Method for making max phase composites
AssigneeUchicago Argonne, LLC
InventorsDileep Singh, Beihai Ma
Life of this patent
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Abstract
A method of forming a MAX Phase composite can include forming a precursor powder into a discrete shape to thereby form a green body; heating the green body at a pre-sintering temperature to partially reduce the oxide present in the green body to thereby form a pre-sintered preform; and performing reactive infiltration by heating the pre-sintered preform in the presence of an infiltrating material comprising an A-group element to an infiltration temperature suitable for transforming the infiltrating material to a molten state, wherein the molten infiltrating material reacts with the pre-sintered preform to thereby form the MAX Phase composite.
Claims20
A method for preparing a M-A-X containing MAX Phase composite, wherein M comprises one or more Group 3-7 transition metals, A is an A-group element, and X is C or N, the method comprising:
- heating a precursor powder comprising a carbon source, an oxide of M, and one or both of a carbide and nitride of M to a pre-sintering temperature for pre-sintering the precursor powder to thereby form a pre-sintered precursor powder;
- admixing the pre-sintered precursor powder with a powder comprising the A-group element;
- forming the admixture into a discrete shape to thereby from a green body;
- heating the green body at a co-sintering temperature for melt infiltration of the A-group element to thereby form a co-sintered preform;
- and
- performing reactive infiltration by heating the co-sintered preform to an infiltration temperature suitable for transforming an infiltrating material comprising the A-group element provided in the presence of the co-sintered preform and/or unreacted A-group element present in the co-sintered preform to a molten state, wherein the molten infiltrating material and/or unreacted A-group element reacts with the co-sintered preform to thereby form the MAX Phase composite,
- wherein:
- heating the precursor at the pre-sintering temperature partially reduces the oxide of M present in the precursor powder to an oxide of M capable of being wetted by the infiltrating materials, and
- the MAX Phase composite comprises an oxide of A and at least one MAX Phase compound having formula Mn+1AXn, wherein n is 1-4.
A method for preparing a M-A-X containing MAX Phase composite, wherein M comprises one or more Group 3-7 transition metals, A is an A-group element, and X is C or N, the method comprising:
- forming a precursor powder into a discrete shape to thereby form a green body, wherein the precursor powder comprises a carbon source, an oxide of M, and one or both of a carbide and nitride of M;
- heating the green body at a pre-sintering temperature to partially reduce the oxide of M present in the green body to thereby form a pre-sintered preform;
- and
- performing reactive infiltration by heating the pre-sintered preform in the presence of an infiltrating material comprising the A-group element to an infiltration temperature suitable for transforming the infiltrating material to a molten state, wherein the molten infiltrating material reacts with the pre-sintered preform to thereby form the MAX Phase composite,
- wherein:
- heating the green body at the pre-sintering temperature partially reduces the oxide of M present in the green body to an oxide of M capable of being wetted by the infiltrating materials, and
- the MAX Phase composite comprises an oxide of A and at least one MAX Phase compound having formula Mn+1AXn, wherein n is 1-4.
A method for preparing a M-A-X containing MAX Phase composite, wherein M comprises one or more Group 3-7 transition metals, A is an A-group element, and X is C or N, the method comprising:
- forming a precursor powder into a first discrete shape to thereby form a green body, wherein the precursor powder comprises a carbon source, an oxide of M, and one or both of a carbide and nitride of M;
- heating the green body at a pre-sintering temperature to partially reduce the oxide of M present in the green body to thereby form a pre-sintered preform;
- crushing the pre-sintered preform into a pre-sintered preform powder;
- admixing the pre-sintered preform powder with an infiltrating material powder and forming the admixture into a second discrete shape, wherein the infiltrating material powder comprises the A-group element;
- and
- performing reactive infiltration by heating the second discrete shape to an infiltration temperature suitable for transforming the infiltrating material to a molten state, wherein the molten infiltrating material reacts with the pre-sintered preform powder in the second discrete shape to thereby form the MAX Phase composite,
- wherein:
- heating the green body at the pre-sintering temperature partially reduces the oxide of M present in the green body to an oxide of M capable of being wetted by the infiltrating material,
- the pre-sintered preform powder comprises oxide of M capable of being wetted by the infiltrating material, and one or both of the carbide and nitride of M, and
- the MAX Phase composite comprises an oxide of A and a MAX Phase compound having the formula Mn+1AXn, wherein n is 1-4.
Dependencies are inferred from the claim text.