Method for producing metal or alloy casting composites reinforced with fibrous or particulate materials
AssigneeBattelle Memorial Institute
InventorsMark Jolly, Guy Negaty-Hindi, Georges Haour
Life of this patent
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Abstract
A framework template of non-reinforcing material is provided containing, distributed therein and bonded to the building constituents thereof, a reinforcing material such as particles, fibers or whiskers of high tenacity nitrides, carbides, borides, oxides and the like, this distribution being arranged according to some given pattern of orientation and packing density. The template is placed in a mould which is then filled with molten metal which solidifies by cooling. During casting, the constituents of the template may be destroyed by the heat, or they may dissolve in the metal, or they can remain embedded therein.
Claims19
A method for producing metal or alloy casting composites, consisting essentially of a metal matrix reinforced with fibers or particles of reinforcing material distributed in this matrix according to a desired pattern, which comprises the steps of:
- (a) providing a self-supporting template preform structure having no to little reinforcing properties, made of a porous body or of a network of cross-linked building constituents containing particles or fibers of reinforcing material distributed in pores or in voids between said constituents of the structure and binding said particles or fibers of reinforcing material according to a desired pattern, to said constituents of said preform structure by adding a binder substance;
- (b) introducing said preform structure into a casting mould or die, filling said mould or die with a molten metal or alloy and causing said molten metal or alloy to infiltrate interstices in the preform structure and thus embed said particles or fibers within the metal to form a matrix of a casting composite;
- and
- (c) allowing the molten metal or alloy to solidify, and separating the resulting solidified casting composite from the mould.
A method for producing metal or alloy casting composites, consisting essentially of a metal matrix reinforced with fibers or particles of reinforcing material distributed in this matrix according to a desired pattern, which comprises the steps of:
- (a) providing a self-supporting template preform structure made of a porous body or of a network of cross-linked building constituents containing particles or fibers of reinforcing material distributed in pores or in voids between said constituents of the structure and binding said particles or fibers of reinforcing material according to a desired pattern, to said constituents of said preform structure by adding a binder substance, said step (a) being achieved by,
- (i) forming a homogeneous slurry of preform building constituents and said binder in a liquid medium, and
- (ii) forming this slurry into a cake in a desired preform shape and removing liquid from the cake to obtain a dry preform structure;
- (b) introducing said preform structure into a casting mould or die, filling said mould or die with a molten metal or alloy and causing said molten metal or alloy to infiltrate interstices in the preform structure and thus embed said particles or fibers within the metal to form a matrix of a casting composite;
- and
- (c) allowing the molten metal or alloy to solidify, and separating the resulting solidified casting composite from the mould.
A method for producing metal or alloy casting composites, consisting essentially of a metal matrix reinforced with fibers or particles of reinforcing material distributed in this matrix according to a desired pattern, which comprises the steps of:
- (a) providing a self-supporting template preform structure having no to little reinforcing properties, made of a porous body or of a network of cross-linking building constituents containing, particles or fibers of reinforcing material distributed in pores or in voids between said constituents of the structure and binding said particles or fibers of reinforcing material according to a desired pattern, to said constituents of said preform structure by coating said constituents with said particles of reinforcing material;
- (b) introducing said preform structure into a casting mould or die, filling said mould or die with a molten metal or alloy and causing said molten metal or alloy to infiltrate interstices in the preform structure and thus embed said particles or fibers within the metal to form a matrix of a casting composite;
- and
- (c) allowing the molten metal or alloy to solidify, and separating the resulting solidified casting composite from the mould.
Dependencies are inferred from the claim text.