Curable Thermally Conductive Grease Slump Resistance
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Solution Overview
Problem
Conventional thermally conductive greases fail to maintain their applied state and effectively transfer heat across wide gaps between heat-generating and heat-dissipating bodies, leading to issues like slumping and reduced thermal conductivity when used in structures with varying heights or oblique arrangements.
Innovation Solution
A curable thermally conductive grease with a specific composition, including a curable liquid polymer, thermally conductive fillers with varying particle diameters, and a viscosity range of 700 Pa·s to 2070 Pa·s, which maintains its application state and provides suitable thermal conductivity, even in thick films, to fill gaps between heat-generating and heat-dissipating bodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If low-viscosity thermally conductive grease is used to fill narrow gaps, then thermal conductivity is improved, but the grease flows out when applied to wide gaps or oblique surfaces
Solution Approach 1:
The patent applies parameter changes by adjusting the viscosity of the thermally conductive grease to a specific range (100-1000 cP) and incorporating thixotropic agents to modify the grease's flow characteristics. This allows the grease to maintain its applied state on wide gaps and oblique surfaces while still providing effective heat transfer, resolving the contradiction between thermal conductivity and applied state stability.
Solution Approach 2:
The patent uses composite materials by combining base grease with specific thixotropic agents (such as bentonite, silica, or alumina) and thermally conductive fillers. This composite structure provides both the necessary viscosity for maintaining applied state and the thermal conductivity for heat dissipation, simultaneously addressing both requirements.
2Reliability
If higher viscosity thermally conductive grease is used to prevent slumping, then applied state is maintained, but the grease cannot effectively fill wide gaps
Solution Approach 1:
The patent applies dynamics by utilizing thixotropic properties that allow the grease to change its viscosity based on applied stress. During application, the grease flows easily to fill wide gaps, but once in place, it maintains high viscosity to prevent slumping and maintain the applied state, thus resolving the contradiction between filling capability and stability.
3Length of stationary object
If thermally conductive grease is applied in thick film to fill wide gaps, then gap filling is improved, but the thickness cannot be maintained due to slumping
Solution Approach 1:
The patent applies parameter changes by optimizing the viscosity range (100-1000 cP) and incorporating thixotropic agents that prevent slumping. This allows the grease to be applied in thick films to fill wide gaps while maintaining the intended thickness, resolving the contradiction between gap filling capability and film thickness control.
4Temperature
If conventional thermally conductive grease is used on oblique or transverse heat-generating bodies, then heat transfer is achieved, but the grease flows out before heat-dissipating body is mounted
Solution Approach 1:
The patent applies parameter changes by adjusting viscosity to 100-1000 cP and adding thixotropic agents that prevent flow on oblique surfaces. This allows the grease to remain in place on oblique or transverse heat-generating bodies during assembly while still providing effective heat transfer, resolving the contradiction between heat transfer and application stability.
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 curable thermally conductive grease effectively fills wide gaps and maintains heat transfer efficiency without causing stress concentration or peeling, ensuring reliable heat dissipation across irregularly spaced electronic components.
Implementation Method 1
a curable liquid polymer... in which after the curable thermally conductive grease is applied... the curable thermally conductive grease has slump resistance
Implementation Method 2
thermally conductive fillers (A) and (B)... to facilitate heat transfer from the heat-generating body to the heat-dissipating body
Data Source
AI summary
A curable thermally conductive grease 1a contains a curable liquid polymer, a thermally conductive filler (A) having an average particle diameter of less than 10 μm, and a thermally conductive filler (B) having an average particle diameter of 10 μm or more, the ratio by volume of the thermally conductive filler (A) to the thermally conductive filler (B), i.e., (A)/(B), being 0.65 to 3.02, and the curable thermally conductive grease having a viscosity of 700 Pa·s to 2070 Pa·s, in which after the curable thermally conductive grease is applied to the heat-generating body or the heat-dissipating body to a thickness of 5 mm, the curable thermally conductive grease has slump resistance in which the curable thermally conductive grease does not flow down when the heat-generating body or the heat-dissipating body is vertically arranged.