Global Patent Index - EP 1070029 A1

EP 1070029 A1 2001-01-24 - CHEMICAL CONTROL OVER CERAMIC POROSITY USING CARBOXYLATE-ALUMOXANES

Title (en)

CHEMICAL CONTROL OVER CERAMIC POROSITY USING CARBOXYLATE-ALUMOXANES

Title (de)

CHEMISCHE REGLUNG VON CERAMISCHER POROSITÄT UNTER VERWENDUNG VON CARBOXYLATEN-ALUMOXANEN

Title (fr)

CONTROLE CHIMIQUE DE LA POROSITE D'UNE CERAMIQUE AU MOYEN DE CARBOXYLATE-ALUMOXANES

Publication

EP 1070029 A1 (EN)

Application

EP 99914011 A

Priority

  • US 9906137 W
  • US 7992698 P

Abstract (en)

[origin: WO9950203A1] This invention relates generally to a method for controlling the pore size, pore size distribution and porosity of aluminum-oxide based ceramics through the choice of substituents on carboxylate-alumoxanes and aluminum-oxide nanoparticles. The method allows for the formation of intra-granular pores in the nanometer range to be created in alumina and aluminum oxide ceramic bodies. The control over pore size and pore size distribution is accomplished through the use of different chemical substituents on the carboxylate-alumoxanes and aluminum-oxide nanoparticles. The size and distribution of pores within the alumina-oxide ceramic are dependent on the identity of the carboxylate substituents. In particular the formation of intra-versus inter-granular porosity is dependent on the identity of the carboxylate substituents. The invention also provides methods for the manufacture of ceramic coatings on ceramic and carbon fibers for composite applications and ceramic membranes with nanometer sized pores. The pore size, pore size distribution and porosity, and hence the strength, permeability and surface adhesion, of the ceramic coating is controlled by the choice of substituent on the carboxylate-alumoxane. Thermolysis of self supporting spun layers of the carboxylate-alumoxanes results in disks of alumina with controlled pore size, pore size distribution and porosity. In an alternative method a porous substrate is dipped or coated with a solution of the carboxylate-alumoxane, followed by thermolysis to produce a composite membrane.

IPC 1-7 (main, further and additional classification)

C04B 38/00; C04B 41/50

IPC 8 full level (invention and additional information)

B01D 67/00 (2006.01); B01D 71/02 (2006.01); C01F 7/02 (2006.01); C01F 7/30 (2006.01); C03C 23/00 (2006.01); C04B 38/00 (2006.01); C04B 41/45 (2006.01); C04B 41/81 (2006.01)

CPC (invention and additional information)

B01D 67/0039 (2013.01); B01D 67/0041 (2013.01); B01D 69/10 (2013.01); B01D 71/025 (2013.01); B82Y 30/00 (2013.01); C01F 7/02 (2013.01); C01F 7/30 (2013.01); C03C 23/0095 (2013.01); C04B 35/111 (2013.01); C04B 35/62849 (2013.01); C04B 38/0022 (2013.01); C04B 41/009 (2013.01); C04B 41/4582 (2013.01); C04B 41/4584 (2013.01); C04B 41/81 (2013.01); B01D 2323/18 (2013.01); C01P 2004/04 (2013.01); C01P 2004/51 (2013.01); C01P 2004/64 (2013.01); C04B 2111/00793 (2013.01); C04B 2111/00801 (2013.01); C04B 2235/3218 (2013.01); C04B 2235/5224 (2013.01); C04B 2235/5244 (2013.01); C04B 2235/5248 (2013.01)

Combination set (CPC)

  1. C04B 38/0022 + C04B 35/10 + C04B 38/0045
  2. C04B 41/4582 + C04B 41/4554 + C04B 41/4584 + C04B 41/5031
  3. C04B 41/009 + C04B 14/386
  4. C04B 41/009 + C04B 14/46
  5. C04B 41/009 + C04B 38/0022
  6. C04B 41/009 + C04B 16/0691

Citation (search report)

See references of WO 9950203A1

Designated contracting state (EPC)

DE FR GB IT NL

EPO simple patent family

WO 9950203 A1 19991007; AU 3195899 A 19991018; CA 2327097 A1 19991007; EP 1070029 A1 20010124

INPADOC legal status


2004-05-12 [18R] REFUSED

- Effective date: 20031222

2001-03-14 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010126

2001-01-24 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000908

2001-01-24 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB IT NL