Selective Diamond Coating on Cemented Carbide
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Solution Overview
Problem
Existing methods for depositing diamond coatings on substrates with complex geometries face challenges in achieving selective coating without damaging uncoated areas, particularly during chemical pre-treatment and coating processes.
Innovation Solution
A method involving a latex-mask applied to uncoated areas before chemical pre-treatment, followed by removal of the mask and application of copper covers to protect uncoated areas during diamond coating, ensuring selective deposition of diamond coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical pre-treatment is applied to remove Co binder from cemented carbide substrates, then diamond coating adhesion is improved, but uncoated areas of complex geometries may be damaged or altered
Solution Approach 1:
A latex mask is applied as an intermediary protective layer to uncoated areas before chemical pre-treatment. This mask prevents the chemical etching solution from contacting and damaging the uncoated cemented carbide surfaces, while allowing the selected areas to undergo complete Co binder removal for optimal diamond coating adhesion.
Solution Approach 2:
The substrate surface is segmented into selected areas for coating and unselected areas for protection. The latex mask is applied selectively to cover only the uncoated portions, enabling differentiated treatment of different surface regions during the chemical pre-treatment process.
2Stability of the object's composition
If complete surface coating is performed, then coating uniformity is improved, but selective coating capability is lost
Solution Approach 1:
The substrate surface is divided into selected and unselected areas. The latex mask is applied to protect unselected areas during the coating process, enabling selective diamond coating only on the desired surfaces while maintaining uniform coating quality on the coated areas.
3Manufacturing precision
If masking steps are added to protect uncoated areas, then selective coating precision is improved, but process complexity increases
Solution Approach 1:
The latex mask is a disposable, low-cost protective layer that can be easily applied and removed. It provides effective protection during the coating process but does not require complex recovery or recycling systems, thereby minimizing the increase in process complexity while achieving high selective coating precision.
Solution Approach 2:
The latex mask is implemented as a flexible thin film that can conform to complex substrate geometries. This flexibility allows the mask to be applied to various shapes and configurations without requiring complex rigid masking structures, thus reducing overall process complexity while maintaining high precision in selective coating.
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 effective selective diamond coating on complex geometries without damaging uncoated areas, maintaining coating quality and ecological safety.
Implementation Method 1
the areas of the substrate surfaces that are not selected to be coated but could be chemically attacked during conduction of the one or more chemical pre-treatments steps, are masked by applying a latex-mask in such a manner that the latex-mask cover the substrate material areas that need to be prevented from being affected by any chemical attacks
Implementation Method 2
a coating step, in which one or more diamond coatings are deposited on the areas of the substrate surfaces selected to be coated
Implementation Method 3
one or more chemical pre-treatment steps, in which Co binder is removed from the cemented carbide material comprised in the substrate surfaces
Data Source
AI summary
A method for producing a selective diamond-coated substrate, wherein the diamond-coated substrate includes: a substrate having surfaces including cemented carbide material, areas selected to be coated, and areas not selected to be coated; and one or more diamond coatings on the areas selected to be coated, the method including following steps in order: a first masking step, wherein the areas not selected to be coated but could be chemically attacked during a chemical pre-treatment step, are masked by applying a latex-mask covering these areas; one or more chemical pre-treatment steps; a mask-removing step, wherein the latex-mask is removed; a second masking step, wherein the areas of the substrate surfaces from which the latex-mask was removed and not selected to be coated but could be coated with one or more diamond coatings during one or more coating steps, are covered with one or more masking-covers; and one or more coating steps.