Composite Seal Manufacturing via Nitride Layer Formation
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Solution Overview
Problem
Mechanical face seals experience wear due to frictional forces, leading to compromised sealing effectiveness and potential system failure, as existing technologies do not adequately address the wear caused by repeated exposure to excessive frictional forces.
Innovation Solution
A method of manufacturing a seal by forming a hardened metal layer on a metal base plate, melting it in a nitrogen atmosphere to create a titanium nitride layer, and depositing multiple layers of titanium alloy to form a main seal body portion with an outer titanium nitride seal layer, enhancing wear resistance and sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional seal is used, then the seal can perform basic sealing function, but the seal experiences wear due to frictional forces leading to compromised sealing effectiveness
Solution Approach 1:
The seal is constructed as a composite structure with a metal base plate providing structural support and a ceramic coating layer (aluminum oxide or titanium nitride) providing wear resistance. This combination of dissimilar materials with complementary properties resolves the contradiction between maintaining sealing effectiveness and extending service life under frictional conditions.
Solution Approach 2:
The surface properties of the seal are modified by applying a ceramic coating layer that fundamentally changes the friction and wear characteristics. The coating transforms the surface from a conventional metal surface to a hard, low-friction ceramic surface, thereby extending the seal's service life while maintaining its sealing function.
2Object-affected harmful factors
If the seal material is hardened to increase wear resistance, then the wear resistance improves, but the sealing effectiveness may be compromised due to reduced adaptability
Solution Approach 1:
The composite structure allows the bulk metal material to provide ductility and adaptability for maintaining sealing contact, while the ceramic coating provides the hardened wear-resistant surface. This resolves the contradiction between hardness for wear resistance and ductility for sealing adaptability.
Solution Approach 2:
The seal has non-uniform properties: the bulk material provides structural flexibility and adaptability, while only the surface layer provides hard wear resistance. This local differentiation of material properties allows the seal to simultaneously achieve wear resistance and sealing effectiveness.
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 resulting seal exhibits improved wear resistance and sealing effectiveness, capable of maintaining lubricant retention and preventing external debris entry, while effectively dissipating heat generated during frictional contact.
Implementation Method 1
melting the layer of the hardened metal layer in a nitrogen atmosphere to form a layer of metal nitride
Implementation Method 2
melting the layer of the hardened metal layer in a nitrogen atmosphere to form a layer of metal nitride
Implementation Method 3
depositing a plurality of layers of a metal alloy on the layer of metal nitride to form a main seal body portion
Data Source
AI summary
A method for manufacturing a seal is disclosed. The method includes forming a layer of a hardened metal layer on a metal base plate. Further, the method includes melting the layer of the hardened metal in a nitrogen atmosphere to form a layer of metal nitride. Furthermore, the method includes depositing a plurality of layers of a metal alloy on the layer of metal nitride to form a main seal body portion, wherein the layer of metal nitride and the main seal body portion together correspond to the seal.