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Thermal stable sodium niobate-based lead-free piezoelectric ceramic and preparation method thereof

A technology based on lead-free piezoelectric and sodium niobate, which is applied in the field of functional ceramic materials, can solve the problems of insufficient industrial application, insufficient temperature stability of piezoelectric and electromechanical coupling performance of potassium sodium niobate system, and influence on the surface of thick film process ceramics Quality and other issues, to achieve the effect of reducing the sintering temperature and improving the piezoelectric performance

Inactive Publication Date: 2018-10-23
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the room-temperature piezoelectric properties of mainstream systems have made great breakthroughs in recent years and are even comparable to lead zirconate titanate systems, there are still many problems to be solved in the large-area industrial application of lead-free piezoelectric ceramics.
Taking the most potential potassium sodium niobate-based lead-free piezoelectric ceramics with high piezoelectric response and high Curie temperature as an example, it has been developed rapidly in recent years, and at room temperature it has obtained a performance almost comparable to that of lead zirconate titanate-based ceramics. Piezoelectric performance, but it is still not able to achieve a wide range of industrial applications
Because these lead-free compositions have the essential properties of polymorphic phase boundaries, the problem of insufficient temperature stability of the piezoelectric and electromechanical coupling properties of the potassium sodium niobate system has not been effectively resolved.
In addition, the crystal grain morphology of potassium sodium niobate-based lead-free ceramics is mostly polygonal particles, which is different from traditional lead-containing piezoelectric ceramics, which affects the thick film process and the surface quality of ceramic chips

Method used

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  • Thermal stable sodium niobate-based lead-free piezoelectric ceramic and preparation method thereof
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  • Thermal stable sodium niobate-based lead-free piezoelectric ceramic and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] a. Raw material: 5.6280g Na 2 CO 3 , 2.3681g BaCO 3 , 0.4429g SrCO 3 , 13.9550g Nb 2 o 5 , 0.9585gTiO 2 , 0.3697g ZrO 2

[0031] b. The above-mentioned prepared raw materials are mixed with alcohol as a medium by ball milling for 6 hours; the wet powder is dried to obtain a mixed powder;

[0032] c. Place the obtained mixed powder in an alumina crucible for calcination and synthesis at a synthesis temperature of 900 o C, heat preservation for 4 hours; repeat the ball mill mixing and calcination process once to complete the pre-calcination synthesis;

[0033] d. After the pre-synthesized powder is ground, it is still ball-milled with alcohol as the medium for 12 hours. After the dried powder passes through a 100-mesh sieve, it is cold-pressed under a pressure of 100 MPa to form a circle with a diameter of 10 mm and a thickness of 1 mm. sheet to obtain a ceramic green body;

[0034] e. The obtained ceramic green body is sintered in the air under normal pressure ...

Embodiment 2

[0039] Carry out each step sequentially according to the above-mentioned embodiment mode, wherein adopt (1-z)[0.8625NaNbO 3 +0.1BaTiO 3 +0.0375SrZrO 3 ]+zCuO is composed of piezoelectric ceramics, the pre-calcination temperature is 900 o C. The time is 4 hours. After two calcinations, ball mill again for 24 hours with absolute ethanol as the ball milling medium. Then the formed green body is at 1200-1300 o C in the range of sintering for 2 hours. The X-ray diffraction pattern of the sample when z=0, 0.0025, 0.005, 0.01, 0.015 and 0.02 is as follows Figure 4 shown.

[0040] Sample at 1250 when z=0.005 o The scanning electron micrographs of the natural surface after sintering at C for 2 hours are as follows Figure 5 As shown, the morphology of the grains is spherical. Other physical properties of the measured sample: the Curie temperature is 83 o C, the dielectric constant is 2800 (1kHz), the piezoelectric constant is 270 pC / N, the planar electromechanical coupling c...

Embodiment 3

[0042] a. Raw material: 5.5962g Na 2 CO 3 , 3.0785g BaCO 3 , 13.8753g Nb 2 o 5 , 0.9585g TiO 2 , 0.4436gZrO 2

[0043] b. The above-mentioned prepared raw materials are mixed with alcohol as a medium by ball milling for 6 hours; the wet powder is dried to obtain a mixed powder;

[0044] c. Place the obtained mixed powder in an alumina crucible for calcination and synthesis at a synthesis temperature of 900 o C, heat preservation for 4 hours; repeat the ball mill mixing and calcination process once to complete the pre-calcination synthesis;

[0045] d. After grinding the obtained pre-synthesized powder, still use alcohol as the medium to ball mill for 12 hours. After the dried powder passes through a 100-mesh sieve, it is cold-pressed under a pressure of 100 MPa to form a circle with a diameter of 10 mm and a thickness of 1 mm. sheet to obtain a ceramic green body;

[0046] e. The obtained ceramic green body is sintered in the air under normal pressure using the buried...

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Abstract

The invention relates to a thermal stable sodium niobate-based lead-free piezoelectric ceramic and a preparation method thereof. The composition is shown as a general formula of (1-z)[(1-x-y)NaNbO3+xMI+yABO3]+zMII; in addition, the x is greater than 0.08 but smaller than 0.15; the y is greater than 0 but smaller than 0.1; the z is greater than 0 but smaller than 0.1; the MII is one or several kinds of metal oxides. The thermal stable sodium niobate-based lead-free piezoelectric ceramic belongs to the field of a functional ceramic material. The ceramic can be obtained by using a conventional piezoelectric ceramic preparation technology and by using industrial raw materials; the prepared sodium niobate-based lead-free piezoelectric ceramic composition has good piezoelectric performance, goodtemperature stability and good process stability, can realize the replacement on partial conventional lead-containing piezoelectric ceramic, and has the practicability.

Description

technical field [0001] The invention relates to a heat-stable sodium niobate-based lead-free piezoelectric ceramic and a preparation method thereof, belonging to the field of functional ceramic materials. Background technique [0002] Piezoelectric ceramics are information functional ceramic materials that can convert mechanical energy and electrical energy to each other. In addition to piezoelectricity, they also have dielectric properties and elasticity. They have been widely used in medical imaging, acoustic sensors, and acoustic transducers. , ultrasonic motor, etc. Lead zirconate titanate-based piezoelectric ceramic materials are currently dominant in the market. This is due to the quasi-isomorphic phase boundary with the coexistence of trigonal and tetragonal phases, which makes these lead-based phase boundary materials have excellent piezoelectric properties with temperature stability. . However, the use of these materials usually uses a large amount of lead, which ...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/3201C04B2235/3213C04B2235/3215C04B2235/3234C04B2235/3236C04B2235/3248C04B2235/3281C04B2235/3298
Inventor 左如忠祁核
Owner HEFEI UNIV OF TECH
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