Fabrication of Powdery Composites Based Alumina and Its Consolidation by Hot Pressing Method in OXY-GON Furnace
In this work, obtaining methods of ultrafine alumina
powdery composites and high temperature pressing technology of
matrix ceramic composites with different compositions have been
discussed. Alumina was obtained by solution combustion synthesis
and sol-gel methods. Metal carbides containing powdery composites
were obtained by homogenization of finishing powders in nanomills,
as well as by their single-step high temperature synthesis .Different
types of matrix ceramics composites (α-Al2O3-ZrO2-Y2O3, α-Al2O3-
Y2O3-MgO, α-Al2O3-SiC-Y2O3, α-Al2O3-WC-Co-Y2O3, α-Al2O3-
B4C-Y2O3, α-Al2O3- B4C-TiB2 etc.) were obtained by using OXYGON
furnace. Consolidation of powders were carried out at 1550-
1750°C (hold time - 1 h, pressure - 50 MPa). Corundum ceramics
samples have been obtained and characterized by high hardness and
fracture toughness, absence of open porosity, high corrosion
resistance. Their density reaches 99.5-99.6% TD. During the work,
the following devices have been used: High temperature vacuum
furnace OXY-GON Industries Inc (USA), Electronic Scanning
Microscopes Nikon Eclipse LV 150, Optical Microscope NMM-
800TRF, Planetary mill Pulverisette 7 premium line, Shimadzu
Dynamic Ultra Micro Hardness Tester DUH-211S, Analysette 12
 A. Kmallik, S. Gangadharan, S. Dutta and D. Basu. Micrometer size
grains of hot isostatically pressed alumina and its characterization, Bull.
Mater. Sci., 2010, 33(4), 445–449.
 V. Lysenko, V. Mali, A. Anisimov. Microhardness of Ceramics
Obtained by Different Methods from Nanopowders of Different Oxides,
Athens J. of Sciences, 2014, 269-279.
 H. Antonio, D. Aza, J. Chevalier, F. Gilbert. Slow-crack-growth
behavior of zirconia-toughened alumina ceramics processed by different
methods. J. Am. Ceram. Soc., 2003, 86(1), 115-120.
 Chih-Jen Wang, Chi-Yuen Huang, Yu-Chun Wu. Two-step sintering of
fine Alumina-zirconia ceramics. 2008, Available online at www.
 M. Zakeri, M. R. Rahimipour. Effect of cup and ball types on mechanochemical
synthesis of Al2O3-TiC nanocomposite powder. Ceramics–
Silikaty, 2012, 56(2), 130-134.
 V. Naglieri, P. Palmero, L. Montanaro, J. Chvalier. Elaboratorion of
Alumina –Zirconia composites: Role of the Zirconia Content on the
Microstructure and Mechanical Properties. Materials, 2013, 6, 2090-
 M. Vlasova, N. Kakazey, I. Rosales and al., Synthesis of Composite
AlN-AlON-Al2O3 powders and ceramics prepared by High-pressure
sintering. Science of Sintering, 2010, 42, 283-295.
 US 8030234 B2, 2011. Aluminum boron carbide composite and method
to form said composite.
 Lu Shen, Chunfeng Hu, Yoshio Sakka and Qing Huang. Study of phase
transformation behaviour of alumina through precipitation method. J.
Phys. D: Appl. Phys, 2012, 45, 215302(6pp). doi:10.1088/0022-
 T. Kuchikhidze, N. Jalagonia, Z. Phachulia, R. Chedia. Transformation
of Aluminum Oxyhydroxides in α-Al2O3 in Presence of Various Seeds.
International Science Index (ICEMA) 2015, 17, 1303-1307.
 N. Jalabadze, R. Chedia, T. Kukava, L. Nadaraia, L. Khundadze.
Development of new high performance nanocrystalline hard metals.
Nanotech., 2008, 1, 213-216.
 Jalabadze Nikoloz, Mikeladze Archil and Chedia Roin. New Technology
for the Manufacturing of Nanocrystalline Materials. Second IEEE
Conference on Nanotechnology - IEEE-NANO’ 2002, August 26-28,
2002, Washington DC, USA.
 N. Jalabadze, A. Mikeladze, R. Chedia, T. Kukava, L. Nadaraia and L.
Khundadze. Development of New High Performance Nanocrystalline
Hard Metals. Nanotech., 2008. NSTI Nanotechnolgy Conference and
Trade Show. June 1-5, 2008, Boston, MA, USA. V.1, p. 297-300.
 Nikoloz V.Jalabadze, Roin Chedia, Tengiz Kukava and Lili Nadaraia.
Development of New Technologies for the Manufacturing of
Nanocrystalline Scintillation Materials. IEEE Transactions on Nuclear
Science. 2008, 55(3), 1514 – 1522.