Hybrid Thermal Interface Materials to Mitigate Grease Pump-Out

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Solution Overview

Problem

Thermal interface materials tend to pump out due to pressure and temperature changes, leading to reduced thermal conductivity and increased component temperatures in information handling systems.

Innovation Solution

A hybrid combination of thermal interface materials, comprising an inner thermal interface material surrounded by an outer thermal interface material, forms a barrier to prevent the inner material from being squeezed out, maintaining effective thermal conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a single thermal interface material is used to fill gaps between components, then thermal conductivity is improved, but the material pumps out due to pressure and temperature changes

Engineering Contradiction:

Improvecomponent temperatureVSAvoidthermal interface material stability

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The thermal interface material system is segmented into an inner material (first thermal interface material) and an outer material (second thermal interface material). The inner material provides superior thermal conductivity at the critical heat transfer interface, while the outer material provides structural support and prevents pump-out. This segmentation allows each material to be optimized for its specific function, resolving the contradiction between thermal performance and stability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs a composite structure combining two different thermal interface materials with complementary properties. The first material (e.g., liquid metal) offers high thermal conductivity, while the second material (e.g., thermal pad or grease) offers higher viscosity and structural integrity. Together, they form a composite system that achieves both excellent thermal transfer and resistance to pump-out under pressure and temperature cycling.

Inventive Principle:

Principle #40Composite materials

2Loss of energy

If high thermal conductivity material is used, then heat transfer efficiency is improved, but the material is more prone to pumping out under pressure

Engineering Contradiction:

Improvethermal energy lossVSAvoidthermal interface material position

Core Design Contradiction:

Loss of energyVSStability of the object's composition

Solution Approach 1:

Different regions of the thermal interface are assigned different material qualities. The central region (inner material) prioritizes thermal conductivity for efficient heat transfer, while the peripheral region (outer material) prioritizes viscosity and structural stability to prevent pump-out. This local differentiation of material properties allows the system to optimize for thermal performance where needed while maintaining stability at the boundaries.

Inventive Principle:

Principle #3Local quality

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

Prevents thermal interface material from pumping out, ensuring consistent thermal conductivity and reducing temperature increases in thermal conducting components.

Implementation Method 1

a first thermal interface material that is deposited on a surface of the processor die

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

A second thermal interface material is deposited on the surface of the processor die around a periphery of the first thermal interface material and encloses the first thermal interface material

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Data Source

PatentUS20250336756A1Hybrid combination of thermal interface materials to mitigate thermal grease pump-out

Publication Date: 2025.10.30 DELL PROD LP

AI summary

An information handling system includes a processor package having a processor die and a first thermal interface material that is deposited on a surface of the processor die. A second thermal interface material is deposited on the surface of the processor die around a periphery of the first thermal interface material and encloses the first thermal interface material.