Thermally Conductive Grease Composition for Pump-Out Suppression
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Solution Overview
Problem
Existing thermally conductive grease compositions face challenges in achieving high thermal conductivity while maintaining coatability and preventing the pump-out phenomenon, particularly when using high thermal conductivity fillers like aluminum nitride, which can increase viscosity and reduce applicability, leading to potential component malfunction.
Innovation Solution
A thermally conductive grease composition comprising zinc oxide, aluminum nitride, and calcium carbonate particles, with specific particle size ranges and ratios, along with a polyalphaolefin and organic acid ester base oil, enhances thermal conductivity and coatability while suppressing the pump-out phenomenon.
Engineering Contradictions & Design Principles
Engineering 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
Solution Approach 1:
The patent applies parameter changes by carefully controlling the particle size distribution (D10, D50, D90 values) and size ratio between different filler particles. This optimization allows achieving high thermal conductivity while maintaining acceptable viscosity and coatability through precise parameter adjustment rather than simply increasing filler content
Solution Approach 2:
The patent uses composite materials by combining multiple types of thermally conductive fillers (metal powder, metal oxide, metal nitride) with different thermal conductivities and particle size characteristics. This composite approach enables achieving high overall thermal conductivity while the diversity in particle properties helps maintain better flow and coating characteristics
2Temperature
If filler having high thermal conductivity is used to improve thermal conductivity, then thermal conductivity is improved, but compatibility with resin component deteriorates and viscosity increases
Solution Approach 1:
The patent employs composite materials by selecting a combination of fillers with different chemical natures (metal, metal oxide, metal nitride) and surface properties. This diversity in composition improves compatibility with the resin matrix while maintaining high thermal conductivity through the synergistic effect of different filler types
Solution Approach 2:
The patent applies local quality by using fillers with varied surface characteristics and chemical compositions throughout the grease matrix. Different filler types provide localized compatibility improvements with the resin component, preventing aggregation and maintaining stable composition throughout the material
3Reliability
If silicone-based polymer compound is blended to suppress pump-out phenomenon, then pump-out phenomenon is suppressed, but viscosity increases and high filling of thermally conductive filler is hindered
Solution Approach 1:
The patent applies parameter changes by optimizing the molecular weight, structure, and content of the polymer compound used to suppress pump-out. By carefully adjusting these parameters, the patent achieves reliable pump-out suppression while minimizing the viscosity increase that would otherwise limit thermally conductive filler content
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, excellent coatability, and effectively prevents the pump-out phenomenon, ensuring stable heat dissipation in electronic components.
Implementation Method 1
A thermally conductive grease composition, including a base oil, a thermally conductive filler containing zinc oxide and aluminum nitride
Implementation Method 2
the thermally conductive grease composition may also shift (i.e., the pump-out phenomenon) owing to thermal shock or the like
Data Source
AI summary
A thermally conductive grease composition includes: a base oil; a thermally conductive filler containing zinc oxide and aluminum nitride; and calcium carbonate particles.