Silver Paste for Aluminium Surfaces
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Solution Overview
Problem
Existing methods for silvering aluminum surfaces, such as galvanic processes and sintering with silver-gold nano-particle compositions, are costly, time-consuming, and unsuitable for high-temperature surfaces due to high sintering requirements and the need for intermediate layers, and they pose environmental and health risks.
Innovation Solution
A method using a paste composed of 80-85% nano-particles of silver and 15-20% organic carrier based on methyl polymethacrylate, applied via screen printing and sintered at temperatures between 200°C and 400°C, eliminating the need for intermediate layers and gold nano-particles, allowing for high-temperature stability and efficient coating of large surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If galvanic methods are used for silvering aluminium surfaces, then silver deposition can be achieved, but the process becomes expensive and time-consuming requiring intermediate layers
Solution Approach 1:
The patent removes intermediate layers from the galvanic silvering process by treating the aluminium surface with a chemical solution that eliminates the need for copper or nickel intermediate layers, directly enabling silver deposition on aluminium without additional complex steps
Solution Approach 2:
The patent modifies the chemical parameters of the silvering bath by using specific silver salt concentrations and pH levels that enable direct deposition on aluminium without intermediate layers, changing the process conditions to achieve simpler direct silvering
2Reliability
If intermediate layers are used to prevent passivation of aluminium, then silver deposition is improved, but costs and process time increase
Solution Approach 1:
The patent extracts and eliminates the intermediate layer step from the traditional multi-layer process, using a modified chemical treatment that allows direct silver deposition on aluminium, reducing both time and complexity
Solution Approach 2:
The patent applies a preliminary chemical treatment to the aluminium surface that prepares it for direct silver deposition, creating surface conditions that prevent passivation during the silvering process without requiring intermediate layers
3Reliability
If sintering is performed at high temperatures to obtain continuous silver layer, then conductivity is improved, but aluminium surface integrity is compromised
Solution Approach 1:
The patent changes the sintering temperature parameter from traditional high temperatures (600-850°C) to lower temperatures (200-450°C), achieving adequate conductivity while preserving the integrity of temperature-sensitive substrates like aluminium, plastics, and fabric
Solution Approach 2:
The patent uses a composite paste formulation containing silver particles, organic vehicle, and binders that enables effective sintering at lower temperatures, creating a continuous conductive network without requiring temperatures that would damage the substrate
4Stability of the object's composition
If traditional silver paste with glaze is used, then continuous layer formation is achieved, but high-temperature stability is reduced
Solution Approach 1:
The patent removes glaze from the silver paste formulation, eliminating the component that causes instability above 200°C, and uses alternative binders and particle arrangements that achieve layer continuity without temperature-sensitive additives
Solution Approach 2:
The patent develops a new composite paste formulation without glaze, using silver particles with specific size distributions and alternative organic vehicles that maintain layer continuity and stability at temperatures up to 450°C and above
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 method provides a cost-effective, fast, and environmentally friendly silvering process that maintains surface integrity and enables high-temperature operation without intermediate layers, suitable for aluminum and other sensitive surfaces, with silver layers maintaining conductivity up to 450°C under load.
Implementation Method 1
sintered at temperatures between 200°C and 400°C
Implementation Method 2
paste composed of 80-85% nano-particles of silver and 15-20% organic carrier based on methyl polymethacrylate
Data Source
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Figure 2
AI summary
The invention relates to a method of silvering surfaces, characterized in that it includes a stage of applying onto said surface a paste consisting of 80-85% by weight of nano-particles of silver and 15-20% by weight of organic carrier based on methyl polymethacrylate. Particularly preferably, said surface is an aluminium surface.