Carbide Sliding Ring With In Situ Diamond Coating
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Solution Overview
Problem
Carbidic materials used in sliding rings, such as WC or SiC, tend to lose structural cohesion and corrode when exposed to aggressive media, leading to reduced service life without effective prevention measures.
Innovation Solution
A diamond coating is applied to the surfaces of carbide-based sliding rings, grown in situ using CVD methods, providing wear resistance and preventing corrosion, with the option for electrical conductivity to dissipate electrostatic charges and prevent spark erosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbidic materials (WC or SiC) are used for sliding rings, then mechanical strength and temperature resistance are improved, but corrosion resistance in aggressive media deteriorates
Solution Approach 1:
The patent applies a diamond coating layer on the surface of carbidic material (WC or SiC) sliding rings. This composite structure combines the mechanical strength and temperature resistance of carbidic materials with the exceptional corrosion resistance of diamond, resolving the contradiction between mechanical performance and chemical stability in aggressive media.
Solution Approach 2:
The diamond coating acts as an intermediary protective layer between the carbidic material and the aggressive media. This intermediate layer prevents direct contact between the corrosive environment and the carbidic material, thereby preventing corrosion while maintaining the mechanical properties of the base material.
2Duration of action of moving object
If diamond coating is applied to sliding surfaces, then wear resistance is improved, but electrical conductivity may be reduced
Solution Approach 1:
The patent applies diamond coating selectively to specific surfaces of the sliding ring where wear resistance is needed, while leaving other areas with natural carbidic material conductivity. This local application strategy provides wear protection on sliding surfaces while maintaining electrical conductivity in areas where it is required.
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 diamond coating significantly extends the service life of sliding rings by preventing corrosion and wear, allowing use across a wide range of media, pressures, and temperatures, while also addressing electrostatic issues.
Implementation Method 1
with a diamond material, preferably grown in situ on the surfaces
Implementation Method 2
the corrosion of sliding rings of this type could be prevented... the advantageous properties of carbidic materials such as WC or SiC can be used in the presence of aggressive media that lead to corrosion by are prevented from contact with the carbidic material by the diamond coating
Implementation Method 3
the diamond layer can be electrically conductive at least in the areas of the base body that do not coincide with the sliding surface. This allows electrostatic charges to be dissipated and prevents any spark erosion
Data Source
AI summary
The invention relates to a sliding ring of a slide ring sealing arrangement, comprising a base body (10, 11) made of a carbide material. A wear-resistant coating (8, 9), made of a diamond material, is embodied on one of the front surfaces of the base body, said diamond material having a sliding surface (6, 7). At least the surface areas of the base body (10, 11), which are exposed to the medium which is to be sealed during operation, are hermetically sealed in one layer (8, 9, 12, 13) made of a diamond material having a layer thickness and/or configuration creating a layer that is impermeable to fluid. The properties of the diamond layer and/or the diamond material on the areas of the base body, which do not correspond to the sliding surface (6, 7), can be the same or different on the sliding surface side of the diamond layer (8, 9).