Ultrasonic Probe Gas Outlets for Molten Metal Degassing
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Solution Overview
Problem
Current methods for reducing dissolved gases and impurities in molten metals, such as hydrogen in aluminum and copper baths, are inefficient and often require costly, hazardous materials like chlorine gas, which poses environmental concerns and complexity.
Innovation Solution
The use of ultrasonic devices with integrated gas delivery systems that introduce purging gases like argon or nitrogen near the ultrasonic probe tips in molten metal baths, creating cavitation bubbles to effectively remove dissolved gases and impurities, while materials like niobium are used to enhance device durability and reduce reactivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional gas purging methods are used to remove dissolved gases from molten metal, then gas removal capability is provided, but the process requires hazardous materials like chlorine gas and becomes complex and environmentally problematic
Solution Approach 1:
The patent extracts the harmful chlorine gas from the degassing process and replaces it with inert gases like argon or nitrogen. The gas delivery system is integrated into the ultrasonic probe, delivering purging gas directly to the cavitation zone where dissolved gases are removed from the molten metal without requiring hazardous chemicals.
Solution Approach 2:
The ultrasonic field acts as an intermediary mechanism that enables gas removal without direct chemical reaction. By creating cavitation bubbles that collapse and release dissolved gases, the ultrasonic energy mediates the degassing process, eliminating the need for chlorine gas while maintaining effective gas removal capability.
2Productivity
If devices are placed in molten metal baths for processing, then metal production and casting can be performed, but the devices suffer from short lifetime due to high temperature and reactivity
Solution Approach 1:
The probe is constructed from inert materials such as niobium, tantalum, or ceramic coatings that resist chemical reaction with molten metal. These materials create an inert interface between the device and the aggressive molten metal environment, preventing degradation and extending device lifetime while maintaining continuous production capability.
Solution Approach 2:
The ultrasonic probe employs composite construction with different materials optimized for specific functions: the core provides structural integrity, while protective coatings or cladding layers resist thermal and chemical attack. This composite approach allows the device to withstand the harsh molten metal environment for extended periods.
3Productivity
If ultrasonic devices are used for degassing, then gas removal efficiency is improved, but the devices need to withstand extremely high temperatures which limits material choices and increases complexity
Solution Approach 1:
The probe utilizes inert materials like niobium, tantalum, or ceramic coatings that maintain structural integrity and chemical stability at molten metal temperatures (700-1200°C). These materials resist oxidation and reaction with the molten metal, allowing the ultrasonic device to operate effectively for degassing without material degradation.
Solution Approach 2:
The ultrasonic probe employs composite construction with different materials optimized for specific functions: the core provides structural integrity, while protective coatings or cladding layers resist thermal and chemical attack. This composite approach allows the device to withstand the harsh molten metal environment for extended periods.
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 method significantly reduces dissolved gas content by up to 80% and impurity levels, such as sodium, by more than 95%, improving the quality of metal products and extending the lifespan of equipment in contact with molten metals.
Implementation Method 1
introducing a purging gas into the molten metal bath in close proximity to the ultrasonic device... creating cavitation bubbles to effectively remove dissolved gases and impurities
Implementation Method 2
a gas delivery system, the gas delivery system comprising a gas inlet, a gas flow path through the probe, and a gas outlet at or near the tip of the probe
Data Source
AI summary
Ultrasonic probes containing a plurality of gas delivery channels are disclosed, as well as ultrasonic probes containing recessed areas near the tip of the probe. Ultrasonic devices containing these probes, and methods for molten metal degassing using these ultrasonic devices, also are disclosed.