Veriko Kinkladze

The goal of the research is preparation of SiAlON-containing composite through nitro aluminothermic processes, by the methods of reactive sintering and hot compaction.

Method: The composite CH-6 was obtained by the method of reactive sintering, with further grinding in attritor and hot compression in vacuum furnace at 1620°C, under 30 MPa pressure and 10-12 min standing at the final temperature. Precursor was prepared in a thermostat at 150°C temperature by double compression. Pressure equaled to 20-25 MPa.  Results: Physical-technical properties of specimens prepared via hot compaction were investigated. Mechanical strength at compression is 1940 MPa; mechanical strength at bending is 490 MPa; elastic module is 199.5 GPa, HV-11.6 GPa. X-Ray diffraction analysis, optical, electron microscopic and X-ray diffraction Microspectral analysis were used to investigate composite microstructure and phase composition, with raster electron microscope “Nanolab 7” of the company "OPTON”. The values of the electrical parameters of the study composites were calculated on the basis of the obtained "lg p- t" dependence.  Composite formulation was defined, the main phases of which were: β-SiAlON, corundum nano particles (‘ALCOA” Germany) and silicium carbide.                                                                                              Conclusion: Composite CH-6 has been selected from the obtained composites, which is characterized by relatively high physical-technical properties: strength, density and hardness. Materials can be used for making high refractory articles, such as jackets to secure thermocouples, furnace bedding, cutting tools for metal and wood treatment, in rocket spatial technology and others.

Key words: composite, electron, microscope, phase composition, β-SIAlON.  

Resume: Objective - to obtain SIALON containing composites by reactive sintering method in SiC-B4C-Si-Al-Al2O3 –Carbon fiber system. Using this method of synthesis, it became possible to obtain composites with different percentages of SIALON. Our task was also to study the phase composition in the SiC-B4C-Si-Al-Al2O3 system.

Method. To study the phase composition of the compo-sites, we conducted an X-ray structural analysis on the DRON-3 device, and to study the microstructure, we conducted research on an optical microscope and a ras-ter electron microscope “Nanolab 7” of the company "OPTON”.

Result. In SiC-B4C-Si-Al-Al2O3-Carbon fiber system we obtained composites with a matrix composed of: β-SIALON, silicon carbide, corundum and nano particles of boron nitride.

Conclusion. The phase composition of the obtained composite provides high physical-technical and per-formance properties of these composites. Key words: composite; electron microscope; phase composition; β-SIALON.

In the conditions of rapid development of technology, the need to obtain materials that will work while maintaining operational properties in high temperature conditions becomes increasingly urgent. The use of refractory carbides, borides and nitrides based on ceramic materials is promising in this regard.

Doctoral Thesis Referee

Master Theses Supervisor

Doctoral Thesis Supervisor/Co-supervisor

Scientific editor of monographs in foreign languages

Scientific editor of a monograph in Georgian

Editor-in-Chief of a peer-reviewed or professional journal / proceedings

Review of a scientific professional journal / proceedings

Member of the editorial board of a peer-reviewed scientific or professional journal / proceedings

Participation in a project / grant funded by an international organization

Participation in a project / grant funded from the state budget

Patent authorship

Membership of the Georgian National Academy of Science or Georgian Academy of Agricultural Sciences

Membership of an international professional organization

Membership of the Conference Organizing / Program Committee

National Award / Sectoral Award, Order, Medal, etc.

Honorary title

Monograph

Handbook

Research articles in high impact factor and local Scientific Journals

Publication in Scientific Conference Proceedings Indexed in Web of Science and Scopus