Composite Metallic Thermal Interface Material for Non-Uniform Surfaces

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Solution Overview

Problem

Conventional thermal-interface materials require substantial compressive pressure (often exceeding 20 PSI) to achieve acceptable thermal resistance, and they are not forgiving of non-uniform solid-solid interfaces, leading to inefficiencies in heat transfer across these interfaces.

Innovation Solution

The use of metallic thermal-interface materials with eutectic or non-eutectic compositions, such as Bismuth, Indium, Tin, and Gallium, which can provide thermal resistance below 0.05 °C-cm²/W with pressures between 8 and 18 PSI, and are designed to accommodate non-uniform interfaces by incorporating a phase transition within the expected operating temperatures, enhancing thermal conductivity and reducing thermal resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional thermal-interface materials are used, then thermal resistance can be reduced, but substantial compressive pressure (exceeding 20 PSI) is required

Engineering Contradiction:

Improvethermal resistanceVSAvoidcompressive pressure

Core Design Contradiction:

ReliabilityVSStress or pressure

Solution Approach 1:

The patent changes the material composition parameters by using eutectic or non-eutectic alloys with specific melting points within the operating temperature range. This allows the material to undergo phase transition from solid to liquid and back, fundamentally changing its physical state and properties to achieve low thermal resistance without requiring high compressive pressure

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent directly applies phase transition by designing thermal-interface materials that melt and solidify within the expected operating temperature range. During phase transition, the material maintains intimate contact with both surfaces, ensuring low thermal resistance without needing substantial compressive pressure. The phase change allows the material to adapt to surface irregularities and maintain thermal contact

Inventive Principle:

Principle #36Phase transitions

2Reliability

If conventional thermal-interface materials are used, then thermal resistance can be reduced, but they are not forgiving of non-uniform solid-solid interfaces

Engineering Contradiction:

Improvethermal resistanceVSAvoidinterface uniformity tolerance

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The phase transition capability allows the material to flow and conform to non-uniform interfaces during melting, then solidify to maintain contact. This adaptability enables the material to accommodate surface irregularities, tilts, and non-uniformities while maintaining low thermal resistance, making it forgiving of interface imperfections

Inventive Principle:

Principle #36Phase transitions

Solution Approach 2:

The material transitions from a static solid state to a dynamic liquid state during operation, allowing it to adapt and conform to the interface geometry. This dynamic behavior enables the material to accommodate non-uniform interfaces, then returns to solid state to maintain stable thermal contact, providing both adaptability and reliability

Inventive Principle:

Principle #15Dynamics

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

These materials achieve low thermal-contact resistance across a variety of interfaces, including non-uniform ones, with improved thermal conductivity and reduced pressure requirements, thereby optimizing heat transfer efficiency in electronic components.

Implementation Method 1

partially or wholly undergo phase transition within an expected range of operating temperatures

Methodology Applied

Scientific EffectPhase transition: Phase Change

Implementation Method 2

a heat-transfer fluid changes phase from liquid to gas (or vice-versa) to absorb (or to dissipate, respectively) relatively large amounts of energy over a narrow range of temperatures

Methodology Applied

Scientific EffectLatent heat: Latent Heat

Implementation Method 3

provide a conductive heat-transfer path between the heat-transfer component and the other solid device

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS12453042B2Metallic thermal interface materials and associated devices, systems, and methods

Publication Date: 2025.10.21 DEEIA INC

AI summary

A heat-transfer component defines a thermal-interface surface and has a composite thermal-interface material bonded to the thermal-interface surface. The composite thermal-interface material comprises a particulate filler material dispersed within a metallic carrier material. With a thermal-interface material bonded to the thermal-interface surface, the thermal-contact resistance between the thermal-interface material and the heat-transfer component can be reduced compared to conventional thermal-interface materials, including conventional metallic thermal-interface materials. The particulate filler material can have a higher bulk thermal conductivity than the metallic carrier material and can be wetted by the metallic carrier material, providing a bulk thermal conductivity of the composite thermal-interface material that is higher than that of the carrier material without the particulate filler material. Such materials can relieve thermally induced mechanical stresses across an interface between materials having different coefficients of thermal expansion. Some electrical devices include a heat generating component cooled by such a heat-transfer component.