公开(公告)号：JP2002179412A

公开(公告)日：2002-06-26

申请号：JP2000379336

申请日：2000-12-13

Applicant: NAT INST FOR MATERIALS SCIENCE ,  NOF CORP

Inventor： SEKINE TOSHIMORI ,  YAJIMA YOSHIYUKI ,  TAKAHASHI KATSUHIKO ,  ITO KENJI

IPC: C01B21/068

Abstract: PROBLEM TO BE SOLVED: To provide a method of isolating and refining cubic spinel-type silicon nitride, by which unreacted low pressure phase silicon nitride contained in the cubic spinel-type silicon nitride as an impurity can be separated and the purity of the cubic spinel-type silicon nitride can be heightened. SOLUTION: The isolation and refining of the cubic spinel-type silicon nitride comprises accommodating a mixed power 12 comprising the cubic spinel-type silicon nitride and the low pressure phase silicon nitride and a mixed acid solution 13 comprising hydrofluoric acid and nitric acid or sulfuric acid in a reaction vessel 1 and reacting them while heating. Thereby, the low pressure phase silicon nitride reacts with the hydrofluoric acid and the unreacted low pressure phase silicon nitride in the cubic spinel-type silicon nitride is isolated and the cubic spinel-type silicon nitride is refined. The temperature at which the mixed acid solution is allowed to act is preferably 110 to 160 deg.C. It is preferable that both of the cubic spinel-type silicon nitride and the low pressure phase silicon nitride are powders and the particle diameters of each powder are

公开(公告)号：JP2002265205A

公开(公告)日：2002-09-18

申请号：JP2001067640

申请日：2001-03-09

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： SEKINE TOSHIMORI ,  YAJIMA YOSHIYUKI

IPC: C01B21/082

Abstract: PROBLEM TO BE SOLVED: To provide a method for efficiently separating and purifying an amorphous substance coexisting with a cubic spinel type sialon. SOLUTION: In a method for separating and purifying mixed powder of the high-pressure phase spinel type sialon and the amorphous substance manufactured by treating β-sialon (chemical formula, Si6-Z AlZ N8-Z , 0