3D-Printed Diamond Semiconductor Without Greenware Shrinkage
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Solution Overview
Problem
Current 3D printing of ceramics requires the use of a preceramic polymer or ceramic particles plus binder to create a greenware intermediary, which necessitates heating in a kiln, leading to shrinkage and potential contamination from catalysts or binders.
Innovation Solution
3D printing ceramics using negative electron affinity nanoparticles and halogenated solutions to directly form ceramics without a greenware intermediary, eliminating the need for kiln heating and avoiding contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a preceramic polymer or ceramic particles plus binder is used to create a greenware intermediary, then the ceramic can be formed through additive manufacturing, but the process requires heating in a kiln which causes shrinkage and potential contamination from catalysts or binders
Solution Approach 1:
The patent removes the greenware intermediary step entirely from the manufacturing process. Instead of using preceramic polymers or ceramic particles with binders that require kiln heating, the invention directly deposits ceramic material layers that sinter immediately upon formation, eliminating the source of shrinkage and contamination
Solution Approach 2:
The ceramic material is prepared in advance with specific properties (nanoparticle form, negative electron affinity, halogenated solution composition) that enable direct sintering without requiring a greenware intermediary. This preliminary preparation allows the material to be deposited and sintered in one step, avoiding subsequent dimensional changes
2Ease of manufacture
If a preceramic polymer or ceramic particles plus binder is used to create a greenware intermediary, then the ceramic can be formed through additive manufacturing, but the process requires heating in a kiln which introduces contamination from catalysts or binders
Solution Approach 1:
The patent extracts and eliminates the binder and catalyst components from the manufacturing process. By using ceramic nanoparticles in a halogenated solution that sinter directly, the invention removes the sources of chemical contamination that would otherwise be present in the final ceramic product
Solution Approach 2:
The invention changes the physical and chemical parameters of the ceramic material from conventional particles with binders to nanoparticles with negative electron affinity in a halogenated solution. This parameter change enables direct sintering at lower temperatures without requiring catalysts or binders, thereby eliminating contamination
3Productivity
If conventional ceramic 3D printing is used, then ceramic objects can be manufactured, but the process requires high temperature heating which increases energy consumption
Solution Approach 1:
The invention changes the sintering temperature parameter from conventional high temperatures (requiring kiln heating) to lower temperatures enabled by the nanoparticle-halogenated solution system. The negative electron affinity nanoparticles facilitate electron emission and direct sintering at reduced temperatures, significantly lowering energy consumption
Solution Approach 2:
The invention utilizes a phase transition mechanism where the halogenated solution evaporates and the ceramic nanoparticles sinter directly upon laser irradiation. This phase transition approach allows sintering to occur locally and rapidly without requiring sustained high-temperature heating, thereby reducing overall energy consumption
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 method allows for the creation of ceramics with arbitrary shapes at room temperature, avoiding shrinkage and contamination, and enables the production of diamond and silicon carbide semiconductors without the need for a kiln.
Implementation Method 1
inducing the nanoparticle of the third neutral feedstock to emit solvated electrons into the halogenated solution using a laser to form, by reduction, a first layer of a neutral ceramic
Implementation Method 2
inducing the nanoparticle of the third neutral feedstock to emit solvated electrons into the halogenated solution using a laser to form, by reduction, a first layer of a neutral ceramic
Implementation Method 3
a nanoparticle having a negative electron affinity... inducing the nanoparticle of the third neutral feedstock to emit solvated electrons into the halogenated solution using a laser
Data Source
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AI summary
In an embodiment, a system includes a three-dimensional (3D) printer, a neutral feedstock, a p-doped feedstock, an n-doped feedstock, and a laser. The 3D printer includes a platen and an enclosure. The platen includes an inert metal. The enclosure includes an inert atmosphere. The neutral feedstock is configured to be deposited onto the platen. The neutral feedstock includes a halogenated solution and a nanoparticle having a negative electron affinity. The p-doped feedstock is configured to be deposited onto the platen. The p-doped feedstock includes a boronated compound introduced to the neutral feedstock. The n-doped feedstock is configured to be deposited onto the platen. The n-doped feedstock includes a phosphorous compound introduced to the neutral feedstock. The laser is configured to induce the nanoparticle to emit solvated electrons into the halogenated solution to form, by reduction, layers of a ceramic comprising a neutral layer, a p-doped layer, and an n-doped layer.