Piezoelectric ceramic bimorph coupled to thin metal plate as cooling fan for electronic devices

Yoo, Ju Hyun; Hong, Jae Il; Cao, Wenwu

doi:10.1016/s0924-4247(99)00249-6

Cited by 161 publications

(66 citation statements)

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“…Screen printable thick-film lead-zirconate-titanate (PZT) layers provide a cost-effective, simple and flexible method for many sensor and actuator applications [3][4][5]. Studies have shown [6] however, that the type 5H powder thick-film samples possess lower d 33 coefficients (10-250pC/N) than their bulk (593pC/N) counterparts, due to differences in processing and composition.…”

Section: Introductionmentioning

confidence: 99%

Improving the piezoelectric properties of thick-film PZT: the influence of paste composition, powder milling process and electrode material

Torah

Beeby

White

2004

Sensors and Actuators A: Physical

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This paper details improvements of the d 33 coefficient for thick-film Lead-Zirconate-Titanate (PZT) layers. In particular, the effect that the powder milling process has on particle size, shape and distribution has been investigated. Ball milled, jet milled and attritor milled powders were obtained from Morgan Electro-Ceramics Ltd. These powders were mixed with various ratios of lead borosilicate glass in the range of 5-20% by weight and an appropriate quantity of Electro-Science Laboratories (ESL) 400 solvent to formulate a screen printable thixotropic paste. The use of a polymer top electrode to reduce the number of firing cycles the PZT layer is subjected to was also investigated. The results show that the highest values of d 33 were obtained from the ball milled powder with 10% glass content, but the most consistent results were obtained from the attritor milled samples. The samples printed with a polymer top electrode have shown an average increase of around 15% in the value of d 33 .

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Section: Introductionmentioning

confidence: 99%

Improving the piezoelectric properties of thick-film PZT: the influence of paste composition, powder milling process and electrode material

Torah

Beeby

White

2004

Sensors and Actuators A: Physical

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“…All other geometric constants are held constant (Table 1). 2 L is varied from 3 mm to 27 mm in steps of 1 mm while p h ranges from 0.127 mm to 0.254 mm in increments of 0.0254 mm. Only the first bending mode was considered, it being the most common resonant mode used in piezoelectric fans.…”

Section: Optimization Results and Discussionmentioning

confidence: 99%

“…Piezoelectric fans were first discussed in the early seventies (Toda [1]). However the recent surge in the functionality of portable electronics devices has generated renewed interest in the use of piezoelectric fans ( [2], [3]) as a very compact, low power, noiseless air cooling technology for applications as varied as cellular phones, laptop computers and automobile multimedia boxes. Some sample configurations of piezoelectric fans demonstrating a piezoceramic bonded to a thin shimstock are shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Dynamics and topology optimization of piezoelectric fans

Bürmann

Raman

Garimella

2002

IEEE Trans. Comp. Packag. Technol.

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Piezoelectric fans are very low power, small, very low noise, solid-state devices that have recently emerged as viable thermal management solutions for a variety of portable electronics applications including laptop computers, cellular phones and wearable computers. Piezoelectric fans utilize piezoceramic patches bonded onto thin, low frequency flexible blades to drive the fan at its resonance frequency. The resonating, low frequency blade creates a streaming airflow directed at key electronics components. The optimization of a piezoelectric fan with two symmetrically placed piezoelectric patches is investigated through an analytical Bernoulli-Euler model as well as a finite element (FE) model of the composite piezo-beam. The closed form analytical solution is used to demonstrate that different optimal piezoceramic-to-blade length ratios and piezoceramic-to-blade thickness ratios exist for maximizing the electromechanical coupling factor (EMCF), tip deflection and rotation. Such optimization procedures provide simple design guidelines for the development of very-low power, high flow rate piezoelectric fans.

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“…Ces propriétés sont généralement améliorées par l'ajout d'un ou plusieurs cations qui vont se substituer au Pb 2+ en site A et/ou couple (Zr 4+ / Ti 4+ ) en site B de la structure pérovskite [2][3][4][5]. Des études menées ces dernières années ont montré que les dopants conduisent au déplacement de la frontière morphotropique.…”

Section: Introductionunclassified

The effect of addition of Nd3+ on dielectric properties of Pb[Zr0.45Ti0.45(Zn1/3, Sb2/3)0.1]O3 system

Abdessalem¹,

Boutarfaïa²,

Abba³

et al. 2015

J. Fundam and Appl Sci.

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This work aims at, to study the influence of Nd 3+ on the dielectric properties of a ceramics material of general formula: Pb[Zr0.45 Ti0.45 (Zn1/3, Sb2/3) 0.1]O3 and of structure perovskite. The selected samples were prepared by the method of synthesis with solid way. The study of the dielectric properties of the system showed that the values of the permittivity, the resistivity, increase with the addition of Nd +3 1%.

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Piezoelectric ceramic bimorph coupled to thin metal plate as cooling fan for electronic devices

Cited by 161 publications

References 0 publications

Improving the piezoelectric properties of thick-film PZT: the influence of paste composition, powder milling process and electrode material

Improving the piezoelectric properties of thick-film PZT: the influence of paste composition, powder milling process and electrode material

Dynamics and topology optimization of piezoelectric fans

The effect of addition of Nd3+ on dielectric properties of Pb[Zr0.45Ti0.45(Zn1/3, Sb2/3)0.1]O3 system

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