Boron Nitride Powder Purification for Dielectric Breakdown Prevention
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Solution Overview
Problem
Conventional boron nitride powders used in heat-transmitting sheets for electronic components face dielectric breakdown issues when exposed to high voltage due to trace amounts of carbon-containing particles, which affect insulation performance.
Innovation Solution
A boron nitride powder with a high degree of purity (98.5% or more) and reduced carbon content (10 or less particles per 10g) is developed, along with a production method involving heat-treatment in an oxygen-rich atmosphere to minimize carbon impurities and improve insulation and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional boron nitride powder with high purity is used, then thermal conductivity and lubricity are improved, but insulation performance deteriorates due to trace carbon-containing particles causing dielectric breakdown
Solution Approach 1:
The patent extracts and removes carbon-containing particles from the boron nitride powder through optimized production processes and classification methods. By separating out these harmful impurities (carbon-containing particles) from the main boron nitride product, the insulation performance is improved while maintaining the thermal conductivity benefits of the boron nitride material.
Solution Approach 2:
The patent changes the purity parameter of boron nitride powder from conventional high purity (98-99%) to ultra-high purity (99.5% or more) by controlling production parameters and implementing additional purification steps. This parameter change eliminates the harmful effect of carbon-containing particles while preserving the beneficial thermal conductivity property.
2Reliability
If boron nitride powder with reduced carbon content is produced, then insulation performance is improved, but production complexity increases due to additional purification steps
Solution Approach 1:
The patent implements preliminary purification actions during the production process itself, incorporating classification steps and purity control measures at early stages. By performing these purification actions preliminarily rather than as final post-processing steps, the overall production complexity is managed more effectively while achieving the desired ultra-high purity level.
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 boron nitride powder exhibits enhanced insulation and heat dissipation performance under severe conditions, effectively preventing dielectric breakdown and maintaining performance even when exposed to high voltage for extended periods.
Implementation Method 1
hexagonal boron nitride has excellent lubricity, high thermal conductivity
Implementation Method 2
insulation properties, and the like... dielectric breakdown and the like of the heat-transmitting sheet may occur
Data Source
AI summary
One aspect of the present disclosure provides a boron nitride powder containing agglomerated particles formed by agglomeration of primary particles of hexagonal boron nitride, in which a degree of purity is 98.5% by mass or more, and a number of particles containing carbon is 10 or less per 10 g of the boron nitride powder.