Department of nanostructural functional materials

Themes of fundamental researches:

Research of influence of ordered crystalline texture and nanoscaled structures on properties of leadless piezoceramics: synthesis and consolidation, textures and nanostructures forming , electrophysical properties (years 2007-2009)
Piezoceramics under extreme conditions: forming of nanostructures, electrophysical properties, technological aspects (years 2007-2009)

Research of influence of nanoscaled crystalline structures on electrophysical properties of piezoceramic functional materials made on the basis of hard Lead ZT solutions (LZT, Lead zirconate - titanate) (years 2007-2009)

Plant for casting ceramic tape

Contractual works:

Development of piezoceramic elements (РЕ). РЕ are used in the devices of the seismic forecast for methane emissions in the coal mines (year 2008)

Maximal sensitiveness of pezomaterial and minimum level of own noises are got. The concordance of the vibroacoustic system parameters of seismic receiver (mass of inertial load, construction of head) with the parameters of РЕ (diameter, thickness, polarization) allowed to secure basic technical descriptions of the APSS-1-1 apparatus

Apparatus of transmission of seismic - acoustic signal APSS-1-1

New approach based on the use of phase transformations both in the process of getting new materials and forming of the improved physical and operating parameters of wares is developed and used

Methods of getting nanostructural piezoceramic out of Lead ZT (LZT) materials are developed. Given methods include combination of chemical, mechanical and thermal influences which allow to manage properties of ceramics at all stages:

synthesis of precursors,
thermal synthesis of crystalline powders out of precursors,
caking and polarization.of ceramic

There exist following parameters of nanostructures: size of crystallites, size of granules, character of borders between granules, porosity etc. The parameters influence on electrophysical properties. Examined mechanism of this influence allowed to use nanotechnologies for creation of functional piezoceramic materials (FPM) of a new generation for the medical technique, seismic sensors, systems of the guard signaling, powerful ultrasonic emitters etc.

Experimental sample parties of piezoceramics wares for different purposes have been made for protocol tests on users' request. The wares have specific complex of unique properties

Sample parties successfully passed tests in following industries of Ukrainian economy:

Medical ultrasonic apparatus for therapy,
meters of gas for arterial pipelines
seismic sensors for prognostication of methane emissions in the coal mines
other industries.

On the basis of nanostructural piezoceramics STC «Reactivelectron» can presently develop and make piezomaterials (PM) and piezoelements (PE) with the properties exceeding best foreign analogues serially produced.

Devices and apparatus with improved technical descriptions can be made on the basis of PM & PE. Descriptions are as follows:

high sensitiveness,
low level of intrinsic noises,
high maximum-possible power of ultrasound generation
wide range of working temperatures,
long - durable temperature stability,
high firmness to action of penetrable radiation.

GETTING OF NANOPOWDERS FOR FUNCTIONAL CERAMICS

We have created pilot plant for following purposes:

dissolution of high-toxic Si, Ti, Sn, Pb tetrahlorides
sedimentation of dioxides titan & zirconium nanopowders
sedimentation of Pb, Ba, Sr titanates and zirkonates
sedimentation of nanopowders materials for radioelectronic technique (piezomaterials, condensers, pozistores etc.);

Perovskite phase temperature of synthesis (crystallization) of the material declines on 200-250 ⁰ С thanks to surplus energy of nanopowders.

Temperature of sintering also declines substantially.

The use of nanopowders in production of piezomaterials and condenser materials, construction ceramics and refractory materials allows:

to get high-dense and high - resistant (mechanically and acoustic) ceramics with lower temperature of synthesis and sintering
to substitute platinum electrodes by silver ones or others when making multi-layer condensers and piezoelements,
to synthesize and sinter oxide compounds which are not synthesized on the traditional ceramic technology or synthesized only at temperatures higher 1300⁰С;
to lower power inputs and decrease a wear of electro-thermal equipment;
to provide ecological safety of production by reducing evaporation of volatile components (for example, PbO).

Last modification: 03/27/09 09:43