Precast Thermal Interface Adhesive for Repeated Remating
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Solution Overview
Problem
Current thermal interface materials (TIMs) face challenges in enabling easy and repeatable separation and remating of electronic components without degrading thermal performance, as they are often designed for single-use, require solvent-based cleaning, and can trap air due to flat profiles, leading to increased thermal resistance.
Innovation Solution
A precast curable TIM adhesive is applied to a heat spreader or heat sink surface, mated with a dummy substrate coated with a release layer, allowing for controlled bonding and easy separation and remating without solvent cleaning, using external spacers or particles to achieve target bondlines and matching surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional thermal interface materials (TIMs) are used for single-use applications, then separation is enabled, but repeated remating requires solvent cleaning and degrades thermal performance
Solution Approach 1:
The patent applies parameter changes by transitioning the TIM from a permanent adhesive state to a reversible adhesive state through controlled temperature changes. The TIM is cured at elevated temperatures to provide strong bonding during operation, then softened at lower temperatures to enable easy separation and remating without degradation of thermal performance or requirement for solvent cleaning.
Solution Approach 2:
The patent implements dynamics by making the adhesive properties of the TIM changeable over time and temperature. The TIM transitions from a soft, easily applied state at room temperature to a cured, strongly bonded state at elevated temperatures, and can be reversibly transitioned back to the soft state for separation, enabling dynamic control of bond strength without degradation.
2Ease of manufacture
If flat-profile TIM pads or films are used, then application is simplified, but air entrapment increases thermal resistance
Solution Approach 1:
The patent employs a flexible thin film TIM that can conform to surface irregularities while maintaining controlled thickness. The film's flexibility allows it to adapt to the mating surfaces, reducing air entrapment and thermal resistance, while its thin profile enables simplified application processes.
Solution Approach 2:
The patent utilizes a slightly convex or curved profile on the TIM rather than a completely flat profile. This curvature helps eliminate air pockets and ensures better contact between mating surfaces, reducing thermal resistance while maintaining ease of application through the self-leveling properties of the viscoelastic material.
3Reliability
If curable TIM adhesives are used to enable repeated separation and remating, then thermal performance is maintained, but control of curing temperature and safety protocols are required
Solution Approach 1:
The patent employs a precast TIM adhesive that is designed for single-application but repeated-use scenarios. The TIM is pre-cured to a stable state that provides consistent thermal performance, eliminating the need for complex real-time curing control during assembly while maintaining the ability to separate and remate through controlled softening at lower temperatures.
4Ease of manufacture
If manual cleaning methods are used for separated components, then solvent application is simple, but cleaning control is less precise than manufacturing processes
Solution Approach 1:
The patent implements a self-cleaning mechanism where the viscoelastic properties of the TIM allow it to conform to and fill surface irregularities upon remating. This self-adjusting capability compensates for minor imperfections in cleaning, maintaining precise thermal interface contact without requiring highly controlled manual cleaning procedures.
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 solution allows for multiple cycles of separation and remating without thermal performance degradation, reducing thermal resistance and eliminating the need for solvent cleaning, while maintaining strong adhesion to the heat spreader or sink surface.
Implementation Method 1
The TIM adhesive adheres strongly and permanently fixed to the heat spreader or sink surface to which it was previously applied
Implementation Method 2
Precast curable thermal interface adhesive for easy and repeated, separation and remating
Data Source
AI summary
Precast curable thermal interface adhesives facilitating the easy and repeatable separation and remaining of electronic components at thermal interfaces thereof, and a method for implementing the foregoing repeatable separation and remating at the thermal interfaces of components through the use of such adhesives.