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Bismuth sodium titanate-based relaxor ferroelectric ceramic material with high electric card effect in wide temperature range and high electric card strength at low field and preparation method thereof

A technology based on bismuth sodium titanate and electric card effect, which is applied in the field of electronic functional materials and devices, can solve the problems of lead-containing materials, harmfulness to human body, measured electric card temperature-changing electric card strength, etc., and achieves low preparation cost and wide Service temperature zone, good stability effect

Active Publication Date: 2022-04-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN201410474671.1 discloses a method for improving the performance of dielectric electric card ceramic refrigeration equipment. The patent uses BaTiO 3 and bismuth-based PbTiO 3 The electric card device was obtained by forming a multi-layer structure, but this patent is only the design method of the electric card refrigeration device, and there is no breakthrough research from the perspective of a single material, and there is no actual test to measure the temperature change and strength of the electric card. Moreover, the materials involved contain lead, which is harmful to the human body. The bismuth sodium titanate-based relaxor ferroelectric ceramic refrigeration material in this application is an environmentally friendly lead-free material, and there is no pollution during the process of production, use, and disposal. Moreover, the temperature change of the electric card in this application is all based on the high-sensitivity thermal resistance test method, and the accuracy is high.

Method used

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  • Bismuth sodium titanate-based relaxor ferroelectric ceramic material with high electric card effect in wide temperature range and high electric card strength at low field and preparation method thereof
  • Bismuth sodium titanate-based relaxor ferroelectric ceramic material with high electric card effect in wide temperature range and high electric card strength at low field and preparation method thereof
  • Bismuth sodium titanate-based relaxor ferroelectric ceramic material with high electric card effect in wide temperature range and high electric card strength at low field and preparation method thereof

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preparation example Construction

[0038] The preparation method of the above bismuth sodium titanate based relaxor ferroelectric ceramic material comprises the following steps:

[0039] S1, select Bi with a purity greater than 99% 2 o 3 、Na 2 CO 3 、K 2 CO 3 , SrCO 3 、TiO 2 and Nb 2 o 5 As the raw material of bismuth sodium titanate-based relaxor ferroelectric ceramics, weigh and mix according to the above general chemical formula to obtain primary mixed powder;

[0040] S2, add absolute ethanol and zirconia grinding balls into the nylon tank as the ball milling medium, then add the primary mixed powder, and transfer to the planetary ball mill for a ball mill for 10-12 hours, and place the material at 80-120°C after discharge drying in a blast drying box to obtain dried powder;

[0041] S3, transferring the dried powder to a muffle furnace, and pre-sintering at 800-900°C (preferably 850°C) for 3-4 hours to obtain the pre-sintered powder;

[0042] S4, using the same method as in step 2) to carry out t...

Embodiment 1

[0047] A bismuth sodium titanate-based relaxor ferroelectric ceramic material with a wide temperature range, high electric card effect and high electric card strength, its general chemical formula is (Bi 0.5 Na 0.435 K 0.065 ) 0.92 Sr 0.08 Ti 0.99 Nb 0.01 o 3 , i.e. x=0.005, its preparation method is:

[0048] S1, select Bi with a purity greater than 99% 2 o 3 、Na 2 CO 3 、K 2 CO 3 , SrCO 3 、TiO 2 and Nb 2 o 5 As the raw material of bismuth sodium titanate-based relaxor ferroelectric ceramics, weigh and mix according to the stoichiometric ratio in the above general chemical formula to obtain the primary mixed powder;

[0049] S2, add absolute ethanol and zirconia grinding balls into the nylon tank as the ball milling medium, then add the primary mixed powder, and transfer to the planetary ball mill for 12h primary ball milling, and place the material in a blast at 100°C Dried in a drying box to obtain dried powder;

[0050]S3, put the dried powder into a corun...

Embodiment 2

[0065] A bismuth sodium titanate-based relaxor ferroelectric ceramic material with a wide temperature range, high electric card effect and high electric card strength, its general chemical formula is (Bi 0.5 Na 0.428 K 0.072 ) 0.92 Sr 0.08 Ti 0.99 Nb 0.01 o 3 , namely x=0.012, its preparation method is:

[0066] S1, select Bi with a purity greater than 99% 2 o 3 、Na 2 CO 3 、K 2 CO 3 , SrCO 3 、TiO 2 and Nb 2 o 5 As the raw material of bismuth sodium titanate-based relaxor ferroelectric ceramics, weigh and mix according to the stoichiometric ratio in the above general chemical formula to obtain the primary mixed powder;

[0067] S2, add absolute ethanol and zirconia grinding balls into the nylon tank as the ball milling medium, then add the primary mixed powder, and transfer to the planetary ball mill for 12h primary ball milling, and place the material in a blast at 100°C Dried in a drying box to obtain dried powder;

[0068] S3, put the dried powder into a co...

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Abstract

The invention relates to a bismuth sodium titanate-based relaxor ferroelectric ceramic material with wide temperature range, high electric card effect and high electric card strength and a preparation method thereof, wherein the ceramic material conforms to the general chemical formula (Bi 0.5 Na 0.44‑x K 0.06+x ) 0.92 Sr 0.08 Ti 0.99 Nb 0.01 o 3 , the preparation method includes: according to the general chemical formula, mixing the raw materials, and successively undergoing a process of ball milling, discharging, drying, pre-calcination, secondary ball milling, granulation, compression molding, debinding, and sintering to obtain the above-mentioned Ceramic material. Compared with the prior art, the present invention provides a novel bismuth sodium titanate-based relaxor ferroelectric ceramic material. As a lead-free material, the ceramic electric card refrigeration material meets the requirements of environmental protection, and has low preparation cost, The advantages of good stability, the high electric card effect under low electric field and the high electric card effect in wide temperature range have great application prospects in solid refrigeration.

Description

technical field [0001] The invention belongs to the technical field of electronic functional materials and devices, and relates to a novel bismuth sodium titanate-based relaxor ferroelectric ceramic material with a wide temperature range, high electric card effect and high electric card strength and a preparation method thereof, in particular to a ( Bi 0.5 Na 0.44- x K 0.06+x ) 0.92 Sr 0.08 Ti 0.99 Nb 0.01 o 3 Electric card effect of lead-free relaxor ferroelectric ceramics and its preparation method. Background technique [0002] Traditional air-conditioning and refrigeration systems are designed according to the theory of compressor refrigeration and rely on refrigerants such as freon or chlorofluorocarbons (CFCs) to drive. When the refrigerant volatilizes into the atmospheric ozone layer, it can catalyze the reaction of ozone, which greatly reduces the ultraviolet radiation barrier ability of the ozone layer. In order to reduce the damage to the ozone layer, peo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/634C04B35/638C04B35/64
CPCC04B35/475C04B35/63416C04B35/64C04B35/638C04B2235/3298C04B2235/442C04B2235/3251C04B2235/6562C04B2235/6567C04B2235/96
Inventor 沈波李国辉翟继卫
Owner TONGJI UNIV
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