Glassy Carbon Mechanical Seal Faces for Deposit and Wear Resistance
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Solution Overview
Problem
Conventional sliding components, such as mechanical seals, face issues with deposit formation due to negative pressure and wear, particularly when using antifreeze with rust inhibitors, leading to reduced sealing efficiency and wear resistance.
Innovation Solution
A sliding component design featuring an annular stationary-side and rotating-side seal ring with a substrate and a glassy carbon sheet member adhered via a thermosetting resin adhesion layer, which prevents deposit formation and enhances wear resistance by facilitating gas escape and allowing for easier manufacturing and surface texture formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a diamond-like carbon film is used to prevent deposit formation, then deposit resistance is improved, but durability deteriorates because the film peels off
Solution Approach 1:
The invention uses a composite structure consisting of a substrate and a glassy carbon coating layer. The substrate provides mechanical strength and durability, while the glassy carbon layer provides deposit resistance and low friction. This composite approach allows both durability and deposit resistance to coexist without the peeling problem of thin diamond-like carbon films.
2Object-affected harmful factors
If glassy carbon is used for the entire sliding face, then deposit formation is prevented, but manufacturing becomes difficult and time-consuming
Solution Approach 1:
Instead of making the entire sliding face from glassy carbon, the invention applies glassy carbon only as a coating layer on the substrate. This local application of glassy carbon properties to the sliding surface maintains deposit prevention while significantly reducing manufacturing complexity and time compared to producing large-volume glassy carbon components.
3Object-affected harmful factors
If glassy carbon is used for large-volume components, then deposit resistance is maintained, but cracks or deformation occur due to trapped gas
Solution Approach 1:
The invention segments the component into two parts: a substrate that provides structural integrity and a glassy carbon coating that provides deposit resistance. This segmentation allows the substrate to be manufactured without the gas trapping problems of large-volume glassy carbon, while still maintaining deposit resistance through the coating layer.
4Manufacturing precision
If advanced manufacturing techniques are used to create glassy carbon surfaces, then surface quality is improved, but device complexity increases
Solution Approach 1:
The invention uses a coating approach rather than advanced manufacturing techniques to create complex glassy carbon structures. The glassy carbon is applied as a relatively simple coating layer on a standard substrate, avoiding the need for complex laser processing, ultrashort pulse irradiation, or other advanced manufacturing techniques that would increase device complexity.
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 solution effectively prevents deposit formation and improves sealing and wear resistance, enabling the production of larger components without advanced techniques and allowing for improved lubrication performance through dynamic pressure generation.
Implementation Method 1
a glassy carbon sheet member stuck on the substrate via the adhesion layer
Implementation Method 2
negative pressure can be generated in a sliding face, depending on its characteristics
Implementation Method 3
a sealed fluid entering the sliding face due to the negative pressure can evaporate, causing a deposit formation-causing substance to be excessively precipitated and formed
Implementation Method 4
a sliding face of a sliding member is coated with diamond-like carbon, thereby preventing the buildup of deposits on a surface
Implementation Method 5
allowing for improved lubrication performance through dynamic pressure generation
Data Source
AI summary
A sliding component includes a stationary-side seal ring and a rotating-side seal ring. The stationary-side seal ring and the rotating-side seal ring have their respective sliding faces opposite to each other. The sliding faces are relatively rotated, thereby sealing a high-pressure fluid present on one radial side of the sliding faces relatively rotationally sliding. At least one of the stationary-side seal ring and the rotating-side seal ring includes a substrate, an adhesion layer on the sliding face side of the substrate, and a glassy carbon sheet member stuck on the substrate via the adhesion layer.