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High-dielectric constant lead-free piezoelectric ceramic composition and its use

A technology of ceramic composition and high dielectric constant, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve problems such as large resonance impedance, large driving electric field, and impractical application. To achieve the effect of favorable design and wide bandwidth

Inactive Publication Date: 2007-09-05
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the vibrator is made, the resonance impedance is large, and the driving electric field required is large, so it cannot be practically applied

Method used

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  • High-dielectric constant lead-free piezoelectric ceramic composition and its use
  • High-dielectric constant lead-free piezoelectric ceramic composition and its use
  • High-dielectric constant lead-free piezoelectric ceramic composition and its use

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Embodiment 1-50

[0016] The general process of ceramics is to bake the raw material oxides or carbonates of each component at 120°C for 3h-8h, then mix according to stoichiometry, use zirconia balls as the ball milling medium, and mix in the vibrating mill for 3h-12h. Then press it into a φ45-55mm block with a pressure of 50Mpa, and synthesize the ceramic clinker commonly known in this industry at 900-1100°C for 2-14h. Then the synthetic material (ie clinker) is ball milled in a vibration mill for 6h-24h. Then dry it, add a binder to granulate it and dry press it into a green body (relative density 58-62%) with 100Mpa. The green body is debinded at 800°C for 2h-14h at 0.5-4°C / min (relative density 52-54%), and then fired at 1165-1195°C for 0.5-14h. The relative density of the green body after firing is above 95%. Finally, after the silver electrode is applied, it is polarized (100-200° C., 5-8 kV / mm, time 20-30 minutes), and the piezoelectric ceramic element is made. Its main performance pa...

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Abstract

A non-lead piezoelectric ceramic composition with high dielectric constant used for preparing the vibrating sheet of piezoelectric ceramic resonator, filter and vibrator is a 5-layer ceramics. Its chemical formula is Sr2-xM1xBi4Ti5-yM2y0.8+ delta MnO2, where x=0-1, y=0-1, M1 is chosen from Mg, Ca, Ba, La, Pr, Nd, Sm, Gd, Dy, Er, Yb, Sc and Y, M2 is chosen from Nb, Ta, W, Mo and V, and delta=0-1.5%.

Description

technical field [0001] The invention relates to a high dielectric constant lead-free piezoelectric ceramic composition and a piezoelectric vibrating piece made of the composition. Specifically, the present invention relates to a piezoelectric ceramic composition that can be used as a piezoelectric ceramic resonator, filter, and piezoelectric ceramic vibrator and a piezoelectric vibrating piece made of the composition, belonging to piezoelectric The field of ceramic materials and devices. Background technique [0002] At present, the widely used piezoelectric materials are mainly lead zirconate titanate PZT (PbZrO) with perovskite structure. 3 -PbTiO 3 solid solution) or lead titanate PT (PbTiO 3 ). They are widely used in piezoelectric ceramic resonators, filters, and piezoelectric ceramic vibrators. However, lead zirconate titanate or lead titanate contains a large amount of toxic substance lead oxide PbO (generally the content can reach 60-80wt%). Regardless of the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01H01L41/187H10N30/853
Inventor 郑嘹赢李国荣殷庆瑞童元丰陶锋烨张火荣
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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