Thermal Grease Viscosity Dynamics for Electronic Control Substrate Connection
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Solution Overview
Problem
Conventional thermal greases face challenges such as nozzle clogging during application, inefficiency in large quantity usage, and reduced heat radiation due to frame placement, which increases operational costs and vulnerability to thermal deformation and vibration.
Innovation Solution
A thermal grease with viscosity that increases after application, allowing for easier application and improved workability, while maintaining shape stability and enhancing heat radiation efficiency without the need for additional frames or costly multi-layered structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a thermal grease with high initial viscosity is used to raise thermal conductivity by mixing alumina, then heat radiation efficiency is improved, but application property deteriorates causing nozzle clogging
Solution Approach 1:
The thermal grease is designed with dynamic viscosity characteristics: low viscosity at application temperature for easy dispensing, and high viscosity at operating temperature for shape stability. This dynamic property resolution allows the same material to satisfy both application ease and heat radiation requirements under different conditions.
Solution Approach 2:
The viscosity parameter of the thermal grease is changed based on temperature conditions. The grease exhibits temperature-dependent viscosity: low at room temperature during application, and high at operating temperature for shape maintenance. This parameter change resolves the contradiction between application property and heat radiation efficiency.
2Ease of operation
If a multi-layered structure of low viscosity layer and high viscosity layer is used, then application property is improved and shape stability is maintained, but cost increases
Solution Approach 1:
The invention segments the viscosity function into two temporal phases: application phase with low viscosity and operational phase with high viscosity. This is achieved through a single material with temperature-dependent rheological properties rather than a multi-layered structure, thereby reducing complexity and cost while maintaining both application ease and shape stability.
Solution Approach 2:
Instead of using a multi-layered structure with different viscosity materials, the invention uses a single thermal grease whose viscosity parameter changes with temperature. This eliminates the need for complex multi-layered structures and associated costs while achieving the same functional outcomes of easy application and shape stability.
3Stability of the object's composition
If the thermal grease is surrounded with a frame to prevent shape loss, then shape stability is improved, but heat radiation efficiency deteriorates due to expanded clearance
Solution Approach 1:
The invention converts the potential harm of thermal deformation into a benefit by using the thermal deformation itself to trigger viscosity increase in the grease. The heat that would cause shape loss is instead used to transform the grease into a higher viscosity state, stabilizing its shape. This eliminates the need for frames that would block heat radiation.
Solution Approach 2:
The thermal grease performs self-stabilization through temperature-dependent viscosity changes. When heated by the electronic component, the grease automatically increases its viscosity to prevent shape loss and flow-out, without requiring external frames or structural support. This self-service mechanism maintains both shape stability and heat radiation efficiency.
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 thermal grease facilitates smooth application, prevents shape loss and flow-out due to thermal deformation, and enhances heat radiation while reducing operational costs and complexity.
Implementation Method 1
incorporating a silane coupling agent for adhesion
Implementation Method 2
a heat conductive material 104 lies between an electronic component 102 loaded onto a circuit board 101 and a case body 103. Heat generation from the electronic component 102 is transmitted to the case body 103 through the heat conductive material 104
Implementation Method 3
viscosity adjustment through addition reaction or room temperature and humidity
Implementation Method 4
viscosity adjustment through addition reaction or room temperature and humidity
Data Source
AI summary
In a configuration that a thermal grease is applied between a circuit board having an electronic component mounted thereon and a case body containing the board to thermally connect both by the thermal grease, the application has not been easy since the thermal grease is high in initial viscosity.A thermal grease is made of a material that has a viscosity not impeding applicability at the initial stage (before application), for example, a viscosity of about 50-400 (Pa·s), and that increases to about 600-3,000 (Pa·s) in viscosity after application.