Porous Boron Nitride Resin Composite Insulation

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Solution Overview

Problem

Composites of porous boron nitride sintered bodies impregnated with resin lack sufficient insulation properties, particularly under high voltage conditions.

Innovation Solution

A method involving multiple cycles of immersing a porous boron nitride sintered body in a resin composition under varying pressure conditions, including reduced and pressurized conditions, to enhance resin infiltration and dispersion, thereby improving insulation properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a porous boron nitride sintered body is impregnated with resin to improve thermal conductivity, then heat dissipation performance is improved, but insulation properties under high voltage deteriorate

Engineering Contradiction:

Improveheat dissipation performanceVSAvoidinsulation properties

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent applies periodic pressure cycles during resin impregnation, repeatedly alternating between pressurization and pressure reduction. This periodic action enables multiple resin infiltration cycles, ensuring thorough pore filling while maintaining proper resin distribution, thereby achieving both heat dissipation and insulation requirements

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent changes the pressure parameter dynamically during the impregnation process. By controlling pressure to alternate between high and low states multiple times, the resin is forced into pores and then allowed to distribute evenly. This parameter change ensures complete pore filling without compromising the insulation structure, resolving the contradiction between thermal conductivity and insulation properties

Inventive Principle:

Principle #35Parameter changes

2Temperature

If resin is impregnated into porous boron nitride to create composite structure, then thermal conductivity is improved, but void formation occurs reducing insulation quality

Engineering Contradiction:

Improvethermal conductivityVSAvoidvoid formation

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

The patent employs periodic pressure application during impregnation, cycling between pressurization (to force resin into pores) and pressure reduction (to allow resin distribution and prevent voids). This repeated cyclic action ensures complete pore filling while eliminating void formation, achieving both thermal conductivity improvement and manufacturing precision

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent maintains continuous resin infiltration through multiple pressure cycles, ensuring that the impregnation process is completed thoroughly without interruption. This continuous action prevents void formation by ensuring resin reaches all pores, while the cyclical nature allows proper distribution, thus improving thermal conductivity without compromising insulation quality

Inventive Principle:

Principle #20Continuity of useful action

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 produces a composite with superior insulation properties by effectively filling pores with resin and reducing void formation, enhancing both insulation and thermal conductivity.

Implementation Method 1

a porous boron nitride sintered body immersed in a resin composition under a pressurized condition

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Data Source

PatentEP3950643B1Method for producing composite body

Publication Date: 2023.06.28 DENKA CO LTD

AI summary

One aspect of the present invention is a method for producing a composite, including a step of placing a porous boron nitride sintered body immersed in a resin composition under a pressurized condition and then placing the boron nitride sintered body immersed in the resin composition under a pressure condition lower than the pressurized condition, wherein the step is repeated a plurality of times.