Main Sector of relevance\IRC classification 8. Industrial Manufacturing, Material and Transport Technologies
8.43 Technology of super-hard compound material production on the basis of micro- and nano- powders of cubic boron nitride for precision working of cast iron and hardened steel
Developers’ contact information
State Scientific Institution “Joint Institute of Mechanical
Engineering of the National Academy of Sciences of Belarus”
12, Akademicheskaya Str., Minsk 220072
Tel.: +375 (17) 210-07-49, fax: +375 (17) 284-02-41; e-mail: bats@ncpmm.bas-net.by
Summary
Present-day production places demanding requirements on tools and tool materials for operability assurance in conditions of high cutting speeds and load impact, intense thermal and chemical interaction with process materials. Higher and higher rate of productivity is necessary upon observance of geometry accuracy and article sizes, the quality of their operating surface. Combining high hardness, full strength and increased impact resilience, composite super-hard materials on the basis of cubic boron nitride make it possible to meet all the requirements for mechanical operation of structural parts made from hardened steel and cast iron upon production of technology elements under extreme conditions of temperatures and loads.
Description
The physical and mechanical properties of compound materials based on cubic boron nitride have been defined to depend on phase composition, thermal coefficients of incoming phase expansion, degree of dispersion and burden constituent interaction. As a rule, sintering of such materials is carried out upon high pressures of thermodynamic stability of cubic boron nitride. Presence of special high-heat compounds with some other components in the matrix makes it possible to raise the composition moldability, reduce recrystallizing processes and reverse crystalline transformation CBN → GBN (graphit boron nitride), reduce parameters of composite material sintering.
Technology type
Technical advantages and economic benefits
Main performance characteristics of composite super-hard material
based on cubic boron nitride are the following:
- ultimate compressive strength – 2, 6 - 3,2 GPa;
- coefficient of elasticity – 850 – 900 GPa;
- crack resistance – 10 – 13,5 MPa·м1/2;
- Knoop hardness number – 32 – 38 GPa;
- thermal conductivity – 100 – 120 W/ mK
- temperature resistance – 1300 К;
- composite material diameter – 7 – 12 mm.
The obtained composite material permits to perform repeated plate regrinding
what increases the service life of cutter elements that are used in cutting
bits and milling cutters by 4-6 times.
Technology differentiation and uniqueness
The technological process of production of new super-hard composite material based on cubic boron nitride with increased impact resilience for finishing and semifinishing working of hardened steel and cast iron is worked out.
Context in which technology was identified
The exhibition at the 1-st International Conference “Nanostructure materials-2008: Belarus, Russia, Ukraine”, April 22-25, 2008; Minsk: super-hard composite material based on cubic boron nitride.
Technological keywords
Super-hard composite material, cubic boron nitride, cutting tool, hardened steel and cast iron treatment.
Development Stage
Intellectual property rights
Range of applications
Manufacturing of cutting tools for hardened steel and cast iron treatment.
Classifier Used at the EU Innovation Relay Centres
Preferable Regions
Practical experience
The technological process was implemented into test field of super-hard material synthesis at State Scientific Institution “Joint Institute of Mechanical Engineering of the National Academy of Sciences of Belarus” and is tested at Minsk tractor plant.
Environmental impact
None.
Type of collaboration sought
Terms and restrictions
Availability of the necessary technological equipment, a catalogue of which is given upon technology transfer.
Available technical assistance