SU1350158A1 - Piezoelectric ceramic material - Google Patents

Abstract

The invention relates to piezoelectric ceramic materials and can be used to create high-frequency electromechanical transducers, in ultrasonic delay lines on bulk and surface waves. To increase the volume of the piezoelectric effect, the mechanical quality factor, the material based on sodium niobate additionally contains magnesium oxide in the following ratio of components, wt.%: 1.20-15.60; NajO 15.00-24.5C); KBVCJs 69.31-74.26; MgO 0.03-0.10. The material obtained by sintering at 1190-1220 ° C has the following properties: 85-70; tg сГ 0.1-0.2%; djj-10 55-59 C / H; dj, -10; 2 5.85 - c 6.90 C / H; the volume of the piezoelectric effect (d 3i / i / djj 8.8-9.5; Q 2570-2700.2 tab. CO СЛ СД 00

Description

. 113501582.

The invention relates to piezoelectric-220 ° C with an exposure time of 1 hour. Electrodes can be used on slip-on ceramic materials and coated discs to apply electrodes; tribute to high frequency electromechanical

by sputtering aluminum in vacuum. Polarization is carried out in poly

transducers, based on the left scientific research institute of piezoelectricity, and in ultrasonic delay lines on bulk and surface waves.

The purpose of the invention is to reduce the dielectric constant, increase the volume of the piezoelectric effect, the mechanical quality factor.

Ceramics based on sodium lithium niobate modified with oxide: magnesium are obtained from lithium, sodium carbonates, magnesium oxide, grade of analytical grade. and niobium pentoxide. Mixing and grinding the components is carried out in a shock drum in an absolute alcohol medium, grinding time is 12 hours. After drying at 200-250 seconds, the material is cast and burned in a powder state at 900 ° C for 4 hours, then crushed to pass, through a sieve of 10,000 holes / cm, after which disks with a diameter of 12 mm and a thickness of 2 mm are pressed.

A 3% aqueous solution of polyvinyl alcohol is used as a binder. Sintering is carried out at 1190

Optimal Gore

pressing 1100 ° C 200 kg / cm 1220

The density of the R-S - KG / M - 4.30

4.37

95

85

0.2

0.1

Piezoelectric modulus dj, - 10, C / H 4.90

5.85

 220 ° C with a shutter speed of 1 h. Electrodes are applied to the ground disks.

by sputtering aluminum into a vacuum of 220 ° C with an exposure of 1 hour. Electrodes are applied to the sanded discs.

me The polarization is carried out in a polysiloxane fluid with a field strength of 50-70 kV / cm.

The chemical composition of the materials is given in table. 1 their properties - in the table. 2

Table 1

0.05.74.25

0.0473.76

0.0369.37

0.0869.31 0.1074.26 0.0970.41

Table 2

1200

1190

1200 1210 1220

4.31

4.29

4.31 4.40 4.30

83

70

80 79 83

0.1

.

0.1 0.1 0.2

5.90 5.80

6.50 6.90 6.70

9.4

Piezoelectric Ceramic

Claims (1)

Formula of the invention of rottenness, it contains as MgO additives in the following ratio of material, including Li, 0, .Nb.O, of the NI components, masl :. and an additive different from 1.20-15 60 In order to reduce dielectric-NaO 15) oO-24 50 permeability, increase in volume 40. NbjO 69 31-74 26 ma piezoelectric effect, mechanical ext-MgO O 03-0 10 Editor V. Petrash Compiled by N. Sobolev Tehred L. Serdyukova Proofreader i.Erdeyi Order 5227/23 Circulation 588 Subscription VNIIPI USSR State Committee for inventions and discoveries 1130350 Moscow, Zh-35, Raushsk nab., 4/5 -Production and printing company, Uzhgorod, st. Project, 4 Continued table. 2 9.5 9.6 8.9 8.6 8.4