Ternary piezoelectric material with high curie temperature and preparation method

A Curie temperature, piezoelectric material technology, applied in the field of piezoelectric materials and preparation, can solve the problems of harsh process conditions, low piezoelectric performance, high cost, etc., to achieve no special equipment and harsh conditions, excellent performance, improved pressure. The effect of electrical properties

Inactive Publication Date: 2013-12-25
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the piezoelectric properties of these high-temperature piezoelectric single crystal materials are too low, and the piezoelectric constant d 33 No more than 20pc / N, the sensitivity of the output charge far meets the actual needs, coupled with the harsh process conditions, complex technology and high cost of piezoelectric single crystal production, usually when there is no other choice, they are forced to choose them

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  • Ternary piezoelectric material with high curie temperature and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: According to the material composition A: 0.65BiFeO 3 -0.05LiNbO 3 -0.30PbTiO 3 +0.02molCeO 2 +0.02molSb 2 o 3 The molar stoichiometric ratio is used for batching, and the analytically pure raw material Bi is weighed 2 o 3 , Fe 2 o 3 , Li 2 CO 3 、TiO 2 , Nb 2 o 5 , CeO 2 and Sb 2 o3 , put it into a ball mill jar, the ball mill medium is absolute alcohol and zirconia balls, the weight ratio of material: ball: alcohol is 2:1:0.5, ball mill 6h, the rotating speed is 600 rpm, after drying the mixture, Put it into a corundum crucible for compaction, cover and seal it, and keep it warm in a muffle furnace at a temperature of 900°C for 2 hours. After coarse crushing and grinding, put the synthesized block into a ball mill jar, and grind it with zirconia balls and distilled water. Medium, material: the weight ratio of ball: water is 2:1:1, the ball mill is 12 hours, the speed is 600 rpm, after the powder is dried, add PVA (polyvinyl alcohol) with a weig...

Embodiment 2

[0025] Example 2: According to the material composition B: 0.70BiFeO 3 -0.02LiNbO 3 -0.28PbTiO 3 +0.01molCeO 2 +0.01molSb 2 o 3 The molar stoichiometric ratio is used for batching, the pre-firing synthesis temperature is 800°C, and the temperature is kept for 6 hours. mm, the polarization time is 20 minutes, and all the other processes are the same as in Example 1; the performance of the element tested after placing it for 48 hours is: piezoelectric constant d 33 =122pC / N, electromechanical coupling coefficient kp=0.36, Qm=160, Curie temperature Tc=645℃;

Embodiment 3

[0026] Embodiment 3: Composition C by material:

[0027] 0.62BiFeO 3 -0.10LiNbO 3 -0.28PbTiO 3 +0.03molCeO 2 +0.05molSb 2 o 3 The stoichiometric ratio is used for batching, the pre-sintering synthesis temperature is 1000°C, heat preservation for 1h, sintering temperature is 1260°C, heat preservation for 3 hours, oil bath polarization is carried out in dimethyl silicone oil at 140°C, and the polarization voltage is 5000V / mm, Polarization time is 30 minutes, and all the other processes are identical with embodiment 1; The component performance tested after placing 48 hours is: piezoelectric constant d 33 =185pC / N, electromechanical coupling coefficient kp=0.45, Qm=60, Curie temperature Tc=605℃;

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Abstract

A chemical formula of a ternary piezoelectric material with a high curie temperature is (1-x-y)BiFeO3-xLiNbO3-yPbTiO3+amolCeO2+bmolSb2O3, wherein x is equal to 0.02-0.10, y is equal to 0.28-0.35, a is equal to 0.01-0.05, and b is equal to 0.01-0.05. A preparation method of the ternary piezoelectric material comprises the steps of weighing analytically pure substance powder in the formula according mass mole numbers in the chemical formula for first ball milling, presintering, synthesizing and grinding for second ball milling after the first ball milling and drying, performing pelleting, plastic removal, sintering, machining, electrode treatment, oil bath polarization in dimethicone on powder of the second ball milling, and cleaning to form a ternary piezoelectric material element. The ternary piezoelectric material is greater than 120pC/N in d33, is up to 0.45 in kp, exceeds 600 DEG C in Tc, and can meet a piezoelectric device application in a hot environment, a technology is simple, the cost is low, and the scale production is facilitated.

Description

technical field [0001] The invention belongs to the piezoelectric material and its preparation in the field of sensors, in particular to a ternary piezoelectric material with a high Curie temperature and its preparation method, more precisely to a piezoelectric material with a high Curie temperature and good piezoelectric properties Piezoelectric materials and preparation methods. Background technique [0002] In recent years, with the rapid development of science and technology, there are increasingly urgent requirements for the development of high-temperature piezoelectric materials in many fields such as petroleum exploration, aerospace, chemical metallurgy, automobiles, and nuclear power generation. For example, vibration control of aircraft engines, non-destructive detection of liquid metal pipelines, high-temperature flow detection and control of steel and chemical industry heating networks, power grids and nuclear power industries, and non-destructive flaw detection o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 温建强
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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