Solid Electrolyte Body for Gas Sensor
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Solution Overview
Problem
Conventional solid electrolyte bodies in gas sensors suffer from low temperature deterioration and reduced responsiveness when used in internal combustion engine exhaust gas environments, leading to potential cracking and decreased operational reliability.
Innovation Solution
A solid electrolyte body composed of partially stabilized zirconia with specific ranges of alumina and silica content in particle boundary parts, optimized to prevent cracking and maintain low temperature responsiveness, is developed. The alumina and silica components are adjusted within 0.01-1 mass % and a ratio of 0.2-2.0 in oxide content, respectively, to enhance durability and sensor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte body composition is used, then manufacturing is simpler, but low temperature responsiveness deteriorates and cracking occurs
Solution Approach 1:
The invention changes the compositional parameters of the solid electrolyte body by precisely controlling the total content of alumina and silica components (0.01-1 mass%) and their ratio (0.2-2.0). This parameter optimization resolves the contradiction by achieving both improved low temperature responsiveness and prevention of cracking, while maintaining manufacturability through defined compositional ranges rather than complex multi-component systems
Solution Approach 2:
The invention applies local quality control by specifically targeting the particle boundary parts between crystal particles for compositional optimization. By controlling the alumina and silica distribution at these critical interfaces, the invention achieves localized improvement in low temperature responsiveness and crack resistance without requiring complex changes to the entire material system
2Reliability
If alumina and silica content is increased to prevent cracking, then durability improves, but low temperature responsiveness deteriorates
Solution Approach 1:
The invention resolves this contradiction by optimizing the parameters of alumina and silica content within a specific range (0.01-1 mass% total) and controlling their ratio (0.2-2.0). This precise parameter control achieves the dual benefit of improved durability through crack prevention while maintaining fast low temperature responsiveness, avoiding the trade-off that would result from simply increasing alumina and silica content
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 optimized solid electrolyte body effectively prevents low temperature deterioration and maintains superior sensor responsiveness, ensuring reliable operation and durability in harsh environments.
Implementation Method 1
When receiving electric power, the heater section generates heat energy. The generated heat energy heats the gas sensor element, and a temperature of the gas sensor element rises.
Implementation Method 2
A gas sensor uses a solid electrolyte body having oxygen ion conductivity
Data Source
AI summary
A gas sensor has a gas sensor element which has a solid electrolyte body, a reference electrode and a measuring electrode. The solid electrolyte body contains partially stabilized zirconia as a main component in which zirconia is stabilized by stabilizer agent. Particle boundary parts are formed between crystal particles made of the partially stabilized zirconia. The particle boundary parts are made of a metal element such as yttria derived from the stabilizer agent, an alumina component and a silica component. A total content of the alumina component and the silica component in the particle boundary parts in the solid electrolyte body is within a range of 0.01 mass % to 1 mass % in terms of oxide in the solid electrolyte body. A ratio of the alumina component to the silica component in the particle boundary parts 12 is within a range of 0.2 to 2.0 in terms of oxide.