Ternary piezoceramic material with high Curie temperature and preparation method thereof
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A technology of piezoelectric ceramics and temperature range, applied in the field of ternary high Curie temperature piezoelectric ceramic materials and its preparation
Inactive Publication Date: 2014-07-30
SHANGHAI UNIV
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Its high Curie temperature makes this material have the potential to be used in high-temperature piezoelectric field, but its moderate piezoelectric constant still needs to be further improved
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Embodiment 1
[0016] Component selection: (1-y)((1-x)BF-xPT)-yPMN, y=0.04, x=0.3. The content of lead niobium manganate in the third component is 4%, and the ratio of bismuth ferrite and lead titanate is 7:3.
[0017] A. Preparation of 0.96(0.7BF-0.3PT)-0.04PMN green body
[0018] (1) Preparation of powder
[0019] With analytically pure Bi 2 o 3 , Fe 2 o 3 , PbO, TiO 2 , MnCO 3 and Nb 2 o 5 As a raw material, weigh the above-mentioned raw materials according to the stoichiometric ratio required for the preparation of 50 g 0.96(0.7BF-0.3PT)-0.04PMN and put them into a ball mill jar, then add 24 ml of deionized water and 1.5 ml of ammonia water as a solvent and weight as a raw material Zirconia beads with a weight of 0.8 to 1.5 times were used as a ball milling medium, and rolled for 24 hours. After ball milling, pour the ball mill slurry into a clean porcelain bowl, put it in a constant temperature oven at 120 ℃ and dry it, then grind the powder finely, put it in a crucible for ca...
Embodiment 2
[0028] Component selection: (1-y)((1-x)BF-xPT)-yPMN, y=0.08, x=0.35. The content of lead niobium manganate in the third component is 8%, and the ratio of bismuth ferrite and lead titanate is 13:7.
[0029] A. Preparation of 0.92(0.65BF-0.35PT)-0.08PMN green body
[0030] (1) Preparation of powder
[0031] With analytically pure Bi 2 o 3 , Fe 2 o 3 , PbO, TiO 2 , MnCO 3 and Nb 2 o 5 As a raw material, weigh the above raw materials according to the stoichiometric ratio required for the preparation of 50 g 0.92(0.65BF-0.35PT)-0.08PMN and put them into a ball mill jar, then add 24 ml of deionized water and 1.5 ml of ammonia water as a solvent and weight as a raw material Zirconia beads with a weight of 0.8 to 1.5 times were used as a ball milling medium, and rolled for 24 hours. After ball milling, pour the ball mill slurry into a clean porcelain bowl, put it in a constant temperature oven at 120 ℃ and dry it, then grind the powder finely, put it in a crucible for calcin...
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Abstract
The invention discloses a ternary piezoceramic material with high Curie temperature and a preparation method thereof. The piezoceramic material has a chemical formula of (1-y)((1-x)BF-xPT)-yPMN, wherein 0<y<0.1 and 0.2<x<0.4. A third component of plumbum manganese niobate (PMN) is introduced into a bismuth ferrite-plumbum titanate (BF-PT) system for the first time to form a ternary solid solution system. The characteristic of high Curie temperature of the BF-PT material itself is effectively used, and the introduction of the third component of PMN significantly improves the insulating property of the BF-PT material, which enables the BF-PT-PMN material of the invention to be easily polarized to obtain a high piezoelectric constant. The novel ternary piezoceramic material with high Curie temperature of the invention can prepare high temperature piezoelectric ceramics with a Curie temperature of up to 620 DEG C and a piezoelectric constant of up to 90 pC/N, and when compared with high temperature piezoelectric ceramics prepared in an US patent of Xiaoli Tan in 2013, the prepared high temperature piezoelectric ceramics have more excellent performance with not only a Curie temperature increased by nearly 50 DEG C, but also a piezoelectric constant increased by 26 pC/N. With the material and the method of the invention, application of BF-PT based materials in the high temperature piezoelectric field takes a big step forward.
Description
technical field [0001] The invention relates to a ternary high Curie temperature piezoelectric ceramic material and a preparation method thereof. Background technique [0002] With the rapid development of modern science and technology, many electronic and electrical equipment have put forward higher requirements for the performance parameters of the selected piezoelectric devices. Among them, aerospace, atomic energy, energy, metallurgy, petrochemical and many other industrial and scientific research departments urgently need electronic equipment that can work at higher temperatures. The application of high-temperature piezoelectric materials in these special fields has become a top priority. High-temperature piezoelectric ceramics require a working temperature of 300-800 °C, but the applicable temperature range of lead zirconate titanate (PZT)-based piezoelectric ceramic materials that are highly commercialized today is below 300 °C, which cannot meet the application requi...
Claims
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