Anisotropic Graphite Heat Radiation Sheet
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Solution Overview
Problem
Current heat radiation sheets face challenges in balancing heat-radiating properties with handleability, particularly in coping with temperature changes and maintaining strength, softness, and tackiness, while existing solutions are either costly or insufficient in thermoconductivity.
Innovation Solution
A heat radiation sheet is developed with anisotropic graphite powder oriented in a specified direction within a binder component comprising thermoplastic and thermosetting rubber components, along with a thermosetting rubber curing agent, to enhance thermoconductivity, tackiness, heat resistance, and strength, achieved through a specific manufacturing process involving lamination and slicing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grease type material is used to improve heat-radiating property, then heat radiation property is improved, but handleability deteriorates due to stickiness
Solution Approach 1:
The invention changes the physical state parameter from liquid/grease to solid sheet form, eliminating stickiness while maintaining heat radiation function. The sheet material provides the same thermal conduction benefits without the handling disadvantages of adhesive grease materials.
Solution Approach 2:
The heat radiation sheet is designed as a disposable or replaceable component that can be easily installed and removed, unlike permanent grease applications. This improves handleability and workability while maintaining effective heat radiation during its service life.
2Reliability
If grease type material is used to improve heat-radiating property, then heat radiation property is improved, but workability deteriorates during fabrication
Solution Approach 1:
Changing from liquid grease to solid sheet form eliminates contamination risks, simplifies installation procedures, and improves fabrication workability. The sheet can be pre-cut and positioned without affecting assembly line efficiency or product cleanliness.
3Reliability
If grease material is used, then heat-radiating property is improved, but heat-radiating property changes with temperature due to viscosity change
Solution Approach 1:
The invention changes the material state from liquid grease with temperature-dependent viscosity to solid sheet material with stable physical properties. The sheet maintains consistent thermal conduction characteristics across the operating temperature range without the viscosity fluctuations that affect grease performance.
4Strength
If indium sheet is used to provide softness, then sheet properties are improved, but cost increases
Solution Approach 1:
The invention replaces expensive indium with a cost-effective polymer-based sheet material that provides adequate softness and heat radiation properties for the application. This significantly reduces material cost while maintaining the necessary functional performance.
Solution Approach 2:
The heat radiation sheet uses composite polymer materials that combine softness, thermal conduction, and cost-effectiveness. This composite approach achieves the desired properties without relying on expensive pure metal materials like indium.
5Reliability
If heat radiation sheet is made thinner to improve heat radiation, then heat-radiating property is improved, but strength deteriorates
Solution Approach 1:
The invention optimizes the thickness parameter to achieve the best balance between heat radiation efficiency and mechanical strength. The sheet is designed with sufficient thickness to maintain structural integrity while remaining thin enough to provide effective thermal conduction, unlike both thicker and thinner alternatives.
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 sheet achieves a superior balance of heat-radiating properties and handleability, maintaining stability across temperature changes, with improved thermoconductivity, tackiness, heat resistance, and strength, suitable for diverse thermal environments.
Implementation Method 1
anisotropic graphite powder which has been oriented into a specified direction... excellent heat-radiating property... improved thermoconductivity
Implementation Method 2
a thermosetting rubber curing agent crosslinkable with the thermosetting rubber component (B)... improved heat resistance and strength
Implementation Method 3
surface tackiness (bonding function based on stickiness)... improved tackiness
Data Source
AI summary
A heat radiation sheet having high heat-radiation property and excellent handleability and having sheet properties permitting the sheet to cope with changes in use temperature thereof. Also provided is a heat radiation device using the sheet. The heat radiation sheet comprises: a binder component comprising: (A) a thermoplastic rubber component; (B) a thermosetting rubber component; and (C) a thermosetting rubber curing agent crosslinkable with the thermosetting rubber component (B); and an anisotropic graphite powder oriented into a specified direction in the binder component.