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

Silver niobate-based lead-free piezoelectric ceramic and preparation method thereof

A technology based on lead-free piezoelectric and piezoelectric ceramics, which is applied in the field of new lead-free piezoelectric ceramics and its preparation, can solve the problems of low piezoelectric performance of AN-based ceramics, difficulty in obtaining AN-based solid solutions, unstable process, etc. The effect of good temperature stability

Inactive Publication Date: 2011-11-23
SOUTHWEAT UNIV OF SCI & TECH
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the piezoelectric performance of AN-based ceramics is still low (d 33 <70pC / N), synthesis and sintering require an oxygen atmosphere, the process is unstable, and it is difficult to obtain a pure perovskite phase AN-based solid solution in an air atmosphere

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
  • Silver niobate-based lead-free piezoelectric ceramic and preparation method thereof
  • Silver niobate-based lead-free piezoelectric ceramic and preparation method thereof
  • Silver niobate-based lead-free piezoelectric ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Synthesized in an air atmosphere by a two-step method (Ag 0.64 Li 0.16 Na 0.1 K 0.1 )NbO 3 . First weigh the Ag according to the stoichiometric ratio 2 O. Li 2 CO 3 and Nb 2 o 5 , ball milled in absolute ethanol solution for 12 hours, and the dried powder was calcined at 920°C for 3 hours to synthesize Ag 0.8 Li 0.2 NbO 3 (recorded as ALN); Then take Na by stoichiometric ratio 2 CO 3 、K 2 CO 3 and Nb 2 o 5 , ball milled in absolute ethanol solution for 12 hours, and the dried powder was calcined at 850°C for 3 hours to synthesize (Na 0.5 K 0.5 )NbO 3 (NKN); then according to chemical formula 0.8 (Ag 0.8 Li 0.2 )NbO 3 -0.2 (Na 0.5 K 0.5 )NbO 3 Weigh an appropriate amount of ALN and NKN, ball mill in absolute ethanol solution for 12 hours, and calcinate the dried powder at 900°C for 3 hours to synthesize (Ag 0.64 Li 0.16 Na 0.1 K 0.1 )NbO 3 For solid solution, the calcined samples were ground and analyzed by XRD. From figure 1 It can be see...

Embodiment 2

[0023] Synthesized by one-step method under air atmosphere (Ag 0.75 Li 0.1 Na 0.1 K 0.05 )NbO 3 , add 1wt% CuO as a sintering aid, and seal the sintering with a crucible. Weigh Ag according to stoichiometric ratio 2 O. Li 2 CO 3 、Na 2 CO 3 、K 2 CO 3 and Nb 2 o 5 , ball milled in anhydrous ethanol solution for 12 hours, the dried powder was calcined at 900°C for 3 hours, the calcined sample was added with 1wt% CuO and then ball milled for 12 hours, after drying, 10wt% polyvinyl alcohol aqueous solution was added to mix evenly, and the After dry pressing (20MPa) and ejection, seal and sinter at 980°C for 2 hours. The sintered ceramic sheet is covered with a silver electrode, and polarized in silicone oil at 120° C., with a polarizing voltage of 4-5 kV and a polarizing time of 15 minutes. After standing for 24 hours, the Q of the ceramic was measured m = 265, d 33 =50pC / N,k p =20.6%, P r =14.3μC / cm 2 ,E c =3.71kV / mm, T c = 330°C.

[0024] From figure 2 It ...

Embodiment 3

[0032] Synthesized by one-step method under air atmosphere (Ag 0.73 Li 0.12 Na 0.1 K 0.05 )NbO 3 , add 1wt% CuO as a sintering aid, and seal the sintering with a crucible. Weigh Ag according to stoichiometric ratio 2 O. Li 2 CO 3 、Na 2 CO 3 、K 2 CO 3 and Nb 2 o 5 , the rest of the process conditions were consistent with Example 2, and the surface morphology of the ceramic sheet was observed with a scanning electron microscope (SEM). From image 3 It can be seen that the ceramic grain boundary is clear, the sample is dense, the grain size is 1-3 μm, and the volume density reaches more than 95% of the theoretical density. The Q of the ceramics was measured after being placed for 24 hours after polarization m =266,d 33 =54pC / N,k p =18.0%, P r =14.6μC / cm 2 ,E c = 3.56 kV / mm. From Figure 4 It can be seen that the Curie temperature T of the ceramic c up to 340°C, and T c The following have good temperature stability.

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

PropertyMeasurementUnit
piezoelectric charge coefficientaaaaaaaaaa
Curie pointaaaaaaaaaa
remanent polarizationaaaaaaaaaa
Login to View More

Abstract

The invention relates to silver-niobate-based lead-free piezoelectric ceramic and a preparation method thereof, which belong to the field of piezoelectric materials. The composition of the piezoelectric ceramic can be represented by using a general formula (Ag1-x-y-zLixNayKz) (Nb1-m-nTamSbn)O3+wMalphaObeta, x, y, z, m and n in the formula are mole ratios of corresponding components, MalphaObeta is one or multiple cosolvents, M is an element which has +2-+4 valency and can form a solid oxide with oxygen, alpha and beta respectively represent the atom numbers of the element M and the oxygen, w represents the mass percent of MalphaObeta to the total weight of raw materials, 0<=x<=0.2, 0<=y<=0.2, 0<=z<=0.2, 0<=m<=0.1, 0<=n<=0.1, and 0<=w<=5%. The invention further provides a two-step synthesis technology and a low temperature seal sintering mode. Silver-niobate-based lead-free piezoelectric ceramic is made in the air with a traditional ceramic technology. The mechanical quality factor Qm of the series ceramic can reach 1330, the remanent polarization strength Pr reaches 22muC / cm<2>, the piezoelectric coefficient d33 reaches 65pC / N, the Curie temperature Tc reaches 340 DEG C, and the temperature stability is good.

Description

1. Technical field [0001] The invention relates to a novel lead-free piezoelectric ceramic and a preparation method thereof, and belongs to the field of piezoelectric ceramics with perovskite structure and environment coordination. 2. Background technology [0002] Piezoelectric ceramics are an important class of functional materials, widely used in the fields of electronics and microelectronics, and their world market share accounts for more than one-third of the entire functional ceramics. Traditional piezoelectric ceramics are mainly based on Pb(Zr,Ti)O 3 (PZT)-based binary and ternary ceramics still occupy a dominant position in the field of piezoelectric applications. With the improvement of people's awareness of environmental protection and the implementation of social sustainable development strategies, lead-free piezoelectric ceramics have become one of the frontiers and hotspots of new material research. New material science and technology workers at home and abro...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 吴浪李玉香滕元成刘乃铭周飞
Owner SOUTHWEAT UNIV OF SCI & TECH
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