公开(公告)号：AU649114B2

公开(公告)日：1994-05-12

申请号：AU1300492

申请日：1992-03-18

Applicant: HOECHST AG

Inventor： HETTICH BERNHARD ,  MAJEWSKI PETER ,  SCHULZE KLAUS ,  PETZOW GUNTER

IPC: C01G1/00 ,  C01G29/00 ,  C04B35/00 ,  C04B35/45 ,  H01B12/00 ,  H01B13/00 ,  H01L39/12 ,  H01L39/24 ,  C04B35/64

Abstract: The invention relates to an oxide-ceramic superconducting material which contains bismuth, strontium, calcium and copper, having an overall composition of BiyCa2Sr2Cu3Ox, where y is an integer from 2.35 to 2.6 and x is about 10 to 12. The material has a critical temperature T above 105 K and has a proportion of the phase Bi2Sr2Ca2Cu3Ox of at least 85% by volume. The invention also relates to a process for producing a bismuth-containing superconducting material which comprises holding the oxides or oxide precursors of bismuth, strontium, calcium and copper at a temperature in the range from 850 DEG to 890 DEG C. over a time span of a plurality of hours and adhering to the following atomic ratios: Bi:Cu>2:3 Ca:Sr=0.9 to 1.50 SIGMA (Sr+Ca):Cu=4.2:3 to 4:3.33 Bi: SIGMA (Sr+Ca)=2.35:4 to 3.1:4

公开(公告)号：AU1300492A

公开(公告)日：1992-09-24

申请号：AU1300492

申请日：1992-03-18

Applicant: HOECHST AG

Inventor： HETTICH BERNHARD ,  MAJEWSKI PETER ,  SCHULZE KLAUS ,  PETZOW GUNTER

IPC: C01G1/00 ,  C01G29/00 ,  C04B35/00 ,  C04B35/45 ,  H01B12/00 ,  H01B13/00 ,  H01L39/12 ,  H01L39/24 ,  C04B35/64

Abstract: The invention relates to an oxide-ceramic superconducting material which contains bismuth, strontium, calcium and copper, having an overall composition of BiyCa2Sr2Cu3Ox, where y is an integer from 2.35 to 2.6 and x is about 10 to 12. The material has a critical temperature T above 105 K and has a proportion of the phase Bi2Sr2Ca2Cu3Ox of at least 85% by volume. The invention also relates to a process for producing a bismuth-containing superconducting material which comprises holding the oxides or oxide precursors of bismuth, strontium, calcium and copper at a temperature in the range from 850 DEG to 890 DEG C. over a time span of a plurality of hours and adhering to the following atomic ratios: Bi:Cu>2:3 Ca:Sr=0.9 to 1.50 SIGMA (Sr+Ca):Cu=4.2:3 to 4:3.33 Bi: SIGMA (Sr+Ca)=2.35:4 to 3.1:4

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.