Production of carbides and nitrides
AssigneeCsir
InventorsDavid Lewis Morgan, Vladimir Cukan
Life of this patent
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Abstract
A method of making a compound selected from metal and silicon carbides and nitrides includes the steps of providing a solution of a coal-derived material in a solvent, the coal-derived material having a composition, free of solvent, of 70 to 91 percent by mass of carbon, 2 to 6 percent by mass of hydrogen and 3 to 20 percent by mass of oxygen, and a source of an oxide of silicon or the metal, causing the coal-derived material in solution and the source of the oxide to interact, removing the solvent to form a precursor and heat treating the precursor to produce the compound.
Claims6
A method of preparing a compound selected from the group consisting of silicon carbide and silicon nitride comprising the steps of providing a solution of a coal-derived material in a dipolar, aprotic solvent, the coal-derived material having a composition, free of solvent, of 70 to 91% by mass of carbon, 2 to 6% by mass of hydrogen and 3 to 20% by mass of oxygen, and silicon oxide in particulate form, causing the coal-derived material, in solution or as a precipitate, and the silicon oxide in particulate form to interact, removing the solvent to form a precursor and heat treating the precursor to produce the compound.
A method of making a compound selected from the group consisting of silicon carbide and silicon nitride comprising the steps of providing a solution of a coal-derived material in a dipolar, aprotic solvent, the coal-derived material having a composition, free of solvent, of 70 to 91 percent by mass of carbon, 2 to 6 percent by mass of hydrogen and 3 to 20 percent by mass of oxygen, and a source of silicon oxide in solution, adding the source of silicon oxide solution to the coal-derived material solution to cause a co-precipitate of the coal-derived material and a silicon oxide precursor to form, removing the solvent to form a precursor of the compound and heat treating the precursor of the compound to produce the compound.
Dependencies are inferred from the claim text.