Acoustic properties of particle/polymer composites for ultrasonic transducer backing applications

Grewe, M.G.; Gururaja, T.R.; Shrout, Thomas R.; Newnham, R. E.

doi:10.1016/0963-8695(92)90387-v

Cited by 16 publications

(26 citation statements)

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“…The apparent densities of the composites were measured by Archimedes' method and their relative densities were obtained from the theoretical values by the mixing rule [4]. The microstructures of the composites were observed by scanning electron microscopy (SEM, JSM-6500F, JEOL, Japan).…”

Section: Methodsmentioning

confidence: 99%

“…Preliminary results showed that ZnWO 4 and ZnMoO 4 have low sintering temperatures (ZnWO 4 = 1000 • C, ZnMoO 4 = 800 • C) and high values of quality factor (Q ( 1/tan δ) × f (resonant frequency); ZnWO 4 = 54,300 GHz, ZnMoO 4 = 34,000 GHz). Therefore, these ceramics were examined as fillers for composites to investigate their effects on the microwave dielectric properties of the resulting composites.…”

Section: Introductionmentioning

confidence: 98%

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Effect of Connectivity on Microwave Dielectric Properties of Low Loss Ceramics Filled PTFE Composites

Jeon

Kim

2012

Ferroelectrics

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Effects of connectivity patterns on the dielectric properties of polytetrafluoroethylene (PTFE) composites filled with low-lossZn-based ceramics (ZnWO 4 , ZnMoO 4 ) were investigated at microwave frequencies. The dielectric constant (K), dielectric loss (tan δ) and temperature coefficient of resonant frequency (TCF) of the 0-3 connectivity composites were dependent on the type and amount of ceramics. For the composites with 0.2 volume fraction (V f ) of ZnMoO 4 , the K and tan δ increased with number of connectivity and internal strain, respectively. Typical results of K = 2.99, tan δ = 3.155×10 −3 and TCF = 0 ppm/ • C were obtained for the 0-2 connectivity composites with 0.2 V f of ZnMoO 4 .

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Effect of Connectivity on Microwave Dielectric Properties of Low Loss Ceramics Filled PTFE Composites

Jeon

Kim

2012

Ferroelectrics

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“…Meanwhile, higher volume of ethanol above 1 mL might affect the cross-linking of epoxy, leading to the increased degree of crystallinity of epoxy due to longer aging time, thus causing the worse acoustic attenuation. 1 Basically, higher crystallinity of polymers will result in relatively higher stress and lower strain.…”

Section: Morphology and Compositionsmentioning

confidence: 99%

Hierarchical Assembly of Tungsten Spheres and Epoxy Composites in Three-Dimensional Graphene Foam and Its Enhanced Acoustic Performance as a Backing Material

Qiu

Liu

et al. 2016

ACS Appl. Mater. Interfaces

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Backing materials play important role in enhancing the acoustic performance of an ultrasonic transducer. Most backing materials prepared by conventional methods failed to show both high acoustic impedance and attenuation, which however determine the bandwidth and axial resolution of acoustic transducer, respectively. In the present work, taking advantage of the structural feature of 3D graphene foam as a confined space for dense packing of tungsten spheres with the assistance of centrifugal force, the desired structural requirement for high impedance is obtained. Meanwhile, superior thermal conductivity of graphene contributes to the acoustic attenuation via the conversion of acoustic waves to thermal energy. The tight contact between tungstate spheres, epoxy matrix, or graphene makes the acoustic wave depleted easily for the absence of air barrier. The as-prepared 3DG/W80 wt %/epoxy film in 1 mm, prepared using ∼41 μm W spheres in diameter, not only displays acoustic impedance of 13.05 ± 0.11 MRayl but also illustrates acoustic attenuation of 110.15 ± 1.23 dB/cm MHz. Additionally, the composite film exhibits a high acoustic absorption coefficient, which is 94.4% at 1 MHz and 100% at 3 MHz, respectively. Present composite film outperforms most of the reported backing materials consisting of metal fillers/polymer blending in terms of the acoustic impedance and attenuation.

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“…Thus, smaller particle size will result in an overall increase in the particle contact surface areas at the same volume. At the particle interface, part of wave will be transmitted and part of wave will be reflected [13].…”

Section: Influence Of Bt Particle Size On the Acoustic Impedancementioning

confidence: 99%

Influence of barium titanate content and particle size on electromechanical coupling coefficient of lead-free piezoelectric ceramic-Portland cement composites

Rianyoi

Potong

Ngamjarurojana

et al. 2013

Ceramics International

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Acoustic properties of particle/polymer composites for ultrasonic transducer backing applications

Cited by 16 publications

References 0 publications

Effect of Connectivity on Microwave Dielectric Properties of Low Loss Ceramics Filled PTFE Composites

Effect of Connectivity on Microwave Dielectric Properties of Low Loss Ceramics Filled PTFE Composites

Hierarchical Assembly of Tungsten Spheres and Epoxy Composites in Three-Dimensional Graphene Foam and Its Enhanced Acoustic Performance as a Backing Material

Influence of barium titanate content and particle size on electromechanical coupling coefficient of lead-free piezoelectric ceramic-Portland cement composites

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