Dielectric Ceramic Composition Stabilizing Breakdown Voltage
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Solution Overview
Problem
Dielectric ceramic compositions with BaO-rare earth oxide-TiO2-based compounds face issues with variation in breakdown voltage due to segregation of conductive particles like Ag, leading to reduced lifespan of high-frequency electronic devices, especially thin-layer capacitors.
Innovation Solution
A dielectric ceramic composition with a specific formula {α(xBaO.yNd2O3.zTiO2)+β(2MgO.SiO2)} as the main component, along with minor components like zinc oxide, boron oxide, a glass with a softening point of 570°C or less, and silver, optimized within specific molar and mass ratios to stabilize the breakdown voltage and improve electric properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BaO-rare earth oxide-TiO2-based compound is used as main component to achieve high relative permittivity and low-temperature sintering, then electric properties are improved, but breakdown voltage variation increases due to Ag segregation
Solution Approach 1:
The patent introduces a glass component with specific softening point (400-600°C) as an intermediary substance that mediates between the dielectric ceramic matrix and Ag conductive particles. This glass phase acts as a barrier to Ag segregation while maintaining low-temperature sintering, thereby suppressing breakdown voltage variation caused by composition non-uniformity
Solution Approach 2:
The patent changes the chemical composition parameters by adding specific amounts of ZnO (0.1-5.0 wt%), B2O3 (0.1-5.0 wt%), and glass (0.1-5.0 wt%) to the BaO-rare earth oxide-TiO2-based system. These parameter changes modify the sintering behavior and Ag distribution, reducing breakdown voltage variation while maintaining high relative permittivity
2Ease of manufacture
If Ag is used as internal conductor to reduce cost and resistance, then manufacturing cost and electrical resistance are improved, but breakdown voltage variation increases
Solution Approach 1:
The glass component with softening point of 400-600°C serves as a mediator between Ag particles and the dielectric matrix. It prevents excessive Ag segregation during sintering, ensuring uniform Ag distribution that maintains low resistance while reducing breakdown voltage variation
Solution Approach 2:
The patent creates a composite system combining BaO-rare earth oxide-TiO2-based dielectric ceramic with Ag conductive particles and glass modifiers. This composite structure allows Ag to be used as internal conductor for cost reduction while the glass phase ensures reliability by preventing Ag segregation-induced breakdown voltage variation
3Temperature
If low-temperature sintering is used to enable Ag as internal conductor, then manufacturing temperature is reduced, but composition uniformity deteriorates leading to breakdown voltage variation
Solution Approach 1:
The patent modifies the sintering system by adding ZnO, B2O3, and glass components that lower the sintering temperature to 900-1100°C. These additive changes improve Ag distribution uniformity at low temperatures, preventing breakdown voltage variation that would otherwise occur due to composition non-uniformity
Solution Approach 2:
The glass phase with softening point of 400-600°C acts as an intermediary that facilitates uniform Ag particle distribution during low-temperature sintering. It prevents Ag segregation even at reduced sintering temperatures, maintaining composition uniformity while enabling cost-effective Ag-based internal conductors
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 composition achieves stable electric properties and reduced variation in breakdown voltage, enabling reliable high-frequency device performance without the need for high sintering temperatures, thus enhancing the lifespan and reliability of electronic components.
Implementation Method 1
a glass having a softening point of 570° C. or less
Implementation Method 2
low-temperature sintering properties
Data Source
AI summary
To provide a dielectric ceramic composition which is free from variation in breakdown voltage, and has excellent electric properties. The dielectric ceramic composition according the present invention includes: as a main component, a component represented by a composition formula {α(xBaO-yNd2O3-zTiO2)+β(2MgO—SiO2)}, wherein x, y, and z representing a molar ratio of the BaO Nd2O3, and TiO2 are each in a specific molar ratio range, and α and β representing a volume ratio of each component, zinc oxide, boron oxide, a glass having a softening point at a specific temperature or less, and silver, wherein a, b, c, and d representing a mass ratio of each of the minor components based on the main component are each in a specific mass ration range.