Preparation method of (K05Na05) NbO3 (KNN) lead-free piezoelectric ceramic material

A technology of potassium sodium niobate and ceramic materials, which is applied in the field of lead-free piezoelectric materials, can solve the problems of high price, increased material preparation cost, unfavorable industrial production, etc., achieves simple methods, promotes application progress, and improves sinterability Effect

Inactive Publication Date: 2012-01-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] AS: Atmospheric pressure sintering; CIP: Cold isostatic pressing; HIP: Hot isostatic pressing; HP: Hot pressing sintering; The required raw mate...

Method used

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  • Preparation method of (K05Na05) NbO3 (KNN) lead-free piezoelectric ceramic material
  • Preparation method of (K05Na05) NbO3 (KNN) lead-free piezoelectric ceramic material

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Embodiment 1

[0045] Preparation of potassium sodium niobate ceramic material a by high energy ball milling.

[0046] According to (K x Na 1-x )NbO 3 (x=0.50) formula, weigh 2.094g K respectively with electronic balance 2 CO 3 Powder, 1.590g Na 2 CO 3 powder, and 7.982g Nb 2 o 5 For powder, mix the raw materials evenly, burn at 200°C, place it in a high-energy ball mill for 24 hours, then heat the obtained powder at 650°C for 4 hours to obtain potassium sodium niobate powder, and then dissolve the obtained powder with absolute ethanol As the medium, mix the powder with a planetary ball mill for 24 hours, dry the slurry at 80°C, add 8wt% PVA to the powder as a binder to granulate, dry press, hold at 550°C for 6h to remove the viscosity, and obtain potassium sodium niobate. Blank, put the formed green blank into a programmed temperature-controlled box furnace for sintering, the sintering temperature is 1130°C, and the holding time is 3h. The obtained ceramic original sheet is polished...

Embodiment 2

[0050] Potassium sodium niobate ceramic material b prepared by high energy ball milling.

[0051] According to (K x Na 1-x )NbO 3 (x=0.50) formula, weigh 2.094g K respectively with electronic balance 2 CO 3 Powder, 1.590g Na 2 CO 3 powder, and 7.982g Nb 2 o 5 For the powder, use absolute ethanol as the medium, mix the powder with a planetary ball mill for 24 hours, dry the slurry at 80°C, and then heat the obtained dry powder at 850°C for 4 hours to synthesize potassium sodium niobate. The synthesized powder was high-energy ball milled for 24 hours, and then the obtained powder was granulated by adding 8wt% PVA as a binder, dry-pressed, and kept at 550°C for 6 hours to remove stickiness to obtain a green body of potassium sodium niobate. The green body was sintered in a programmable temperature-controlled box-type furnace at a temperature of 1130°C and a holding time of 3 hours. The obtained ceramic original sheet was polished with fine sand, coated with silver paste o...

Embodiment 3

[0054] Preparation of potassium sodium niobate ceramic material a by high energy ball milling.

[0055] According to (K x Na 1-x )NbO 3 (x=0.50) formula, weigh 2.094g K respectively with electronic balance 2 CO 3 Powder, 1.590g Na 2 CO 3 powder, and 7.982g Nb 2 o 5 For powder, mix the raw materials evenly, burn at 200°C, place it in a high-energy ball mill for 32 hours, then heat the obtained powder at 500°C for 2 hours to obtain potassium sodium niobate powder, and then dissolve the obtained powder with absolute ethanol As the medium, mix the powder with a planetary ball mill for 24 hours, dry the slurry at 80°C, add 8wt% PVA to the powder as a binder to granulate, dry press, hold at 550°C for 6h to remove the viscosity, and obtain potassium sodium niobate. Blank, put the formed green blank into a programmed temperature-controlled box furnace for sintering, the sintering temperature is 1130°C, and the holding time is 3h. The obtained ceramic original sheet is polished...

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Abstract

Belonging to the lead-free piezoelectric material field, the invention specifically relates to a preparation method of KNN lead-free piezoelectric ceramic material via high-energy ball milling. With Na2CO3, K2CO3 and Nb2O5 as the raw materials, the method comprises the steps of: weighing raw material mass according to the chemical formula (KxNa1-x) NbO3 (x=0.42-0.58), mixing the raw materials uniformly and putting them in a high energy bowl mill for ball milling at a rotating speed of 200r/min for 8-32h, thus obtaining submicron powder of high activity, then synthesizing the powder at a low temperature and carrying out the second ball milling, and conducting dry-pressing and molding as well as sintering, thus obtaining the ceramic material. The preparation method of the invention substantially reduces the synthesis temperature of KNN powder in prior art, and improves sinterability of KNN ceramic material, as well as promotes the ferroelectric and piezoelectric performance improvement thereof, with the remanent polarization Pr and the piezoelectric constant d33 both enhanced by about 10% compared with traditional preparation technologies.

Description

technical field [0001] The invention belongs to the field of lead-free piezoelectric materials, and in particular relates to a method for preparing potassium sodium niobate lead-free piezoelectric ceramic materials by high-energy ball milling. Background technique [0002] For a long time, lead-based piezoelectric ceramics represented by lead zirconate titanate (PZT) have been dominant in commercial applications, but the lead content of PZT ceramics is as high as more than 60%, which will cause serious damage during production, use and disposal. Pollution by humans and the ecological environment. Therefore, with the requirement of sustainable development of human society and the full implementation of regulations on lead-free electronic products in some developed countries, finding lead-free piezoelectric materials that can replace PZT has become one of the urgent tasks in the field of electronic materials. At present, materials such as bismuth layered titanate, perovskite ...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/626
Inventor 翟继卫郝继功沈波
Owner TONGJI UNIV
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