Title:
セラミック発泡体を製造する方法
Document Type and Number:
Japanese Patent JP4503831
Kind Code:
B2
Abstract:
A process for foaming ceramic foams, in which the ceramic foams are produced from a precursor or a mixture of precursors which contain at least one ceramic-forming element and liberates at least one volatile reaction product during an inorganic gelation process. In one embodiment, foaming is based on a precursor containing crystals of the AlCl3(Pri2O) complex. The decomposition of the initial precursor produces polymerizing species dissolved in liquid isopropyl chloride. The solvent and growing AlOxCly(OPri)z species are mixed homogeneously so that the boiling point of the solution is raised above the boiling point of the pure isopropyl chloride. Polymerization takes place in the liquid until a critical polymer size is attained, whereupon a phase separation into polymer rich and solvent rich regions occurs. Since the expelled solvent is suddenly above its boiling point, bubbles start forming instantly. Foam stabilization takes place as a result of gelation in the polymer rich regions which comprise the cell walls in the foam. The net result of the process is a gelled ultra light foam.
Inventors:
Grader, Gideon
Sitter, Jenadi
Dehazan, Yorum
Sitter, Jenadi
Dehazan, Yorum
Application Number:
JP2000542265A
Publication Date:
July 14, 2010
Filing Date:
March 17, 1999
Export Citation:
Assignee:
Ceraris Limited
International Classes:
C04B38/02; C04B35/10; C04B38/00
Domestic Patent References:
| JP8018825B2 | ||||
| JP2617362B2 |
Other References:
HASHISHIN T, JOYAMA A, KANEKO Y,Effect of Aluminum Lactate Powder in the Production of Mullite Porous Bodies.,日本セラミックス協会学術論文誌,1998年 2月,Vol.106 No.2,P.127-130
GRADER G S, DE HAZAN Y, BRAVO-ZHIVOTOVSKII D, SHTER G E,Effect of Aging on Nonhydrolytic Alumina Xerogels.,J Sol-Gel Sci Technol,1997年10月,Vol.10 No.2 ,P.127-137
GRADER G S, DE HAZAN Y, COHEN Y, BRAVO-ZHIVOTOVSKII D,Microstructure Evolution of Nonhydrolytic Alumina Gels.,J Sol-Gel Sci Technol,1997年 6月,Vol.10 No.1,P.5-12
KIM J H, CHOI G J, LEE J K, SIM S J, KIM Y D, CHO Y S,A novel precursor for the sol-gel and CVD methods to prepare alumina permselective membranes.,J Mater Sci,1998年 3月 1日, Vol.33 No.5 ,P.1253-1262
GRADER G S, DE HAZAN Y, SHTER G E,Ultra light ceramic foams.,Sol-Gel Synth Process ,2000年 1月17日,P.161-172
GRADER G S, DE HAZAN Y, BRAVO-ZHIVOTOVSKII D, SHTER G E,Effect of Aging on Nonhydrolytic Alumina Xerogels.,J Sol-Gel Sci Technol,1997年10月,Vol.10 No.2 ,P.127-137
GRADER G S, DE HAZAN Y, COHEN Y, BRAVO-ZHIVOTOVSKII D,Microstructure Evolution of Nonhydrolytic Alumina Gels.,J Sol-Gel Sci Technol,1997年 6月,Vol.10 No.1,P.5-12
KIM J H, CHOI G J, LEE J K, SIM S J, KIM Y D, CHO Y S,A novel precursor for the sol-gel and CVD methods to prepare alumina permselective membranes.,J Mater Sci,1998年 3月 1日, Vol.33 No.5 ,P.1253-1262
GRADER G S, DE HAZAN Y, SHTER G E,Ultra light ceramic foams.,Sol-Gel Synth Process ,2000年 1月17日,P.161-172
Attorney, Agent or Firm:
Shinjiro Ono
Kazuo Shamoto
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Takamasa Soma
Kazuo Shamoto
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Takamasa Soma