Hydrogen Sensor Probe for Molten Metals

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Solution Overview

Problem

Existing methods for measuring hydrogen concentration in molten metals, particularly in aluminum and its alloys, face challenges such as lack of accuracy, cumbersome apparatus, and long measurement times, and have not been developed for practical shop-floor use in foundries.

Innovation Solution

A hydrogen sensor probe with a proton-conducting solid-electrolyte sensor and an internal solid-state hydrogen reference, integrated into a probe body with a hydrogen-permeable seal and a measurement electrode, allowing for rapid and accurate hydrogen concentration measurement by generating a reference partial pressure and using the reverse current technique.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional hydrogen concentration measurement methods are used in molten metals, then measurement capability is provided, but measurement time becomes excessively long and accuracy is insufficient

Engineering Contradiction:

Improvehydrogen concentration measurement accuracyVSAvoidmeasurement time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces traditional mechanical/chemical measurement methods with an electrochemical sensor system. A proton-conducting solid electrolyte sensor generates an electrical potential difference proportional to hydrogen concentration, enabling rapid and accurate measurements without lengthy chemical analysis procedures.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the measurement parameter from slow chemical reactions to fast electrochemical potential differences. By measuring voltage rather than waiting for chemical equilibrium, the system achieves both speed and accuracy in hydrogen concentration determination.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If conventional hydrogen sensing apparatus are deployed, then hydrogen detection is enabled, but the apparatus becomes cumbersome and unsuitable for shop-floor use

Engineering Contradiction:

Improvehydrogen detection capabilityVSAvoidapparatus complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the measurement system into two parts: a simple, robust probe that can be easily immersed in molten metal, and a separate analyser unit that processes signals. This segmentation allows the probe to be shop-floor ready while maintaining detection reliability through the analyser.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a proton-conducting solid electrolyte as an intermediary between the molten metal and the measurement system. This intermediary enables hydrogen detection without requiring direct contact between complex apparatus and the harsh molten metal environment.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If existing hydrogen measurement technology is implemented, then measurement function is achieved, but the system lacks robustness for repeated immersion in molten metals

Engineering Contradiction:

Improvemeasurement throughputVSAvoidrobustness for repeated use

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent uses a thin proton-conducting solid electrolyte membrane that allows hydrogen protons to pass through while protecting the internal reference electrode. This thin-film structure enables rapid hydrogen equilibration for fast measurements while the robust external probe housing provides mechanical strength for repeated immersion.

Inventive Principle:

Principle #30Flexible shells and thin films

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 provides a robust, compact, and accurate hydrogen concentration measurement system with rapid response times, suitable for repeated immersion in molten metals, reducing costs and improving operational efficiency in foundry settings.

Implementation Method 1

The solid reference material generates a reference partial pressure of hydrogen within the cavity

Methodology Applied

Scientific EffectHydrogen reference generation:

Implementation Method 2

hydrogen from the melt diffuses through the seal and generates a partial pressure of hydrogen within the chamber

Methodology Applied

Scientific EffectHydrogen diffusion: Diffusion

Implementation Method 3

proton-conducting solid-electrolyte sensor

Methodology Applied

Scientific EffectProton conduction: Conduction (electrical)

Data Source

PatentUS8152978B2Apparatus and method for measuring hydrogen concentration in molten metals

Publication Date: 2012.04.10 ENVIRONMENTAL MONITORING & CONTROL

AI summary

The present invention concerns a probe for measuring hydrogen concentration in molten metals comprising a probe body and a hydrogen sensor. The sensor structure is based on a sensor body having a wall within which a sealed cavity is defined. The cavity contains a solid reference material for generating a reference partial pressure of hydrogen within the cavity. At least a portion of the wall of the cavity is formed from a solid electrolyte material carrying a measurement electrode on a surface of the solid electrolyte outside the cavity and a reference electrode on a surface of the solid electrolyte within the cavity, exposed to the reference partial pressure of hydrogen. An electrical conductor extends from the reference electrode through the wall of the cavity to an external surface of the sensor body. The probe body comprises a chamber for receiving the sensor and a reference-signal connection for connecting to the electrical conductor when the sensor is received in the chamber.