A kind of lead-free piezoelectric ceramic material for ventilator and preparation method thereof

A lead-free piezoelectric and ceramic material technology, applied in the field of electronic ceramic materials, can solve the problems of poor preparation stability, nervous system poisoning, easy deviation of stoichiometry of PZT piezoelectric ceramics, etc., and achieves high density, good electrical performance, The effect of improving preparation stability

Active Publication Date: 2022-07-15
HUNAN MEICHENG CERAMIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the PZT piezoelectric ceramic system has excellent piezoelectricity, thermal stability and mature applications, the main raw material PbO for the preparation of PZT ceramics is highly toxic, and it will volatilize during high-temperature sintering, and trace amounts of PbO in the air will Seriously harmful to the nervous system of humans and animals, the lead content in PZT ceramics is as high as 60wt%, which will bring huge environmental pressure from preparation to recycling, and due to the high-temperature volatilization characteristics of PbO, the stoichiometry of PZT piezoelectric ceramics The ratio is prone to deviation and the preparation stability is poor

Method used

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  • A kind of lead-free piezoelectric ceramic material for ventilator and preparation method thereof
  • A kind of lead-free piezoelectric ceramic material for ventilator and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A lead-free piezoelectric ceramic material for ventilator, represented by the following chemical formula: 0.65 (Bi 0.50 Na 0.50 )TiO 3 -0.25LiNbO 3 -0.10 (Bi 0.75 K 0.25 )HfO 3 -0.15%La 2 O 3 -0.05% LiBiO 2

[0036] Its preparation method is as follows:

[0037] will Bi 2 O 3 , TiO 2, Na 2 CO 3 , The molten salt is weighed and proportioned, the molten salt is composed of NaCl and KCl according to the mass ratio of 1:1, and the amount of molten salt is Bi 2 O 3 , TiO 2 , Na 2 CO 3 3 times the total mass, use anhydrous ethanol as the ball milling medium, dry the ball for 15 hours once, pre-burn at 700°C for 2 hours, then use deionized water as the ball milling medium, dry the ball for 15 hours for the second time, and wash it with water until no Cl - detected, dried, obtained (Bi 0.50 Na 0.50 )TiO 3 , the Li 2 CO 3 , Nb 2 O 5 , The molten salt is weighed and proportioned, the molten salt is composed of NaCl and KCl according to the mass ratio of ...

Embodiment 2

[0039] A lead-free piezoelectric ceramic material for ventilator, represented by the following chemical formula:

[0040] 0.65(Bi 0.50 Na 0.50 )TiO 3 -0.25LiNbO 3 -0.10 (Bi 0.75 K 0.25 )HfO 3 -0.15%La 2 O 3 -0.05% LiBiO 2

[0041] Its preparation method is as follows:

[0042] will Bi 2 O 3 , TiO 2 , Na 2 CO 3 , The molten salt is weighed and proportioned, the molten salt is composed of NaCl and KCl according to the mass ratio of 1:1, and the amount of molten salt is Bi 2 O 3 , TiO 2 , Na 2 CO 3 5 times of the total mass, use absolute ethanol as the ball milling medium, dry after the first ball milling for 10 hours, pre-burn at 700 °C for 2 hours, then use deionized water as the ball milling medium, dry after the second ball milling for 10 hours, and wash with water until no Cl - detected, dried, obtained (Bi 0.50 Na 0.50 )TiO 3 , the Li 2 CO 3 , Nb 2 O 5 , The molten salt is weighed and proportioned, the molten salt is composed of NaCl and KCl accor...

Embodiment 3

[0044] A lead-free piezoelectric ceramic material for ventilator, represented by the following chemical formula:

[0045] 0.65(Bi 0.50 Na 0.50 )TiO 3 -0.25LiNbO 3 -0.10 (Bi 0.75 K 0.25 )HfO 3 -0.15%La 2 O 3 -0.05% LiBiO 2

[0046] Its preparation method is as follows:

[0047] will Bi 2 O 3 , TiO 2 , Na 2 CO 3 , The molten salt is weighed and proportioned, the molten salt is composed of NaCl and KCl according to the mass ratio of 1:1, and the amount of molten salt is Bi 2 O 3 , TiO 2 , Na 2 CO 3 10 times the total mass, use anhydrous ethanol as the ball-milling medium, dry after the first ball-milling for 15 hours, pre-burn at 700°C for 4 hours, then use deionized water as the ball-milling medium, dry the ball-milling for 15 hours for the second time, and wash with water until no Cl - detected, dried, obtained (Bi 0.50 Na 0.50 )TiO 3 , the Li 2 CO 3 , Nb 2 O 5 , The molten salt is weighed and proportioned, the molten salt is composed of NaCl and KCl ...

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Abstract

The invention relates to the field of electronic ceramic materials, in particular to a lead-free piezoelectric ceramic material for ventilators and a preparation method thereof, which is represented by the following chemical formula: x(Bi a Na 1‑a )TiO 3 ‑yLiNbO 3 ‑(1‑x‑y)(Bi b K 1‑b )HfO 3 ‑αLa 2 O 3 ‑βLiBiO 2 , x is 0.55-0.70, y is 0.10-0.25, a is 0.45-0.75, b is 0.45-0.75, α is 0.15-0.3%, β is 0.01-0.1%, the density of the piezoelectric ceramic material prepared by the present invention is High, piezoelectric performance is better than most lead-free piezoelectric ceramic materials, has broad application prospects, can be used to make piezoelectric valves for ventilator use.

Description

technical field [0001] The invention relates to the field of electronic ceramic materials, in particular to a lead-free piezoelectric ceramic material for ventilators and a preparation method thereof. Background technique [0002] The sign of patients with new coronavirus pneumonia developing into severe or critical illness is respiratory failure and hypoxia. Therefore, early detection of hypoxemia and timely use of ventilator intervention can prevent critically ill patients from becoming critically ill, and save time for the life of patients. Piezoelectric valves made of piezoelectric ceramic materials are the key components of modern ventilators. For the manufacture of ventilators, piezoelectric ceramics are indispensable. [0003] In 1952, Shirane et al. synthesized lead zirconate titanate (PZT), which is considered to be the most valuable piezoelectric material and has received considerable attention and research in the last century. At present, PZT is still the most e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/622C04B35/626
CPCC04B35/475C04B35/622C04B35/62675C04B2235/3298C04B2235/3232C04B2235/3201C04B2235/3203C04B2235/3227C04B2235/3244C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567C04B2235/77
Inventor 方豪杰贺亦文张晓云张斗袁晰
Owner HUNAN MEICHENG CERAMIC TECH
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