Title:
PRODUCTION OF POWDERY STARTING MATERIAL FOR YTTRIUM ALUMINUM GARNET
Document Type and Number:
Japanese Patent JP3801275
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain powdery starting material for yttrium aluminum garnet having satisfactory dispersibility and giving a transparent sintered compact by adding an org. hydroxy acid to aq. soln. of mineral acid salts of Y and Al mixed in such a ratio as to give a garnet compsn., neutralizing the soln. with urea and calcining the resultant precipitate.
SOLUTION: An org. hydroxy acid, one of precursor is added to an aq. soln. of mineral acid salts of Y and Al mixed in such a ratio as to give a garnet compsn., the soln. is neutralized with urea and the resultant precipitate is calcined to produce the objective powdery starting material for yttrium aluminum garnet(YAG) having satisfactory dispersibility and high sinterability and giving a transparent sintered compact. Since sulfuric acid is not used, environmental problem due to gaseous SO2 is not caused at the time of firing. Lactic acid or tartaric acid may be used as the org. hydroxy acid and this acid is added by an amt. (mol) 0.1-5 times the total cocn. of Y and Al ions.
Inventors:
Takako Yanagiya
Hideki Yagi
Imagawa Moriki
Hideki Yagi
Imagawa Moriki
Application Number:
JP27416696A
Publication Date:
July 26, 2006
Filing Date:
September 24, 1996
Export Citation:
Assignee:
Kamijima Chemical Co., Ltd.
International Classes:
C01F17/00; C04B35/44; H01S3/16; (IPC1-7): C01F17/00; C04B35/44; //H01S3/16
Attorney, Agent or Firm:
Akira Shioiri
Mika with salt
Mika with salt