Authors: N. Jalabadze, A. Mikeladze, R. Chedia, T. Kukava, L. Nadaraia, L. Khundadze
Affilation: Technical University of Georgian, Georgia
Pages: 297 - 300
Keywords: nanotechnology, hard matals, titanium carbide, tungsten carbide
It is known that performance of nanocrystalline hard metals suppresses that of ordinary materials. Lots of techniques for manufacturing nanopowders were developed and successfully used but preparation of nanocrystalline bulk pieces still faced certain problems: intensive grain growth upon sintering of nanopowders were making obstacles to formation of pieces in nanocrystalline state. A technology for manufacturing nanopowders of carbide materials and hard metals has been developed. The resulted materials sintered by conventional technologies were nanocrystalline pieces. However physicomechanical testing of the pieces showed that their performance was not improved to an expected level, a possible reason considered to be an excessive free carbon: remaining in the material during the synthesis and playing an important role in preserving nanocrystallinity, at the same time it makes obstacles to obtaining hard metal pieces with high performance; deficit of a charge carbon results in products comprising complex carbides and intermetallides, negatively affecting the product performance. Problems of elimination of excessive free carbon during the process of manufacturing and production of new high performance nanocrystalline hard metal pieces were solved by using a method and a device developed in the RCSR on the basis of Spark Plasma Synthesis (SPS) method.