Ruthenium Matrix Spark Plug Electrode Erosion Resistance
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Solution Overview
Problem
Spark plug electrodes in internal combustion engines face erosion and corrosion due to harsh operating conditions, leading to performance issues like misfires, and existing solutions using precious metals are costly and may suffer from the balling and bridging phenomenon.
Innovation Solution
A spark plug electrode material comprising ruthenium (Ru) as the single largest constituent, combined with other precious metals and metal oxides, which forms a matrix phase and dispersed phase to enhance corrosion and erosion resistance, preventing the balling and bridging phenomenon.
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 cost increases significantly
Solution Approach 1:
The patent uses composite materials consisting of ruthenium as the base metal combined with precious metals (platinum, iridium, or palladium) and metal oxides (such as yttrium oxide, zirconium oxide, or magnesium oxide). This composite structure provides erosion and corrosion resistance comparable to pure precious metals while reducing the quantity of expensive precious metals required, thereby lowering cost while maintaining reliability.
Solution Approach 2:
The patent changes the compositional parameters of the electrode material by using ruthenium (which has higher erosion resistance than traditional base metals) as the primary constituent (at least 50 wt%) combined with controlled amounts of precious metals (0.1-10 wt%) and metal oxides (0.1-5 wt%). This parameter optimization achieves protective performance接近 to pure precious metals at lower cost.
2Quantity of substance
If precious metals are used only at the firing tip, then cost is reduced, but erosion and corrosion protection is insufficient for the entire electrode
Solution Approach 1:
The patent applies local quality by concentrating the precious metal content specifically at the firing tip region where the spark occurs and erosion is most severe. The electrode material has higher precious metal concentration at the firing tip compared to the shank portion, providing enhanced protection where it is most needed while reducing overall precious metal usage and cost.
3Quantity of substance
If traditional base metals are used for electrodes, then cost is low, but erosion and corrosion resistance is insufficient in harsh combustion environment
Solution Approach 1:
The patent creates a composite material system where ruthenium (a base metal with superior erosion resistance) serves as the foundation, enhanced with precious metals and metal oxides. This composite provides protection levels approaching pure precious metals while maintaining cost advantages of base metals, resolving the contradiction between cost and reliability.
Solution Approach 2:
The patent fundamentally changes the base metal parameter from traditional metals (nickel, copper, steel) to ruthenium, which has significantly higher erosion and corrosion resistance. Combined with optimized ratios of precious metals (0.1-10 wt%) and metal oxides (0.1-5 wt%), this parameter change achieves high reliability at lower cost compared to pure precious metal electrodes.
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 significantly reduces erosion and corrosion, improving spark plug performance while minimizing the use of costly precious metals and preventing the balling and bridging issue.
Implementation Method 1
The electrode material significantly reduces erosion and corrosion
Implementation Method 2
The electrode material significantly reduces erosion and corrosion
Implementation Method 3
sintering the powder mixture to form an electrode material
Data Source
AI summary
An electrode material for use with spark plugs and other ignition devices, where the electrode material includes ruthenium (Ru), plus one or more additional constituents like precious metals, refractory metals, active elements, metal oxides, or a combination thereof. In one example, the electrode material is a multi-phase material that has a matrix phase including ruthenium (Ru) and one or more precious metals, refractory metals and/or active elements, and a dispersed phase including a metal oxide. The metal oxide may be provided in particle form or fiber/whisker form, and is dispersed throughout the matrix phase. A powder metallurgy process for forming the electrode material into a spark plug electrode is also provided.