Composite Waveguides for High-Temperature Metal Ultrasound
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Solution Overview
Problem
Existing ultrasound systems for processing liquid metals and alloys face limitations due to the low operating temperature of piezoelectric transducers, which result in high thermal gradients and material fatigue, leading to short sonotrode lifespan and limited vibration intensity, especially at high temperatures.
Innovation Solution
An ultrasound system utilizing a composite waveguide made of a metallic and/or ceramic matrix with fibrous reinforcement, where mechanical vibrations are excited transverse to the fibers, enabling high resistance to fatigue and damping at elevated temperatures, and optionally coated with metallic materials for improved wettability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If piezoelectric transducers are used to generate ultrasound vibrations, then high frequency vibrations can be achieved, but the operating temperature is limited to below the melting point of most metals
Solution Approach 1:
The patent introduces an intermediate coupling system consisting of a piezoelectric transducer connected to a mechanical amplifier (lever system or cam mechanism) that drives the sonotrode. This intermediary mechanical amplification system allows the piezoelectric transducer to operate at lower temperatures while still generating high-frequency vibrations at the sonotrode surface, resolving the temperature-frequency contradiction.
2Productivity
If the sonotrode surface temperature is maintained above the melting temperature of the alloy, then stable ultrasound liquid metal processing occurs, but the thermal gradient causes low life-span of the sonotrode
Solution Approach 1:
The patent applies local quality by creating a thermal gradient distribution where the sonotrode surface maintains high temperature for processing stability, while the bulk of the sonotrode and coupling mechanisms remain cooler. This localized heating approach, combined with material selection and cooling strategies, extends sonotrode lifespan while maintaining processing stability.
3Temperature
If high-melting metals are used for waveguides operating at high temperature, then temperature resistance is improved, but strength decreases significantly after exceeding 1/2 of homologous temperature
Solution Approach 1:
The patent employs composite materials for the sonotrode, combining materials with high melting points and good high-temperature strength characteristics. The composite structure allows optimization of both temperature resistance and mechanical strength, overcoming the limitation of pure high-melting metals that lose strength significantly above half their homologous temperature.
4Temperature
If engineering ceramics are used for waveguides, then high temperature resistance is achieved, but brittleness and low tensile strength limit vibration amplitude
Solution Approach 1:
The patent uses composite material designs that incorporate ceramic components for high-temperature resistance while combining them with more ductile materials to maintain adequate tensile strength and vibration amplitude capability. This composite approach overcomes the brittleness limitation of pure engineering ceramics.
5Ease of manufacture
If metallic waveguides are used for low melting point materials, then ease of manufacture is achieved, but maximum operating temperature is limited to about 1000 K due to material limitations and fatigue
Solution Approach 1:
The patent transitions from pure metallic waveguides to composite waveguide structures that incorporate high-temperature resistant materials. This composite design maintains manufacturing feasibility while extending the maximum operating temperature capability beyond 1000 K, overcoming the temperature limitation of conventional metallic waveguides.
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 system achieves high amplitude vibrations and extended lifespan at temperatures up to 2000°C, suitable for applications like liquid metal atomization and degasification, with improved wettability and resistance to thermal degradation.
Implementation Method 1
Typically, the ultrasound system is excited by a piezoelectric or a magnetostrictive transducer
Implementation Method 2
the ultrasound system requires applying high-efficiency cooling or moving away the transducer from a heat source
Implementation Method 3
in a system, in which they are atomized by subjecting them to an action of an vibrating waveguide which serves a function of a sonotrode
Implementation Method 4
Typical applications include powders atomization, degasification and alloying of metals and their alloys
Data Source
AI summary
An ultrasound system for processing of liquid metal and their alloys, comprising at least one ultrasound transducer and at least one composite waveguide made of a composite material comprising a reinforcement and a matrix. The ultrasound transducer is coupled with the composite waveguide so that during operation it excites a standing wave of mechanical vibrations in the composite waveguide. According to the invention, the matrix comprises a metallic and/or ceramic material whereas the reinforcement comprises fibers of metallic and/or ceramic material. Mechanical vibrations are transverse to the fibers of the reinforcement material. A method of processing of materials, in which material is melted and the melted material is subjected to the operating of a vibrating waveguide in the ultrasound system, characterized in that the ultrasound system according to the invention is used.