Additive Manufacturing Metal Matrix Composites Oxidation Control
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Solution Overview
Problem
Existing 3D printing techniques face challenges in effectively using metals due to oxidation of metal powders during the fusion process, leading to poor bonding and complex fixturing requirements.
Innovation Solution
The use of metal powders mixed with a powder flux, such as rosin, as a reducing agent, combined with vacuum and inert atmosphere heating, ensures proper fusion of metal layers, and the application of selective deposition methods like inkjet printing to address oxidation issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal powders are used in 3D printing, then material properties are improved, but oxidation occurs during fusion process leading to poor bonding
Solution Approach 1:
The patent applies inert atmosphere by enclosing the 3D printing process in an inert gas environment (such as nitrogen or argon) to prevent oxidation of metal powders during the fusion process. This creates a protective atmosphere that eliminates oxygen contact with the metal particles, thereby resolving the contradiction between achieving strong bonding and preventing oxidation.
2Productivity
If conventional metal 3D printing methods are used, then metal objects can be produced, but complex fixturing requirements increase device complexity
Solution Approach 1:
The patent replaces complex mechanical fixturing systems with a binder-based approach where metal powders are bound together using a binding agent that can be selectively applied and activated. This substitution of mechanical constraints with chemical bonding mechanisms simplifies the device structure while maintaining production efficiency.
3Strength
If metal powders are heated for fusion, then bonding is achieved, but oxidation occurs during heating
Solution Approach 1:
The patent applies inert atmosphere by enclosing the heating and fusion process in an inert gas environment to prevent oxidation of metal powders during the thermal processing stage. This ensures that the high temperatures required for fusion bonding do not lead to oxidative degradation of the material.
Solution Approach 2:
The patent introduces a binder or flux as an intermediary substance that facilitates bonding between metal particles during heating. This intermediary material protects the metal surfaces from direct oxidation while enabling fusion, acting as a protective mediator during the thermal processing phase.
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
This approach enables the production of complex metal geometries with improved material properties and higher production rates, eliminating the need for complex fixturing and tool changes.
Implementation Method 1
metal powders mixed with a powder flux, such as rosin, as a reducing agent
Implementation Method 2
vacuum and inert atmosphere heating
Implementation Method 3
heating to a temperature sufficient to melt the bonding material and fuse the metal layers
Implementation Method 4
heating to a temperature sufficient to melt the bonding material and fuse the metal layers
Implementation Method 5
selective deposition methods like inkjet printing
Data Source
AI summary
A method, product, apparatus, and article of manufacture for the application of the Composite Based Additive Manufacturing (CBAM) method to produce objects in metal, and in metal fiber hybrids or composites. The approach has many advantages, including the ability to produce more complex geometries than conventional methods such as milling and casting, improved material properties, higher production rates and the elimination of complex fixturing, complex tool paths and tool changes and, for casting, the need for patterns and tools. The approach works by slicing a 3D model, selectively printing a fluid onto a sheet of substrate material for each layer based on the model, flooding onto the substrate a powdered metal to which the fluid adheres in printed areas, clamping and aligning a stack of coated sheets, heating the stacked sheets to melt the powdered metal and fuse the layers of substrate, and removing excess powder and unfused substrate.