SU833833A1 - Piezoelectric ceramic material and its production method - Google Patents

Description

; 54). PIEZOELECTRIC CERAMIC MATERIAL

The invention relates to piezoelectric ceramics used in high frequency equipment as resonators having a high temperature stability of a resonant frequency, filters, delay lines, electromechanical transducers. A piezoelectric based material is known. The disadvantages of this material are relatively low Curie temperature (T), high dielectric constant and high rhenium. Closest to the present invention is a piezoelectric ceramic material containing PbO, TiOji, La20} and / or. The material is obtained by mixing the initial components of the mixture with grinding, synthesis, grinding the blanks and burning them to obtain a compact material p T. The disadvantages of this material are low piezoelectric properties, mechanical strength, which limits its use, and high sintering temperature. The purpose of the invention is to increase the piezoelectric properties, reduce the temperature and extend the sintering interval. The goal is achieved due to the fact that the piezoelectric ceramic material, including PbO, TiOct, ,, and / or, additionally contains Nd, j0.j and SiO in the following ratio of components, wt.%: 24-26 0.2-4, 0 and / or Sm., 0 0.05-4.0 0.1-0.7 Else, Moreover, in the method of manufacturing a piezoelectric ceramic material, including mixing the components of the charge, grinding, synthesis, grinding, forming blanks and burning them, part of the initial components in the amount of 1-5 wt.% is introduced into the mixture in the form of pre-fused glass of the following composition, m .% With: 4-4.3 9.5-9.8 5,9-6,1 13,4-13,8 Other

In the manufacture of material using raw materials brand chd. The components are mixed in a shma drum in isopropyl alcohol for 12 hours, the slip is dried at 150200 ° C and synthesized at 850 ° C for 4 hours. After synthesis, briquettes are crushed again in a shma drum, where the ground pre-cooked. After drying, the sample is pressed using a 3% aqueous solution of polyvinyl alcohol as a binder. Samples are sintered at 1160-1210 ° C for 1 h,

After grinding, aluminum was deposited on the samples by vacuum deposition.

electrodes and carry out the polarization of samples in polysilicone oil at 1700–200 ° C for 4 h in a constant field with a strength of 40–50 kV / m.

The table shows the compositions and properties of the proposed material.

From the table it can be seen that the introduction of 1-5% glass additive at the indicated ratio of oxides in the material provides high piezo properties: high values of piezomodules and low dielectric constant. In addition, the use of the proposed charge and method allows the use of a sufficiently low sintering temperature (IBO-IBO C) with a wide 5 sintering interval.

Claims (2)

Claim 1. Piezoelectric ceramic material, including PbO, Ti0 ₂ , Ba ₂ 0z and / or 5σι ₂ θ3> characterized in that, in order to increase the piezoelectric properties, lower the temperature and extend the sintering interval, it additionally contains Nd ₂ 0j and Si0 ₂ at the following ratio of components, wt.% ·: T ΐθ ₂ 24-26 LanOn and / or Sm „0a 0.2-4.0 Nd ₂ 0 ^ 0.05-4.0 S i 0 ₂ 0.1-0.7 Pbo Rest 2. A method of manufacturing a piezoelectric ceramic material, comprising mixing the components of the mixture, grinding, synthesis, grinding, molding of preforms and firing them, characterized in that 40 part of the starting components in an amount of 1-5 wt.% Are introduced into the charge in the form of pre-fused glass of the following composition, wt.%: T i0 ₂ 4-4,3 45 L a ₂ 0 ₃ 9.5-9.8 Nd ₂ O ₃ 5.9-6.1 S i 0 2 13.4-13.8 Pbo Rest units Sources of information taken into account during the examination 1. Japan patent No. 49-29396 /, CL G 2 C 23, published. 1974. 2. French Patent No. 1553190, 55 cells From 04 to 35/00, published. 1968.