Selective Tin Layer Remelting for Intermetallic Phase Control
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Solution Overview
Problem
Existing methods for producing metal workpieces with a tin layer are complex and costly due to the need for multiple galvanic baths and heating steps, leading to inefficiencies in the remelting process.
Innovation Solution
A method involving galvanic application of a tin-containing layer to predetermined sections of a workpiece, followed by heating to a first temperature that prevents remelting, and then local heating to a higher temperature to selectively remelt the tin layer, forming intermetallic phases, while maintaining a homogeneous layer thickness and geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple galvanic baths and heating steps are used to produce metal workpieces with tin layer, then the remelting process can be achieved, but the process becomes complex and costly
Solution Approach 1:
The patent combines multiple coating steps into a single galvanic coating step where tin is applied to predetermined first sections in one continuous process. This eliminates the need for separate coating operations and multiple baths, directly reducing process complexity while maintaining the required remelting quality through integrated process design.
Solution Approach 2:
The workpiece is divided into predetermined first sections that receive tin coating during the galvanic process. This segmentation allows selective coating of specific areas that will later require remelting, enabling complex geometries and selective property distribution without requiring multiple full-coating operations.
2Reliability
If multiple galvanic baths and tools are used in continuous process, then complete coating can be achieved, but the cost increases
Solution Approach 1:
The patent merges multiple coating operations into a single galvanic coating step that applies tin to predetermined sections in one continuous process. This consolidation reduces the number of baths and tools required, directly lowering equipment investment and operational costs while maintaining complete coating coverage through proper process design.
Solution Approach 2:
The single galvanic coating system performs multiple functions: it coats all predetermined first sections that will require remelting in one operation. This multi-functional approach eliminates the need for separate coating lines and reduces overall manufacturing complexity and cost.
3Reliability
If uniform heating is applied to remelt tin layer, then complete remelting can be achieved, but selective remelting of specific sections cannot be controlled
Solution Approach 1:
The patent applies local quality by heating only predetermined second sections (which are subsets of the coated first sections) to the remelting temperature T2, while other coated sections remain at lower temperature T1. This selective local heating achieves precise control over which areas undergo remelting, creating different intermetallic phase distributions in different sections of the same workpiece.
Solution Approach 2:
The patent uses parameter changes by applying two distinct temperature levels: a first temperature T1 (below remelting point) for general heating and a second temperature T2 (at or above remelting point) for selective remelting. This temperature parameter differentiation enables precise control over the remelting process, achieving both completeness in targeted areas and selectivity across the workpiece.
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
This approach simplifies the process, reduces costs by using a single electrolytic coating system, and achieves a workpiece with both remelted and non-remelted tin layers, enhancing the properties of the workpiece without unwanted phase formation.
Implementation Method 1
a) Galvanic application of the tin-containing layer to predetermined first sections of the workpiece
Implementation Method 2
b) heating the workpiece to a first temperature T1 between 100° C. and 230° C. such that the layer does not yet remelt
Implementation Method 3
c) local heating a second section contained in the first sections to a second temperature T2 between 227°C and 380°C, so that the tin-containing layer is remelted only in the second section
Implementation Method 4
Intermetallic phases are formed as a result of the remelting
Data Source
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AI summary
The invention relates to a method for producing a workpiece (1) made of metal with a tin-containing layer (6) applied thereon and remelted in sections, comprising the following steps: a) electroplating the tin-containing layer (4) onto predetermined first sections (2) of the workpiece, followed by b) heating the workpiece (1) to a first temperature T1 between 100°C and 230°C, and followed by c) locally heating a second section (5) contained in the first sections (2) to a second temperature T2 between 227°C and 380°C, so that the tin-containing layer (4) is remelted exclusively in the second section (5).