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US 7,022,274 B2Granted
Gas sintered carbon block and method
AssigneeGraver Technologies LLC
InventorsS. Dyer Harris, Joel T. Shertok, John K. LeSieur
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Abstract
The present invention relates to an effective and rapid method and apparatus for sintering carbon filter blocks having a polymeric binder. The method employs direct contact heat transfer by gas molecule to powder particle, as opposed to conduction heat transfer from an external heating source, using commercially available sintered porous metal sheets and cylinders to form the mold and confine the powder, while allowing heated gas to pass uniformly through the mixture.
Claims10
A method for producing a sintered carbon block by direct heat transfer, the method comprising:
- a) selecting a mixture comprising least one polymer and carbon particles;
- b) providing a mold defined by interior and exterior walls, wherein at least one interior wall and at least one exterior wall is permeable to a heated gas;
- c) introducing said mixture into said mold between said interior and exterior walls;
- b) providing a gas;
- c) heating said gas to an elevated temperature, said temperature being determined by the composition of the polymer and carbon mixture whereby the polymer softens without melting;
- d) introducing said heated gas into the mold;
- e) passing said heated gas through said mixture between said interior and exterior walls;
- and
- d) heating said mixture by direct heat transfer at said temperature for a predetermined time period sufficient to allow said mixture to sinter,
- whereby a sintered carbon block is formed.
7 more elements
Dependencies are inferred from the claim text.