Molten-Metal Oxygen Element With Eccentric-Core Coating
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Solution Overview
Problem
Existing electrochemical oxygen sensors for molten metals suffer from slow response times, high failure rates, poor reproducibility, and low sensitivity, with needle sensors experiencing inadequate stability and mechanical weakness due to reduced coating thickness for faster response.
Innovation Solution
An oxygen detecting element with a coated pin featuring an eccentrically arranged electrically conductive core and a two-layered coating, comprising an inner reference material and outer electrolyte material, which provides a varying coating thickness for faster response and enhanced stability, allowing for efficient manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the coating thickness is reduced to achieve faster response time, then the response time is improved, but the mechanical stability and coating durability deteriorate
Solution Approach 1:
The patent applies different coating thicknesses at different locations of the sensor element. The coating is thicker at the base portion for mechanical stability and thinner at the tip portion for faster response time. This local variation in coating quality allows simultaneous optimization of both reliability and response speed without compromising either aspect.
2Loss of time
If the coating thickness is reduced to achieve faster response time, then the response time is improved, but the mechanical strength deteriorates
Solution Approach 1:
The coating is designed with non-uniform thickness distribution, being thicker at the base where mechanical strength is needed and thinner at the tip where rapid thermal response is required. This local differentiation ensures the sensor maintains sufficient mechanical strength while achieving fast response time at the sensing location.
3Ease of manufacture
If uniform coating thickness is used, then manufacturing is simplified, but response time cannot be optimized
Solution Approach 1:
The patent implements a coating with deliberately varied thickness to optimize thermal response time at the tip while maintaining manufacturability through conventional coating techniques. The non-uniform thickness is achieved through controlled coating application methods, balancing manufacturing feasibility with performance optimization.
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 solution achieves a faster response time with improved mechanical stability and reduced material usage, resulting in a cost-effective and reliable oxygen measurement in molten metals.
Implementation Method 1
an outer coating layer which covers and is in direct contact with at least a part of the inner coating and comprises an electrolyte material
Implementation Method 2
The eccentrical arrangement of the electrically conductive core in the coating leads to a variation of the thickness of the coating around the core. While the minimal thickness seemingly determines the response time of the oxygen detecting element
Data Source
Figure 1A~1F
Figure 2A~2D
Figure 3A~3D
AI summary
Oxygen detecting element comprising a coated pin. The coated pin comprises an electrically conductive core, which is eccentrically arranged in a coating. The coating comprises at least a two-layered coating section with an inner coating layer comprising a reference material and an outer coating layer comprising an electrolyte material. The invention further relates to an immersion sensor comprising the oxygen detecting element and a method for measuring the oxygen content of a metal melt with such an oxygen detecting element.