Screen Printed PZT Thick Films Using Composite Film Technology

Dorey, Robert; Whatmore, R. W.; Beeby, Steve; Torah, Russel; White, Neil

doi:10.1080/10584580390259065

Cited by 21 publications

(8 citation statements)

References 5 publications

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“…This is thicker than the currently possible with thin-film, solgel, piezoceramics which are limited to a maximum of about 10 mm thick due to internal stresses that build up during processing. 23 This is also thinner than commercially available bulk ceramics, which are a minimum of about 125 mm thick due to processing limitations. This size range allows the potential to embed piezoceramic transducers completely within typical adhesive layers without affecting the thickness, enabling embedding screen-printed piezoceramics into bonded and laminated structures.…”

Section: Materials Functionalizationmentioning

confidence: 99%

Recent advancements and vision toward stretchable bio-inspired networks for intelligent structures

Salowitz

Roy

Nardari

et al. 2014

Structural Health Monitoring

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Significant progress has recently been achieved in structural health monitoring, maturing the technology through quantification, validation, and verification to promote implementation and fielding of SHM. In addition, there is ongoing work seeking to detect damage precursors and to deploy structural health monitoring systems over large areas, moving the technology beyond hot-spot monitoring to global state sensing for full structural coverage. A large number of small sensors of multiple types are necessary in order to accomplish the goals of structural health monitoring, enabling increased sensing capabilities while reducing parasitic effects on host structures. Conventional sensors are large and heavy, adding to the weight of a structure and requiring physical accommodation without adding to and potentially degrading the strength of the overall structure. Increased numbers of sensors must also be deployed to span large areas while maintaining or increasing sensing resolution and capabilities. Traditionally, these sensors are assembled, wired, and installed individually, by hand, making mass deployment prohibitively time consuming and expensive. In order to overcome these limitations, the Structures and Composites Lab at Stanford University has worked to develop bio-inspired microfabricated stretchable sensor networks. Adopting the techniques of complementary metal-oxide semiconductor and microelectromechanical system fabrication, new methods are being developed to create integrated networks of large numbers of various micro-scale sensors, processors, switches, and all wiring in a single fabrication process. Then the networks are stretched to span areas orders of magnitude larger than the original fabrication area and deployed onto host structures. The small-scale components enable interlaminar installation in laminar composites or adhesive layers of built-up structures while simultaneously minimizing parasitic effects on the host structure. Additionally, data processing and interpretation capabilities could be embedded into the network before material integration to make the material truly multifunctional and intelligent once fully deployed. This article reviews the current accomplishments and future vision for these systems in the pursuit of state sensing and intelligent materials for self-diagnostics and health monitoring.

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Section: Materials Functionalizationmentioning

confidence: 99%

Recent advancements and vision toward stretchable bio-inspired networks for intelligent structures

Salowitz

Roy

Nardari

et al. 2014

Structural Health Monitoring

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“…These films can be made by the technologies of jet printing [16,17], screen printing [18,19], tape casting [20,21], dipping [22,23], hydrothermal method [24,25], etc. Here an alternative sol-gel spray technique is used [14,15,26].…”

Section: Fabrication and Characterizationmentioning

confidence: 99%

3K-1 Integrated and Flexible Piezoelectric Ultrasonic Transducers

Kobayashi

Jen

2006

2006 IEEE Ultrasonics Symposium

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Thick (>40µm) ceramic films as piezoelectric and ultrasonic transducers (UTs) have been successfully deposited on metallic and non-metallic substrates by a spray technique. In the film fabrication a composite consisting of piezoelectric powders well mixed with solution of high dielectric constant is directly sprayed onto the substrate. It is then dried, fired or annealed by heat. Multiple coating is used to achieve preferred thicknesses. A corona poling is utilized to achieve the piezoelectricity of the film. The top electrode is accomplished by a painting method. All fabrication processes can be carried out on-site and by handheld devices. Integrated ultrasonic longitudinal, shear, surface and plate wave transducers have been made. The same technology has been also used to fabricate flexible transducers consisting of a thin substrate, a piezoelectric ceramic film and electrodes. The flexibility is realized owing to the porosity of piezoelectric film and the thinness of the piezoelectric film, substrate and electrodes. All transducers have been tested at least up to 150°C. Their applications for non-destructive testing of different materials are demonstrated. Keywords-piezoelectric/ultrasonic transducers; high temperature, bulk, surface and plate wave transducers, nondestructive testing, flexible transducer 1119 ©

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“…Screen printing has been developed as a means of mass producing small-scale piezoceramic transducers, spanning thicknesses, and enabling geometries that cannot be achieved by other fabrication methods. Thin film fabrication methods like sol-gel and sputter coating are limited to thicknesses smaller than about 10 mm due to internal stresses that build up during fabrication (Dorey et al, 2003;Omori et al, 2001). Bulk ceramics are limited to thicknesses greater than about 100 mm and basic geometries due to machining and handling capabilities.…”

Section: Introductionmentioning

confidence: 99%

“…This unique trait of porous piezoceramics is used in the hydrophone field where it is advantageous, but it is detrimental to the functionality of traditional parallel plate piezoelectric transducers in many applications, like piezoelectric wafer active sensors (PWAS) in SHM. Previous efforts to overcome this issue have focused on reducing the void fraction through sol-infusion or introduction of fillers (Dorey et al, 2003) and demonstrated limited success.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of radially polarized screen-printed piezoelectric transducers

Salowitz

Kim

Kopsaftopoulos

et al. 2016

Journal of Intelligent Material Systems and Structures

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Piezoelectric transducers have applications from ultrasonic structural health monitoring to micro-electromechanical systems. Small physical size coupled with large actuation is desirable in many applications, requiring unique transducer designs to take advantage of the material properties. Screen-printed piezoceramics were developed as a means of mass producing mezzo-scale transducers that are geometrically small and light weight, but large enough to generate significant actuation. Screen-printed piezoceramic transducers display significantly different properties than chemically identical bulk ceramic elements, largely attributed to high void fraction of screen-printed piezoceramic materials and detrimental to the functionality of traditional transducer designs. This article presents analysis, simulation, and initial testing of new designs for screen-printed piezoceramic transducers with concentric through-thickness electrodes. Analytical models were developed enabling analysis across material properties and design parameters. Analytical results were verified against finite element models for some designs. Prototypes were created and underwent initial testing to assess the properties of the design.

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Screen Printed PZT Thick Films Using Composite Film Technology

Cited by 21 publications

References 5 publications

Recent advancements and vision toward stretchable bio-inspired networks for intelligent structures

Recent advancements and vision toward stretchable bio-inspired networks for intelligent structures

3K-1 Integrated and Flexible Piezoelectric Ultrasonic Transducers

Design and analysis of radially polarized screen-printed piezoelectric transducers

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