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Sodium-potassium niobate series substituted by bismuth-base calcium-titanium ore and preparing method

A potassium sodium niobate, lead-free piezoelectric technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., to improve piezoelectric and electromechanical coupling performance, reduce sintering temperature, and improve sintering The effect of density

Inactive Publication Date: 2007-08-29
SENBA SENSING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no research report on the electrical properties and preparation process of lead-free piezoelectric ceramics based on bismuth-based perovskite substituted potassium sodium niobate series in the existing literature.

Method used

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  • Sodium-potassium niobate series substituted by bismuth-base calcium-titanium ore and preparing method
  • Sodium-potassium niobate series substituted by bismuth-base calcium-titanium ore and preparing method
  • Sodium-potassium niobate series substituted by bismuth-base calcium-titanium ore and preparing method

Examples

Experimental program
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Effect test

preparation example Construction

[0045] The specific steps of the preparation method are:

[0046] 1. Take Na 2 CO 3 , K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 , Ta 2 o 5 , Sb 2 o 5 , Bi 2 o 3 , Fe 2 o 3 , Sc 2 o 3 , Al 2 o 3 And metal oxide and carbonate for doping are raw materials, according to formula (1) batching;

[0047] 2. The prepared raw materials are mixed with absolute ethanol for 6-18 hours, and then dried to obtain dry powder; the obtained dry powder is calcined in an alumina crucible at a temperature of 800-950°C for 2-6 hours; repeated ball milling The mixing and calcination process is done once to complete the pre-calcination synthesis;

[0048] 3. After the pre-synthesized powder is ground, it is still finely ground for 24 hours with absolute ethanol as the medium. After the dried powder passes through a 120 mesh sieve, it is formed into a green body under a pressure of 50-200MPa;

[0049] 4. The formed green body is sintered in the air under normal pressure by buried powder met...

Embodiment 1

[0052] Embodiment 1: Carry out each step successively according to above-mentioned embodiment mode, wherein,

[0053] Using (1-n)(Na 0.5 K 0.5 )NbO 3 +nBiFeO 3 For the piezoelectric ceramics composed of , the pre-calcination temperature is 900° C. and the time is 5 hours. After two calcinations, ball mill again for 24 hours with absolute ethanol as the ball milling medium. The formed body is then sintered in the range of 1080-1130° C. for 2 hours.

[0054] The scanning electron micrograph of the natural surface of the sample with n=0.01 after sintering at 1100°C for 2 hours is shown in Figure 1, and its dielectric-temperature characteristic curve is shown in Figure 2.

[0055] The X-ray diffraction patterns of the two composition samples when n=0.01 and 0.02 are shown in FIG. 3 .

[0056] The density changes of samples with different n sintered under three different temperature conditions are shown in Figure 4.

[0057] When n=0.01 and the sintering temperature is 1100°...

Embodiment 2

[0060] Embodiment 2: Carry out each step successively according to above-mentioned embodiment mode, wherein

[0061] Using (1-n)(Na 0.5 K 0.5 )NbO 3 +nBiScO 3 And n=0.02 is the piezoelectric ceramic whose composition is, the pre-calcination condition is 850° C., and the time is 6 hours. After two calcinations, ball mill again for 24 hours with absolute ethanol as the ball milling medium. Then the molded green body was sintered at 1110°C for 3 hours. The scanning electron microscope photo of the natural surface of the sample is shown in Figure 5, and the dielectric-temperature characteristic curve of the sample is shown in Figure 6. Other relevant physical performance data are listed in Table 2:

[0062] Table 2

[0063] density

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Abstract

The invention relates to a potassium niobate natrium series leadless piezoelectric ceramics and the manufacturing method. It is expressed by the general equation: (1-u)[(1-n)(LitNa1-w-t1Kw-t2)(Nb1-g-fTagSbf)O3+nBiMeO3]+uM. The invention has stable manufacturing technology and has great usefulness.

Description

technical field [0001] The invention relates to lead-free piezoelectric ceramics and a preparation method thereof, more specifically to potassium-sodium niobate series lead-free piezoelectric ceramics and a preparation method thereof. Background technique [0002] Since the 1960s, piezoelectric ceramics with lead zirconate titanate (Pb(Zr,Ti)O3) as the main component have been widely used in many fields such as electronics, aerospace, communication, and military affairs. For example, piezoelectric ceramics are made into various filters, oscillators, notch filters and other electronic components. However, the content of lead oxide or trilead tetroxide in these piezoelectric ceramic materials accounts for more than 70%. These lead-containing piezoelectric ceramics will bring serious harm to human health and the living environment during use and disposal. [0003] Sodium bismuth titanate is a lead-free ferroelectric ceramic with a perovskite structure that was studied earlier...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622H01L41/187H10N30/853
Inventor 左如忠
Owner SENBA SENSING TECH CO LTD
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