Abstract:
A method for making a composite material. Porous reinforcing material such as fiber material is charged into a container which has an opening; then substantially all of the atmospheric air in the container and in the interstices of the reinforcing material is replaced by substantially pure oxygen; and then molten matrix metal is admitted into the container through the opening so as to infiltrate into the interstices of the reinforcing material. During this infiltration the oxygen within the container and in these interstices is absorbed by an oxidization reaction, and thus substantially all the gas present within the interstices of the reinforcing material is disposed of, thus not hampering the good infiltration of the molten matrix metal into the reinforcing material. Thus a high quality composite material is formed. The oxidization reaction may either be with the molten matrix metal itself, or with a getter element provided within the container.
Abstract:
This invention relates to a composite material comprising an in-situ precipitated second phase in an intermetallic matrix, and to the process for making such a composite.
Abstract:
Silicon carbide particulate reinforced aluminum alloy matrix composites are formed using techniques which include agitation of a melt of aluminum alloy, containing magnesium, and silicon carbide particulates in a manner whereby the silicon carbide particles are maintained, during agitation, within the body of the melt; the agitation, which involves shearing or wiping of the particles in the liquid, is carried out under vacuum; and may involve incorporation into the melt of an additional amount of magnesium such that that amount compensates for the amount of magnesium which segregates to the carbide surfaces, and is sufficient to effect strengthening of the resulting composite. Aluminum alloy matrix composites, containing copper, are produced using similar agitation and mixing procedures, with the copper being incorporated in such a way as to discourage reaction between the copper and SiC particles.
Abstract:
A method for welding metal composite materials, including metal-ceramic composites, whereby a weld or filler material is prepared by the in-situ precipitation of ceramic in a metallic matrix. The filler material may comprise boride, carbide, oxide, nitride, silicide, etc., while the matrix metal may constitute a alloy or intermetallic of two or more metals. A strong bond is achieved when welding two conventional metals, a conventional metal and a metal-ceramic composite, or two metal-ceramic composites.
Abstract:
Reinforced composite aluminum-matrix articles containing silicon carbide fibers or particles, are produced by a casting process wherein the silicon carbide fibers or particles are mixed with dehydrated sodium tetraborate and mixed with molten aluminum or aluminum alloy whereby wetting of the reinforcing material and ready dispersal thereof in the aluminum matrix alloy is facilitated.
Abstract:
A method of treating filaments in order to increase their wettability by molten magnesium or an alloy thereof. The filaments are treated by coating them with particulate molybdenum trioxide, chromic oxide, ferric oxide or nickel oxide and subsequently infiltrating them with molten magnesium or an alloy thereof.
Abstract:
A compound substance of great hardness and toughness, comprising a metal matrix, having embedded therein, hard material granules of a size of 0.1 to 5 mm. The metal matrix comprises 1 to 4% carbon, 0.3 to 0.6% silicon, 0.5 to 1.5% manganese, 0.8 to 2.8% vanadium, 0.5 to 1.5% chromium, 2 to 10% tungsten, about 0.01% aluminum and the remainder, iron.
Abstract:
An aluminum-based composite comprising an aluminum or aluminumalloy matrix and finely divided particles of an inorganic wearresistant material, i.e., ceramic, dispersed in the matrix, such particles consisting of a mixture of coarse particles of about 20 Mu to 100 Mu in diameter and fine particles of about 0.5 Mu to 9 Mu in diameter in a ratio of 1.5-4:1 in volume and exceeding 50% of the total volume of the composite.
Abstract:
Composites formed of incompatible constituents, i.e., constituents which are mutually insoluble, are produced by introducing at least one such constituent in coated form into a molten bath of the other, the bath being subjected to the influence of a vortex.
Abstract:
COMPOSITE METAL-NON-METAL STRUCTURES ARE OBTAINED FIRST MOLDING A POROUS PERFORM OF THE NON-METAL IN PARTICULATE FORM USING A BINDER WHICH WILL BOND THE PARTICLES BY PYROLYSIS PHENOMENON. THE PREFORM IS THEN TRNASFERRED TO A MOLD WHERE IT IS THOROUGHLY IMPREGNATED BY MOLTEN METAL.