Process for preparing metal-carbide-containing microspheres from metal-loaded resin beads
AssigneeThe United States of America as represented by the United States Energy Research and Development
InventorRonald L. Beatty
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Abstract
An improved method for treating metal-loaded resin microspheres is described which comprises heating a metal-loaded resin charge in an inert atmosphere at a pre-carbide-forming temperature under such conditions as to produce a microsphere composition having sufficient carbon as to create a substantially continuous carbon matrix and a metal-carbide or an oxide-carbide mixture as a dispersed phase(s) during carbide-forming conditions, and then heating the thus treated charge to a carbide-forming temperature.
Claims4
In a method of converting a metal contained in a charge of weak-acid resin microspheres into its corresponding carbide, the improvement which comprises heating said metalloaded resin charge in an inert atmosphere at a temperature in the range 200.degree.-500.degree.C at a rate which results in carbonizing the resin to create a metal-loaded carbonized microsphere within a carbon matrix, said carbonized microsphere having a carbon to metal ratio of no less than about 6 and then heating the carbonized microspheres to a carbide-forming temperature in the range 1200.degree.-2000.degree.C to convert the metal within said matrix to its corresponding carbide.
The method according to claim 5 in which the resin microspheres are derived from copolymers of acrylic acid, or methacrylic acid and divinyl benzene.
The method according to claim 5 in which the resin microspheres are IRC-72 and are heated at a temperature in the range 200.degree.-500.degree.C. at a rate which does not exceed 2.degree.C./min. and then heated in a fluidized bed at a temperature in the range 1200.degree.-2000.degree.C. to convert the metal moiety into a corresponding metal carbide existing as a dispersed phase within a substantially continuous carbon matrix.
The method according to claim 5 in which the metal is selected from the group consisting of rare earth and actinide metals.
Dependencies are inferred from the claim text.