Solder Composition with Aromatic Activators for Albata Wettability
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Solution Overview
Problem
Current solder compositions face challenges in achieving excellent melting properties and solderability, especially for miniaturized electronic components with small land areas and metals like albata, due to the lack of effective activators, which can lead to corrosion and reduced wettability.
Innovation Solution
A solder composition comprising 5-35% flux composition and 65-95% solder powder, with the flux containing 30-70% rosin-based resin, 1-30% activator, and 20-50% solvent, where the activator includes aromatic carboxylic acids, polymerized aliphatic acids, and nondissociative halogenated compounds, specifically optimized for albata junctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the amount of aliphatic carboxylic acid activator is increased to improve melting property in small area, then the melting property is improved, but wettability to albata metal is significantly decreased
Solution Approach 1:
The patent changes the chemical composition parameters of the activator by introducing aromatic carboxylic acids with specific hydroxyl group positions (ortho, meta, or para) and limiting aliphatic carboxylic acid content to 5 mass% or less. This parameter change resolves the contradiction by achieving both small area melting capability and albata wettability through a different chemical composition approach.
Solution Approach 2:
The patent creates a composite activator system combining multiple components: aromatic carboxylic acids (0.1-10 mass%), polymerized aliphatic acids (0.1-12 mass%), aliphatic dicarboxylic acids (0.1-10 mass%), and nondissociative halogenated compound activators (0.1-10 mass%). This composite approach allows synergistic effects that simultaneously improve melting property and wettability without the trade-off of increasing single component concentrations.
2Manufacturing precision
If the amount of activator such as aliphatic carboxylic acid is increased to improve melting property, then the melting property is improved, but metal corrosion and migration occur due to activator residue
Solution Approach 1:
The patent changes the activator composition parameters by severely limiting aliphatic carboxylic acid content to 5 mass% or less and introducing aromatic carboxylic acids as the primary activator component. This parameter change reduces harmful residues while maintaining melting capability.
Solution Approach 2:
The patent employs activators that effectively perform their function during the soldering process and then decompose or evaporate completely, leaving minimal residue. The aromatic carboxylic acids and halogenated compounds are designed to be consumed during reflow, eliminating the persistence problem of traditional aliphatic carboxylic acid activators.
3Reliability
If an activator particularly advantageous for solderability for albata is used, then solderability for albata is improved, but melting property in small area becomes insufficient
Solution Approach 1:
The patent employs a composite activator system where aromatic carboxylic acids (providing albata wettability), polymerized aliphatic acids (providing melting capability), and halogenated compounds (providing flux action) work synergistically. This composite approach allows each component to contribute its strength without the limitations of single-component activators.
Solution Approach 2:
The patent optimizes the concentration parameters of each activator component within specific ranges: aromatic carboxylic acids (0.1-10 mass%), polymerized aliphatic acids (0.1-12 mass%), and halogenated compounds (0.1-10 mass%). These parameter optimizations enable simultaneous achievement of albata wettability and small area melting without the trade-offs of conventional single-activator approaches.
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 solder composition demonstrates improved melting properties and solderability for small areas and albata, while minimizing corrosion and ensuring reliable joint formation.
Implementation Method 1
an activator to be contained in the flux composition has been studied... an activator includes... aromatic carboxylic acid having a hydroxyl group or an acyl group at an ortho position or a pros position... wettability to metal such as albata
Implementation Method 2
0.1 mass% to 12 mass% of a component (B2) in a form of a polymerized aliphatic acid; 0.1 to 10 mass% of a component (B3) in a form of an aliphatic dicarboxylic acid... solder wet-spreadability
Implementation Method 3
0.1 to 10 mass% of a component (B5) in a form of a nondissociative activator formed of a nondissociative halogenated compound... reliability due to occurrence of metal corrosion
Implementation Method 4
a solder composition that is excellent in a melting property in a small area... melting property... reflow process
Data Source
AI summary
A solder composition of the invention includes: a flux composition containing a component (A) in a form of a rosin-based resin, a component (B) in a form of an activator and a component (C) in a form of a solvent; and a component (D) in a form of a solder powder. The component (B) in a form of the activator contains a component (B1) in a form of an aromatic carboxylic acid having a hydroxyl group or an acyl group at an ortho position or a pros position.