::Achievements

::Photo Gallery of sintered 3D parts
We work with following powdered compositions:
1. Metal - polymer and bimetal powdered compositions; 2. Functional graded powdered compositions; 3. Powdered compositions, traditionally used in technologies of Self-High Temperature Synthesis (SHS).
::Meso and Nano structures under SLS/M
Here is present some results of our researches in Meso /Micro, Nano/ - Electro - Mechanical Systems (MEMS -NEMS) synthesis.
My Teaching activity at SamGTU Russian RP links

Home Publications Presentations


Directions of Current Researches

Prof. Igor Shishkovsk(ii)y works as a senior researcher of Laboratory of Technological Lasers at P. N. Lebedev Physics Institute (Samara branch) from 1982 and has managed a research group (my CV enclosed).

For past years Shishkovsky I.V. are built the basis of fabrication of functional graded meso and micro structures and 3D tools with unique physical-mechanical and physic-chemical properties. There are proposed the results of explorations of physical and physic-chemical regularities, common for processes of Selective Laser Sintering (SLS ) powder (including exothermal) compositions.

The main results of researches have been received both methods of mathematical simulation, and experimental studies. Firstly at Russia (1998 ), Shishkovsky I.V. has been designed and built the experimental setup for SLS process, which equipped by a soft- and hard- ware complex management of processes, graphic representation of dates on geometry of a 3D parts, the most layer -by layer SLS and its interactive diagnostic.

Shishkovsky I.V. for the first time built a self-consistent continuum physical model of interaction of a laser radiation with powder compositions, fit as for a case of a laser liquid-phase sintering, as for laser controlled overlapping of SLS ands self-propagating high-temperature synthesis (SHS ) processes in reactionary capable powder mixtures during laser synthesis of 3D parts. Numerical model take into account the analysis of absorption and scattering processes in powder medium, definition of thermal properties of used compositions, their rheological behavior and a theoretical thermal model of SLS process.

The theoretical model of 3D Direct Metal Deposition (DMD) /volume Laser Cladding/ for fine-structure powder compositions was built, that permitting to define trajectories and traveling speeds of microparticles at the collateral outflow of gas with particles from a nozzle in a gravity field in dependence on an angle of delivering together with a solution of the equations of their heating and melting in a this field.

It were designed and approved the techniques for determination of optical and thermo-physical properties of powder compositions, approach for study of porous structure base on fractal approach; methodical recommendations by the searching of optimum regimes for layer by layer SLS; structurally - responsive technique of a specific resistance measurement and exploration of a shape memory effect (SME) in porous samples.

For the first time it were offered, approved in series of applications and are licensed new metal - polymer and bimetallic powder compositions (MPC and BPC) for SLS technology. Synergetic approach of several physical processes (laser treatment and a liquid-phase sintering - in case MPC; laser sintering and soldering - in case BPC) in aggregate with carrying out of an adding infiltration and annealing sintered articles (a post - process treatment) were proposed. The new degrees of freedom by management of the parameters of 3D parts with such interrelation of their physical-mechanical and physic-chemical properties which have been inaccessible earlier have allowed implementing.

For the first time it was offered and in a uniform process experimental realized, the laser controlled overlapping of SLS and SHS processes in the next powder compositions: mixtures of metals for synthesis of intermetallic in the Ni - Ti, Ni - Al, Ti - Al systems; mixtures of oxides of metals for synthesis of ceramics TiO2- ZrO2- PbO, Al (Al2O3)- Zr (ZrO2); mixtures for synthesis of the barium hexaferrite and lithium ferrites - spinels from BaO2 - Fe2O3 - Cr2O3 - Fe, Li2CO3- Fe 2O3 - Cr2O3 - Fe.

For the first time, it was experimentally shows and licensed the possibility of synthesis of porous 3D parts and tools from functional graded materials and meso porous structures via SLS method. Such approach was realized as via level-by-level of concentration changing as modeling of porous structure the future 3D objects.

Awards and grants:


::SB LPI v4.0 --> ::design by © Igor V. Shishkovsky 2008