Exothermic wire for bonding substrates

Abstract

Heating cords, foils or tapes are first manufactured by cold drawing individual round wires of constituent materials in a blanketed gas environment. This cold drawing operation produces a clean surface free of oxides and other contamination. Second, the constituent strands are brought together and twisted, cold drawn, swaged, and/or friction welded to produce an integral rope in which the constituent materials are in intimate contact. The integral rope can then be applied directly or further shaped into a shape and/or thickness. By controlling the dimensional ratios of the component cross-sections, the degree of controllability of the exothermic reaction characteristics can be tuned. Once the integral rope is formed, it can be coated with a layer of brazing and/or molten material to facilitate subsequent operations. Multiple strands may be woven together to form a cloth structure. The heat release device may be used in the field of permanently joining gaskets to opposing surfaces, such as attaching a cylinder head to a cylinder block in the operating position.

Description

[0001] CROSS REFERENCE TO THIS APPLICATION [0002] This application claims priority to US Provisional Application No. 60 / 667,999, filed April 4, 2005. field of invention [0003] The present invention relates to an improved method of forming an exothermic material useful in a variety of applications and using the exothermic material to permanently seal the cylinder head to the block in an internal combustion engine. Background technique [0004] Reactive multilayer flakes and coatings are used in a wide variety of applications where a controlled amount of heat generation in planar areas is required. Such structures typically include a series of substrate support layers that, under appropriate stimuli, undergo exothermic chemical reactions that spread over their footprint and thereby generate just a controllable amount of heat. Such exothermic chemistries are useful as a source of heat for professional welding, soldering and brazing operations. Of course, these exothermic ...

AI Technical Summary

Problems solved by technology

Also, the manual folding of the sheet makes it difficult to mass-produce

Once many metal layers are rolled, the layers can be recoiled, causing separation of the layers and degradation of the resulting sheet

Such separation will also lead to unwanted surface oxidation of the interlayer by cold welding and prevent uniformity of the metal layers

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