PbTiO<sub>3</sub>/Pb(Zr,Ti)O<sub>3</sub>sol–gel composite for ultrasonic transducer applications

Inoue, Tatsuo; Kobayashi, Makiko

doi:10.7567/jjap.53.07kc11

Cited by 23 publications

(22 citation statements)

References 20 publications

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“…After 737 s, it started to decrease until a cycle time of 957 s. One may notice that the pattern of the temperature in Figure 10 is similar to the inverse of the ultrasonic velocity in Figure 9 . This phenomenon may be explained according to Morath and Maris's research results [ 20 ]. They presented that the ultrasonic velocity and polymer (PMMA) temperature had the following relationship in their experimental conditions:

where v m was the ultrasonic velocity in the polymer (PMMA), T was the temperature (K) and the applied temperature range was from 80 to 300 K. The similar phenomenon could also be observed from the research results of Ono et al [ 21 ].…”

Section: Resultsmentioning

confidence: 99%

Novel Real-Time Temperature Diagnosis of Conventional Hot-Embossing Process Using an Ultrasonic Transducer

Cheng

Yang

Lee

2014

Sensors

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This paper presents an integrated high temperature ultrasonic transducer (HTUT) on a sensor insert and its application for real-time diagnostics of the conventional hot embossing process to fabricate V-cut patterns. The sensor was directly deposited onto the sensor insert of the hot embossing mold by using a sol-gel spray technique. It could operate at temperatures higher than 400 °C and uses an ultrasonic pulse-echo technique. The ultrasonic velocity could indicate the three statuses of the hot embossing process and also evaluate the replication of V-cut patterns on a plastic plate under various processing conditions. The progression of the process, including mold closure, plastic plate softening, cooling and plate detachment inside the mold, was clearly observed using ultrasound. For an ultrasonic velocity range from 2197.4 to 2435.9 m/s, the height of the V-cut pattern decreased from 23.0 to 3.2 μm linearly, with a ratio of −0.078 μm/(m/s). The incompleteness of the replication of the V-cut patterns could be indirectly observed by the ultrasonic signals. This study demonstrates the effectiveness of the ultrasonic sensors and technology for diagnosing the replicating condition of microstructures during the conventional hot embossing process.

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Section: Resultsmentioning

confidence: 99%

Novel Real-Time Temperature Diagnosis of Conventional Hot-Embossing Process Using an Ultrasonic Transducer

Cheng

Yang

Lee

2014

Sensors

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“…The corona discharge was used because it could apply high electrical fields without dielectric breakdown. In a previous study, poling of PT was difficult at room temperature because PT has a high coercive electric field [13]. Thus the poling was performed at sufficiently high temperature because the thermal vibration of molecules at high temperature could promote domain wall shifting, namely poling.…”

Section: Sample Fabricationmentioning

confidence: 99%

“…PZT powder has high piezoelectric constant, however, the dielectric constant of PZT powder was higher than that of the PZT sol-gel phase, 1100-1300 [12]. Therefore, PbTiO 3 (PT) powder was considered as a good candidate for sol-gel composite material [13], and even by stencil printing, because it had reasonable piezoelectric constant, low dielectric constant, and a high Curie temperature ~490 °C. In this study, PT/PZT thick film fabrication by paint stencil printing was attempted.…”

Section: Introductionmentioning

confidence: 99%

Sol-gel composite film fabrication by paint stencil printing

Kaneko

Iwata

Kobayashi

2014

2014 IEEE International Ultrasonics Symposium

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Piezoelectric ceramics by sol-gel composites could be useful as ultrasonic transducers in real industry fields. For solgel composite film fabrication, spray coating technique has been used frequently because of adaptability for various substrates. However, spray coating method requires multiple spray coating processes and heating processes and it is an anxious issue, particularly for on-site fabrication under controlled area. Paint stencil printing has been developed in order to solve the above issue because this method enables to fabricate thick sol-gel composite films by one coating process. In this study, PbTiO 3 (PT)/ Pb(Zr,Ti)O 3 (PZT) films were fabricated by paint stencil printing and spray coating technique, and thermal cycle test between room temperature and 300q qC was operated for both samples in order to compare ultrasonic performance and adhesive strength. As a result, sensitivity and signal-to-noise-ratio (SNR) of ultrasonic response by stencil printing were equivalent with those by spray technique. Therefore, PT/PZT films fabricated by paint stencil printing could be a good candidate as ultrasonic transducers for non-destructive testing (NDT) from room temperature to 300 °C.

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“…Aerosol deposition (AD) has been studied to fabricate PZT thick films by consolidation of submicron-ceramic particles on substrate at room temperature [6]. Composite film (ComFi) technique utilizes the combination of PZT powder and sol-gel processing to produce PZT thick film [7,8], which was introduced to fabricate PZT thick film with the thickness of tens of micrometres.…”

Section: Introductionmentioning

confidence: 99%