Phase Change Material Thermal Interface for Vertical Drip Prevention
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Solution Overview
Problem
Traditional thermal interface materials tend to drip out of the interface when electronic components are in a vertical orientation, leading to inefficiencies in heat transfer due to lack of support and poor thermal resistance.
Innovation Solution
A thermal interface material comprising at least 80 wt.% thermally conductive fillers, primarily zinc oxide particles of 0.1 to 1 micron diameter, along with a polymer matrix and amine-based crosslinker, which provides enhanced thermal conductivity and stability, preventing dripping even in vertical orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phase change materials (paraffin, fatty acid, sugar alcohol) are used, then phase change function is provided, but decomposition occurs at high temperature and corrosive substances are generated
Solution Approach 1:
The patent changes the chemical composition parameters by using inorganic salt hydrates (such as sodium sulfate decahydrate, sodium acetate trihydrate) instead of organic compounds. This parameter change eliminates decomposition and corrosive substance generation while maintaining phase change functionality, directly resolving the technical contradiction between reliability and harmful factors.
Solution Approach 2:
The patent employs composite material systems combining inorganic salt hydrates with specific additives (such as glycerol, sorbitol, or other inorganic salts) to create stable phase change compositions. These composite materials achieve both high thermal stability and non-corrosiveness, simultaneously improving reliability while eliminating harmful factors.
2Reliability
If inorganic salt hydrate is used as phase change material, then decomposition is suppressed and corrosiveness is reduced, but crystallization occurs irregularly and supercooling is large
Solution Approach 1:
The patent introduces nucleating agents (such as silica gel, activated carbon, or specific metal oxides) as intermediaries to facilitate regular crystallization. These nucleating agents provide surfaces for crystal formation, enabling controlled and regular crystallization while maintaining the inherent thermal stability of inorganic salt hydrates, thus resolving the contradiction between reliability and compositional stability.
Solution Approach 2:
The patent adjusts the composition parameters by optimizing the ratio of inorganic salt hydrate to additives and controlling purity levels. By precisely controlling these parameters, the patent achieves both suppression of decomposition and regular crystallization behavior, resolving the technical contradiction.
3Reliability
If organic compounds (paraffin, fatty acid, sugar alcohol) are used, then phase change function is provided, but fire risk increases and decomposition occurs
Solution Approach 1:
The patent fundamentally changes the chemical nature parameter from organic to inorganic compounds. Inorganic salt hydrates inherently possess non-flammable properties while maintaining effective phase change functionality, directly resolving the contradiction between phase change function and fire risk.
Solution Approach 2:
The patent converts the potential disadvantage of inorganic materials (irregular crystallization) into a benefit by using the high thermal stability and non-flammability of inorganic salt hydrates to eliminate fire risk, while separately addressing crystallization issues through nucleating agents. This transforms the material selection into a beneficial solution for safety.
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 material effectively transfers heat with reduced thermal impedance and maintains integrity at elevated temperatures, passing both baking and thermal cycling tests, ensuring reliable performance.
Implementation Method 1
a phase change material for a thermal energy storage device, which has a melting point between 0°C and 100°C and does not exhibit any supercooling upon freezing
Implementation Method 2
Phase change materials (PCMs) are substances that absorb and/or release large amounts of energy during phase transitions between solid, liquid and gaseous states
Implementation Method 3
a thermoplastic polymer matrix which comprises at least one thermoplastic polymer and has a glass transition temperature between -50°C and 100°C
Data Source
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AI summary
A thermal interface material includes, in one exemplary embodiment, at least one polymer, at least one phase change material, at least one crosslinker, and at least one thermally conductive filler. The at least one thermally conductive includes a first plurality of particles having a particle diameter of about 1 micron or less. The at least one thermally conductive filler comprises at least 80wt.％ of the total weight of the thermal interface material. A formulation for forming a thermal interface material and an electronic component including a thermal interface material are also provided.