Multilayer ceramic heterostructure with magnetoelectric effect and method for production thereof

FIELD: physics.

SUBSTANCE: invention relates to making magnetoelectric converters used as a base for magnetic field sensors, microwave electronic devices, for magnetoelectric information recording technology and for electromagnetic energy and vibration energy storages. The method involves forming a stack of alternating magnetostrictor and piezoceramic layers. Said stack is formed in three steps: first, electroconductive contacts are deposited on the entire surface of magnetostrictors; all surfaces of magnetostrictors and piezoceramic, except end surfaces, are coated with a layer of electroconductive epoxy adhesive, after which a stack of alternating magnetostrictor and piezoceramic layers is formed. The layers are joined by pressing at temperature of 60-100°C and excess pressure of (1.3-2.6)·105 Pa. The multilayer ceramic heterostructure contains 9-11 magnetostrictor and piezoceramic layers. The piezoeceramic layer has thickness of 0.10-0.13 mm and the magnetostrictor layer has thickness of 0.25-0.30 mm.

EFFECT: low power consumption and high sensitivity.

2 cl, 2 tbl, 4 dwg

 

The invention relates to electronic equipment, namely: creation of magnetoelectric transducers used as the basis for sensors of magnetic fields, devices, microwave electronics, fundamentals for technology magnetoelectric information recording and storage of electromagnetic energy and the energy of the vibrations.

The invention is illustrated graphic materials (Figure 1÷4, Table 1÷2).

Figure 1. Multilayer ceramic heterostructure with magnetoelectric effect.

1 - layer conductive glue; 2 - piezoceramics; 3 - magnetostrictor; 4 - conductive contact.

Figure 2. Based magnetoelectric response of voltage value of a constant magnetic field at the frequency of one of the resonances.

Figure 3. The prototype of the proposed device. The sensors of a constant magnetic field.

a) a single-element sensor; b) - dual element sensor with extended range static magnetic field;

1 - conductive contact; 2 - piezoceramics; 3 - magnetostrictor; 4 - the magnetizing coil.

Figure 4. Tube furnace to connect the elements of the package.

Table 1. Characteristics of the layered structure with magnetoelectric effect obtained by the present method.

Table 2. The main parameters of the electrically conductive adhesive.

The known method recip is of layered heterostructures with magnetoelectric effect (M.I. Bichurin, Petrov V.M., Petrov R.V. Ferroelectrics, 2002, v.280, p.199-202, prototype), including:

- formation of a package of alternating layers of magnetostrictor and piezoceramics method of slip casting;

connection of the layers of the package substrate at a temperature of 1200°C in a tubular or chamber of the furnace;

- polarization ceramics by application of voltage with the intention of inducing piezoelectric activity;

- cutting package to products of the desired size.

Features of this method:

- high energy consumption for the formation of a package of alternating layers of magnetostrictor and piezoceramics method of slip casting and sintering the layers of the package.

- low sensitivity of the finished product to constant and alternating magnetic fields.

The technical result of the proposed method is that it is characterized by low energy consumption and the possibility of obtaining the finished products with high sensitivity to constant and alternating magnetic fields.

The technical result is achieved by the fact that the formation of the package is performed in three stages: first, on the entire surface of magnetostriction applied electrically conductive contacts, then all surfaces of magnetostriction and piezoelectric ceramics in addition to the face covered with a layer of electrically conductive epoxy adhesive, after which the package is formed by alternating layers of magnetostrictor and is of esotermici, the bonding is carried out by pressing at a temperature of 60÷100°C and a gauge pressure (1,3÷2,6)·105PA.

A study of the level of technology found that methods of obtaining layered heterostructures with magnetoelectric effect, containing formation package in three stages: first, on the entire surface of magnetostriction applied electrically conductive contacts, then all surfaces of magnetostriction and piezoelectric ceramics in addition to the face covered with a layer of electrically conductive epoxy adhesive, after which the package is formed by alternating layers of magnetostrictor and piezoceramic, bonding is carried out by pressing at a temperature of 60÷100°C and a gauge pressure (1,3÷2,6)·105PA is not detected.

A method of obtaining a layered heterostructures with magnetoelectric effect (M.I. Bichurin, Petrov V.M., Petrov R.V. Ferroelectrics, 2002, V.280, p.199-202, prototype)

Distinctive features of the proposed method in comparison with prototype:

in a known method of forming a package of alternating layers of magnetostrictive and piezoelectric ceramics by slip casting, and declare the formation of the package occurs in three stages: first, on the entire surface of magnetostriction applied electrically conductive contacts, then all surfaces of magnetostriction and piezoelectric ceramics, in addition to the face, covered the forefront conductive epoxy adhesive, after which the package is formed by alternating layers of magnetostrictor and piezoceramic, bonding is carried out by pressing at a temperature of 60÷100°C and a gauge pressure (1,3÷2,6)·105PA

in the known method the layers of the package are connected by sintering at 1200°C, while in the present - pressing at a temperature of 50÷100°C and a gauge pressure (1,3÷2,6)·105PA;

a well - known method includes the stage of the polarization process after the formation of the structure by the application of voltage, in the present method this stage is absent.

Known layered heterostructure with magnetoelectric effect (patent for invention №2244318, 2005, prototype), containing alternating layers of magnetostrictive and piezoelectric ceramics (Figure 3).

The known device comprises a conductive contact 1, the layer of piezoelectric ceramics 2, magnetostrictor 3 and the magnetizing coil 4.

A disadvantage of the known device is its low sensitivity to constant and variable magnetic fields.

The technical result of the claimed device is that the sensitivity of the layered heterostructure with magnetoelectric effect to a constant magnetic field can reach 3.5·10-6T, to an alternating magnetic field 80·10-9So the Maximum value of the coefficient of magnetoelectric conversion is 45 V/cm·OE) and observed near piezomechanical resonance at the frequency f=144 kHz, the material is close to magnetic saturation µoHDC=5 MT, simulating field µoHDC=0,15 MT; no voltage drop on the dielectric layers of magnetostrictive ceramics by creating a conductive layer on the surface of the ferrite plates; the sensitivity of the DC and AC fields is 3.5·10-6T and 80·10-9T, respectively; the range of operating permanent field 0÷0,12 T, variable field 0÷0,06 So

The technical result is achieved in that the device contains 9÷11 alternating layers of magnetostrictive and piezoelectric ceramics, the thickness of the layer of piezoelectric ceramics - 0,10÷0.13 mm, magnetostrictor - 0,25÷0,30 mm

Distinguishing features of the claimed device in comparison with prototype:

in the known device the thickness of the layer of piezoceramic and magnetostrictive less than 70 μm, and declare the thickness of the layer of piezoelectric ceramics - 0,10÷0.13 mm, magnetostrictor - 0,25÷0.30 mm (Generated voltage in the piezoelectric layers is proportional to the thickness, to the same absolute deformation caused by magnetostrictive proportional to the thickness of the magnetic layer. Both these factors increase the output electromagnetic signal, making it easy detection);

- dielectric layers of magnetic material electrically short-circuited, by applying to the surface of the magnetic the ceramic electrically conductive contacts. This eliminates the voltage drop across the dielectric layers magnetostrictor.

Description of the invention

Composite ceramic heterostructure can be considered as a battery of series-connected capacitors of piezoelectric ceramics. Each piezo battery is mechanically rigidly connected with ceramic magnetic materials, magnetostrictive ferrites. Layers of ferrite in turn completely covered with electrically conductive contacts, which provides electrical contact between the layers piezoactive material. All overall composite heterostructure mechanically solid.

When the change in the magnetic field changes of dimensions of the ferrite due to magnetostriction, which causes mechanical stress on the piezoelectric elements, this leads to the emergence of a potential difference on each piezoelectric element and the total potential difference between the upper and lower metallization layers composite heterostructure in General; the change in the boundary conditions of equations of state of the piezoelectric ceramics in the piezoelectric elements, this leads to a change in the dielectric constant and, accordingly, the capacity of heterostructures in General; changes in the elastic properties of heterostructure and its size, this leads to identiy frequency resonance and entirety the sa of the various modes of oscillation. In such a composite ceramic structure can be measured:

the potential difference arising between the top and bottom metallization layers of the composite heterostructures;

- capacity heterostructures, which is largely a dielectric constantε33T/ε0piezoceramics and dimensions of the piezoelectric elements;

the resonance frequency offriand antiresonancefaithat are determined mainly by the oscillation modes, sizes and elastic characteristics of the composite heterostructures in General.

An example of the method

Was made a number of samples layered magnetoelectric heterostructures created by technology.

The size of the structure, a multilayer composite ceramic heterostructure based on magneto - and piezoactive materials and number of layers selected taking into account the maximum value of the magnetoelectric response of the heterostructure and the technical parameters required for sensors measure magnetic fields.

The technology is convenient ski size ranges: - length L~(5-30) mm; - width of W~(5÷30) mm; - height H~(0,15÷3) mm Thickness of ceramic layers of magnetostrictive ferrites t1and piezo t2may vary in the range ~ (30÷300 microns).

The package consisted of 11 alternating layers piezoactive material sjpc-46 and magnetostrictive material Nickel-zinc ferrite composition Ni0,8Znof 0.2Fe2O4.

The manufacture of packages multilayer composite heterostructures occurred by gluing layers of ferrite and piezoactive layers, with subsequent podbrezova and low-temperature annealing.

As a material for the formation of a strong mechanical connection between the layers was used conductive epoxy adhesive TDS CW2460. The main parameters of the glue is presented below in Table 2.

To ensure electrical contact between the layers of piezoelectric ceramics on the surface of the ferrite plates were deposited silver electrodes. The thickness of the layer of conductive material made of an alloy of silver and palladium, choose technologically minimum - order h~(1,5÷6,0) microns.

After gluing layers, the package was placed in a clamping device and annealed in order at a temperature of 60÷100°C in a three-zone tube furnace TZF 15/610 in air atmosphere (Figure 4).

The magnitude of the magnetoelectric effect in planar structures characterizes the ratio TE-ol is education k. Another important indicator is the sensitivity of the sensor to constant and variable fields. For this heterostructure as a sensor of magnetic fields is important to have a linear relationship between the external field and the voltage taken from the plates of the composite.

Characteristics of the device obtained in this way are presented in Table 1.

The inventive method was tested in the laboratories of the Tver state University to obtain samples of the multilayer ceramic heterostructures with magnetoelectric effect.

The inventive layered structure with magnetoelectric effect can be used as the basis for magnetoelectric transducer constant and slowly changing variable magnetic fields.

Table 1
Factor me-conversion k, V/cm*OEThe sensitivity constant field, TThe sensitivity of the AC field, TOperating constant, TThe range of operating variables, TThe range of linearity of the composite T
Max. the value of 45 V/cm*OE is Observed near piezomechanical resonance G=144 kHz, the material is close to magnetic saturation µoHDC=5 MT, simulating field µoHAC=0,15 MT3.5*10-680*10-90-0,120-10-0,005

Table 2
Test methodValue
The minimum operating temperature, °C-55
The maximum operating temperature, °C150
Freezing time
At 24°C, h5
At 65°C, min.15
While working with the material at a temperature of (22VC), min10
The ratio of components1:1
The specific volume resistance at a temperature of 25°C, Ohm×cm3MIL-STD-883E NOTICE 3, method 5011,40,038
The tensile strength, kgf×cmASTM-D-638-02A70
Elongation, %ASTM-D-638-02A0,3
The limit of compressive strength, kgf×cm2ASTM-D-638-02A77,34
Power bending, kgf×cm2ASTM-D-790-030,1758
The tensile-shear, kgf×cm2ASTM-D-732-0216,45
The impact strength of the sample with cuts Izod, j×m2ASTM-D256-02 1819,59
The coefficient of thermal expansion, mm/mmASTM-E-831-0379,3×106
Density, g/cm3ASTM-D-256-02 E12,34
ASTM C-5180,578

1. A method of obtaining a multilayer ceramic heterostructures with magnetoelectric effect, containing formation package alternating layers of magnetostrictor and piezoceramic, characterized in that the formation of the package is performed in three stages: first, on the entire surface of magnetostriction applied electrically conductive contacts, then all surfaces of magnetostriction and piezoelectric ceramics, in addition to the face, covered with a layer of electrically conductive epoxy adhesive, after which the package is formed by alternation of 9÷11 layers of piezoelectric ceramic-magnetostrictor thickness 0,10÷0.13 mm and 0.25÷0.30 mm, respectively, the connection of the layers is carried out by pressing at a temperature of 60 to 100°C. and a gauge pressure (1,3÷2,6)·105PA.

2. Multilayer ceramic heterostructure with magnetoelectric effect, containing layers of piezoelectric ceramics and magnetostrictor, characterized in that the number of layers of piezoelectric ceramic-magnetostrictor equal to 9÷11, the thickness of the layer of piezoelectric ceramics 0,10÷0.13 mm, magnetostrictor 0,25÷0,30 mm



 

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