Nonlinear Resistive Coating Suppresses Foreign Substance Movement
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Solution Overview
Problem
Conventional insulating coating materials for high-voltage applications face challenges in miniaturization due to foreign substance movement within closed insulating devices, which affects insulation performance and requires larger container sizes to suppress floating and movement of foreign substances, and they often fail to exhibit nonlinear resistance characteristics due to whisker aggregation.
Innovation Solution
A nonlinear resistive coating material is developed, comprising a matrix resin (such as epoxy, acrylic, or polyurethane) with ZnO-containing particles and titanate-coupled semiconductive whiskers, which form a conductive path to enhance insulation and prevent foreign substance movement, while maintaining the nonlinear resistance characteristic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the size of the metal container is increased to suppress foreign substance movement, then insulation performance is improved, but device miniaturization is hindered
Solution Approach 1:
A coating layer is applied to the inner surface of the metal container to act as an intermediary that suppresses charge supply to foreign substances. This coating layer contains nonlinear resistive particles that provide controlled electrical properties, preventing foreign substance movement without requiring an increase in container size.
Solution Approach 2:
The coating material's electrical resistance characteristics are changed by incorporating nonlinear resistive particles. The coating exhibits high resistance under normal operating voltages to prevent charge supply and foreign substance movement, but can dissipate charge under abnormal high-voltage conditions, providing adaptive insulation control.
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 coating material effectively suppresses foreign substance movement, allows for a more compact design by increasing the electric field intensity without dielectric breakdown, and consistently exhibits superior nonlinear resistance characteristics.
Implementation Method 1
a nonlinear resistive coating material... particles made of a sintered compact containing ZnO as a main component... semiconductive whiskers made of ZnO subjected to titanate coupling surface modification treatment
Implementation Method 2
form a conductive path to enhance insulation and prevent foreign substance movement
Implementation Method 3
semiconductive whiskers made of ZnO subjected to titanate coupling surface modification treatment
Data Source
AI summary
A nonlinear resistive coating material 20 in an embodiment includes: a matrix resin 22 made of an epoxy resin which is cured by adding a curing agent thereto; ZnO-containing particles 21 dispersedly contained in the matrix resin 22 and made of a sintered compact containing ZnO as a main component; and semiconductive surface-treated whiskers 10 dispersedly contained in the matrix resin 22 and made of ZnO subjected to titanate coupling surface modification treatment.