Ultrasonic Transducers Made From Freeze-Cast Porous Piezoceramics

Rymansaib, Zuhayr; Kurt, Polat; Zhang, Yan; Roscow, James; Bowen, Christopher R.; Hunter, Alan J.

doi:10.1109/tuffc.2022.3144521

Cited by 7 publications

(3 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We can observe the presence of pores of different sizes (dendrite‐like) on the lamellar structure as well 62 . This is formed by a sublimation of small curing crystals, accumulation of particles, removal of additives, and so on 63,64 . The lamellar structure becomes less and less obvious with increasing ceramic content.…”

Section: Resultsmentioning

confidence: 98%

“…62 This is formed by a sublimation of small curing crystals, accumulation of particles, removal of additives, and so on. 63,64 The lamellar structure becomes less and less obvious with increasing ceramic content. When the content is 55 wt.%, almost no lamellar structure is observed, which indicates that the excessive solid-phase content is not conducive to the formation of lamellar composites.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Rheological, mechanical, and electrical properties of Sr_0.7Bi_0.2TiO₃ modified BaTiO₃ ceramic and its composites

et al. 2023

View full text Add to dashboard Cite

Porous BaTiO3‐based relaxor ferroelectric ceramics with lamellar structure were achieved by ice templating method, and the rheological properties of ceramic slurry for freeze casting were deeply studied. Epoxy resin was then backfilled to generate ceramic–epoxy resin composites. Ceramic–epoxy composites with a lamellar structure were obtained when using a slurry with a ceramic content of 45 wt.%. The nanoindentation results showed that the introduction of ceramic materials into the epoxy resin can significantly improve the penetration resistance and hardness of the material. The dielectric and ferroelectric properties of the composites were also characterized. The interaction between the highly coupled dipoles in the polymers results in a decrease in the breakdown field strength of the composite. The dielectric constant reached up to ∼800. At 220 kV/cm, Wrec = 0.62 J/cm3, and η was ∼80%. At low frequencies, Wrec was ∼0.16 J/cm3, which indicated good stability.

show abstract

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Rheological, mechanical, and electrical properties of Sr_0.7Bi_0.2TiO₃ modified BaTiO₃ ceramic and its composites

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Recently, with the increasing desires of high-sensitivity and large source-level transducers, transducers highly require the large-area and conformal surface piezoelectric elements for the purpose of improving the transmitting voltage response, − expanding the detection range and broadening bandwidth. In the past decades, piezoelectric ceramics have obtained a good deal of success in the field of acoustic transducers, − but their limited electromechanical coupling properties and impedance matching issues cannot fulfill the ever-increasing requirements of broadband acoustic transducers. , …”

Section: Introductionmentioning

confidence: 99%

Conformally Large-Area Single-Crystal Piezocomposites with High Performance for Acoustic Transducers

Jia

Wang

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Large-area and conformal piezoelectric elements are highly desired for acoustic transducers to possess a large power source level and wide detecting range. To date, single-crystal piezocomposites attract much attention on enhancing the power source level and bandwidth for next-generation acoustic transducers, owing to their higher piezoelectric and electromechanical coupling properties compared to traditional piezocomposites. Unfortunately, it is still challenging to achieve large-area and conformal single-crystal piezocomposites because of the fragile nature, large anisotropy, and the limited grown size of piezoelectric single crystals. Here, we successfully fabricate the conformally large-area single-crystal piezocomposite with an area of 160 × 50 mm 2 and a bending angle of 162°by a modified 3D-printingassisted inserting method. The single-crystal piezocomposite exhibits a high thickness electromechanical coupling factor k t of 85% and a large piezoelectric coefficient d 33 of 1150 pC/N, surpassing those of the reported large-area piezocomposites. The influence of the volume fraction and curvature radius of single-crystal PCs and acoustic transducers was investigated. Furthermore, we designed an acoustic transducer based on the conformal single-crystal piezocomposite. Benefiting from the excellent piezoelectric and electromechanical properties of the single-crystal piezocomposite, the transducer indicates a high maximum transmitting voltage response of 171.8 dB. Especially, its bandwidth (−3 dB) achieves 60 kHz with a resonant frequency of 292 kHz, which is about 1.8 times superior to the conformal acoustic transducer based on the ceramic piezocomposite with a similar resonant frequency. This work may benefit the future design and fabrication of high-performance and complex-shape piezoelectric composites as key materials for next-generation transducers.

show abstract

Freeze-cast porous Al2O3/MgO ceramics as potential acoustic sound absorption

da N. Guenka,

Machado,

Silva

et al. 2024

Applied Acoustics

View full text Add to dashboard Cite

Ultrasonic Transducers Made From Freeze-Cast Porous Piezoceramics

Cited by 7 publications

References 30 publications

Rheological, mechanical, and electrical properties of Sr_0.7Bi_0.2TiO₃ modified BaTiO₃ ceramic and its composites

Rheological, mechanical, and electrical properties of Sr_0.7Bi_0.2TiO₃ modified BaTiO₃ ceramic and its composites

Conformally Large-Area Single-Crystal Piezocomposites with High Performance for Acoustic Transducers

Freeze-cast porous Al2O3/MgO ceramics as potential acoustic sound absorption

Contact Info

Product

Resources

About

Ultrasonic Transducers Made From Freeze-Cast Porous Piezoceramics

Cited by 7 publications

References 30 publications

Rheological, mechanical, and electrical properties of Sr0.7Bi0.2TiO3 modified BaTiO3 ceramic and its composites

Rheological, mechanical, and electrical properties of Sr0.7Bi0.2TiO3 modified BaTiO3 ceramic and its composites

Conformally Large-Area Single-Crystal Piezocomposites with High Performance for Acoustic Transducers

Freeze-cast porous Al2O3/MgO ceramics as potential acoustic sound absorption

Contact Info

Product

Resources

About

Rheological, mechanical, and electrical properties of Sr_0.7Bi_0.2TiO₃ modified BaTiO₃ ceramic and its composites

Rheological, mechanical, and electrical properties of Sr_0.7Bi_0.2TiO₃ modified BaTiO₃ ceramic and its composites