For forming or consolidating organic matrix composites, for example, an organic matrix composite panel (106) is sealed between sheets of a susceptor material (100, 102) that is susceptible to induction heating. The susceptor sheets (100, 102) are heated inductively. The sheets in turn conduct heat to the organic matrix composite panel (106). When heated to the desired temperature, the composite panel (106) is consolidated and/or formed. In the present invention, the susceptor sheets are selected so that their magnetic permeability decreases to unity at approximately the desired operating temperature thereby limiting heating to this 'Curie temperature' and providing substantial uniformity of temperature in the panel. Of course, the concept applies to other induction heating operations for metals including SPF, brazing, annealing, heat treating, bonding, hot pressing, and the like.

Method for achieving thermal uniformity in induction processing of organic matrix composites or metals

A composite metallurgical product includes a roll cast aluminum alloy core and a filler material bonded on the core. Assemblies joined by filler material are formed from this product by heating to flow the filler material into joints and subsequent solidification of the filler material in the joints. The composite product is made in several ways, including lamination at roll caster rolls, and lamination or thermal spraying at the exit side of a roll caster. The invention additionally provides for an angulation rolling method for varying percent of cladding on the composite, and a high-manganese aluminum alloy useful as core material in brazing sheet clad with aluminum-silicon brazing alloy.

Clad metallurgical products and methods of manufacture

The present invention relates to multiple layer aluminum brazing sheet having a core (3), a braze cladding (1), and an interliner (2) therebetween that, when fabricated in the fully annealed condition (O-temper), forms a continuous and dense dispersoid band in the core (3) in addition to having an additional sacrificial layer for exceptional post brazed corrosion resistance. This present invention also relates to the process used to fabricate these alloys.

Ultra-longlife, high formability brazing sheet

The invention relates to a brazing sheet product having a core sheet (1) made of an aluminium alloy, having one or both of the surfaces of said core sheet clad with an aluminium clad layer (2), and a layer (3) comprising nickel on the outersurface of one or both said aluminium clad layer or layers (2), characterised in that there is a layer (4) comprising zinc or tin as a bonding layer between said outersurface of said aluminium clad layer or layers (2) and said layer (3) comprising nickel and wherein the aluminium clad alloy layer comprising, in weight percent: Si 2 to 18; Mg up to 8.0; Zn up to 5.0; Cu up to 5.0; Mn up to 0.30; In up to 0.30; Fe up to 0.80; Sr up to 0.20; at least one element selected from the group consisting of: Bi 0.01 to 1.0; Pb 0.01 to 1.0; Li 0.01 to 1.0; Sb 0.01 to 1.0; Mg 0.2 to 2.0 impurities each up to 0.05, total up to 0.20 balance aluminium.

Brazing sheet product and method of manufacturing an assembly using the brazing sheet product

Disclosed is an improved aluminum base alloy comprising an improved aluminum base alloy comprising 0.2 to 2 wt.% Si, 0.3 to 1.7 wt.% Mg, 0 to 1.2 wt.% Cu, 0 to 1.1 wt.% Mn, 0.01 to 0.4 wt.% Cr, and at least one of the elements selected from the group consisting of 0.01 to 0.3 wt.% V, 0.001 to 0.1 wt.% Be and 0.01 to 0.1 wt.% Sr, the remainder comprising aluminum, incidental elements and impurities. Also disclosed are methods of casting and thermomechanical processing of the alloy.

High strength MG-SI type aluminum alloy

A method for forming long lengths of composite material suitable for the subsequent manufacture of transition inserts comprising assembling a ferrous element and an aluminum element, and, if necessary, an aluminous bonding element into a prebond sandwich, heating the sandwich to a temperature between 400* and 900* F and subjecting the sandwich to a one-step thickness reduction by passing the sandwich through matching, rectangularly grooved rolls thereby forming a sound, solid phase metallurgical bond between the elements

Roll bonding an aluminum-ferrous composite with grooved rolls

A novel process for producing aluminum composite sheet products for roll forming and vacuum brazing is disclosed, which provides an unexpected improvement in the corrosion resistance of the brazed product. According to the process, a composite sheet is annealed to a strain-free state after having been rolled to a thickness which is a critical amount greater than the thickness ultimately sought. Following the annealing step, the sheet is cold worked to the desired thickness, the degree of reduction in this final step being within a critical range which provides the improvement in corrosion resistance to the final product after vacuum brazing.

Corrosion resistant vacuum brazing sheet

Corrosion resistance in a brazed aluminum product is improved by subjecting the product to a heat treatment at a temperature of 300° F. to 800° F. for at least about one hour, preferably preceded by cooling the product to a temperaure below the temperature ultimately selected for the treatment, and in any event below about 550° F. The useful life of brazed products such as automotive radiators is increased several times as a result of this treatment.

Thermal treatment of brazed products for improved corrosion resistance

An aluminium alloy contains vanadium as an alloying element. The vanadium is preferably at a concentration in the range from 0.02% to 0.4% by weight and imparts corrosion-resistance to the alloy, particularly when it is used as a core alloy in a vacuum brazing sheet. Further corrosion resistance is also achieved by processing the alloy or brazing sheet in such a manner that the final processing step is a cold working effected so as to reduce the sheet by 10% to 20%.

Corrosion-resistant aluminium core alloy

A novel aluminum alloy contains vanadium as an alloying element, at a concentration ranging from about 0.02% to about 0.4% by weight. The vanadium imparts corrosion resistance to the alloy, particularly when the alloy is used as a core alloy in a vacuum brazing sheet. A further improvement in corrosion resistance is achieved by processing the alloy or brazing sheet in such a manner that the final processing step is a cold work to a reduction of about 10% to about 20%.

Walter D Finnegan

Papers

Roll bonding an aluminum-ferrous composite with grooved rolls

Corrosion resistant vacuum brazing sheet

Thermal treatment of brazed products for improved corrosion resistance

Corrosion-resistant aluminium core alloy

Corrosion resistant aluminum core alloy