SACO Blasting for Solder Joint Adhesion and Positioning
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Solution Overview
Problem
Existing methods for producing soldered connections between base parts and components face issues with insufficient adhesion of thermosetting plastics under mechanical stresses and risk of component blurring during soldering, leading to inhomogeneous heat spread and positioning errors.
Innovation Solution
A SACO blasting process is applied to a base part to create a non-wettable area for solder, preventing blurring and ensuring improved adhesion of thermosetting plastics, while the SACO-blasted area acts as a solder stop, enhancing mechanical stress absorption and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the base part surface is roughened to improve adhesion of thermosetting plastics, then adhesion is improved, but the component positioning precision deteriorates due to blurred edges
Solution Approach 1:
The patent applies selective surface treatment where only specific areas of the base part are roughened with SACO blasting. The positioning areas remain smooth and unblasted to maintain precise component positioning, while other areas are blasted to improve plastic adhesion. This local differentiation resolves the contradiction by applying surface treatment only where adhesion is needed, not where positioning precision is critical.
2Strength
If complete surface blasting is performed to maximize adhesion improvement, then adhesion is significantly improved, but soldering quality deteriorates due to solder wettability loss on entire surface
Solution Approach 1:
The patent creates distinct zones on the base part surface: positioning areas remain smooth and unblasted to maintain solder wettability, while other areas undergo SACO blasting to improve plastic adhesion. The blasted areas also serve as solder stops due to their non-wettable surface properties. This selective approach resolves the contradiction by localizing the surface treatment effect.
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 achieves improved adhesion and mechanical stress absorption, preventing blurring and inhomogeneous heat spread, ensuring precise component positioning and enhanced durability of electronic assemblies.
Implementation Method 1
a SACO blasting process (SAndblast COating, for example from Delo) is carried out on a provided base part with only partial blasting of a surface of the base part with a SACO blasting medium
Implementation Method 2
Due to the silicate residues of the SACO blasting material remaining on the blasted area of the base part, a significantly improved adhesion of housing materials, in particular thermosetting plastics, on the blasted area is achieved
Implementation Method 3
improved absorption of mechanical stresses in the base part, which are caused by different thermal expansion coefficients of the components
Implementation Method 4
improved absorption of mechanical stresses in the base part, which are caused by different thermal expansion coefficients of the components
Data Source
Figure 1
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AI summary
The invention relates to a method for producing a solder joint between at least one base part (2) and at least one first component (3), comprising the following steps: providing the base part (2); partially blasting a surface of the base part (2) using a SACO blasting agent, the blasting material (50) of which has a silicate coating (52), in such a way that a SACO-blasted region (20) and a non-blasted positioning region (40) are present; and soldering the at least first component (3) onto the non-blasted positioning region (40), wherein the SACO-blasted region (20) acts as a solder resist.