Bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramics with negative electric card effect and preparation method thereof

A bismuth titanate-based bismuth and lead-free piezoelectric technology, which is applied in the field of electronic functional materials and devices, can solve the problems such as the limitation of the application of lead-containing films

Active Publication Date: 2022-06-14
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the application of lead-containing film has been gradually restricted

Method used

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  • Bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramics with negative electric card effect and preparation method thereof
  • Bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramics with negative electric card effect and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of lead-free piezoelectric ceramics with bismuth titanate-based bismuth layer structure by solid-phase reaction method 4- x Ce x Ti 2.98 (WNb) 0.01 O 12 . where x=0.03. Weigh Bi according to stoichiometric ratio 2 O 3 , TiO 2 , WO 3 , Nb 2 O 5 , CeO 2 powder as a raw material. The raw materials are mixed by wet ball milling, the mass ratio of raw materials: grinding balls: alcohol = 1:1.5:0.75, and the balls are milled for 4 hours to make the components evenly mixed to obtain a mixture. The mixture was dried and passed through a 40-mesh sieve. After briquetting at 5MPa, the mixture was raised to 850°C at a heating rate not higher than 2°C / min and kept for 2 hours to obtain a calcined block. The calcined block was ground and crushed, passed through a 40-mesh sieve, and continued to be mixed according to the wet ball milling method. PVA binder is added to the ceramic powder, and the mass ratio of the PVA binder to the ceramic powder is 6%, and g...

Embodiment 2

[0042] It is basically the same as Example 1, the difference is only that x=0.04.

Embodiment 3

[0044] It is basically the same as Example 1, except that x=0.05.

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Abstract

The invention discloses a lead-free piezoelectric ceramic with bismuth titanate-based bismuth layered structure and a preparation method thereof. The chemical composition of the bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramic is Bi 4‑x Ce x Ti 2.98 (WNb) 0.01 o 12 , where 0< x ≤0.07. The bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramic has the characteristics of wide working temperature range and large negative charge effect, and will not cause harm to the ecological environment and human health in the process of preparation, use and disposal, and is suitable for future use. Development of a Micro Refrigerator.

Description

technical field [0001] The invention belongs to the technical field of electronic functional materials and devices, and in particular relates to a bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramic with negative electric trapping effect and a preparation method thereof. Background technique [0002] Refrigeration technology is indispensable in daily life and industrial production. The traditional refrigeration technology mostly uses freon as the medium refrigerant, and the whole cycle in the refrigeration process is a vapor compression process. The solid-state refrigeration device prepared by reversible adiabatic temperature denaturation based on the electric card effect has the advantages of high efficiency, small volume, convenient use, and environmental protection. Accordingly, the electric card effect solid-state refrigeration is expected to replace the high energy consumption refrigeration technology to greatly improve the working efficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/622
CPCC04B35/475C04B35/622C04B2235/3229C04B2235/3258C04B2235/3251C04B2235/6562C04B2235/6567C04B2235/96
Inventor 董显林谢新春周志勇
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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