FFKM-Coated Annular Laminate for Low-Pressure Hermetic Sealing
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Solution Overview
Problem
Metal seals used in vacuum apparatuses require high crushing pressure for hermetic closure, which damages the flange surface, making repeated use impossible. Additionally, elastomer seals like FFKM lack high-temperature radical resistance and can fail to maintain hermetic closure under high temperatures.
Innovation Solution
An annular laminate comprising a substrate coated with a rubber coating film made from a crosslinked product of a composition including a crosslinkable perfluoroelastomer (FFKM), a specific crosslinking agent, and a solvent. The rubber coating film provides high radical resistance at high temperatures and allows for high hermetic closure with low crushing pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal seal is used to ensure hermetic closure, then higher hermetic closure is achieved, but the flange surface is damaged making repeated use impossible
Solution Approach 1:
The invention uses a composite structure consisting of a metal seal substrate coated with an FFKM rubber coating film. The metal substrate provides the necessary mechanical strength and initial hermetic closure, while the rubber coating film protects the flange surface from damage. This composite material approach allows the seal to maintain hermetic closure while being gentler on the mating surfaces.
Solution Approach 2:
The rubber coating film is applied locally on the sealing surface of the metal seal, creating a region with different properties than the bulk metal. This localized rubber layer provides the necessary compliance and surface protection exactly where contact with the flange occurs, while the metal substrate maintains its structural integrity and sealing force.
2Object-affected harmful factors
If an elastomer seal made from FFKM is used, then the flange surface is not damaged, but higher hermetic closure is required and radical resistance at high temperature is insufficient
Solution Approach 1:
The invention creates a composite seal where the FFKM rubber coating film provides flange surface protection and chemical resistance, while the metal substrate provides the mechanical strength and pressure-bearing capability needed for reliable hermetic closure. This composite structure combines the advantages of both materials.
Solution Approach 2:
The invention changes the physical and chemical parameters of the rubber material by using crosslinked FFKM with specific molecular weight and crosslinking density. This modification enhances the rubber's high-temperature radical resistance while maintaining its protective properties, allowing it to withstand harsh processing conditions.
3Object-affected harmful factors
If a crosslinked perfluoroelastomer coating is applied to a metal seal, then flange surface protection is improved, but radical resistance at high temperature decreases causing the coating to melt
Solution Approach 1:
The invention carefully controls the molecular weight, crosslinking density, and chemical composition of the FFKM rubber coating film. By optimizing these parameters, the coating achieves sufficient protection at operating temperatures while maintaining adequate radical resistance. The crosslinking is controlled to provide protection without creating a coating that is too rigid or temperature-sensitive.
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 annular laminate achieves high radical resistance at high temperatures and provides high hermetic closure with low crushing pressure, preventing damage to the flange surface and enabling repeated use.
Implementation Method 1
the rubber coating film comprises a crosslinked product of a composition comprising a crosslinkable perfluoroelastomer (FFKM), a crosslinking agent, and a solvent
Data Source
AI summary
The present invention relates to an annular laminate including a substrate and a rubber coating film laminated in contact with the substrate, wherein the rubber coating film includes a crosslinked product of a composition including a crosslinkable perfluoroelastomer (FFKM), a crosslinking agent including at least one of compounds represented by general formulas (1) to (3), and a solvent, and a thickness of the rubber coating film is 1 μm or more and 500 μm or less. According to the present invention, provided are an annular laminate that has good hermetic closure even with a low crushing pressure and can be used as a seal material exhibiting high radical resistance at a high temperature, and a method for manufacturing the same.