Graphene-Polymer Ultrasound Transducer Backing for Low-Frequency Attenuation
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Solution Overview
Problem
Existing ultrasound transducers face challenges with backing blocks that are not thermally conductive, have low attenuation at low frequencies, and poor mechanical strength, often using composite materials like polymer matrices with metallic particles.
Innovation Solution
Incorporating graphene flakes or sheets into a polymer matrix backing block to enhance thermal conductivity and mechanical strength, providing high attenuation and impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If porous graphite or metal foam is used to provide high thermal conductivity, then thermal conductivity is improved, but attenuation at low frequencies deteriorates
Solution Approach 1:
The patent uses a composite material consisting of a polymer matrix combined with graphene sheets. The polymer matrix provides acoustic attenuation while the graphene sheets provide thermal conductivity, creating a composite that simultaneously achieves both properties without the drawbacks of traditional porous graphite or metal foam structures.
2Strength
If polymer matrix with metallic particles is used, then mechanical strength is improved, but thermal conductivity deteriorates
Solution Approach 1:
The patent replaces metallic particles with graphene sheets in the polymer matrix composite. Graphene provides superior thermal conductivity compared to metallic particles while maintaining the mechanical strength benefits of the composite structure, thus resolving the contradiction between mechanical strength and thermal conductivity.
Solution Approach 2:
The patent changes the thermal conductivity parameter of the polymer matrix by incorporating graphene sheets, which have high thermal conductivity. This parameter change transforms the polymer-composite from having low thermal conductivity to having high thermal conductivity while preserving mechanical strength.
3Ease of manufacture
If conventional backing materials are used, then ease of manufacture is maintained, but performance at low frequencies deteriorates
Solution Approach 1:
The patent uses a polymer-graphene composite that maintains ease of manufacture through standard polymer processing techniques while achieving superior low-frequency attenuation performance. The graphene sheets are incorporated into the polymer matrix, allowing the material to be processed using conventional methods without requiring complex manufacturing procedures.
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 graphene-enhanced backing blocks offer improved thermal conductivity, mechanical stability, and acoustic attenuation, enhancing the performance of ultrasound transducers, particularly at low frequencies.
Implementation Method 1
Graphene, such as flakes or sheets, is used in backers with a matrix of polymer. The graphene provides good attenuation at low frequencies and thermal conductivity.
Implementation Method 2
The graphene provides good attenuation at low frequencies and thermal conductivity.
Data Source
AI summary
For ultrasound transducers. graphene, such as flakes or sheets, is used in backers with a matrix of polymer. The graphene provides good attenuation at low frequencies and thermal conductivity.