Thermally Conductive Sheet Using Titanium Oxide and Nitride
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Solution Overview
Problem
Thermally conductive sheets face challenges in achieving high thermal conductivity while maintaining insulation properties and designability, as increasing filler content impairs permittivity and designability, and adding carbon black introduces electrical conductivity.
Innovation Solution
Incorporating titanium oxide, titanium nitride, and a thermally conductive filler into a silicone resin-based binder, with specific mass ratios and particle sizes, to create a sheet with enhanced thermal conductivity, low permittivity, and improved designability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the blending amount of thermally conductive fillers (alumina or aluminum hydroxide) is increased to improve thermal conductivity, then thermal conductivity is improved, but the sheet turns white and designability deteriorates
Solution Approach 1:
The patent applies color change principle by incorporating carbon black as a coloring agent to transform the white appearance of alumina-filled sheets into black, thereby improving designability while maintaining high thermal conductivity through adequate filler content
2Shape
If carbon black is added to make the sheet black and improve designability, then designability is improved, but electrical conductivity is imparted and insulation property deteriorates
Solution Approach 1:
The patent applies parameter change principle by precisely controlling the carbon black content within 1-10 parts by mass per 100 parts by mass of thermally conductive filler, and controlling the ratio of aluminum hydroxide to alumina, thereby achieving black color with minimal electrical conductivity impact while maintaining insulation properties
3Temperature
If the total content of thermally conductive filler is increased to improve thermal conductivity, then thermal conductivity is improved, but permittivity increases and insulation property deteriorates
Solution Approach 1:
The patent applies composite material principle by creating a multi-component system comprising alumina, aluminum hydroxide, carbon black, and silicone resin, where the synergistic interaction between components achieves high thermal conductivity with controlled permittivity and maintained insulation properties
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 resulting thermally conductive sheet exhibits excellent thermal conductivity, insulation properties, low permittivity, and superior designability, with thermal conductivity of 4.8 W/mK and relative permittivity of 15.0 or less, while maintaining a black color for improved aesthetics.
Implementation Method 1
incorporating a binder component, titanium oxide, titanium nitride, and a thermally conductive filler other than these into a thermally conductive sheet
Implementation Method 2
it shows thermally conductive property to transfer heat generated from the heat generation part to the heat dissipation fin
Data Source
AI summary
It is an object of the present invention to provide a thermally conductive sheet that is excellent in thermally conductive property, has insulation property, has a low permittivity, and is excellent in designability. The thermally conductive sheet 1 comprises a binder component 11, titanium oxide, titanium nitride, and a thermally conductive filler 12 other than these, and a ratio of the titanium oxide to the total of the titanium oxide and the titanium nitride is 20 to 90% by mass. An L* value of a surface of the thermally conductive sheet 1 in the L*a*b* color system is preferably 41 or less. The total content of the titanium oxide and the titanium nitride is preferably 0.3 to 10.0 parts by mass based on the total amount 100 parts by mass of the thermally conductive filler 12.