SU1638134A1 - Piezoceramic material charge - Google Patents

Abstract

The invention relates to electronic equipment and can be used to create electromechanical transducers operating in a wide temperature range. To increase the piezo-modulus d33 of the material, the charge of the piezoceramic material additionally contains KgO in the following ratio of components, wt%: 75.78-75.83; Ti02 12.23-12.25; Mo03 11.01-11.03 and CgO 0.90-0.96. The material obtained by conventional ceramic technology from the proposed mixture has the following characteristics: & ъ / /о 90-110, tg f 0.005 - 0.009; d33 / 25-27 / xlO-2Kn / H, Tc 665-670 ° C, reversible changes of d3j in the range from 20 to 500 ° C (15-17)%. 2 tab. with Ј (L

Description

The invention relates to radioelectronic materials and can be used to create electromechanical piezoelectric transducers operating in a wide temperature range.

The purpose of the invention is to increase the pie. zomodul d33 material.

As components of the charge, oxides of grade 03, chd, TiOa (condenser), Mo03, and carbonate are used.

The components are mixed in isopropyl alcohol for 24 hours, dried, pressed into briquettes and synthesized at 700 ° C for 2 hours. After a 20-hour grinding in a shm mill in isopropyl alcohol, the slurry is dried and pressed into disks 12 mm in diameter, 2 thick. mm, using 3% polyvinyl alcohol in water as a binder. Sintering is carried out at 890–950 ° C with an exposure of 1 h. Aluminum discs are applied by vacuum deposition in grinding to a thickness of 1 mm. The samples were polarized in a polysiloxane fluid at 150 ° C and an electric field strength of 50–70 kV / cm.

The chemical composition of the charge for piezoelectric materials is given in Table 1.

a co oo

with

J

Comparative characteristics of the proposed and known compositions, determined by standard methods, are given in table 2.

In order to increase the piezmodule d 33 of the material, it additionally contains the following ratio of components, wt%:

Property

Suggested 2 I

PP

.

950900 890 900-950

90

110100 80

0.050.09.0.07 0.008

670 .670665

2726256.1

1515.17

Table2 Composition

Proposed 2 I 3

P

| Famous

110100 80

Claims (1)

Claim; The mixture of piezoceramic material, including Bi _a O ₃ , TiO ^ and Mo0 ₃ , characterized in that, in order to increase the piezoelectric module d of the material, it additionally contains K ₂ 0 in the following ratio ponents, wt.%: Bi ₂ 0 ₃ 75.78-75.83 TiOz. 12.23-12.25 Mo0 ₃ 11.01-11.03 K _z 0 0.90 -0.96 Table 1 Composition Content, wt.%, at 100 g charge Bi ₄ 0 g 1 w ι to _and about | MoOz 1 75.83 12.24 0.90 11.03 2 75.81 12.23 0.94 11.02 3 75.78 12.25 0.96 11.01 Table 2 Composition Property Proposed Famous 1 2 3 Sintering temperature, ° C 950 900 890 900-950 Dielectric constant, εΧ 90 by 100 80 Dielectric loss tgi 0.05 0.09. 0,07 0.008 Temperature Curie, ° C 670. 670 665 - Piezoelectric module DZZ 10 ⁿ C / N 27 26 25 6.1 Reversible changes d sz in inter. shaft from 20 to 500 ° C,% ^fifteen fifteen. 17 Editor M. Compiled by N. Sobolev Nedapuzhenko Tehred L. Oliinyk Proofreader L. Beskid Order 900 Circulation 444 Subscription VNIIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Plant Patent, Uzhhorod, st. Gagarina, 101