Gas-Collecting Body Surface Layer for Molten Metal Gas Measurement
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Solution Overview
Problem
Existing devices for measuring gas content in molten metal often face blockages or inadequate contact between the gas-collecting body and the molten metal, which impairs measurement accuracy.
Innovation Solution
A gas-collecting body made of materials that do not form liquid reaction products with molten metal, forming a surface layer of at least 0.3 to 5 mm thickness, primarily composed of magnesium oxide, aluminum oxide, or chromium oxide, with a spinel structure, ensuring unobstructed contact and gas exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas-collecting body made of porous stone or aluminum oxide is used, then gas exchange capability is improved, but the openings become blocked by liquid reaction products formed during contact with molten metal
Solution Approach 1:
The gas-collecting body features a surface layer (0.3-5 mm thick) with different material composition than the interior. The surface layer contains materials that do not form liquid reaction products with molten metal, while the interior can be made of cost-effective porous materials. This local differentiation prevents blockage at the metal-contact interface while maintaining gas exchange functionality.
Solution Approach 2:
The gas-collecting body is constructed as a composite structure with a surface layer containing refractory materials (such as MgO, Al2O3, Cr2O3) that are chemically inert to molten metal, combined with a porous interior structure for gas collection. This composite approach combines the chemical stability of refractory materials with the gas permeability of porous structures.
2Reliability
If the gas-collecting body surface is made of materials resistant to molten metal, then contact stability is improved, but the thickness of protective layer increases
Solution Approach 1:
The patent specifies an optimized thickness range for the surface layer (0.3-5 mm) that balances chemical protection with operational effectiveness. This parameter optimization ensures sufficient protection against chemical attack while maintaining adequate porosity and gas exchange capability throughout the gas-collecting body.
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 solution prevents blockages and ensures reliable gas exchange, allowing accurate measurement of gases like hydrogen, nitrogen, and carbon monoxide in molten steel, even in high oxygen, sulfur, magnesium, or silicon content environments.
Implementation Method 1
materials, which in contact with the molten metal do not form liquid reaction products
Implementation Method 2
the gas-collecting body is a porous body, wherein the porosity preferably equals approximately 50%
Data Source
AI summary
A device is provided for measuring the gas content in a molten metal, the device including an immersion end having a gas-collecting body, a gas supply line opening on the immersion end, and a gas discharge line for the gases passing through the gas-collecting body. The gas-collecting body contains materials, which in contact with the molten metal do not form liquid reaction products.