Heat-Conductive Sheet Composition for Shape Retention and Followability
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Solution Overview
Problem
Heat-conductive sheets with insufficient shape retention and resilience lead to poor workability, installation defects, and reliability issues due to insufficient resilience and tendency for pump-outs, affecting thermal conductivity.
Innovation Solution
A heat-conductive sheet comprising a mixture of a silicone matrix and a hydrocarbon compound with a melting point above 23°C, combined with a heat-conductive filler, achieving a compression ratio of 15% or more at 80°C and 0.276 MPa, ensuring shape retention and enhanced thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a phase-change-type heat-conductive sheet or polymer gel-based heat-conductive sheet is used to enhance softness and thermal conductivity, then the followability to heating element and heat sink is improved, but the shape retention and resilience become insufficient
Solution Approach 1:
The patent uses a composite binder component consisting of silicone polymer and hydrocarbon compound with specific melting point range (23°C to 80°C). This composite material combines the softness and followability of phase-change materials with the shape retention and resilience of silicone polymer, resolving the contradiction between ease of operation and stability of composition.
Solution Approach 2:
The patent specifies precise parameter ranges for the hydrocarbon compound (melting point: 23°C to 80°C, content: 5-50 parts by mass per 100 parts binder component) and compression ratio (15-60%) to optimize both softness during use and shape retention. By controlling these parameters, the material achieves adequate followability while maintaining sufficient resilience.
2Ease of operation
If the heat-conductive sheet is made softer to improve thermal conductivity through better contact, then the followability is enhanced, but the workability during installation and processing becomes poor
Solution Approach 1:
The patent controls the melting point of the hydrocarbon compound to be within 23°C to 80°C, ensuring the material remains solid at room temperature for easy handling and cutting, but becomes soft enough at operating temperatures to provide good followability. The compression ratio is controlled at 15-60% to balance softness and processability.
3Ease of operation
If a high compression ratio is achieved to improve thermal conductivity through better contact, then the followability is enhanced, but the reliability decreases due to pump-outs and insufficient rebound resilience
Solution Approach 1:
The silicone polymer component provides elastic rebound resilience to prevent pump-outs and maintain reliability, while the hydrocarbon compound provides softness and followability. This composite structure allows the sheet to achieve high compression ratio (15-60%) for good thermal contact while maintaining sufficient rebound capability through the silicone polymer's elasticity.
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 provides a heat-conductive sheet with improved shape retention, reliability, and thermal conductivity by maintaining softness during use, reducing pump-outs, and facilitating easy installation and processing.
Implementation Method 1
a compound that is solid or paste-like at normal temperature and liquefied by heating
Implementation Method 2
a heat-conductive sheet that is used in a state in which it is disposed between a heating element and a heat sink
Data Source
AI summary
Provided is a heat-conductive sheet including: a binder component that is a mixture of a silicone matrix (A) and a hydrocarbon compound (B); and a heat-conductive filler (C) dispersed in the binder component, wherein the heat-conductive sheet has a compression ratio at 80° C. and 0.276 MPa of 15% or more and a shape retention.