Multilayer Ceramic Component Electrode Glass Composition
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Solution Overview
Problem
Multilayer ceramic electronic components face reduced mechanical strength due to plating liquids infiltrating into the ceramic body and external electrodes, caused by the solubility of glass frit in the conductive paste used for forming external electrodes.
Innovation Solution
A multilayer ceramic electronic component with an external electrode composed of glass containing BaO and at least one of CaO or SrO, with a total alkaline earth oxide content ratio of 30 to 70 mol% and SiO2 content ratio of 15 to 60 mol%, which suppresses reactivity and crystallization, reducing solubility in plating liquids and enhancing mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If glass frit with high BaO and SrO content is used in conductive paste, then reactivity with ceramic body is reduced, but SiO2 content is insufficient causing glass to dissolve in plating liquid
Solution Approach 1:
The patent changes the chemical composition parameters of the glass frit by specifying a SiO2 content ratio of 15-60 mol% and alkaline earth oxide content ratio of 30-70 mol%, optimizing the balance between reactivity suppression and dissolution resistance
Solution Approach 2:
The patent creates a composite glass frit system combining multiple oxides (SiO2, BaO, SrO, CaO, B2O3, Al2O3) in specific proportions to achieve both low reactivity with ceramic body and high resistance to plating liquid dissolution
2Ease of manufacture
If glass frit with low SiO2 content is used, then manufacturing is easier, but glass dissolves easily in plating liquid causing reduced mechanical strength
Solution Approach 1:
The patent establishes specific parameter ranges for SiO2 (15-60 mol%) and alkaline earth oxides (30-70 mol%) to optimize both manufacturability and mechanical strength, preventing glass dissolution in plating liquid
3Reliability
If external electrode extends around to side surface, then electrical connection is improved, but plating liquid infiltration risk increases at interface
Solution Approach 1:
The patent applies local quality by ensuring glass is present specifically at the critical interface region between external electrode and ceramic body, providing localized protection against plating liquid infiltration where it is most needed
Solution Approach 2:
The glass acts as an intermediary substance at the interface between external electrode and ceramic body, preventing direct contact and infiltration of plating liquid while maintaining electrical connectivity
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 described configuration effectively prevents infiltration of plating liquids into the ceramic body, thereby maintaining mechanical strength and reliability of the multilayer ceramic electronic component.
Implementation Method 1
having a total content ratio of the first alkaline earth oxide and the second alkaline earth oxide in a range of 30 to 70 mol %, and (c) having an SiO2 content ratio in a range of 15 to 60 mol %... reducing solubility in plating liquids
Data Source
AI summary
A multilayer ceramic electronic component in which an interface of an edge region of an external electrode that extends around to a side surface of a ceramic body and the ceramic of the surface of the ceramic body in contact therewith, there exists glass (a) containing BaO serving as a first alkaline earth oxide and at least one of CaO and SrO serving as a second alkaline earth oxide, (b) having a total content ratio of the first alkaline earth oxide and the second alkaline earth oxide in a range of 30 to 70 mol %, and (c) having an SiO2 content ratio in a range of 15 to 60 mol %. The molar ratio of the first alkaline earth oxide to the second alkaline earth oxide is in a range of 0.1 to 0.5.