Activable Shrinkage Thermal Interface Material
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing thermal interface materials (TIMs) require external contact pressure to ensure optimal thermal performance, which complicates system design, increases costs, and can lead to issues like contamination and delamination due to thermal cycling, especially in systems with plastic components or large surface areas.
Innovation Solution
A TIM layer with an activable shrinkage material that increases in thickness upon activation, providing controlled physical dimensions and enhanced contact pressure between heat generating and conducting components, thereby eliminating the need for external pressure and improving robustness against surface curvature and roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external contact pressure is applied to ensure optimal thermal performance, then thermal contact is improved, but system design complexity and cost increase
Solution Approach 1:
The TIM layer performs self-adjustment by automatically generating contact pressure through its own material properties. The shrinkage material within the TIM layer contracts upon activation, creating internal forces that press the TIM against the mating surfaces without requiring external pressure application mechanisms.
Solution Approach 2:
The TIM layer transitions from a static material to a dynamic one that changes its physical state upon activation. The shrinkage material undergoes dimensional change, allowing the TIM to adapt its thickness and contact pressure dynamically in response to thermal conditions, ensuring optimal thermal contact across varying operating conditions.
2Reliability
If external contact pressure is applied to ensure optimal thermal performance, then thermal contact is improved, but contact pressure dependence increases
Solution Approach 1:
The TIM layer generates its own contact pressure through the shrinkage material's contraction, making the system self-regulating. This eliminates dependence on external pressure sources and allows the TIM to maintain optimal contact pressure independently of external conditions or assembly variations.
Solution Approach 2:
The TIM layer changes its physical parameters (thickness, density, contact pressure) through the activation of shrinkage material. This parameter transformation allows the material to adapt to different surface conditions and maintain reliable thermal contact without requiring precise control of external pressure parameters.
3Reliability
If minimum contact pressure is required for optimal thermal performance, then thermal resistance is reduced, but manufacturing difficulty increases
Solution Approach 1:
The TIM layer automatically generates the required contact pressure through its internal shrinkage mechanism, eliminating the need for precise pressure control during manufacturing. This self-generating capability simplifies the mounting process and reduces manufacturing complexity while ensuring optimal thermal performance.
Solution Approach 2:
The shrinkage material is pre-configured within the TIM layer structure during manufacturing. Upon activation, this pre-positioned material contracts to generate contact pressure, ensuring that the optimal pressure condition is achieved automatically during operation without requiring complex manufacturing processes or precise assembly procedures.
4Reliability
If contact pressure is applied to ensure physical contact, then thermal interface quality is improved, but TIM pumping out increases
Solution Approach 1:
The TIM layer transitions to a dynamic state where the shrinkage material continuously adjusts its contraction to maintain optimal contact pressure. This dynamic adaptation prevents the TIM from being pumped out by distributing and regulating the contact forces, maintaining physical contact without creating excessive localized pressure that would cause material ejection.
5Reliability
If external pressure is applied to guarantee thermal performance, then contact area is increased, but geometric non-uniformity causes interface deformation
Solution Approach 1:
The TIM layer generates contact pressure internally through its shrinkage material, applying force uniformly across its entire surface area. This self-generated pressure distribution avoids the geometric non-uniformity and localized deformation that occurs with external pressure application, maintaining both large contact area and interface integrity.
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 TIM layer ensures consistent and improved thermal contact without external pressure, reducing system design complexity and costs, while maintaining structural integrity and preventing delamination, thus offering a more robust thermal interface solution.
Implementation Method 1
a TIM layer which comprises an activable shrinkage material. The shrinkage material is distributed in the TIM layer such that upon activation of the shrinkage material the thickness of the TIM layer is increased
Data Source
AI summary
There is provided a thermal interface material, TIM, a thermal interface application comprising such a TIM, and corresponding methods for providing the material and the thermal interface. The TIM comprises a TIM layer in which an activable shrinkage material is distributed, such that upon activation of the shrinkage material the thickness of the TIM layer is increased. In the thermal interface application, where the TIM (400) is arranged between a heat generating component (20) and a heat conducting element (30), the increase in thickness of the TIM layer is utilized to increase the contact pressure on mating surfaces. The TIM is sandwiched between the heat generating component and the heat conducting element before the activation of the shrinkage material, and the distance (h) between the heat generating component and the heat conducting element is restricted such upon activation of the shrinkage material, the restricted maximum height (h) between the heat generating component and the heat conducting element in combination with the TIM increasing the thickness of the TIM layer, the contact pressure on the mating surfaces is increased.