Ruthenium-Embedded Spark Plug Electrode Material
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Solution Overview
Problem
Spark plug electrodes in internal combustion engines face erosion and corrosion due to harsh environments, leading to performance issues and potential misfires, with precious metal solutions being costly and inefficient.
Innovation Solution
A spark plug electrode material comprising a ruthenium-based particulate component embedded within a precious metal matrix component, forming a metal composite that enhances erosion and corrosion resistance while reducing material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precious metals (platinum, iridium) are used for electrode material, then erosion and corrosion resistance is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies composite materials by combining ruthenium-based particulate component (providing erosion and corrosion resistance) with a metal matrix component (providing ductility and structural integrity). This composite structure achieves the protective properties of precious metals while using less expensive materials, thereby improving reliability while reducing manufacturing cost.
2Ease of manufacture
If precious metals are used only at firing tip, then material cost is reduced, but erosion and corrosion protection is insufficient at other electrode portions
Solution Approach 1:
The patent applies local quality by creating a composite material where the ruthenium-based particulate component is distributed throughout the entire electrode material matrix. This ensures that every portion of the electrode (not just the firing tip) benefits from the erosion and corrosion resistance properties of the ruthenium particles, providing uniform protection across the entire electrode structure.
3Ease of manufacture
If ruthenium-based composite material is used, then precious metal usage is reduced, but material processing difficulty may increase
Solution Approach 1:
The patent applies parameter changes by carefully controlling the particle size, concentration, and distribution of the ruthenium-based particulate component within the metal matrix. By optimizing these parameters, the composite material achieves desirable properties (erosion/corrosion resistance with reduced precious metal content) while maintaining processability and avoiding excessive manufacturing 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 electrode material provides improved resistance to erosion and corrosion, maintaining spark plug performance and reducing the need for expensive precious metals, thus extending the lifespan and reliability of spark plugs.
Implementation Method 1
an electrode material that has a particulate component embedded within a matrix component in the form of a metal composite
Data Source
AI summary
An electrode material that may be used in spark plugs and other ignition devices including industrial plugs, aviation igniters, glow plugs, or any other device that is used to ignite an air/fuel mixture in an engine. The electrode material is a metal composite and includes a particulate component embedded or dispersed within a matrix component such that the metal composite has a multi-phase microstructure. In one embodiment, the metal composite includes a matrix component that includes a precious metal and makes up about 2-80% wt of the overall composite and a particulate component that includes a ruthenium-based material and makes up about 20-98% wt of the overall composite.