Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Ta-doped potassium sodium niobate-based piezoelectric ceramic material and preparation method thereof

A potassium niobate-based, piezoelectric ceramic technology, applied in the field of functional ceramic materials, can solve the problems of shortening the time, the effect is not particularly good, and there is no research on the density of ceramics, and achieves low reaction temperature, short time, and high heat energy utilization. high effect

Active Publication Date: 2020-02-28
夏璐
View PDF5 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN102351536A provides a preparation method of microwave hydrothermally synthesized potassium sodium niobate-based powder and piezoelectric ceramics, using KOH and NaOH mixed lye as the reaction solvent, NaOH:KOH=1.3~1.5:4.5~4.7, using Nb 2 o 5 As a reactant, doped LiTaO 3 , microwave hydrothermal synthesis of K x Na 1-x-y Nb 1-y o 3— wxya 3 Powder, after the powder is prepared, it is granulated by PVA, pressed into shape, discharged, sintered at normal pressure, polarized, and finally piezoelectric ceramics are obtained. The above preparation method shortens the time and takes advantage of microwave synthesis. The obtained niobium Potassium sodium sodium based piezoelectric ceramic performance has been improved, but the effect is not particularly good
Density has a great influence on the performance of piezoelectric ceramics. The above-mentioned schemes have not studied the density of ceramics after sintering, and no measures have been taken to improve the density of piezoelectric ceramics. Therefore, the electrical and mechanical properties of piezoelectric ceramics cannot be compared. greatly improved

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ta-doped potassium sodium niobate-based piezoelectric ceramic material and preparation method thereof
  • Ta-doped potassium sodium niobate-based piezoelectric ceramic material and preparation method thereof
  • Ta-doped potassium sodium niobate-based piezoelectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1.Na 0.5 K 0.5 Nb 0.89 Ta 0.11 o 3 Powder preparation:

[0033] (1) Take solid KOH, NaOH and add water to configure the mixed lye with a concentration of 7mol / L, NaOH + and K + The ratios are 1:6, Nb 2 o 5 and Ta 2 o 5 The mass molar ratio of the added total amount and lye is 1:8, wherein Nb 2 o 5 and Ta 2 o 5 The mass molar ratio of the mixture is 8:1, and 1.5wt% of polyethylene glycol is added.

[0034] (2) Mix the powder with the lye and place it in a polytetrafluoroethylene-lined reaction kettle, put the reaction kettle into a microwave reactor, set the reaction temperature to 160°C, and the reaction time to 2h.

[0035] (3) Pour the supernatant of the lining into a beaker and add hydrochloric acid dropwise to neutrality, no precipitation is seen.

[0036] (4) Wash the white precipitate on the bottom of the inner substrate with deionized water until neutral, and dry it in an oven at 100° C. for 1 hour.

[0037] 2.Na 0.5 K 0.5 Nb 1-y Ta y o 3 Pie...

Embodiment 2

[0044] 1.Na 0.5 K 0.5 Nb 0.86 Ta 0.14 o 3 Powder preparation:

[0045] (1) Take solid KOH, NaOH and add water to configure the mixed lye with a concentration of 7mol / L, wherein NaOH + and K + The ratios are 1:6, Nb 2 o 5 and Ta 2 o 5 The mass molar ratio of the added total amount and lye is 1:8, wherein Nb 2 o 5 and Ta 2 o 5 The mass molar ratio is 6:1, and 1.5wt% polyacrylic acid is added.

[0046] (2) Mix the powder with the lye and place it in a polytetrafluoroethylene-lined reaction kettle, put the reaction kettle into a microwave reactor, set the reaction temperature to 170°C, and the reaction time to 3h.

[0047] (3) Pour the supernatant of the lining into a beaker and add hydrochloric acid dropwise to neutrality, no precipitation is seen.

[0048] (4) Wash the white precipitate on the bottom of the inner substrate with deionized water until neutral, and dry it in an oven at 100° C. for 1 hour.

[0049] 2.Na 0.5 K 0.5 Nb 1-y Ta y o 3 Piezoelectric ce...

Embodiment 3

[0056] 1.Na 0.5 K 0.5 Nb 0.83 Ta 0.17 o 3 Powder preparation:

[0057] (1) Take solid KOH, NaOH and add water to configure the mixed lye with a concentration of 7mol / L, wherein NaOH + and K + The ratios are 1:6, Nb 2 o 5 and Ta 2 o 5 The mass molar ratio of the added total amount and lye is 1:10, wherein Nb 2 o 5 and Ta 2 o 5 The mass molar ratio is 5:1, and 1.5wt% of polyacrylic acid is added.

[0058] (2) Mix the powder with the lye and place it in a polytetrafluoroethylene-lined reaction kettle, put the reaction kettle into a microwave reactor, set the reaction temperature to 180°C, and the reaction time to 3h.

[0059] (3) Pour the supernatant of the lining into a beaker and add hydrochloric acid dropwise to neutrality, no precipitation is seen.

[0060] (4) Wash the white precipitate on the bottom of the inner substrate with deionized water until neutral, and dry it in an oven at 100° C. for 1 hour.

[0061] 2.Na 0.5 K 0.5 Nb 1-y Ta y o 3 Piezoelectri...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a Ta-doped potassium sodium niobate-based piezoelectric ceramic material and a preparation method thereof. The general formula of the piezoelectric ceramic is Na<0.5>K<0.5>Nb<1-y>Ta<y>O<3>, wherein y is greater than or equal to 0.11 and less than or equal to 0.2; the invention discloses a preparation method of the piezoelectric ceramic material. The preparation method comprises the following steps: carrying out microwave hydrothermal synthesis of Na0.5K0.5Nb1-yTayO3 powder; taking a 7mol / L mixed alkali liquor of NaOH and KOH as a solvent, taking Nb2O5 and Ta2O5 as reactants, wherein the ratio of Na+ to K+ is 1: 1 6, the adding total amount of Nb2O5 and Ta2O5 to the mass molar ratio of the solvent is 1: 8-1: 12, the mass molar ratio of Nb2O5 to Ta2O5 is 8: 1-4: 1, theadding amount of a dispersing agent is 1.5 wt%, the microwave reaction temperature is 160-180 DEG C, and the reaction time is 2-4 hours. The invention also discloses a preparation method for preparing piezoelectric ceramic from the powder by spark sintering, annealing treatment is carried out in an oxygen atmosphere, and the obtained piezoelectric ceramic has good electrical properties.

Description

technical field [0001] The invention relates to the technical field of functional ceramic materials, in particular to the preparation of a Ta-doped potassium sodium niobate-based piezoelectric ceramic material. Background technique [0002] Piezoelectric ceramics are information functional ceramic materials that can convert mechanical energy and electrical energy to each other, and are widely used in medical imaging, acoustic sensors, acoustic transducers, ultrasonic motors and other fields. [0003] At present, the industrialized piezoelectric ceramics are mainly lead-based PZT, PMNT and PZNT. The extensive use of these materials will bring great harm to human life and the natural environment. American scholars studied KNbO in 1959 3 -NaNbO 3 , when the composition is K 0.5 Na 0.5 NbO 3 (NKN for short), the performance of ceramic solid solution is the best. KbO 3 and K 0.5 Na 0.5 NbO 3 The phase stability temperatures of the phases are 1040 °C and 1140 °C, respect...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C04B35/495C04B35/64C04B41/88
CPCC04B35/495C04B35/64C04B41/88C04B41/009C04B41/5116C04B2235/3251C04B2235/6562C04B2235/6583C04B2235/6567C04B2235/666C04B2235/77C04B2235/96C04B2235/662C04B41/0072
Inventor 袁爱桃
Owner 夏璐
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com