Micromechanical Part Fabrication Using Thin Synthetic Carbon Layer
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Solution Overview
Problem
The fabrication of micromechanical parts from synthetic diamond or DLC is expensive and tribologically disadvantageous due to roughness issues from thick layer deposition or etching methods, limiting the ability to achieve complex shapes with thin coatings.
Innovation Solution
A method involving forming a substrate with a negative cavity, coating it with a thin layer of material, removing excess substrate to leave a minimal layer thickness, and releasing the micromechanical part, which can be reinforced or decorated with a second material, such as metal, to achieve improved roughness and reduced material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a thick layer of synthetic diamond or DLC is deposited to fabricate a micromechanical part, then the part can be formed, but the roughness of the surface deteriorates and tribological performance worsens
Solution Approach 1:
The invention changes the parameter of layer thickness from thick to thin, and uses a two-stage process where a thin layer is deposited first to capture the substrate roughness, then a second material is added to complete the part geometry. This parameter change resolves the contradiction by preserving surface quality while achieving the required part dimensions.
Solution Approach 2:
The invention segments the material deposition into two distinct stages: first depositing a thin layer of synthetic diamond or DLC to preserve surface roughness characteristics, then adding a second material (such as metal or polymer) to complete the part geometry. This segmentation allows each material to serve its optimal function without compromising the other.
2Reliability
If a thin layer of synthetic diamond or DLC is deposited to improve tribological performance, then roughness improves, but the ability to obtain complex shapes is limited
Solution Approach 1:
The invention uses composite materials by combining a thin layer of synthetic diamond or DLC with a second material (metal or polymer) to achieve both tribological performance and complex geometry. The first material provides the surface properties while the second material enables complex shape formation without compromising the thin-layer advantage.
3Reliability
If synthetic diamond or DLC is used to fabricate micromechanical parts, then tribological performance can be achieved, but production cost increases significantly
Solution Approach 1:
The invention applies local quality by using synthetic diamond or DLC only where tribological performance is critical (the surface layer), while the bulk of the part is made from a second, less expensive material. This localized application of high-performance material achieves the required tribological properties while significantly reducing overall production cost.
Solution Approach 2:
The invention changes the parameter of material thickness from thick to thin, using only a thin layer of expensive synthetic diamond or DLC material. This parameter change dramatically reduces material cost while maintaining tribological performance, as the expensive material is applied only where needed for surface performance.
4Shape
If etching methods are used in the bulk to fabricate micromechanical parts, then complex shapes can be obtained, but surface roughness deteriorates
Solution Approach 1:
The invention inverts the conventional approach by building the part from the inside out rather than removing material from the outside in. Instead of etching from the bulk (which damages the surface), a thin layer is deposited on a substrate and then built up with a second material to create complex geometries, preserving the original surface quality throughout the process.
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 allows for the creation of single-piece micromechanical parts with favorable roughness and reduced material usage, enhancing tribological performance and production efficiency, enabling the production of complex geometries like watch components without the limitations of traditional methods.
Implementation Method 1
coating said negative cavity of the substrate with a layer of material
Data Source
AI summary
A method of fabricating a micromechanical part in a single-piece made of a synthetic carbon-allotrope includes forming a substrate which includes the negative cavity for the micromechanical part to be fabricated, coating the negative cavity of the substrate with a layer of the synthetic carbon allotrope in a thickness of between 0.2 μm and 20 μm, the thickness being less than the depth of the negative cavity, removing from the substrate a larger thickness than the thickness of the deposited layer, so as to leave a limited thickness of the layer of material in the negative cavity, and removing the substrate so as to release the single-piece micromechanical part formed in the negative cavity comprising an external surface of comparable roughness to that of the substrate.