Barrier Layer Coating for Additive Manufacturing Particles
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Solution Overview
Problem
Existing additive manufacturing processes for metallic and ceramic components face issues such as discoloration, changes in material reactivity, and undesirable polymerization reactions due to direct contact between particles and binders, as well as absorption of elements like oxygen and carbon during debinding, which affect the properties of the final components.
Innovation Solution
Encapsulating metal and ceramic particles with a barrier layer that prevents contact with the binder and environment, reducing interactions that lead to discoloration, polymerization, and element absorption, while improving flowability and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If particles are directly contacted with binder for additive manufacturing, then the green part can be built up, but discoloration and polymerization reactions occur
Solution Approach 1:
A barrier layer is introduced as an intermediary substance between the particles and the binder. This barrier layer prevents direct contact between the binder and particle surfaces, thereby eliminating the harmful polymerization reactions and discoloration that occur when binder directly contacts metal or ceramic particles during additive manufacturing.
Solution Approach 2:
The barrier layer creates an inert environment around each particle, isolating the particle surface from the binder and preventing chemical reactions. This inert barrier effectively stops the transfer of metal ions to the binder and prevents cationic polymerization, while still allowing the green part to be successfully fabricated.
2Productivity
If particles are directly contacted with binder, then material composition can be applied, but metal ions transfer causing discoloration and reactivity changes
Solution Approach 1:
The barrier layer serves as a mediating barrier that prevents metal ions from transferring from particles to the binder during the printing process. This maintains the stability of the material composition and prevents discoloration, while still allowing the printing process to proceed efficiently with consistent material properties.
3Ease of manufacture
If particles absorb elements during debinding, then debinding process can be completed, but mechanical properties and conductivity deteriorate
Solution Approach 1:
The barrier layer acts as a protective intermediary during the debinding process, preventing oxygen and carbon from the binder from being absorbed by the particles. This maintains the mechanical properties and electrical conductivity of the final sintered component while still allowing the debinding process to be completed successfully.
Solution Approach 2:
The barrier layer creates an inert environment around particles during debinding, preventing oxidation and carbon absorption that would otherwise occur at temperatures between 100-600°C. This preserves the mechanical strength and electrical conductivity of the final component.
4Reliability
If barrier layer is applied to particles, then interaction with binder is reduced, but development time increases
Solution Approach 1:
The barrier layer is applied to particles in advance, before the additive manufacturing process begins. This preliminary coating ensures consistent interaction between particles and binder throughout production, reducing variability and actually streamlining the overall development process despite the additional coating step.
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 barrier layer enhances the additive manufacturing process by maintaining consistent interaction between particles and binder, reducing development time, and improving the properties of the sintered components by preventing oxidation, ion transfer, and polymerization reactions, thus ensuring better resolution and physical properties.
Implementation Method 1
The barrier properties of the barrier layer against oxygen provide protection against oxidation of the particles during storage, the printing process and debinding
Implementation Method 2
The barrier properties of the barrier layer against carbon cause a reduction in the absorption of carbon from the binder into the particles during debinding
Implementation Method 3
The barrier properties of the barrier layer against metal ions cause a reduction in the transfer of ions from the particles into the surrounding binder
Implementation Method 4
The barrier properties of the barrier layer against chemical reactions between the particles and the binder reduce any polymerization reaction caused by chemical reactions (e.g. cationic polymerization) on the surface
Data Source
AI summary
In a process for the additive manufacturing of at least one metallic and/or ceramic component, comprising a) the additive build-up of at least one green part in an additive printing device from a material composition comprising particles of metal and/or ceramic and an organic binder, b) the debinding of the at least one green part, and c) the sintering of the at least one green part to obtain the component, the particles are provided with at least one surrounding barrier layer.