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Home Material Sciences Ceramic Nanocomposites For New Generation Of Cutting Tools And Heavy Loaded Wear Resistive Components

Ceramic Nanocomposites For New Generation Of Cutting Tools And Heavy Loaded Wear Resistive Components

Description

We are developing the technologies of ceramic nanocomposites based on SiC-C and Si3N4-TiN-TiB2 systems for novel generation of ceramic cutting tools, wear resistive components, radiation resistive ceramic components and other potential applications, where high melting temperatures, hardness, chemical and thermal stability and other properties are successfully married. The formulaton SiC-C means nanocrystalline (40-120 nm) beta-silicon carbide reinforced with diamond planar clusters built-into the lattice of SiC. This unique structural property provides hardness round 40 GPa in pure poreless ceramics. We found hardness of 24 GPa in nanocompostes with alumina, which also show fracture toughness around 9 MPa m1/2. 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 and spark-plasma sintering. Prototypes of cutting tools (unresharpable tools) were tested at room and elevated temperatures. These composites are promising tools for extra-fine finishing of metallic parts. Hardness around 20 GPs, fracture toughness up to 8.5 MPa m1/2, keeping high stability (grain size around 80 nm) up to 800 C look attractive. The best combination of properties: hardness 24 GPa, bend strength >500 MPa, and fracture toughness of 7 MPa m1/2 was revealed for the TiN-25%Si3N4 nanocomposite. The sintering process without pressure is available to get near fully dense (98.5%) ceramics and therefore, is promising for massive production of tools. At present we propose the technology development of ceramic cutting tools based on TiN-Si3N4 ceramic nanocomposites.

Innovative Aspect and Main Advantages

Very good combination of hardness and fracture toughness at room and elevated temperatures looks attractive for cutting tool application. The technological operations are not expensive: for instance, synthesis of SiC-C is comparable with analogs by costs, pressureless sintering at moderate temperatures is used instead of hot pressing etc. The refinement of grains is 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. We have 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-Si3N4 nanocomposites.

Areas of Application

  • Cutting tools, ceramic bearings, wear resistive components
  • Cutting tools 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


Fig. 1 SiC-C nanopowders


Fig. 2 TiN - Si3N4 multilayer cutting plates (50% Si3N4 50%TiN)

Stage of Development

  • The pilot unit for SiC-C nanopowder synthesis is under operation
  • The pilot batch of cutting tools made from Si3N4-TiN nanoceramics has been prepared. Technical documentation is under preparation. We have 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-Si3N4 nanocomposites.
  • We would prefer joint development of ceramic nanocomposite products with foreign partner. Licensing of technologies or development of start-up company or joint venture is also appropriate.

Contact Details

Andrey V. Ragulya, Dr. Prof. Vice-director of IPMS
Frantsevich Institute for Problems of Materials Science of NASU
3, Krzhizhanovski str., Kyiv
Tel.(including code) +38-044-424-7435
Fax (including code) +38-044-424-2131
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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