Metal Particle Composition Using Oxygen Absorbers Against Oxidation
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Solution Overview
Problem
Existing methods for miniaturizing metal particles fail to adequately prevent oxidation, leading to decreased thermal conductivity and increased electrical resistance, and are often complex or require transition metal catalysts, making them unsuitable for existing metal particles.
Innovation Solution
A metal particle composition is developed using a compound with a specific structure containing an unsaturated double bond, which is mixed with metal particles to enhance oxidation resistance without requiring a transition metal catalyst, allowing for application to existing metal particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If metal particles are miniaturized to reduce melting point and enable application to low heat resistance base materials, then sintering temperature is reduced and applicability to low heat resistance base materials is improved, but specific surface area increases leading to oxidation and decreased thermal conductivity
Solution Approach 1:
An oxygen absorber is introduced as an intermediary substance that selectively absorbs oxygen in the vicinity of metal particles. This mediator prevents oxygen from reaching and oxidizing the metal particle surfaces, thereby protecting the thermal conductivity of miniaturized metal particles without requiring transition metal catalysts or complex production processes.
2Object-affected harmful factors
If conventional oxygen absorbers containing transition metal catalysts are used to prevent oxidation, then oxidation resistance is improved, but heterogeneous metals are introduced making the oxygen absorber difficult to apply to existing metal particles
Solution Approach 1:
The invention uses a simple organic compound (ethylene glycol) as a disposable oxygen absorber that does not require transition metal catalysts. This short-living organic substance absorbs oxygen through oxidation and decomposes into harmless products, avoiding the introduction of heterogeneous metals and enabling direct application to existing metal particles without complex production processes.
3Object-affected harmful factors
If covering layers are formed during granulation to prevent oxidation, then oxidation resistance is improved, but production process complexity increases and existing metal particles cannot be covered
Solution Approach 1:
Instead of forming covering layers during granulation, the invention performs preliminary action by adding an oxygen absorber to the metal particle composition before sintering. This preliminary addition of oxygen absorber protects existing metal particles from oxidation without requiring modification of the granulation process or formation of complex covering layers.
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 composition effectively prevents oxidation of metal particles, maintaining thermal conductivity and electrical performance even at smaller sizes, and can be easily produced for use in various applications.
Implementation Method 1
a compound having a specific structure containing an unsaturated double bond together with metal particles... effectively prevents oxidation of metal particles
Data Source
AI summary
To provide a metal particle composition having excellent oxidation resistance, which does not require a transition metal catalyst and can be applied to existing metal particles, a method for producing the metal particle composition, and a paste. The metal particle composition contains, with respect to 100 parts by mass of metal particles, 0.1 to 5 parts by mass of a compound (A) having a structure represented by the following general formula (I): in which R1 and R2 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group, or an aralkyl group, R3 and R4 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group, an alkenyl group having 2 to 6 carbon atoms, an alkenyloxy group, an aryl group, or an aralkyl group.