Low-Melting-Point Alloy Composite for Thermal Interface Resistance
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Solution Overview
Problem
Conventional thermal interface materials (TIMs) fail to achieve perfect contact between electronic components due to voids and poor thermal conductivity, leading to inefficient heat dissipation, especially as electronic components generate more heat with increasing performance.
Innovation Solution
A low-melting-point alloy composite material comprising 48-54 wt.% In, 30-36 wt.% Bi, 14-21 wt.% Sn, and additives like carbon and BN, which forms an intermetallic compound layer with metals to enhance thermal conductivity and fill gaps between components, reducing interface thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermal interface materials are used to fill gaps between components, then some heat transfer improvement is achieved, but the thermal conductivity is insufficient and voids remain, leading to poor contact and high interface thermal resistance
Solution Approach 1:
The patent changes the physical state parameter of the thermal interface material by using a low-melting-point alloy that transitions from solid to liquid at operating temperatures. This phase change enables the material to flow into and completely fill gaps and voids between contact surfaces, eliminating air pockets and achieving perfect thermal contact, thereby dramatically reducing interface thermal resistance while improving heat transfer efficiency
Solution Approach 2:
The patent employs a composite material system consisting of a low-melting-point alloy base (In-Sn-Bi system) combined with thermally conductive fillers. This composite structure combines the fluidity and gap-filling capability of the low-melting-point alloy with the high thermal conductivity of the filler particles, achieving both complete contact and efficient heat transfer while minimizing interface thermal resistance
2Ease of operation
If the thermal interface material needs to fill gaps between contact surfaces, then sufficient fluidity and deformation ability are required, but this may compromise the structural stability and thermal conductivity
Solution Approach 1:
The patent utilizes the temperature-dependent parameter change of the low-melting-point alloy, which remains liquid at operating temperatures (melting point 50-70°C). This liquid state provides excellent fluidity for gap filling, while the suspended thermally conductive fillers maintain high thermal conductivity. The material transforms from a solid at room temperature to a liquid at operating temperature, optimizing both fluidity and thermal conductivity for their respective functional requirements
Solution Approach 2:
The composite structure combines a low-viscosity low-melting-point alloy matrix with high-aspect-ratio thermally conductive filler particles. The matrix provides fluidity and deformation ability for gap filling, while the fillers form a continuous thermal conduction network that maintains high thermal conductivity even in the liquid state, resolving the contradiction between fluidity and thermal conductivity
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 composite material significantly improves thermal conductivity and viscosity, enabling effective heat dissipation and reducing interface thermal resistance, outperforming commercial TIMs in heat transfer efficiency.
Implementation Method 1
a low-melting-point alloy composite material... significantly improves thermal conductivity... outperforming commercial TIMs in heat transfer efficiency
Implementation Method 2
low-melting-point alloy composite material... sufficient fluidity and deformation ability to fill the gaps fully
Data Source
AI summary
A low-melting-point alloy composite material and a composite material structure are provided. The low-melting-point alloy composite material includes 48 to 54 wt. % In, 30 to 36 wt. % Bi, 14 to 21 wt. % Sn, and at least one selected from 0.1 to 0.3 wt. % carbon material and 0.05 to 0.1 wt. % boron nitride (BN). The composite material structure includes a metal layer, a low-melting-point alloy composite material layer, and an interface material layer, wherein the material of the low-melting-point alloy composite material layer is the above low-melting-point alloy composite material, and the interface material layer is formed between the metal layer and the low-melting-point alloy composite material layers.