Heterogeneous Foil Stacks for Homogeneous Light Alloy Parts
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Solution Overview
Problem
Laminated object manufacturing (LOM) techniques often result in composition gradients within assembled parts, leading to mechanical properties that do not match those predicted by the average alloy composition, due to differences in bonded regions and structural parts.
Innovation Solution
A method involving stacking foils with different compositions, applying heat at specific temperatures to bond and homogenize the foils, resulting in a solid object with a desired alloy composition, utilizing diffusion bonding, transient liquid phase diffusion bonding, or brazing to form strong metallic bonds without adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LOM techniques are used to assemble parts from multiple foils, then manufacturing complexity is reduced and productivity is improved, but composition gradients are created in bonded regions causing mechanical properties to deviate from predicted values
Solution Approach 1:
The patent applies heat treatment at controlled temperatures to change the physical and chemical parameters of the bonded regions. By heating to specific temperatures and holding for defined periods, the alloy composition is homogenized through diffusion processes, transforming the non-uniform as-built state into a uniform final state with predictable mechanical properties
Solution Approach 2:
The patent performs homogenization heat treatment as a preliminary or integrated step in the manufacturing process. By addressing the composition gradient issue through controlled heating and diffusion before final cooling and solidification, the method ensures uniform properties are achieved early in the process, preventing subsequent property deviations
2Adaptability or versatility
If foils with different compositions are stacked to achieve desired average alloy composition, then material versatility is improved, but composition heterogeneity is created throughout the bulk part
Solution Approach 1:
The patent uses heat treatment to change the distribution parameters of alloying elements within the stacked foils. By controlling temperature, time, and atmospheric conditions during heat treatment, the composition parameters are transformed from heterogeneous (layered) to homogeneous (uniformly distributed), enabling both material versatility and compositional stability
Solution Approach 2:
The patent explicitly addresses composition heterogeneity by applying homogenization heat treatment. This process creates a uniform distribution of alloying elements throughout the bulk part, ensuring that the final composition is homogeneous and predictable, while still allowing the use of different foil compositions during manufacturing
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves homogenized objects with consistent mechanical properties matching the desired alloy composition, improving the reliability and performance of LOM-produced parts by ensuring uniform composition throughout the object.
Implementation Method 1
utilizing diffusion bonding, transient liquid phase diffusion bonding, or brazing to form strong metallic bonds without adhesives
Implementation Method 2
utilizing diffusion bonding, transient liquid phase diffusion bonding, or brazing to form strong metallic bonds without adhesives
Implementation Method 3
applying heat to the stack at a second temperature to homogenize the composition of the stack
Data Source
AI summary
A method for the manufacturing of an object. The method includes receiving a desired alloy composition for the object, depositing a plurality of foils in a stack to form the object, applying heat to the stack at a first temperature to bond the plurality of foils to each other, and applying heat to the stack at a second temperature to homogenize the composition of the stack. The homogenized stack has the desired alloy composition.