Back to results
US 4,512,821 AGranted
Method for metal treatment using a fluidized bed
AssigneeProcedyne Corp.
InventorsRobert Staffin, Carol A. Girrell, Mario A. Fronzoni
Life of this patent
Estimating the term…
Abstract
The present invention involves an apparatus and method for heat treating metal workpieces in chemically controlled environments produced by decomposition of an atmosphere precursor, e.g. methanol or ethyl acetate, introduced to a heated fluidized bed retort as a vapor.
Claims15
A method of producing chemically controlled atmospheres for treating metal workpieces in fluidized beds, which comprises:
- providing a precursor liquid that upon decomposition establishes a desired atmosphere in a fluidized bed;
- vaporizing the precursor liquid externally of the fluidized bed;
- introducing the vaporized precursor liquid into a plenum associated with the fluidized bed;
- maintaining the vaporized precursor liquid within the plenum at temperatures between its vaporization and decomposition temperatures;
- introducing the vaporized precursor liquid to the fluidized bed wherein it thermally decomposes into selected chemical entities that provide at least a portion of the desired atmosphere.
2 more elements
A method of producing chemically controlled atmospheres for treating metal workpieces in fluidized beds, which comprises:
- providing methanol which is normally in liquid form;
- vaporizing the methanol externally of the fluidized bed;
- maintaining the methanol between its vaporization and decomposition temperatures;
- providing a fluidized bed and means for heating the fluidized bed;
- introducing the vaporized methanol to the fluidized bed at a temperature between its vaporization and decomposition temperatures;
- causing the vaporized methanol to thermally decompose in the fluidized bed into selected chemical fractions that provide at least a portion of the selected atmosphere.
3 more elements
Dependencies are inferred from the claim text.