US 7,008,576 B2 · Microporous ceramic materials and the producing method of the same

Abstract

Microporous ceramic materials used in structural materials, high-temperature filters, electrode materials or preform materials for infiltration by homogeneously mixing and molding a ceramic precursor powder polymer. The powder is saturated by introducing fluid to a pressure vessel. The fluid is super saturated by adjusting pressure in the vessel. Micropores are formed in the molded bodies by evolving the fluid from the molded bodies by heating and hardening the molded bodies. The hardened molded bodies are heated to pyrolysis. Pore characteristics (e.g., pore size and pore size distribution) suitable to target materials are controlled by adjusting pressure at a non-critical state without requiring additional processes or devices.

Claims12

Dependent claims

A method of producing microporous ceramic materials, which comprises the steps of:

producing molded bodies by homogeneously mixing a starting material of polymer ceramic precursor powder and ceramic powder, and then molding the same;
saturating the molded bodies in a pressure vessel by introducing CO2 of 20–400 atm. at a temperature below its critical temperature;
super-saturating the CO2 saturated to said molded bodies by adjusting pressure in said pressure vessel;
forming micropores in said molded bodies by evolving said CO2 of super-saturated state from said molded bodies by heating the same at a temperature between the softening temperature and the melting temperature of said polymer ceramic precursor;
hardening said molded bodies having micropores;
and carrying out pyrolysis by heating said hardened molded bodies.

3 more elements

Dependencies are inferred from the claim text.

Microporous ceramic materials and the producing method of the same

Life of this patent

Microporous ceramic materials and the producing method of the same

Life of this patent

Abstract

Claims12