Soft Solder Transfer via Physical Vapor Deposition
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Solution Overview
Problem
Existing methods for applying soft solder to component mounting surfaces struggle with achieving consistent, thin, and pure layers, often resulting in contamination and high costs, especially when dealing with small surfaces.
Innovation Solution
A method involving physical vapor deposition of soft solder onto a carrier layer, which is then brought into mechanical contact with the mounting surface, ensuring a stronger bond between the solder and the surface than between the solder and the carrier, allowing for the carrier's removal and precise application of extremely thin, pure soft solder layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If soft solder is applied by rolling, then soft solder can be produced in bulk, but uniform layer thicknesses of less than 20 μm cannot be achieved and contamination occurs
Solution Approach 1:
A transfer carrier is introduced as an intermediary between the rolling process and the component. The soft solder is first deposited onto the transfer carrier with controlled thickness, then transferred to the component surface. This mediator enables precise thickness control while maintaining bulk production capabilities.
Solution Approach 2:
The traditional direct rolling mechanism is replaced with a two-stage process involving deposition onto a carrier followed by transfer. This substitution allows for better control of layer thickness and reduces contamination by separating the rolling operation from the final application.
2Manufacturing precision
If soft solder is vapor-deposited onto the entire component, then small layer thicknesses combined with high purity are achieved, but the method becomes relatively expensive for small mounting surfaces
Solution Approach 1:
The component surface is segmented into the mounting surface (requiring solder) and the masked area (not requiring solder). The transfer carrier allows selective deposition only on the mounting surface, reducing material waste and processing costs while maintaining high purity and precise thickness control.
Solution Approach 2:
Instead of vapor-depositing solder onto the entire component surface, the transfer method applies solder only to the necessary mounting surface area. This partial action reduces material consumption and processing time, lowering costs while achieving the required precision.
3Ease of operation
If rolled soft solder is used, then soft solder can be applied to mounting surfaces, but the solder is often contaminated and contains rolling grooves
Solution Approach 1:
The transfer carrier serves as a clean intermediary that receives the rolled soft solder and then transfers it to the component. This separates the contamination-prone rolling process from the final application, delivering clean solder without rolling grooves to the mounting surface.
Solution Approach 2:
The harmful elements (contamination and rolling grooves) are extracted from the final solder layer by using the transfer carrier. The carrier absorbs or isolates these defects during the transfer process, leaving only clean, smooth solder on the component surface.
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
Enables the local application of extremely thin and pure soft solder layers with a thickness of less than 10 μm, reducing material waste and costs while maintaining high purity and bond strength, suitable for thermal and electrical connections between components like laser diodes and heat sinks.
Implementation Method 1
a layer of soft solder which is formed on the carrier layer by physical vapor deposition
Implementation Method 2
the layer of soft solder is formed directly by condensation of an appropriate material vapor
Implementation Method 3
the layer of soft solder can be pressed against the mounting surface in the region of the mounting surface (preferably with a greater force than outside the mounting surface) in order to achieve the first bond strength
Data Source
AI summary
The invention relates to a method for applying soft solder to a mounting surface of a component, wherein a connecting means comprising a carrier layer and a soft solder layer formed by physical vapor deposition on the carrier layer is brought into mechanical contact between the soft solder layer and the mounting surface, such that a first bond strength between the soft solder layer and the mounting surface is greater than a second bond strength between the soft solder layer and the carrier layer. The connecting means is subsequently removed from the component so that the carrier layer releases from the soft solder layer in the area of the mounting surface and thus soft solder remains only at the mounting surface.