Core-Shell Cubic Boron Nitride Powder for Low-Pressure Synthesis
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Solution Overview
Problem
The production of cubic boron nitride powder is limited by high-pressure and high-temperature conditions, and post-processing is difficult due to its high hardness, making it challenging to achieve desired particle sizes and shapes.
Innovation Solution
A method involving a core-shell structure is used, where a boron nitride powder is formed around a metal or ceramic additive, allowing for low-temperature and low-pressure synthesis, resulting in cubic boron nitride powder with a controlled shape and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cubic boron nitride is formed by heat-treating a mixture of nitride precursor and boron precursor at high pressure and high temperature, then cubic boron nitride powder can be produced, but mass production is limited due to the extreme process conditions
Solution Approach 1:
The patent changes the formation parameters from extreme high-pressure high-temperature conditions to lower temperature (500-1000°C) and atmospheric pressure conditions by using metal or silicon catalysts as additives, enabling mass production while maintaining cubic boron nitride formation
Solution Approach 2:
The patent introduces metal or silicon catalysts as intermediary substances that facilitate the formation of cubic boron nitride at lower temperatures and pressures, acting as mediators between the precursors and the desired product
2Strength
If cubic boron nitride powder is produced, then high hardness and thermal conductivity are achieved, but post-processing is difficult due to high hardness when changing particle size
Solution Approach 1:
The patent performs preliminary action by controlling the particle size and shape of cubic boron nitride during the formation process itself, rather than attempting to modify the size after formation. The catalyst additives determine the final particle characteristics, eliminating the need for difficult post-processing operations
3Reliability
If high-pressure and high-temperature process conditions are used to form cubic boron nitride, then the cubic boron nitride can be formed, but the process efficiency is reduced
Solution Approach 1:
The patent changes the process parameters from extreme conditions (13 GPa+, 2500-4000 K) to moderate conditions (500-1000°C, atmospheric pressure) by introducing catalysts, significantly improving process efficiency and enabling industrial-scale production
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 method enables efficient production of cubic boron nitride powder with desired properties without the need for post-processing, suitable for applications requiring specific shapes and sizes, such as high heat dissipation and electromagnetic wave shielding materials.
Implementation Method 1
the temperature and pressure of the process for manufacturing cubic boron nitride powder may be reduced as the metal or silicon catalyst is included as an additive
Implementation Method 2
the cubic boron nitride may be formed by heat-treating a mixture of a nitride precursor and a boron precursor
Data Source
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AI summary
Boron nitride powder according to an embodiment includes a core and a shell surrounding the outside of the core, wherein the core includes at least one metal material of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and Zn or at least one ceramic material of Al2O3, ZrO2, ZnO, MgO, SiC, AlN, Si3N4, and SiO2, wherein the shell comprises boron nitride.