Pt Core Ceramic Shell Conductive Particle Low Resistance
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Solution Overview
Problem
Conventional metal pastes for electrode formation result in high resistance values due to the sintering of ceramic particles, which affects the adhesion and conductivity of electrode films, as ceramic particles are coarsened during calcination, leading to warpage and deformation issues.
Innovation Solution
A conductive particle with a core/shell structure, where a Pt or Pt alloy core is covered with a ceramic shell (Al2O3 or ZrO2) to maintain uniform dispersion and prevent premature sintering, reducing the resistance of the electrode film by ensuring the ceramic shell detaches before the core sintering, thus maintaining a fine ceramic particle size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ceramic powder is mixed in metal paste to improve adhesion and reduce warpage, then adhesion of electrode is improved, but resistance value of electrode film becomes significantly higher
Solution Approach 1:
The conductive particle is segmented into core and shell portions, with the ceramic shell covering the conductive core. This segmentation allows the ceramic to provide adhesion benefits while the conductive core maintains low resistance, resolving the contradiction between improved adhesion and excessive resistance.
Solution Approach 2:
The invention uses composite conductive particles consisting of a conductive metal core and a ceramic shell. This composite structure combines the adhesive properties of ceramic with the conductive properties of metal, simultaneously achieving both improved adhesion and low resistance.
2Manufacturing precision
If ceramic powder is mixed in metal paste to prevent excessive sintering of conductive particle, then sintering control is improved, but coarse ceramic particles form during calcining causing high resistance
Solution Approach 1:
The ceramic shell is pre-formed around the conductive core before calcining, establishing a controlled structure that prevents uncontrolled sintering and ceramic aggregation during the heating process. This preliminary structuring ensures fine ceramic particles remain dispersed rather than coarsening.
Solution Approach 2:
The invention changes the physical state and distribution parameters of ceramic by forming it as a thin shell around conductive cores rather than as separate powder particles. This parameter change prevents ceramic coagulation and maintains fine particle size distribution during sintering, avoiding resistance increase.
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 core/shell structure reduces the resistance of the electrode film by 20-40% compared to conventional methods, allowing for thinner electrodes with reduced precious metal usage and improved adhesion, while maintaining the ceramic's bonding properties.
Implementation Method 1
the conductive particle is sintered and bound, and thus allowed to be conductive as an electrode
Implementation Method 2
the ceramic shell detaches before the core sintering, thus maintaining a fine ceramic particle size
Data Source
AI summary
An object of the present invention is to provide a conductive fine particle for producing a metal paste that can produce an electrode film having a low resistance, and a metal paste utilizing the conductive fine particle. The present invention is a conductive particle for electrode formation having a core/shell structure, and the conductive particle comprises a core particle made of Pt or a Pt alloy and having a particle diameter of 10 to 200 nm, and a shell made of a ceramic containing Al2O3 or ZrO2 and covers at least a part of the core particle, wherein the ceramic constituting the shell is added in an amount of 0.5 to 15% by weight based on the core particle to cover the core. The core particle is preferably Pt or a Pt alloy alloyed with Pd, Au, Ag, or Rh.