High curie point piezoelectric material and preparation method thereof

Abstract

The invention discloses a high curie point piezoelectric material and a preparation method thereof. The preparation method comprises the following steps: weighing the following raw materials in partsby weight: 60-65 parts of BaCO3, 3-7 parts of CaCO3, 25-30 parts of TiO2, 1-5 parts of ZrO, 1-5 parts of SnO, 0-0.08 part of Sm2O3 and 0.4-0.8 part of Li2CO3; with deionized water as a ball milling medium, performing ball milling on the mixed material for 6-12 h, drying the material completely, and sieving the dried mixed material through a 50-2000-mesh screen; calcining the mixture at 950-1100 DEG C for 3-4 hours, and cooling the calcined material to room temperature along with the furnace; then with deionized water as a ball milling medium, performing ball milling for 6-12 hours, then dryingthe mixture completely, and sieving the mixture through a 50-2000-mesh sieve; adding an adhesive accounting for 5-8% of the total weight of the raw materials, and pressing the raw materials into a wafer with the diameter of 10 mm under the pressure of 10-30 Mpa; keeping the temperature at 1000-1200 DEG C for 4 hours, and naturally cooling the material to room temperature along with the furnace, taking out the material, coating two sides with silver paste, burning silver at 600-800 DEG C for 10-30 minutes, and performing polarization treatment to obtain the high-curie-point piezoelectric material. The material is excellent in electrical property, high in curie point, energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a piezoelectric material with a high Curie point and a method for preparing the piezoelectric material with a high Curie point. Background technique [0002] Piezoelectric materials are crystalline materials that generate a voltage between their 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 electroacoustic transducers, Hydroacoustic 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 in the pre...

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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-x sn 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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