Kovar Seal Ring Nickel Layer Stain Prevention
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Solution Overview
Problem
Conventional seal rings used in electronic component housing packages suffer from stain generation on the metal layer surface, leading to deteriorated airtightness due to unavoidable impurities like silicon oxide, aluminum oxide, and manganese sulfide being rolled out during the production process.
Innovation Solution
A nickel layer is applied to the surface of the base material opposite the metal brazing material layer before rolling, with a thickness between 0.1 to 20 μm, to block impurities and prevent stain formation, ensuring excellent airtightness between the seal ring and the lid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal layer is provided on the seal ring surface, then airtightness is improved, but stains are generated on the surface due to impurity rolling
Solution Approach 1:
A nickel layer is applied to the base material surface before the rolling process to prevent impurities from being rolled out during subsequent manufacturing steps. This preliminary protective layer blocks the harmful impurities (silicon oxide, aluminum oxide, manganese sulfide) from reaching the final surface, thereby preventing stain generation while maintaining the airtightness function of the metal layer.
Solution Approach 2:
The nickel layer serves as an intermediary barrier between the base material containing impurities and the final metal layer surface. This intermediate layer prevents direct contact between the rolled impurities and the surface, eliminating the stain formation problem while allowing the structure to maintain its airtight sealing function.
2Object-generated harmful factors
If impurities are removed from the base material, then stain generation is prevented, but manufacturing complexity increases
Solution Approach 1:
Instead of attempting to remove impurities from the base material through complex purification processes, a nickel layer is applied in advance to the surface. This preliminary protective measure prevents impurity-related stains during rolling without requiring changes to the base material composition or complex additional processing steps.
3Object-generated harmful factors
If the nickel layer thickness is increased, then impurity blocking is improved, but material cost and processing complexity increase
Solution Approach 1:
The nickel layer thickness is optimized to a specific range (0.1 to 20 μm) to achieve the minimum effective blocking of impurities while avoiding excessive material usage and processing complexity. This parameter optimization ensures sufficient impurity prevention capability without unnecessary increases in cost or manufacturing difficulty.
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 nickel layer effectively blocks impurities from rising to the surface, preventing stain formation and enhancing the airtightness of the electronic component housing package, thereby maintaining the integrity of the seal.
Implementation Method 1
a nickel layer is provided on one surface (a surface opposite the surface on which a metal brazing material layer is provided) of a base material before applying a rolling treatment... the nickel layer effectively blocks impurities from rising to the surface
Data Source
AI summary
An object of the present invention is to provide a seal ring having a metal brazing material layer on one surface of a base material containing KOVAR and a metal plating layer on the other surface, ensuring that the seal ring can prevent generation of a stain on the surface of a metal plating layer and excellent airtightness of an electronic component housing package can be achieved. The present invention has attained the object above by a seal ring which is an annular sealing ring having a nickel layer on the first surface of a base material containing KOVAR (iron-nickel-cobalt alloy) and a metal brazing material layer on the second surface opposite the first surface, wherein the thickness of the nickel layer is from 0.1 to 20 μm.