LV10134B - Piesoelectric composite material from ceramic and organic polymer - Google Patents

Abstract

Invention refers to piezoelectric composite materials used in radio electronics, medicine and other branches of engineering for transforming mechanical parameters into electrical signals and vice versa.To increase range of material work alternating current frequencies without loss of piezo sensitivity, it is offered to produce piezoelectric composite material containing as a functional filler lead zirconate titanate ceramic powder and as a binder - polymethacrylate or polybutylmethacrylate, percentage of weight:lead zirconate titanate ceramic powder - 60;polymethacrylate group material- 40;Composite material is obtained by mixing in roll mill ceramic powder with a polymer binding substance. By applying a silk screening method, the viscose mass is put on a base as a composite film of different configuration. The film consists of polymer with hard powder conglomerates included evenly in the volume.

Description

PIEZOELECTRIC COMPOSITE MATERIAL OF CERAMIC AND ORGANIC POLYMER.

The present invention relates to piezoelectric composite film materials used in radioelectronics, medicine, measuring equipment and any electromechanical, mechanically electric, electromechanical electric converter in an unlimited frequency range. ί

In ultrasonic devices, where piezoelectric cells act as generators or ultrasonic detectors at several 100 kHz, polymeric piezoelectric films derived from polyvinylidene dichloride, copolymer vinyl denorphide - tetrafloroethylene and trifluoroethylene are used / 1 /. The disadvantage of these polymer films is that resources are wasted, "In short. this. recrystallize phase 06 of the substances in polarizable Ά form / 2 /, weak piezo effect (piezo-modules: 18.ΙΟ ^'15 , 2.10 ¹² , 10.IO' ¹² KL / N) / 1 /. '·

The closest to the technical solution is the piezoelectric lead zirconate titanate ceramic, which consists of a solid solution of formula Pb ₍₁ - _2/3 ) J _a [^ / ^ 2 / ^^^ / ^ 2 / ^ - ^^ 1, ^where M - elements of La, Nd group, x + y + z »1; a 0.005-0.03; b 0.5-0.95; x = 0.1-0.4, y «0.3-0.5, z« 0.2-0.5, and · 0.5% w / w Mn0 ₂ additive (E Pat. No. 0423822, cl. C04B 35/49) / 3 / prototype / The lack of ceramic details in their masses, which limits the working frequency range, hard to reach close contact with the work surface, relatively small bending amplitude, relatively low sensitivity.

The object of the present invention is to increase the AC operating frequency of the material without losing high piezo sensitivity.

To produce material that works at high AC frequencies without loss of piezo sensitivity, we offer a piezoelectric composite film material that uses a lead zirconate titanate ceramic / eg 3-7 / powder (grain size 2-4and a polymer of a resilient binder polymethacrylate group which polarizes due to the presence of carbon (2 hydrogen atoms per carbon).

- 2 0¾

0¾ »0-0-0.

0.

CHg

Rl - C - R ^ * 2

Polymethacrylates are · used in ceramic technology to produce plastic forming mass (W0 pat.Kr.90A57S4-, kl.C04B

35/00, C083 · 63/08, C07C 59/01) / 8 /. These polymers are burned during the sintering process. The use of piezoelectric composite material in general and also piezoelectric composite films for the production of PbTiO ^ -FbZrOj system polyethyl acrylate powder mixed with electroelectric ceramics is unknown in the manufacture of radioelectric and apparatus building materials. '·

The piezoelectric composition film material is obtained by pre-synthesizing the ceramic material of the PbTiO ^ -PbZrO ^ system using some known ceramic material preparation technologies / 3-7 / ·

To obtain a composite film filler, the sintered ceramic was ground in a hammer mill and ground in a ball mill to a particle size of 2-4 µm. The resulting powder is mixed with 40-60% w / w in a 0.5 h roll mill with 40-60% w / w polymethacrylate binder consisting of 60-80% w / w polymer solvent and 20-40% w / w composition material. - polymethacrylate. Use fast-evaporating solvents for grease, varnish, paint and oils / 9 /. The binder is obtained by mixing the solvent with polymethacrylate in a tightly closed container for up to 25-50 hours. a homogeneous mass with a viscosity of 1.4-2.2 'Pa / s is obtained. The binder is passed through a brass sieve 0125 before use.

Viscous composite mass for 5 min. during the screening process, it is applied on a chemically inactive surface necessary for production in thicknesses from 5 / ^ 0 /. On the substrate, a resilient and mechanically resistant composite film consisting of uniformly distributed ceramic powder conglomerates surrounded by a polymer is obtained. The polymer provides mechanical load transfer from one piezo-ceramic particle to another., The mechanical and chemical properties of the resulting film allow the film to be removed from the substrate by means of water. Apply electrically conductive electrodes to the film and polarize in an electric field of 50 kV / cm in silicone oil at 340 K.

Example: Material of piezoelectric composite film.

Segoelectric ceramic powders 99.5% ^ (1-2 / 3 0 013 ^Srd 0.013 (N'i1 ^ Nb2 ^) 02 ^ / 2 ^ 2/3 ^ 0.2 ^Ti 0.4 ^Zr 0.4 ° 3 ^{1111 mass} · KnO2 / 3/60% w / w mixed in 0.5 hour roll, mill 40% w / w binder containing solvent tetralin (TN 33-2-44-58) w / w and 30% w / w composition material Polybutylmethyl acrylate suspension (ΡΕΜΑ) (TN 6-01-252-68) The viscous mass is deposited on a décolletage paper VST 10015-75 for 5 minutes in a silk screen printing technique. thick film on both sides

apply 2 // ^ thick silver electrodes and polarize as described above. Heating this material up to 340 K can form piezoelectric electrodes of any configuration.

Compared to known bulk piezo-ceramic details of the PbTiO ^ -PbZrO ^ system, the same piezo effect can be achieved by starting

film. Thanks to the thin film design of the composition, there is an unlimited frequency field. The plasticity of the film allows it to be developed in hardware closer to the work surface than is possible with ceramic. Compared to ceramics, the high bending amplitude and film thickness result in a much higher material sensitivity (see Table 1).

Compared to the polymeric piezo-film, the proposed composition films have a higher piezo-sensitivity. Piezo-module 10 times larger (see table). Polymethacrylates used in the composite film do not need to be recrystallized unlike polyvinylen dichloride, copolymer vinyl dichloride-tetrafloroethylene and trifloethylene, since the polymethacrylates contain? carbon. Piezo electric composition film is subjected to mechanical treatment, extrusion of parts at temperatures up to 390% · Mechanical and electrical properties ensure component life for 4-5 years.

These electromechanical properties allow the use of the proposed piezoelectric composition film material in the manufacture of various electrical and electronic devices, incl. tensor transducers, press endevers, microphones, buzzer, telephones, hydrophones, medicine as heart noise detectors, blood pressure detectors, pulse monitors, etc.

Table 1

Composition and properties of materials

Name of the material Plavera forest forest, Ra conc., JUM% Polybutamethacrylate binder concentrate,% w / w Electrical properties Alternate frequency for measuring kHz ^d 3i; ₁₂ .10 KL / N % (Analogs 1) Polyvinyl floride Of 5 - - 20th 18 · 360 10 ¹⁰ 99.5% by weight 100 1980 61.6 171 1260 10 ⁵

^ (1-2 / 3) .0.013 ^ 0.013 (^ 1/3 ^ 2/3 ^ 0.4 ( ^Zr l / 3 ^ 2/3 ^ 0.2 ^Ti 0.4

7.τ »Π_ 11 η Π 9 τη o e

MnOg / Prototype 3 / Composite film / 3 / ceramic + polybutamethylcrylate binder) 5 60 40 280 68.0 190 1308 io ⁸ Composite film 10th 60 4Q 302 69.0 201 1302 10 ⁸ Composite film 30th 60. 40 112 62.0 160 980 10 ⁸ Composite film • 4 60 40 23rd 18th 20th 880 10 ⁸ Composite film 35 60 40 281 68.0 189 801 10 ⁸ Composite film 10th 40 60 290 68.5 198 880 10 ⁸ Composite film 10th 5 ° 50 250 .67.8 178 878 10 ⁸ Composite film 10th 70 30th 480 53.4 • 91 215 10 ⁸ Composite film 10th . 30th 70 21st 23rd 30th 98 10 ⁸

1. Marcus k.A. Perroelectric polymers and their applications.Eerroelectrics, 1982. Vol.40.- No.l.- Pp.29-41.

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Claims (2)

Formula of the Invention 1. Piezoelectric composite film material containing lead zirconate titanate ceramic powder, characterized in that the binder is polymethacrylate group materials at a percentage by weight of components: lead zirconate titanate ceramic powder - 60; polymethacrylate - 40. Piezoelectric composite film material according to claim 2 1. A process according to claim 1, wherein the material of the polymethacrylate group is polybutamethacrylate.