SU1361130A1 - Piezoceramic material - Google Patents

Abstract

This invention relates to piezoceramic materials used to make piezo sensors, piezo filter in radar signal processing units and microwave resonators. The invention allows to increase the phase transition temperature and reduce the sintering temperature due to the fact that the piezoceramic material contains PbO, TiO, in the form of pre-synthesized PbTiO, and in the following ratio of components, wt.%: PbTiO, 85-95; .jO, j 5-15. The piezoceramic material has the following characteristics at room temperature: a density of 7.30-7.35 g / cm, a dielectric constant of 290-320, a dielectric loss of 0.010–0, 015, a piezo-modulus dj, 37–40–10 C / H, a coefficient - Electromechanical communication env Cr 10-11%, Curie temperature 500-530 ° C, (fi aging djj after 12 months 5-7%. Table 2.

Description

The invention relates to piezoelectric ceramics and may use tbCH as filters in radar signal processing units, piezo sensors, and microwave resonators,

The purpose of the invention is to increase the temperature of the phase transition and decrease

sintering temperature.

For the manufacture of piezoelectric ceramics, the formula of the invention uses oxides of the grade chd.a., titanium piezoceramic material including PbTiOj and bismuth compound, characterized in that, to increase the phase transition temperature and lower the sintering temperature, it contains lead is synthesized for 3 hours at 850 ° C, bismuth titanate for 2 hours at 700 ° C. After synthesis, the grinding of briquettes is carried out in a shma drum in isopropyl alcohol for 20 hours. The slip is dried at 150 ° C for 5 hours, weighed according to the composition of both the synthesized lead titanate and the synthesized bismuth titanate. The components are mixed in a shmov drum in an environment of isopropyl alcohol for 20 hours. The dried slip is pressed into disks with a diameter of 12 mm and a thickness of 25 mm. A 3% aqueous solution of polyvinyl alcohol is used as a binder. The sintering is carried out at 1060-1090 ° C for 1 hour. Electrodes 30 are deposited on the ground samples using the method of vacuuming aluminum. Polarization is carried out in polysiloxane liquid at 180 ° C for

the last one

ratio, PbTiO,,

May.%:

85-95

5-15

Composition

Table I PbTiO,, 0,

g

one

2

95 90 85

ten

15

4 h with a voltage of 4560 kV / cm. Dielectric properties

measured at 10 Hz,

The chemical composition of the materials is given in table. 1, the properties of the proposed and known compositions - in the table. 2

last, 2Pri

ratio, PbTiO,,

May.%:

Composition

Table I PbTiO,, 0,

g

95 90 85

ten

15

table 2

Claims (1)

Claim Piezoceramic material, including PbTiOj and a bismuth compound, characterized in that, in order to increase the phase- ^; drum in an environment of isopropyl alcohol for 20 hours. The slip is dried at 150 ° C for 5 hours, both synthesized lead titanate and synthesized bismuth titanate are weighed according to the composition. The components are mixed in a jasper drum in isopropyl alcohol for 20 hours. The dried slip is pressed into disks 12 mm in diameter and 25 mm in thickness 2 mm. As a ligament, a 3% aqueous solution of polyvinyl alcohol is used. Sintering is carried out at 1060-1090 ° C for 1 hour. Electrodes 30 are deposited on polished samples by vacuum deposition of aluminum. Polarization is carried out in a polysiloxane liquid at 180 ° C during the transition and a decrease in the sintering temperature; it contains последнего ₄ Τί ₃ Ο ₁₂ as the last, in the following ratio, wt.%: PbTiO, 85-95 Bi ₄ Ti ₃ O, ^ 5-15 Table 1' Composition Pbtioj | Biji 1 95 5 2 _ 90 10 3 85 fifteen table 2 Properties G Indicators for the composition ² 1 3 | Famous Optimum sintering temperature, C 1090 1070 1060 1120-1140 Specific bulk density, g / cm ³ 7.30 7.35 7.32 7.45-7.56 Dielectric constant, s 320 300 290 170-190 Dielectric loss, tgS 0.015 0.012 0.010 0.020 12. Piezomodule d _J3 · 10, C / N 37 40 3 £ 23-25 Coefficient of electromechanical coupling,% 10 eleven 10 Curie temperature, ° C 500 510 530 610-660 Aging after 12 months,% 8-10