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AssigneeMartin Marietta Corporation
InventorsLeontios Christodoulou, Dennis C. Nagle, John M. Brupbacher
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A method is taught for the introduction of in-situ precipitated second phase materials, such as ceramic or intermetallic particles in a metal matrix, to a host metal. When an initial solvent-assisted reaction is utilized, metal-second phase composites having highly superior properties may be obtained. The invention may utilize the reaction of the second phase-forming constituents in a solvent metal medium to provide an intermediate material of finely-dispersed second phase particles in an intermediate metal matrix, in the form of a porous mass or sponge. Any desired loading of second phase in the final composite may be achieved by the admixture of this preformed intermediate material having a relatively high content of particulate material, with a molten host metal. Exemplary materials include titanium diboride in an aluminum matrix and titanium carbide in an aluminum matrix.
A method for the production of metal-second phase composite materials, the method comprising producing a precipitate of at least one second phase material in an intermediate metal matrix by contacting reactive second phase-forming constituents, in the presence of a substantially nonreactive solvent metal in which the second phase-forming constituents are more soluble than the second phase material, at a first temperature at which sufficient diffusion of the reactive second phase-forming constituents into the solvent metal occurs to cause the second phase-forming reaction of said constituents to thereby precipitate second phase particles in the solvent metal, producing an intermediate material comprising finely divided second phase particles in the intermediate metal matrix, and forming a molten mass, by introducing the intermediate material into a molten host metal in which said second phase particles are substantially insoluble at a second temperature at which said intermediate metal matrix is dissolved in said host metal, said host metal comprising a metal, metal alloy, or intermetallic, achieving a substantially uniform dispersion of second phase in a final metal matrix, and recovering a product.
A method for dispersion of second phase particles in a metallic matrix, the method comprising steps of:
A method for the production of metal-second phase composite materials, said method comprising precipitating at least one second phase material in a solvent metal by contacting reactive second phase-forming constituents, in the presence of a substantially nonreactive solvent metal in which the second phase-forming constituents are more soluble than the second phase, at a temperature at which sufficient diffusion of the constituents into the solvent metal occurs to cause reaction of the reactive second phase-forming constituents, thereby increasing the temperature to a temperature exceeding the melting temperature of the solvent metal and precipitating the second phase in the solvent metal;
A method for providing a second phase in a metallic matrix, the method comprising the steps of:
A method for dispersion of second phase dispersoids in a metallic matrix, the method comprising forming a reaction mixture of reactive second phase-forming constituents in the presence of at least two metals, at least one of which acts as a solvent metal in which the second phase-forming constituents are more soluble than the second phase dispersoids, raising the temperature of the reaction mixture to a temperature at which sufficient diffusion of the second phase-forming constituents into the lowest melting solvent metal occurs to initiate a reaction of the constituents, whereby the exothermic heat of reaction of the constituents causes the temperature of the reaction mixture to exceed the melting point of the highest melting metal, permitting dispersion of the second phase dispersoid in an alloy thereof;
A method for dispersion of second phase dispersoids in a metal matrix, the method comprising forming a reaction mixture of reactive second phase-forming constituents in the presence of at least two metals, at least one of which acts as a solvent metal in which second phase-forming constituents are more soluble than the second phase dispersoids, raising the temperature of the reaction mixture to a temperature at which sufficient diffusion of the second phase-forming constituents into the lowest melting solvent metal occurs to initiate a reaction of the constituents, whereby the exothermic heat of reaction of the constituents causes the temperature of the reaction mixture to exceed the melting point of the lowest melting point solvent metal, permitting dispersion of the second phase dispersoids in a mixed intermediate metal matrix, recovering an intermediate material, dissolving said intermediate metal matrix in a host metal in which said dispersoids are substantialy insoluble, and mixing, said host metal comprising metal, metal alloy, or intermetallic.
A method for dispersion of at least one intermetallic material in a metallic matrix, comprising steps of:
A method for dispersion of at least one ceramic material in a metallic matrix, comprising steps of:
A method for dispersing dispersoid particles of an intermetallic material and a ceramic material in a metal matrix, the method comprising steps of:
A method for dispersing second phase material in a metal, metal alloy or intermetallic, comprising adding a preformed intermediate material containing in-situ precipitated second phase material comprising an oxide, nitride, boride, carbide, silicide, sulfide or oxysulfide of a transition metal of the third to sixth groups of the Periodic Table, in an intermediate metal matrix, to molten host metal, metal alloy or intermetallic in which said dispersoids are substantially insoluble, mixing, and recovering a product containing the second phase material dispersed therein.
A method for dispersing second phase material in a metal, metal alloy, or intermetallic, comprising admixing a preformed intermediate material containing in-situ precipitated second phase material, comprising an oxide, nitride, boride, carbide, silicide, sulfide or oxysulfide of a transition metal of the third to sixth groups of the Periodic Table in an intermediate metal matrix, with solid host metal, metal alloy, or intermetallic in which said dispersoids are substantially insoluble, heating to melt the host metal, mixing, and recovering a product containing the second phase material dispersed therein.
A method for dispersing second phase material in a metal, metal alloy or intermetallic, comprising preforming an intermediate material containing insoluble second phase dispersoids, by exothermically reacting second phase forming constituents in the presence of a substantially nonreactive metal, adding thus formed intermediate material to molten host metal, metal alloy or intermetallic in which said dispersoids are substantially insoluble, mixing, and recovering a product containing the second phase material dispersed therein.
A method for dispersing second phase material in a metal, metal alloy, or intermetallic, comprising admixing a preformed intermediate material, containing insoluble second phase dispersoids in an intermediate metal matrix, prepared by the exothermic reaction of second phase forming constituents in the presence of a substantially nonreactive metal, with solid host metal, metal alloy, or intermetallic in which said dispersoids are substantially insoluble, heating to melt the host metal, mixing, and recovering a product containing the second phase material dispersed therein.
A method for the production of metal-second phase composite materials, the method comprising adding at least one in-situ precipitated second phase material in an intermediate metal matrix to a bath of molten host metal, metal alloy, or intermetallic in which said second phase is substantially insoluble, mixing, and recovering a product.
A method for the production of metal-second phase composite materials, the method comprising admixing at least one in-situ precipitated second phase material in an intermediate metal matrix with solid host metal, metal alloy, or intermetallic, heating until molten, and mixing, said second phase being substantially insoluble in said host metal.
A method for the production of metal-second phase composite materials, the method comprising adding an intermediate material, containing second phase particles produced by the exothermic reaction of reactive second phase-forming constituents in the presence of a substantially nonreactive metal, to a bath of a molten host metal, metal alloy, or intermetallic in which said second phase is substantially insoluble, mixing, and recovering a product.
Dependencies are inferred from the claim text.