abstract: The invention relates to novel polymeric hydridosilazanes, processes for their preparation and their use for the preparation of ceramic material containing silicon nitride. To prepare the polymeric hydridosilazanes, polymeric hydridochlorosilazanes are reacted with NH3. To prepare the ceramic material containing silicon nitride, the polymeric hydridosilazanes are then pyrolysed.

公开(公告)号：CA2111166A1

公开(公告)日：1994-06-13

申请号：CA2111166

申请日：1993-12-10

Applicant: HOECHST AG

Inventor： MAJEWSKI PETER ,  PETZOW GUENTER ,  ALDINGER FRITZ ,  HETTICH BERNHARD ,  ELSCHNER STEFFEN

IPC: C01G1/00 ,  C01G29/00 ,  C04B35/00 ,  C04B35/45 ,  C04B41/80 ,  H01B12/00 ,  H01B13/00 ,  H01L39/24

Abstract: : Process for increasing the pinning force of superconducting Bi-Sr-Ca-Cu-O ceramic moldings Process for increasing the pinning force of superconducting Bi-Sr-Ca-Cu-O ceramic moldings, which comprises heating the pure-phase 2212 phase of a Bi-Sr-Ca-Cu-O ceramic molding under pure oxygen or an oxygencontaining gas for from 1 to 40 minutes to a temperature of from 825 to 900.degree.C and generating secondary-phase precipitates in the process.

公开(公告)号：GB2232115B

公开(公告)日：1993-04-28

申请号：GB9011780

申请日：1990-05-25

Applicant: HOECHST AG

Inventor： KRUENER HARTMOND ,  HAMMINGER RAINER ,  SELGERT PETER ,  ALDINGER FRITZ

IPC: B22F3/22 ,  B28B1/00 ,  B28B1/26 ,  B29B7/34 ,  B60C11/00 ,  C04B35/565 ,  C04B35/584 ,  C04B35/622

公开(公告)号：CA2004406A1

公开(公告)日：1990-06-03

申请号：CA2004406

申请日：1989-12-01

Applicant: HOECHST AG

Inventor： PEUCKERT MARCELLUS ,  BRUCK MARTIN ,  GERDAU THOMAS ,  VAAHS TILO ,  KLEINER HANS-JERG ,  ALDINGER FRITZ

IPC: C04B41/84 ,  C04B35/58 ,  C04B35/589 ,  C04B35/80 ,  C04B41/45 ,  C04B41/49 ,  C04B41/50 ,  C04B41/81 ,  C04B41/87 ,  B05D3/02 ,  B32B18/00 ,  B05D3/04 ,  C04B35/84

Abstract: HOE 88/F 347 Ceramic/fiber composite and process for its production The invention relates to a ceramic/fiber composite and a process for its production. The process comprises impregnating fibers with a molten polysilazane in a first step, converting the polysilazane in the fibers into the infusible state in a second step and, in a third step, heating the impregnated fibers to 800 to 2000.degree.C in an atmosphere of nitrogen, noble gas, or ammonia.

公开(公告)号：CA2004394A1

公开(公告)日：1990-06-03

申请号：CA2004394

申请日：1989-12-01

Applicant: HOECHST AG

Inventor： PEUCKERT MARCELLUS ,  BRUCK MARTIN ,  VAAHS TILO ,  KLEINER HANS-JERG ,  ALDINGER FRITZ

IPC: C04B35/58 ,  C04B35/589 ,  C04B35/593 ,  C04B41/50 ,  C04B41/84 ,  C04B41/87 ,  C04B35/14 ,  B32B18/00

Abstract: HOE 88/F 346K : High-strength ceramic composite, process for its preparation and its use The invention relates to a high-strength ceramic composite, in particular made from silicon nitride, a process for its preparation and its use. The process comprises impregnating an open-pore matrix with a molten polysilazane in a first step and, in a second step, heating the impregnated matrix to 800 to 2500.degree.C under a blanketing gas, such as nitrogen or a noble gas, or to 800 to 1500.degree.C under a gas containing ammonia. The high-strength ceramic composite prepared can be used as a component to be subjected to high thermal, mechanical or corrosive stress.

公开(公告)号：CA1331624C

公开(公告)日：1994-08-23

申请号：CA582223

申请日：1988-11-04

Applicant: HOECHST AG

Inventor： VAAHS TILO ,  KLEINER HANS-JERG ,  PEUCKERT MARCELLUS ,  BRUECK MARTIN ,  ALDINGER FRITZ

IPC: C04B35/58 ,  C04B35/589 ,  C08G77/62 ,  C07F7/10

Abstract: of the disclosure The invention relates to novel polysilazanes, the preparation thereof, the further processing thereof to form silicon nitride-containing ceramic material, and this material itself. In order to prepare the polysilazanes, dialkylaminoorganyldichlorosilanes of the formula RSiCl2-NR'R' are reacted wtih ammonia. The polysilazanes can then be pyrolyzed to form silicon nitride-containing ceramic material. The polysilazanes according to the invention dissolve in customary aprotic solvents.

公开(公告)号：CA1313722C

公开(公告)日：1993-02-16

申请号：CA579344

申请日：1988-10-05

Applicant: HOECHST AG

Inventor： GERDAU THOMAS ,  KLEINER HANS-JERG ,  PEUCKERT MARCELLUS ,  BRUECK MARTIN ,  ALDINGER FRITZ

IPC: C04B35/589 ,  C07F7/10 ,  C08G77/48 ,  C08G77/62

Abstract: of the disclosure: HOE 87/F 302 Polymeric hydridochlorosilazanes and processes for their preparation The invention relates to novel polymeric hydridochlorosilLazanes and a process for their preparation. The compounds according to the invention can be converted into polyhydridosilazanes by reaction with ammonia, and these can in turn be pyrolyzed to ceramic material containing silicon nitride. To prepare the polymeric hydridochlorosilazanes, oligohydridoalkylsilazanes (R1SiHNH)n are reacted with a dichlorohydridoalkylsilane R2SiHCl2.

公开(公告)号：GB2232115A

公开(公告)日：1990-12-05

申请号：GB9011780

申请日：1990-05-25

Applicant: HOECHST AG

Inventor： KRUENER HARTMOND ,  HAMMINGER RAINER ,  SELGERT PETER ,  ALDINGER FRITZ

IPC: B22F3/22 ,  B28B1/00 ,  B28B1/26 ,  B29B7/34 ,  B60C11/00 ,  C04B35/565 ,  C04B35/584 ,  C04B35/622

公开(公告)号：CA2004403A1

公开(公告)日：1990-06-03

申请号：CA2004403

申请日：1989-12-01

Applicant: HOECHST AG

Inventor： PETZOW GUNTER ,  RIEDEL RALF ,  SEHER MARTIN ,  PEUCKERT MARCELLUS ,  BRUCK MARTIN ,  GERDAU THOMAS ,  KLEINER HANS-JERG ,  VAAHS TILO ,  ALDINGER FRITZ

IPC: C01B21/068 ,  C04B35/58 ,  C04B35/589 ,  C04B35/593 ,  C08G77/48 ,  C08G77/62 ,  C04B35/14 ,  C04B35/56

Abstract: HOE 88/F 349 Sinterable ceramic powder, process for its preparation, silicon nitride ceramic manufactured thereform, process for its manufacture and its use The invention relates to a novel sinterable ceramic powder, to its preparation, to its processing to form silicon nitride ceramic and to said material itself and its use. The sinterable ceramic powder is prepared by dissolving the polysilazane of formula (I) ¢CH3SiHNH!n¢CH3SiN!n where n is about 10 to 12, in an organic solvent, suspending a pulverulent sinter aid in this solution and then evaporating the solvent and pyrolyzing the residue in an inert gas atmosphere at 500 to 1600.degree.C. The resulting ceramic powder can be used to form a shaped article and then to manufacture silicon nitride ceramic by sintering. It is also possible, however, to form a shaped article from the as yet unpyrolyzed residue obtained after evaporation of the solvent, and then to pyrolyze and sinter said article. The ceramic obtained can be used to manufacture components subject to high mechanical, thermal and corrosive stress.