High-solid-solubility relaxation-type nano leadless piezoelectric ceramic and preparation method thereof

A lead-free piezoelectric and solubility technology, applied in the field of piezoelectric ceramics, can solve problems such as uneven grain size, insufficient powder purity, and abnormal growth of grains, and achieve dielectric constant, high dielectric constant, The effect of avoiding harm

Inactive Publication Date: 2015-04-08
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In view of the low purity of the powder prepared by this method and the uneven grain size, and the ceramics prepared by the traditional solid-state method are prone to abnormal grain growth in the microwave sintering environment.
Generally speaking, increasing the content of Ca ions will reduce the Curie temperature of the material and improve the temperature stability of the material. According to experience, the Ca element in BaTiO 3 The maximum solid solubility is 20%, but it is difficult to achieve it by traditional solid phase method, because the powder prepared by traditional method is not pure enough, the particle size is large and the distribution is not uniform

Method used

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  • High-solid-solubility relaxation-type nano leadless piezoelectric ceramic and preparation method thereof
  • High-solid-solubility relaxation-type nano leadless piezoelectric ceramic and preparation method thereof
  • High-solid-solubility relaxation-type nano leadless piezoelectric ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] ①First follow Ba 0.8 Ca 0.2 Ti 0.9 Zr 0.1 o 3 The stoichiometric ratio, that is, the molar ratio is 0.8:0.2:0.1:0.9 to take BaCl 2 2H 2 O(s), CaCl 2 (s), ZrOCl 2 ·8H 2 O(s) and TiCl 4 (1) Dissolve in deionized water, mix after the four are completely dissolved, and let stand until the solution becomes transparent to obtain a mixed solution.

[0038] ② Add weighed NaOH solids to the above transparent mixed solution to adjust the acidity and alkalinity so that the pH value is > 14, stir in the air for 1 min until boiling, and obtain a milky white suspension after the boiling is over, which is Ba 0.8 Ca 0.2 Ti 0.9 Zr 0.1 o 3 Powder precursor.

[0039] ③The Ba obtained in step ② 0.8 Ca 0.2 Ti 0.9 Zr 0.1 o 3 The powder precursor was poured into a hydrothermal reactor, and reacted in a hydrothermal environment at 150°C for 12 hours to obtain Ba 0.8 Ca 0.2 Ti 0.9 Zr 0.1 o 3 Ceramic powder, the Ba 0.8 Ca 0.2 Ti 0.9 Zr 0.1 o 3 The ceramic powder was ...

Embodiment 2

[0042] ①First follow Ba 0.8 Ca 0.2 Ti 0.9 Zr 0.1 o 3 The stoichiometric ratio, that is, the molar ratio is 0.8:0.2:0.1:0.9 to take BaCl 2 2H 2 O(s), CaCl 2 (s), ZrOCl 2 ·8H 2 O(s) and TiCl 4 (1) Dissolve in deionized water, mix after the four are completely dissolved, and let stand until the solution becomes transparent to obtain a mixed solution.

[0043] ② Add weighed NaOH solids to the above transparent mixed solution to adjust the acidity and alkalinity so that the pH value is > 14, stir in the air for 1 min until boiling, and obtain a milky white suspension after the boiling is over, which is Ba 0.8 Ca 0.2 Ti 0.9 Zr 0.1 o 3 Powder precursor.

[0044] ③The Ba obtained in step ② 0.8 Ca 0.2 Ti 0.9 Zr 0.1 o 3 The powder precursor was poured into a hydrothermal reactor, and reacted in a hydrothermal environment at 180°C for 13 hours to obtain Ba 0.8 Ca 0.2 Ti 0.9 Zr 0.1 o 3 Ceramic powder, the Ba 0.8 Ca 0.2 Ti 0.9 Zr 0.1 o 3 The ceramic powder was ...

Embodiment 3

[0047] ①First follow Ba 0.8 Ca 0.2 Ti 0.9 Zr 0.1 o 3 The stoichiometric ratio, that is, the molar ratio is 0.8:0.2:0.1:0.9 to take BaCl 2 2H 2 O(s), CaCl 2 (s), ZrOCl 2 ·8H 2 O(s) and TiCl 4 (1) Dissolve in deionized water, mix after the four are completely dissolved, and let stand until the solution becomes transparent to obtain a mixed solution.

[0048] ② Add weighed NaOH solids to the above transparent mixed solution to adjust the acidity and alkalinity so that the pH value is > 14, stir in the air for 1 min until boiling, and obtain a milky white suspension after the boiling is over, which is Ba 0.8 Ca 0.2 Ti 0.9 Zr 0.1 o 3 Powder precursor.

[0049] ③The Ba obtained in step ② 0.8 Ca 0.2 Ti 0.9 Zr 0.1 o 3 The powder precursor was poured into a hydrothermal reaction kettle, and reacted in a hydrothermal environment at 200°C for 11 hours to obtain Ba 0.8 Ca 0.2 Ti0.9 Zr 0.1 o 3 Ceramic powder, the Ba 0.8 Ca 0.2 Ti 0.9 Zr 0.1 o 3 The ceramic powde...

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Abstract

The invention relates to a high-solid-solubility relaxation-type nano leadless piezoelectric ceramic and a preparation method thereof. The method comprises the following steps: dissolving a soluble raw material in water according to the stoichiometric proportion of Ba0.8Ca0.2Ti0.9Zr0.1O3 to obtain a mixed solution; regulating the pH value of the mixed solution to obtain a powder precursor; reacting at 150-200 DEG C in a hydrothermal environment for 10-15 hours to obtain a billet; and carrying out microwave sintering on the billet at 1280-1320 DEG C to obtain the high-solid-solubility relaxation-type nano leadless piezoelectric ceramic. The ceramic, which is prepared by sintering the Ba0.8Ca0.2Ti0.9Zr0.1O3 ceramic powder at 1280-1320 DEG C, has the advantages of excellent dielectric relaxation behavior and high solid solubility for calcium ions, enhances the temperature stability of the material on the premise of effectively lowering the Curie temperature of the ceramic material, and still has excellent electric properties in some extreme environments.

Description

technical field [0001] The patent of the present invention relates to the field of piezoelectric ceramics, in particular to a high solid solubility relaxation type nano-lead-free piezoelectric ceramic and a preparation method thereof. Background technique [0002] BaTiO 3 It is the earliest discovered perovskite piezoelectric material, which has been widely used in various electronic material components. However, with the continuous advancement of technology, BaTiO 3 Lower piezoelectric coefficient (d 33 <100) can no longer meet people's growing demand for piezoelectric properties of piezoelectric materials. PZT (PbZrTiO 3 ) due to its better piezoelectric properties (d 33 >500) has gradually replaced the traditional BaTiO 3 As an emerging piezoelectric material, it is used in the field of electronic materials. In recent years, with the increasing awareness of environmental protection and the harm of lead poisoning to the environment and human health, piezoelect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 蒲永平崔晨薇张磊吕伟鹏孙梓雄袁天
Owner SHAANXI UNIV OF SCI & TECH
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