Thick Film Paste Metallization for High Temperature Gas Sensors
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Solution Overview
Problem
Existing thick film pastes for sensor devices, particularly high temperature gas sensors, face issues with surface defects, weldability, and service life due to poor topography and material properties of metallizations.
Innovation Solution
A thick film paste comprising particulate platinum alloy, specific metal compounds like NiO, RuO2, and TiO2, and an organic vehicle, which improves metallization properties by reducing defects and enhancing weldability and service life through a pyrolysis process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional thick film paste is used for metallization, then the production process is simple, but the metallization exhibits surface defects and poor topography
Solution Approach 1:
The patent applies composite materials by combining particulate platinum alloy with specific metal oxides (NiO, RuO2, TiO2, etc.) and organic vehicle to create a thick film paste that produces metallization with improved topography and reduced surface defects. The composite composition enables better flow and filling properties during firing, resolving the contradiction between manufacturing precision and device complexity.
Solution Approach 2:
The patent changes the chemical composition parameters of the thick film paste by incorporating specific metal compounds that form metal oxides during firing. This parameter change in the paste formulation improves the metallization topography and reduces surface defects while maintaining a manageable paste composition structure.
2Ease of operation
If conventional metallization material is used, then the material composition is simple, but the weldability is poor
Solution Approach 1:
The patent uses composite materials comprising particulate platinum alloy combined with specific metal oxides (NiO, RuO2, TiO2, and others) in defined proportions. This composite structure enhances the weldability of the metallization by improving its physical and chemical properties, while the metal compound content is controlled to achieve the desired weldability without excessive complexity.
3Duration of action of stationary object
If conventional thick film paste is used, then the production cost is low, but the service life is reduced
Solution Approach 1:
The patent employs composite materials with particulate platinum alloy and specific metal oxides (NiO, RuO2, TiO2, etc.) that enhance the durability and service life of the metallization. The controlled inclusion of metal compounds improves the structural integrity and resistance to degradation at high temperatures, extending service life while maintaining cost-effectiveness through optimized composition.
Solution Approach 2:
The patent modifies the chemical composition parameters by incorporating specific metal compounds that form stable metal oxides during firing. This parameter change in the paste formulation enhances the service life of the metallization by improving its thermal stability and resistance to degradation, while the metal compound content is optimized to balance performance and cost.
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 paste produces metallizations with improved smoothness, reduced defects, enhanced weldability, and extended service life, making it suitable for high temperature gas sensors.
Implementation Method 1
U.S. Pat. No. 6,165,247 discloses a pyrolysis method for the production of platinum metal, platinum alloy or platinum composite particles
Implementation Method 2
the at least one metal compound is selected from the group consisting of in each case particulate NiO, SiO2, RuO2, Rh2O3, IrO2, Cu2O, CuO, TiO2, ZrO2, PbO, SnO2, CeO2, Al2O3, MgO, MnO2 and MoO2, and metal compounds capable of forming a metal oxide on firing
Data Source
AI summary
A thick film paste comprising at least one particulate platinum (alloy), at least one metal compound, and an organic vehicle, wherein the at least one metal compound is selected from the group consisting of in each case particulate NiO, SiO2, RuO2, Rh2O3, IrO2, Cu2O, CuO, TiO2, ZrO2, PbO, SnO2, CeO2, Al2O3, MgO, MnO2 and MoO2, and metal compounds capable of forming a metal oxide on firing, the metal oxide being selected from the group consisting of NiO, SiO2, RuO2, Rh2O3, IrO2, Cu2O, CuO, TiO2, ZrO2, PbO, SnO2, CeO2, Al2O3, MgO, MnO2 and MoO2.