Multi-Material Graded Structures With Continuous Additive Fabrication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for fabricating graded components are not continuous, leading to inefficiencies and limitations in large-scale production, with composition gradients being discontinuous and requiring multiple layers, which results in performance degradation and failure.
Innovation Solution
A method utilizing additive manufacturing with a high energy source and multiple material storage to create a melt pool, allowing for precise control of material mixture and deposition to form a solid graded multi-material structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional methods (chemical vapor deposition, tape casting, screen printing, slurry-spraying, spray-painting, slurry coating) are used to fabricate graded components, then composition gradients can be achieved with two or three layers of different compositions, but the gradient remains large and discontinuous, and the production process is not continuous leading to production disruption when changing raw material
Solution Approach 1:
The patent implements continuous fabrication of graded structures through additive manufacturing, where materials are continuously fed into a melt pool formed by a high energy source. This eliminates production disruption when changing raw materials, as the process can continuously incorporate different materials without stopping, thereby maintaining both smooth composition gradients and high productivity
Solution Approach 2:
The patent changes the physical state of materials from solid powder to molten state within the melt pool, enabling continuous mixing and deposition. By controlling the feed rates and composition of materials entering the melt pool, smooth composition gradients are achieved while maintaining continuous production, resolving the contradiction between gradient precision and productivity
2Reliability
If two or three layers with different compositions are used to reach composition gradients, then the gradient structure can be formed, but the gradient remains large and discontinuous causing performance degradation and failure
Solution Approach 1:
The patent segments the composition gradient into numerous fine increments by continuously varying the material feed composition ratio as materials are deposited layer by layer. This creates many thin layers with gradually changing compositions rather than just two or three discrete layers, achieving smooth transitions that eliminate performance degradation while maintaining high gradient continuity
Solution Approach 2:
The patent dynamically adjusts the composition ratio of materials fed into the melt pool during the fabrication process. By continuously varying the feed rates of different materials based on the desired gradient profile, smooth composition transitions are achieved, improving both reliability and gradient continuity
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
Enables continuous fabrication of graded structures with smooth transitions, enhancing performance and efficiency by reducing thermal stresses and increasing interface area, suitable for energy conversion devices like fuel cells and batteries.
Implementation Method 1
a multi-material graded structure formed from materials that are mixed and melted into a melt pool utilizing a high energy source
Data Source
AI summary
A system and method of continuous fabrication of multi-material graded structures using additive manufacturing is disclosed. Using multi-material feedstocks and optimized processing parameters, the gradient on composition and structure are controlled to achieve smooth transition from one functional component to another functional component. A multi-material graded structure is produced as the feedstocks are transported from the feedstock reservoir system comprised of many different materials. Interface transition from one functional layer to the next is gradient, controlled by feedstock mixture ratios based on the flow rate control for the feedstock system. Composition includes chemical composition, physical composition, and porosity. Continuous automatic additive manufacturing method makes the fabrication more efficient and avoids joining problems. This method finds application in fabrication of a fuel cell, battery, reformer and other chemical reaction and process units, including structures made of multiple units, such as stacks, that incorporate multiple functional components.