TIM with Covalently Bonded Release Layer
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Solution Overview
Problem
Conventional thermal interface materials (TIMs) used in burn-in applications tend to shear away from the aluminum foil release layer during repetitive cycles, leading to the need for frequent replacements and potential residue on electronic components.
Innovation Solution
A TIM with a covalently attached thermally conductive release layer is developed by modifying the aluminum foil surface with organosilanes, allowing for a strong bond with the TIM formulation, which includes unsaturated monomers and thermally conductive fillers like graphite, ensuring durable attachment without residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional TIM with non-covalently attached aluminum foil release layer is used, then the TIM allows easy release from electronic components, but the TIM tends to shear away from the release layer during repetitive burn-in cycles
Solution Approach 1:
The patent creates a composite structure where the TIM formulation layer is covalently bonded to the aluminum foil release layer through organosilane chemistry. The TIM formulation contains unsaturated monomers that form covalent bonds with the organosilane-modified aluminum foil surface, creating a durable composite material that maintains both release properties and attachment strength through multiple burn-in cycles
Solution Approach 2:
The patent modifies the chemical parameters of the aluminum foil surface by applying organosilane coatings and creating covalent bonds with unsaturated monomers in the TIM formulation. This chemical parameter change transforms the attachment mechanism from non-covalent (weak, prone to shearing) to covalent (strong, durable), while preserving the release layer functionality
2Productivity
If a conventional TIM is used in burn-in applications, then the TIM can be applied to heat sinks, but the TIM leaves residue on the surface of electronic components after removal
Solution Approach 1:
The patent separates the release function from the thermal interface function by using an aluminum foil release layer that is covalently bonded to the TIM formulation. The aluminum foil layer serves as a clean release surface that prevents residue formation on electronic components, while the TIM formulation layer maintains thermal conductivity and covalent attachment to the release layer
Solution Approach 2:
The organosilane-modified aluminum foil release layer acts as an intermediary between the TIM formulation and the electronic component surface. This intermediary layer enables easy, residue-free release while maintaining strong covalent attachment to the TIM formulation, solving the residue problem without compromising burn-in cycle efficiency
3Duration of action of stationary object
If the TIM is repetitively withdrawn from contact with electronic components, then the TIM can serve multiple burn-in cycles, but the TIM shears away from the release layer
Solution Approach 1:
The patent creates a composite material system where the TIM formulation layer is covalently bonded to the aluminum foil release layer through organosilane chemistry. This composite structure maintains strong bond strength through repetitive withdrawal cycles, extending the TIM lifespan without sacrificing attachment integrity
Solution Approach 2:
The patent changes the chemical bonding parameters from non-covalent to covalent attachment between the TIM formulation and release layer. This parameter change increases bond strength and durability, allowing the TIM to withstand repetitive burn-in cycles without shearing away, thereby extending operational lifespan
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 covalently attached TIM formulation enhances durability and removability, preventing shear issues and residue formation, thus extending the lifespan of the TIM and maintaining effective thermal conductivity across multiple burn-in cycles.
Implementation Method 1
The organosilane reacts with hydroxyl groups on the surface of the thermally conductive release layer
Implementation Method 2
curing the TIM formulation so that the unsaturated monomer of the TIM formulation reacts with the organosilane-coated surface of the modified release layer
Implementation Method 3
a thermally conductive release layer (e.g., aluminum foil)
Data Source
AI summary
A thermal interface material (TIM) includes a modified release layer having an organosilane-coated surface covalently bound to a TIM formulation layer. The modified release layer may be formed by applying an organosilane (e.g., vinyltriethoxysilane) to the surface of a thermally conductive release layer (e.g., aluminum foil). The organosilane reacts with hydroxyl groups on the surface of the thermally conductive release layer. The TIM formulation layer may be formed by applying a TIM formulation (e.g., a graphite TIM formulation) containing an unsaturated monomer (e.g., methyl acrylate) to the organosilane-coated surface of the modified release layer, and then curing the TIM formulation so that the unsaturated monomer of the TIM formulation reacts with the organosilane-coated surface of the modified release layer.