A kind of piezoelectric material with high Curie point and preparation method thereof

Abstract

The invention discloses a high Curie point piezoelectric material and a preparation method thereof, according to BaCO 3 60‑65 parts, CaCO 3 3-7 parts, TiO 2 25‑30 parts, ZrO 2 1‑5 parts, SnO 2 1‑5 servings, Sm 2 o 3 0‑0.08 parts, Li 2 CO 3 0.4‑0.8 parts Weigh each raw material, use deionized water as the ball milling medium, ball mill the mixture for 6‑12 hours, dry until completely dry, pass through a 50‑2000 mesh sieve; Room temperature; then use deionized water as the ball milling medium, after ball milling for 6-12 hours, dry until completely dry, and pass through a 50-2000 mesh sieve; add 5-8% of the total weight of the binder, at 10-30Mpa Press it into a disc with a diameter of 10mm; keep it warm at 1000-1200°C for 4 hours, cool it down to room temperature naturally with the furnace, take it out, and coat it with silver paste on both sides. o C Burn silver for 10‑30 minutes, and then perform polarization treatment to obtain a piezoelectric material with a high Curie point. The invention has excellent electrical performance, high Curie point, energy saving and environmental protection.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a high Curie point piezoelectric material, and also to a preparation method of the high Curie point piezoelectric material. Background technique [0002] Piezoelectric materials are crystalline materials that generate voltage between the two ends when subjected to pressure. The application fields can be roughly divided into two categories: vibration energy and ultrasonic vibration energy-electric energy transducer applications, including electro-acoustic transducers, Underwater acoustic transducers and ultrasonic transducers, etc., and other sensor and driver applications. Most of the piezoelectric materials used in the market are lead-based piezoelectric materials PZT; as we all know, PZT devices will cause lead pollution in various links such as production, application, and recycling, which will endanger human health; in addition, lead-based piezoelectric materials are being ...

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Problems solved by technology

Qi et al. by adding Bi 2 o 3 and Li 2 CO 3 The prepared composite sintering aid reduces the sintering temperature, but the requirement of the process for the particle size of the raw material powder is nanometer level, which increases the material cost; Yao et al. 0.85 Ca 0.15 Ti 0.9 Zr 0.1 -xSn x Doping SnO in Environmentally Friendly Piezoelectric Ceramics 2 , which greatly improves the electrical properties of environmentally friendly piezoelectric ceramics, but the sintering temperature in the preparation process is as high as 1350 ° C, and the Curie temperature is low, the highest is only about 60 ° C; Cui et al. 0.85 Ca 0.15 Zr 0.1 Ti 0.9 o 3 Doping Sm in lead-free piezoelectric ceramics 2 o 3 Increased Curie temperature, but only to 95°C

With the increasingly diversified and complex requirements of piezoelectric ceramic components, the existing barium calcium zirconate titanate Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 o 3 The electrical properties of environmentally friendly piezoelectric ceramics can no longer meet the requirements

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