公开(公告)号：DE3866677D1

公开(公告)日：1992-01-16

申请号：DE3866677

申请日：1988-10-08

Applicant: DEGUSSA

Inventor： KRIECHBAUM GANGOLF DR ,  KLEINSCHMIT PETER DR ,  PEUCKERT DORIS DR

IPC: C04B35/48 ,  C01G25/00 ,  C01G25/02 ,  C04B35/486

Abstract: A novel crystalline zirconium oxide powder has a BET specific surface of less than 30 (pref. 10-20) sq.m./g., a primary particle size of 0.1-0.5 microns, a monoclinic crystal structure and opt. a content of 1-10 wt. % Y2O3 and/or 1-10 wt. % MqO. Prodn. of the powder involves addinq an aq. Zr salt soln., opt. contg. Y and/or Mq ions, with stirrinq to an aq. base soln., e.q. caustic soda with an NaOH excess correspondinq to 0.5 mol/lNaOH, hydrothermally treating the reaction mixt. at 200-400 deg. C, filtering off the resulting product, water washinq free of chloride and drying at 10O-120 deg. C.

公开(公告)号：DE3737064A1

公开(公告)日：1989-05-11

申请号：DE3737064

申请日：1987-10-31

Applicant: DEGUSSA

Inventor： KRIECHBAUM GANGOLF DR ,  KLEINSCHMIT PETER DR ,  PEUCKERT DORIS DR

IPC: C04B35/48 ,  C01G25/00 ,  C01G25/02 ,  C04B35/486

Abstract: A crystalline zirconium oxide powder having a BET surface area of /g, preferably 10 to 20 m /g, and a primary particle size of 0.1 to 0.5 mu m and a monoclinic crystal structure and, if desired, a Y2O3 content of 1 to 10% by weight and/or an MgO content of 1 to 10% by weight is prepared by adding an aqueous zirconium salt solution containing, if desired, yttrium ions and/or magnesium ions with stirring into a previously introduced aqueous base solution, such as, for example, sodium hydroxide solution, having an NaOH content corresponding to an excess of at least 0.5 mol / 1 NaOH, and subjecting the reaction mixture thus obtained to a hydrothermal treatment at a temperature of 200 to 400 DEG C, filtering off the product obtained, washing it free of chloride with water and drying it at 100 to 120 DEG C. … The zirconium oxide powder can be used for the production of sintered ceramics.