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Lead-free piezoelectric ceramic for medical ultrasonic transducer as well as preparation method and application of lead-free piezoelectric ceramic

An ultrasonic transducer, lead-free piezoelectric technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the long heating and cooling time , high equipment cost, difficult industrial production and other problems, to achieve the effect of reducing sintering temperature, improving production efficiency and excellent performance

Pending Publication Date: 2021-03-12
HUNAN HANDLIKE MINIMALLY INVASIVE SURGERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the performance of the piezoelectric ceramics prepared by these methods has basically reached the level of PZT, the equipment cost of these methods is very expensive, the heating and cooling time is long, the efficiency is low, resulting in high production costs, and it is difficult to industrialize production.

Method used

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  • Lead-free piezoelectric ceramic for medical ultrasonic transducer as well as preparation method and application of lead-free piezoelectric ceramic
  • Lead-free piezoelectric ceramic for medical ultrasonic transducer as well as preparation method and application of lead-free piezoelectric ceramic
  • Lead-free piezoelectric ceramic for medical ultrasonic transducer as well as preparation method and application of lead-free piezoelectric ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A preparation method of lead-free piezoelectric ceramics for medical ultrasonic transducers, the process is as follows:

[0050] A. Formulation design: according to 0.96(K 0.5 Na 0.5 )NbO 3 -0.04Bi 0.5 Na 0.5 ZrO 3 (wt.%) stoichiometric ratio with the raw material Na 2 CO 3 、K 2 CO 3 , Nb 2 o 5 、 Bi 2 o 3 , ZrO 2 ;

[0051] B. Ultrasonic irradiation: Dry the weighed raw materials and put them into a beaker together with ethanol. The mass ratio of raw materials and ethanol is 1:1. Ultrasonic irradiation treatment is carried out in the ultrasonic irradiation equipment. Among them, the irradiation time is 0.5h, the irradiation temperature is 90°C, and the irradiation power is 30w;

[0052] C. Drying & sieving: the irradiated powder is kept in a drying oven at 80°C for 12 hours, and then passed through an 80-mesh sieve;

[0053] D. Calcination: put the sieved powder into a corundum crucible, and calcinate in a sintering furnace to synthesize a pre-calcined p...

Embodiment 2

[0059]A preparation method of lead-free piezoelectric ceramics for medical ultrasonic transducers, the process is as follows:

[0060] A. Formulation design: according to 0.94(K 0.5 Na 0.5 )NbO 3 +0.06Bi 0.5 Na 0.5 ZrO 3 (wt.%) stoichiometric ratio with the raw material Na 2 CO 3 、K 2 CO 3 , Nb 2 o 5 、 Bi 2 o 3 , ZrO 2 ;

[0061] B. Ultrasonic irradiation: Dry the weighed raw materials and put them into a beaker together with ethanol. The mass ratio of raw materials and ethanol is 1:1. Ultrasonic irradiation treatment is carried out in the ultrasonic irradiation equipment. Among them, the irradiation time is 1h, the irradiation temperature is 70°C, and the irradiation power is 40w;

[0062] C. Drying & sieving: the irradiated powder is kept in a drying oven at 80°C for 12 hours, and then passed through an 80-mesh sieve;

[0063] D. Calcination: put the sieved powder into a corundum crucible, and calcinate in a sintering furnace to synthesize a pre-calcined powd...

Embodiment 3

[0070] A preparation method of lead-free piezoelectric ceramics for medical ultrasonic transducers, the process is as follows:

[0071] A. Formulation design: according to 0.92(K 0.5 Na 0.5 )NbO 3 +0.08Bi 0.5 Na 0.5 ZrO 3 (wt.%) stoichiometric ratio with the raw material Na 2 CO 3 、K 2 CO 3 , Nb 2 o 5 、 Bi 2 o 3 , ZrO 2 ;

[0072] B. Ultrasonic irradiation: Dry the weighed raw materials and put them into a beaker together with ethanol. The mass ratio of raw materials and ethanol is 1:1. Ultrasonic irradiation treatment is carried out in the ultrasonic irradiation equipment. Among them, the irradiation time is 0.5h, the irradiation temperature is 90°C, and the irradiation power is 30w;

[0073] C. Drying & sieving: the irradiated powder is kept in a drying oven at 80°C for 12 hours, and then passed through an 80-mesh sieve;

[0074] D. Calcination: put the sieved powder into a corundum crucible, and calcinate in a sintering furnace to synthesize a pre-calcined p...

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Abstract

The invention discloses lead-free piezoelectric ceramic for a medical ultrasonic transducer as well as a preparation method and application of the lead-free piezoelectric ceramic, the lead-free piezoelectric ceramic is Bi0.5Na0.5ZrO3 doped K0.5Na0.5NbO3 ceramic, and the mass fraction of Bi0.5Na0.5ZrO3 in the lead-free piezoelectric ceramic is less than or equal to 10%. The preparation method comprises the following steps: weighing the raw materials according to a stoichiometric ratio according to a design formula to obtain a mixture, adding the mixture into an organic solvent to obtain slurry,carrying out ultrasonic irradiation, performing drying and sieving on the slurry to obtain undersize, performing calcining to obtain pre-sintered powder, carrying out ball milling, granulation and compression molding on the pre-sintered powder to obtain a green body, and finally carrying out plasma sintering to obtain lead-free piezoelectric ceramic. According to the preparation method, an ultrasonic irradiation powder treatment technology is combined with a spark plasma sintering technology, and the preparation method has the advantages of being excellent in comprehensive performance, environmentally friendly, high in production efficiency, capable of easily achieving batch production and the like, can well meet commercial requirements and is very suitable for preparing lead-free KNN-based piezoelectric ceramic products.

Description

technical field [0001] The invention relates to a preparation method of a piezoelectric ceramic, in particular to a lead-free piezoelectric ceramic for a medical ultrasonic transducer and its preparation method and application. Background technique [0002] Ultrasound refers to sound waves with a frequency greater than 20KHz. Because of its good directionality and strong penetrating power, it has been widely used in many medical fields such as ultrasonic scalpel surgery, ultrasonic atomization, B-ultrasound examination, and ultrasonic pharmaceuticals. Compared with traditional surgery, ultrasonic scalpel surgery has the advantages of high cutting precision, small trauma, good coagulation effect, clearer field of vision, greatly shortened operation time, and faster postoperative recovery, bringing great benefits to both doctors and patients. Ultrasonic scalpel equipment is mainly composed of high-frequency power source and ultrasonic vibration system. The ultrasonic vibratio...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622H01L41/187H01L41/39H01L41/43
CPCC04B35/495C04B35/622C04B2235/3201C04B2235/3244C04B2235/3298C04B2235/6562C04B2235/6567C04B2235/666H10N30/8542H10N30/093H10N30/097
Inventor 李益民王霄
Owner HUNAN HANDLIKE MINIMALLY INVASIVE SURGERY CO LTD
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