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Method for preparing potassium sodium niobate base leadless piezoelectric ceramic

A potassium sodium niobate-based, lead-free piezoelectric technology, applied in the field of functional materials, can solve problems such as few reports, and achieve the effect of simple and easy preparation process, excellent piezoelectric and ferroelectric properties, and good repeatability

Inactive Publication Date: 2008-05-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the improvement of the preparation method of the potassium-sodium niobate-based ceramic system is mostly limited to the issue of preventing the volatilization of alkali metals, and there are few reports on how to improve its sintering process.

Method used

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  • Method for preparing potassium sodium niobate base leadless piezoelectric ceramic
  • Method for preparing potassium sodium niobate base leadless piezoelectric ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Na with a purity of 99.8% 2 CO 3 , a purity of 99.5% K 2 CO 3 , a purity of 99.5% Li 2 CO 3 , Nb with a purity of 99.9% 2 o 5 , according to the chemical formula (Li 0.06 Na 0.52 K 0.42 )NbO 3For batching, use a planetary ball mill to mix and ball mill for 10 hours at a speed of 100 rpm, and pre-fire at 700°C for 6 hours to synthesize ceramic powder. Sintering with two-step sintering process: heat up to 850°C at 30°C / min, then heat up to 1050°C at 10°C / min, hold for 2 minutes, then drop to 950°C at 20°C / min, hold for 10 hours, and then cool to room temperature .

[0035] Compared with the traditional method, the electrical properties of the prepared niobate-based lead-free piezoelectric ceramics are:

[0036] d 33 (pC / N)

Embodiment 2

[0038] Na with a purity of 99.8% 2 CO 3 , a purity of 99.5% K 2 CO 3 , a purity of 99.5% Li 2 CO 3 , Nb with a purity of 99.9% 2 o 5 , MgO with a purity of 98% according to the chemical formula 0.99(Li 0.06 Na 0.52 K 0.42 )NbO 3 +0.01MgO for batching, mixed and ball milled for 3 hours with a planetary ball mill at a speed of 450rpm, and pre-fired at 800°C for 3 hours to synthesize ceramic powder. Sintering with two-step sintering process: heat up to 900°C at 30°C / min, then rise to 1100°C at 10°C / min, hold for 5 minutes, then drop to 1000°C at 20°C / min, hold for 15 hours, and then cool to room temperature .

[0039] Compared with the traditional method, the electrical properties of the prepared niobate-based lead-free piezoelectric ceramics are:

[0040] d 33 (pC / N)

Embodiment 3

[0042] Na with a purity of 99.8% 2 CO 3 , a purity of 99.5% K 2 CO 3 , a purity of 99.5% Li 2 CO 3 , Nb with a purity of 99.9% 2 o 5 , MgO with a purity of 98% according to the chemical formula 0.95(Li 0.06 Na 0.52 K 0.42 )NbO 3 +0.05MgO for batching, mixed and ball milled with a planetary ball mill for 7 hours at a speed of 350rpm, and pre-fired at 750°C for 4 hours to synthesize ceramic powder. Sintering with two-step sintering process: heating up to 950°C at 30°C / min, then rising to 1150°C at 10°C / min, holding for 10 minutes, then lowering to 1050°C at 20°C / min, holding for 18 hours, and then cooling to room temperature .

[0043] Compared with the traditional method, the electrical properties of the prepared niobate-based lead-free piezoelectric ceramics are:

[0044] d 33 (pC / N)

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Abstract

The invention discloses potassium-solium niobate leadless piezoelectric ceramics and a preparation method thereof, and pertains to the functional material field. A chemical constituent of the material is (1-x) (Li0.06Na0.52K0.42)NbO3+xRO, wherein, x is more than or equal to 0 and less than or equal to 0.02, and the RO is metallic oxide. The invention adopts two steps sintering method to produce the potassium-solium niobate leadless piezoelectric ceramics under strictly controlling sinter temperature and the speed of raising temperature; the first step is that temperature raises to 850 - 950 DEG C at a speed of 30 DEG C per minute; the second step is that the temperature is raised to between 1050 and 1150 DEG C at a speed of 10 DEG C per minute and 2 to 10 minutes for insulation; the temperature lowers to 950 - 1050 DEG C at a speed of 20 DEG C per minute and 10 to 20 hours for insulation, and then the temperature is lowered to room temperature; after the steps, the novel piezoelectric ceramics is finally made; compared with the traditional sintering technique, the piezoelectric constant d33 is raised by 10 to 20 percent.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a preparation method of potassium sodium niobate-based lead-free piezoelectric ceramics, in particular to a doping modification of an oxide RO (R is one of Mg, Ca, Ba, and Sr) (Li, Na, K)NbO 3 (LNKN) potassium sodium niobate based lead-free piezoelectric ceramic material and its preparation process. Background technique [0002] Since the appearance of piezoelectric ceramic materials in the 1940s, people have attracted great attention. At present, their applications have spread to all fields of society and all aspects of people's lives. With the advancement of science and technology, people's requirements for materials are not limited to their performance. The deterioration of the ecological environment forces people to focus on the environmental effects of materials. In the development process of piezoelectric ceramics, lead-based piezoelectric ceramics (PZT) is currently the...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622
Inventor 张波萍李海涛尚鹏鹏
Owner UNIV OF SCI & TECH BEIJING
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