Pressure Applying Unit for Metal Paste Bonding
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Solution Overview
Problem
Conventional methods for manufacturing bonded bodies using metal particle pastes often result in incomplete sintering due to unintended heat conduction from heating parts, leading to reduced bonding strength and productivity.
Innovation Solution
A pressure applying unit with transferring members, guide members, and a distance adjusting mechanism that minimizes heat conduction to the metal particle paste by maintaining parallelism and adjusting distance between transferring members during pressure application, preventing partial sintering reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If heat is transferred to the metal particle paste from the heating part before pressure application, then the heating process can be started earlier, but a sintering reaction occurs in the metal particle paste causing insufficient density and strength
Solution Approach 1:
The patent introduces transferring members as intermediary components between the heating parts and the metal particle paste. These transferring members receive heat from the heating parts and then transfer it to the metal particle paste after pressure application, preventing direct heat conduction that would cause premature sintering. This mediator approach allows decoupling of the heating start time from the sintering process.
Solution Approach 2:
The patent applies pressure to the metal particle paste before transferring heat through the transferring members. By performing the pressure application in advance (preliminary action), the metal particles are compacted into a dense structure that can then be uniformly heated without causing localized premature sintering, ensuring sufficient density and strength.
2Reliability
If the heating parts are cooled before arranging the assembled body and heated after pressure application, then partial sintering is suppressed, but productivity is remarkably lowered
Solution Approach 1:
The transferring members serve as thermal intermediaries that remain at elevated temperatures without directly contacting the metal particle paste before pressure application. This allows the heating parts to maintain high temperatures continuously (improving productivity) while the transferring members control the timing of heat transfer to the paste (ensuring reliability by preventing premature sintering).
Solution Approach 2:
The patent employs a dynamic system where the transferring members are positioned to contact the metal particle paste only after pressure application. The system transitions from a static heating approach to a dynamic controlled heat transfer process, allowing continuous heating of the transferring members while controlling when heat reaches the paste, thus maintaining both productivity and bonding quality.
3Use of energy by moving object
If direct heating of the metal particle paste is applied, then heating efficiency is improved, but unintended heat conduction causes incomplete sintering
Solution Approach 1:
The transferring members act as controlled thermal intermediaries that improve manufacturing precision by mediating heat transfer. They receive heat efficiently from the heating parts and transfer it uniformly to the metal particle paste after pressure application, ensuring uniform sintering throughout the paste while maintaining high heating efficiency through the intermediary heat transfer path.
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 solution effectively suppresses partial sintering reactions, maintaining bonding strength and productivity by controlling heat transfer and ensuring consistent pressure application, thus enhancing the bonding properties between substrates and electronic parts.
Implementation Method 1
heat is transferred to the metal particle paste 4 from the heating part 1000
Implementation Method 2
a pressure can be applied to an object sandwiched between the pair of heating parts 1000, 1002
Implementation Method 3
a sintering reaction (solidifying reaction) occurs in a portion of the metal particle paste 4
Data Source
AI summary
Provided is a pressure applying unit used in baking a metal particle paste of an assembled body formed by arranging an electronic part on a substrate with the metal particle paste interposed therebetween by heating the assembled body while applying pressure to the assembled body using a pair of heating parts. The pressure applying unit includes: a pair of transferring members which transfers pressure and heat to the assembled body by sandwiching the assembled body therebetween; guide members which movably connect the pair of transferring members to each other; and a distance adjusting mechanism being configured to make the second transferring member separated from the assembled body during a pressure non-applying time and brings both the first transferring member and the second transferring member into contact with the assembled body during a pressure applying time.