BaTiO3 Core-Shell Particle Coating for Uniform MLCC Dispersion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing core-shell particles for multilayer ceramic capacitors result in non-uniform particle distribution and dispersion due to random coating and simple mixing, affecting the performance and reliability of the finished products.
Innovation Solution
A method involving thermal plasma synthesis is used to produce core-shell particles by exposing barium titanate-based base powder and additives to a thermal plasma torch, forming a core portion with BaTiO3 and a shell portion with additives, which are introduced separately through different feeders to achieve a uniform coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If simple mixing method or heat treatment is used to produce core-shell particles, then the production process is simple, but the uniformity of particles decreases and additive material is added by random coating
Solution Approach 1:
The patent applies preliminary action by pre-coating the barium titanate core particles with a glass layer before adding functional additives. This sequential coating approach ensures that additives are deposited on a uniform base layer rather than directly on the core, improving distribution uniformity. The glass layer is formed first through controlled heating, creating a standardized surface for subsequent additive coating.
Solution Approach 2:
The patent segments the coating process into distinct stages: first forming a glass shell layer around the BaTiO3 core, then separately adding functional additives. This segmentation prevents random mixing and ensures controlled, uniform distribution of each material layer. The multi-stage process allows each component to be optimized independently while maintaining overall particle uniformity.
2Productivity
If additives are added by random coating, then the production process is fast, but the dispersion of material and distribution of products deteriorates
Solution Approach 1:
The glass layer is formed as a preliminary step before adding functional additives. This pre-formed glass shell provides a uniform surface that promotes consistent additive distribution. The preliminary glass coating acts as a buffer that prevents direct contact between additives and the BaTiO3 core, ensuring more uniform dispersion while maintaining production efficiency.
Solution Approach 2:
The glass layer serves as an intermediary between the BaTiO3 core and the functional additives. This intermediate layer facilitates uniform additive distribution by providing a consistent surface for additive deposition. The glass mediator prevents direct aggregation of additives on the core surface, improving overall material dispersion and product reliability.
3Reliability
If core-shell particles with uniform coating are produced, then the reliability of multilayer ceramic capacitors improves, but the production process complexity increases
Solution Approach 1:
The glass shell is formed as a preliminary structure that simplifies subsequent additive coating. By establishing this uniform base layer first, the process ensures reliable additive distribution without requiring complex real-time control mechanisms. The preliminary glass formation creates a standardized platform that naturally promotes uniform additive placement.
Solution Approach 2:
The production process is segmented into distinct coating stages (glass layer formation, then additive coating), which simplifies process control compared to attempting to deposit multiple materials simultaneously. Each segment can be optimized independently, and the sequential nature ensures uniform layer formation without requiring complex multi-material deposition equipment.
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
This method ensures uniform particle distribution, allows for high-performance and reliable multilayer ceramic capacitors with controlled impurities and easy mass production, achieving ultra-fine particles with narrow size distribution and improved reliability.
Implementation Method 1
exposing the barium titanate-based base powder and the additive to a thermal plasma torch to obtain a core-shell particle including a core portion having barium titanate (BaTiO3) and a shell portion including the additive and formed on a surface of the core portion
Data Source
AI summary
A method of producing a core-shell particle includes introducing a barium titanate-based base powder and an additive to a reactor, and exposing the barium titanate-based base powder and the additive to a thermal plasma torch to obtain core-shell particles including a core portion having barium titanate (BaTiO3) and a shell portion including the additive and formed on a surface of the core portion.