Liquid Alloy Thermal Paste to Prevent Overflow and Short-Circuits
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Solution Overview
Problem
Conventional thermal interface materials (TIMs) face challenges in high-power electronic devices due to poor contact interface, low thermal conductivity, and reliability issues such as pump-out and short-circuits, especially in high-temperature reflow processes during semiconductor packaging.
Innovation Solution
A liquid alloy thermal paste is developed by alloying gallium, indium, and tin with trace elements and thermal conductive particles, forming a viscous and paste-like mixture with excellent adhesion and high thermal conductivity, which can withstand high temperatures and prevent overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid metal is used as thermal interface material, then thermal conductivity is improved, but it is prone to overflow and short-circuits due to liquid form and high surface tension
Solution Approach 1:
The patent changes the physical state parameter of the thermal interface material from liquid to solid by using eutectic gallium-indium-tin alloy that remains solid at operating temperatures but exhibits liquid-like thermal conductivity through its unique microstructure and trace element additions
Solution Approach 2:
The patent creates a composite material system combining gallium, indium, and tin metals with trace elements (such as bismuth, cadmium, or zinc) to form a eutectic alloy with optimized properties that prevent overflow while maintaining high thermal conductivity
2Ease of operation
If conventional thermal greases are used, then ease of operation is improved, but thermal conductivity is insufficient and pump-out problem occurs
Solution Approach 1:
The patent develops a composite eutectic alloy system combining multiple metals (gallium, indium, tin) with trace elements to achieve both high thermal conductivity and reliability, eliminating the pump-out problem inherent in conventional grease-based materials
Solution Approach 2:
The patent changes the material composition from organic grease-based compounds to inorganic eutectic alloy, fundamentally altering thermal conductivity parameters and eliminating degradation issues while maintaining ease of application
3Reliability
If solid thermal pads are used, then thermal conductivity is improved, but interface contact is poor due to rigidity
Solution Approach 1:
The patent changes the mechanical property parameters of the thermal interface material by creating a eutectic alloy with optimized composition that provides both thermal conductivity and mechanical compliance, allowing conformal contact while maintaining high thermal performance
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 liquid alloy thermal paste provides stable, efficient thermal conduction with low thermal resistance, preventing short-circuits and maintaining form under high temperatures, suitable for advanced semiconductor packaging applications.
Implementation Method 1
The liquid alloy thermal paste provides stable, efficient thermal conduction with low thermal resistance
Implementation Method 2
a viscous and paste-like liquid alloy mixture is obtained as the liquid alloy thermal paste... maintaining form under high temperatures
Data Source
AI summary
A liquid alloy thermal paste comprises: a liquid alloy and a trace element, the liquid alloy and the trace element are stirred and reformed to a paste-like liquid alloy mixture that is viscous and does not flow easily, and the liquid alloy mixture is used as the liquid alloy thermal paste.