Novel potassium sodium niobate-based leadless piezoelectric ceramics and preparation method thereof

A potassium-sodium niobate-based, lead-free piezoelectric technology, which is applied in the field of potassium-sodium niobate-based lead-free piezoelectric ceramics and its preparation, can solve the problems of high sintering temperature, unfavorable sintering of KNN-based ceramics, and long sintering time. Achieve the effects of lowering the sintering temperature, facilitating automatic control and continuous operation, and short holding time

Inactive Publication Date: 2013-12-25
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sintering temperature of the traditional sintering process is relatively high, and the sintering time is relatively long, which is not conducive to the sintering of KNN-based ceramics. Therefore, the piezoelectric constant of KNN ceramics prepared by the traditional sintering process is d33 Only 80 pC / N

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Chemically pure Na 2 CO 3 , K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 、 Ta 2 o 5 , Sb 2 o 3 and ZnO as raw materials, according to the chemical formula (Na 0.52 K 0.46 Li 0.06 )(Nb 0.86 Ta 0.08 Sb 0.06 )O 3 + x ZnO, take x =0.005, carry out batching; Na 2 CO 3 、K2 CO 3 , Li 2 CO 3 , Nb 2 o 5 、 Ta 2 o 5 , Sb 2 o 3 , The mass ratio of ZnO raw materials is: 306:356:46:1267:196:97:5. According to the mass ratio of the above raw materials, 50 g was mixed, with absolute ethanol as the ball milling medium, mixed with a planetary ball mill for 4 h at a speed of 250 rpm, and the slurry was dried at 100 °C for 8 h. The dry powder was kept at 800 ℃ for 4 h to synthesize potassium sodium niobate based ceramic powder. Add 5wt.% polyvinyl alcohol (PVA) to the powder, and press it under 200MPa. First, the traditional sintering method was used to raise the temperature to 650 °C at a rate of 10 °C / min, hold the temperature for 60 min for debinding, and cool to roo...

Embodiment 2

[0027] Chemically pure Na 2 CO 3 , K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 、 Ta 2 o 5 , Sb 2 o 3 and ZnO as raw materials, according to the chemical formula (Na 0.52 K 0.46 Li 0.06 )(Nb 0.86 Ta 0.08 Sb 0.06 )O 3 + x ZnO, take x =0.010, carry out batching; Na 2 CO 3 、K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 、 Ta 2 o 5 , Sb 2 o 3 , The mass ratio of ZnO raw materials is: 305:355:46:1265:196:97:9. According to the mass ratio of the above raw materials, 50 g was mixed, with absolute ethanol as the ball milling medium, mixed with a planetary ball mill for 4 h at a speed of 250 rpm, and the slurry was dried at 100 °C for 8 h. The dry powder was kept at 800 ℃ for 4 h to synthesize potassium sodium niobate based ceramic powder. Add 5wt.% polyvinyl alcohol (PVA) to the powder, and press it under 200MPa. First, the traditional sintering method was used to raise the temperature to 650 °C at a rate of 10 °C / min, hold the temperature for 60 min for debinding, and cool to r...

Embodiment 3

[0030] Chemically pure Na 2 CO 3 , K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 、 Ta 2 o 5 , Sb 2 o 3 and ZnO as raw materials, according to the chemical formula (Na 0.52 K 0.46 Li 0.06 )(Nb 0.86 Ta 0.08 Sb 0.06 )O 3 + x ZnO, take x =0.015, carry out batching; Na 2 CO 3 、K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 、 Ta 2 o 5 , Sb 2 o 3 , The mass ratio of ZnO raw materials is: 305:354:46:1262:196:97:13.5. According to the mass ratio of the above raw materials, 50 g was mixed, with absolute ethanol as the ball milling medium, mixed with a planetary ball mill for 4 h at a speed of 250 rpm, and the slurry was dried at 100 °C for 8 h. The dry powder was kept at 800 ℃ for 4 h to synthesize potassium sodium niobate based ceramic powder. Add 5wt.% polyvinyl alcohol (PVA) to the powder, and press it under 200MPa. First, the traditional sintering method was used to raise the temperature to 650 °C at a rate of 10 °C / min, hold the temperature for 60 min for debinding, and cool t...

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Abstract

The invention discloses a novel potassium sodium niobate-based leadless piezoelectric ceramics and a preparation method thereof. The potassium sodium niobate-based leadless piezoelectric ceramics which is higher in density, excellent in piezoelectric property and environment-friendly is prepared by adjusting the components of the potassium sodium niobate-based leadless piezoelectric ceramics and adopting the technologies such as microwave sintering, silver roasting, polarization, etc. The novel potassium sodium niobate-based leadless piezoelectric ceramics is prepared from the raw materials of chemical pure Na2CO3, K2CO3, Li2CO3, Nb2O5, Ta2O5 and Sb2O3, and the additives of chemical pure ZnO, ZnCO3 or 5ZnO.4CO2.6H2O; the composition of the leadless piezoelectric ceramics is expressed as the chemical formula: (Na 0.52 K0.46 Li 0.06) (Nb 0.86 Tb 0.08 Sb 0.06) O(3+x) ZnO, wherein x is equal to 0.00-0.05.

Description

technical field [0001] The invention relates to a novel piezoelectric ceramic material, in particular to a potassium sodium niobate-based lead-free piezoelectric ceramic and a preparation method thereof. Background technique [0002] Piezoelectric ceramics are a class of high-tech materials widely used in the electronics industry. However, lead zirconate titanate Pb(Zr,Ti)O is currently used on a large scale. 3 Based piezoelectric ceramics (called PZT-based piezoelectric ceramics), the Pb content in PZT-based piezoelectric ceramics is as high as 60wt. %, which will cause harm to human health and the living environment during its preparation, use, and disposal. Therefore, the research and development of lead-free piezoelectric ceramics with excellent piezoelectric performance and environmental friendliness is an urgent and socially significant topic. [0003] In the lead-free piezoelectric ceramic system, potassium sodium niobate (K,Na)NbO 3 Lead-free piezoelectric cerami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/64C04B41/88
Inventor 李海涛闫焉服王维许荣辉刘伟
Owner HENAN UNIV OF SCI & TECH
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