Thermally Conductive Grease Composition for High Conductivity and Coatability

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Solution Overview

Problem

Existing thermally conductive grease compositions face challenges in achieving high thermal conductivity while maintaining good coatability due to the increased viscosity caused by high filling of thermally conductive fillers, particularly those with high thermal conductivity like aluminum nitride, which can lead to difficulties in thin film application and thermal resistance.

Innovation Solution

A thermally conductive grease composition comprising a base oil and a combination of zinc oxide and aluminum nitride as fillers, with specific particle size ranges and ratios, along with a dispersant, to enhance both thermal conductivity and coatability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If high filling of thermally conductive filler is used to improve thermal conductivity, then thermal conductivity is improved, but viscosity increases and coatability deteriorates

Engineering Contradiction:

Improvethermal conductivityVSAvoidcoatability

Core Design Contradiction:

TemperatureVSEase of operation

Solution Approach 1:

The patent changes the particle size parameters of the filler (using fine particles of 0.1-2 μm) and the base oil viscosity parameters to achieve optimal balance between thermal conductivity and coatability. By controlling filler particle size and base oil properties, the composition achieves high thermal conductivity without excessive viscosity increase

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining specific filler particles (zinc oxide, aluminum nitride) with base oils (polyalphaolefin, organic acid ester) and surface modifiers. This composite approach allows synergistic effects where the combination of materials achieves both high thermal conductivity and good coatability that individual materials cannot provide alone

Inventive Principle:

Principle #40Composite materials

2Temperature

If filler with high thermal conductivity like aluminum nitride is used, then thermal conductivity is improved, but compatibility with resin component decreases and viscosity increases

Engineering Contradiction:

Improvethermal conductivityVSAvoidcompatibility

Core Design Contradiction:

TemperatureVSStability of the object's composition

Solution Approach 1:

The patent introduces surface modifiers as intermediary substances that coat the filler particles and improve their compatibility with the base oil and resin components. These surface modifiers act as mediators between the high thermal conductivity filler and the matrix materials, reducing interfacial incompatibility and preventing excessive viscosity increase

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent adjusts the surface properties of the filler particles through surface treatment and controls the surface modifier concentration (0.01-5 wt%) to optimize compatibility. By changing surface parameters and controlling composition ratios, the system maintains stability while achieving high thermal conductivity

Inventive Principle:

Principle #35Parameter changes

3Temperature

If high filling of thermally conductive filler is used to achieve high thermal conductivity, then thermal conductivity is improved, but thin film application becomes difficult

Engineering Contradiction:

Improvethermal conductivityVSAvoidthin film application

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

The patent optimizes the base oil viscosity parameters and filler particle size to enable proper thin film formation. By controlling the flow characteristics and surface properties, the composition can be applied as a thin uniform film even with high filler loading, achieving both high thermal conductivity and proper application characteristics

Inventive Principle:

Principle #35Parameter changes

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 composition achieves high thermal conductivity of 4.0 W/(m·K) or more and excellent coatability with a shear viscosity of 1000 Pa·s or less, suitable for applications between heat generators and radiators.

Implementation Method 1

a thermally conductive grease composition is applied between a heat generating component such as a semiconductor component and a heat dissipation component so as to bring the components into close contact with each other, and is used for enhancing heat conduction

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)