Recommended application field: Cutting tools, ceramic bearings, wear resistive components. Cuttingtools made from Si3N4-TiN nanoceramics were tested in ALCON (Kiev, Ukraine). Wear resistive components based on SiC-C ceramics were examined in Baker Hughes INTEQ GmbH.

Advantages over analogues: Avery good combination of hardness and fracture toughness at room and elevated temperatures looks attractive for cutting tool application. Technological operations are not experensive: for instance, synthesis of SiC-C is comparable with annalogues by costs, pressureless sintering at moderate temperatures is used instead of hot pressing etc. Refinement of grains a desirable property for finishing treatment of alloyed steels and viscous metals and alloys. Stability of properties at high temperatures is promising for dry cutting operations. Wehave a patent of Russian Federation concerning technology of SiC-C nanopowder synthesis, pending patents of Ukraine and know-how in technologies of TiN-TiB2 and TiN-S3N4 nanocomposites.

The development stage readiness: Tested experimental exploitation order

Description of the development:
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We present technologies for development of ceramic nanocomposites based on SiC-C and Si3N4-TiN-TiB2 systems for using in for using in novel generation of ceramic cutting tools, wear resistive components, radiation resistive ceramic components and for other potential applications. Such propertiesas high meting temperatures, hardness, chemical and thermal stability and other are successfully combined in them. Formula SiC-C means nanocrystalline (40-120 nm) betasilicon carbide reinforced with diamond planar clusters built-info the lattice of SiC. This unique structural property provides for 40 GPa hardness in pure poreless ceramics. We found hardness of 24 GPa in nanocompostes with alumina, which also show fracture toughness around 9 MPa-m[1/2]. As a result of NATO SfP project we have built the pilot unit for production of 20 kg of SiC-C nanopowder a day. Here we propose the technology development of the nanocomposites based on SiC-C nanopowders. Another group of nanocomposites based on nano-TiN reinforced with nano TiB2 and Si3N4 particles was obtained by sintering, high-pressure sintering. Prototypes of cutting tools (unresharpable tools) were tested both at room and elevated temperatures. These composites are promising tools for extra-fine finishing of metallic parts. Such parameters as hardness around 20 GPs, fracture toughness up to 8.5 MPa-m[1/2], show high stability (grain size around 80 nm) up to 800 C which looks attractive. The best combination of properties: hardness 24 GPa, bend strength > 500 MPa, and fracture toughness of 7 MPa-m[1/2] was revealed for the TiN-25%Si3N4 nanocomposite. With sintering process without pressure near fully dense (98.5%) ceramics can be achieved and therefore, such process is promising for mass production of tools. At present we propose development of technology for ceramac cutting tools based on TiN-Si3N4 ceramic nanocomposites.

Information about newness of the development:
there are Ukrainian patents -- 1 items
there are patents of other countries -- 1 items

corresponds technical description
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Country Ukraine

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E-mail: gal@uintei.kiev.ua