Thermally Conductive Sheet with Oriented Boron Nitride
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Solution Overview
Problem
Conventional thermally conductive sheets with high inorganic filler content suffer from loss of flexibility and crumbling, limiting their thermal conductivity enhancement, and their non-tacky surfaces hinder proper attachment to electronic components, leading to potential misalignment during mounting.
Innovation Solution
A thermally conductive sheet with boron nitride flakes oriented in the thickness direction and a tacky surface is created by using a binder resin and boron nitride flakes, ensuring both sides are tacky, allowing for secure attachment and preventing misalignment during mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the filler content of inorganic fillers is increased to improve thermal conductivity, then thermal conductivity is improved, but flexibility is lost and the sheet crumbles
Solution Approach 1:
The patent changes the orientation parameter of boron nitride flakes from random to aligned in the thickness direction, and modifies the binder resin composition parameters to achieve both high thermal conductivity and flexibility. This allows optimizing the balance between thermal performance and mechanical properties without simply increasing filler content
Solution Approach 2:
The patent uses a composite material system combining binder resin with specifically oriented boron nitride flakes, creating a composite structure that leverages the high thermal conductivity of boron nitride while the binder resin matrix provides flexibility and structural integrity
2Ease of operation
If the surface of the thermally conductive sheet is made non-tacky for ease of handling, then handling is easier, but the sheet cannot be attached to the adherend and misalignment occurs
Solution Approach 1:
The patent applies local quality by making only the surface layers tacky while the interior maintains its structural properties. The surface tackiness is achieved through specific binder resin composition and orientation control, allowing the sheet to be handled properly while ensuring reliable attachment to adherends
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 thermally conductive sheet with enhanced tackiness and secure attachment to electronic components, effectively addressing the limitations of flexibility and thermal conductivity in existing sheets while ensuring proper mounting and heat dissipation.
Implementation Method 1
thermally conductive sheet containing a binder resin and boron nitride flakes, in which the boron nitride flakes are oriented in a thickness direction of the thermally conductive sheet
Data Source
AI summary
A thermally conductive sheet includes a binder resin and boron nitride flakes. The boron nitride flakes are oriented in a thickness direction of the thermally conductive sheet, and both surfaces of the thermally conductive sheet are tacky. A method for manufacturing a thermally conductive sheet includes preparing a thermally conductive composition containing a binder resin and boron nitride flakes. A molded block is formed from the thermally conductive composition. The molded block is sliced into a sheet shape to obtain a thermally conductive sheet precursor. The thermally conductive sheet precursor is pressed to obtain a thermally conductive sheet.