Method for diffusion bonding of alloys having low solubility oxides
First Claim
1. A method for diffusion bonding surface layers of an alloy having surface oxide coatings of low solubility in the alloy, comprising the steps of:
- treating said alloy so that at least the surface layers to be bonded have a fine grain structure;
removing existing surface oxide coatings from the surface layers to be bonded;
diffusion bonding the surface layers to one another by placing the alloy to be bonded under a pressure sufficient to cause disruption of the oxide coatings and insufficient to cause macroscopic deformation of the alloy while heating the alloy in a non-oxidizing atmosphere for a time sufficient for diffusion bonding to occur.
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Abstract
Diffusion bonding of surface layers of an alloy, such as an aluminum alloy, having surface oxides of low solubility in the alloy includes treating the surface layers to be bonded to remove existing surface oxide coatings, and diffusion bonding the surface layers to one another by placing the alloy to be bonded under sufficient pressure to cause disruption of the oxide coatings by localized surface deformation of the alloy, enhanced by a superplastic microstructure, without substantial deformation of the alloy, i.e., macroscopic deformation approaching zero percent, while heating the alloy in a non-oxidizing atmosphere for a time sufficient for diffusion bonding to occur. The alloy may be treated so that at least the surface layers thereof have a fine grain structure of the type associated with superplastic forming properties. Components may be formed by diffusion bonding and superplastic forming.
281 Citations
27 Claims
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1. A method for diffusion bonding surface layers of an alloy having surface oxide coatings of low solubility in the alloy, comprising the steps of:
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treating said alloy so that at least the surface layers to be bonded have a fine grain structure; removing existing surface oxide coatings from the surface layers to be bonded; diffusion bonding the surface layers to one another by placing the alloy to be bonded under a pressure sufficient to cause disruption of the oxide coatings and insufficient to cause macroscopic deformation of the alloy while heating the alloy in a non-oxidizing atmosphere for a time sufficient for diffusion bonding to occur. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 26, 27)
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21. A method for diffusion bonding surface layers of alloys having surface oxide coatings of low solubility in the alloy, comprising the steps of:
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treating the surface layer of a first of said alloys so that it has a fine grained microstructure characteristic of superplasticity; treating the surface layers to be bonded to remove existing surface oxide coatings; diffusion bonding the surface layers to one another by placing the alloys to be bonded under sufficient pressure to cause disruption of the oxide coatings and insufficient to cause macroscopic deformation of the alloys while heating the alloys in a nonoxidizing atmosphere for a time sufficient for diffusion bonding to occur. - View Dependent Claims (22, 23, 24, 25)
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Specification