Abrasive superhard composite materials based on diamond and cubic boron nitride structured by nanocarbon binder at subatmospheric pressures intended for grinding and polishing tools and pastes

Joint Conference: International Conference on DIAMOND AND CARBON MATERIALS & GRAPHENE AND SEMICONDUCTORS

July 17-18, 2017 Chicago, USA

Poltoratskyi V.G

V.Bakul Institute of Superhard Materials, Ukraine

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

The results of work on the development of abrasive superhard composite materials based on diamond and cubic boron nitride due to structuring the powder material by carbon binder at subatmospheric pressures are presented in the paper. The use of new material results in increase of efficiency of grinding and polishing tools and pastes based on superhard materials. It was first found that during the formation of the carbon binder from carbon-containing gas (CH4) on the surface of particles in the diamond and cubic boron nitride compacts the filamentous carbon particles (whiskers), which bind the particles together, are formed under such conditions: temperature gas flow rate � 3.1 10-5 - 4.7 10-5 m3/s. It was ascertained that the formation in the structure of the compacts, specifically in space between the grains of initial SHM, globular and filamentous carbon results in increased thermal stability of the compacts, the strength of the compacts is not decreased at heating to 1474 K in argon. It was found that just addition to initial powders the micron powders of diamond or cBN of grain sizes: 3/2, 2/1, 1/0 results in increase of strength of composite by 20 % due to decrease of pore size of the composite. Experimental-industrial test showed advantages of the composite materials, a increase of durability of the grinding tool by 1.5 -3.0 times and a increase of abrasive abilityof pastes by 1.3 - 1.5 times.

Biography :

Email: vg.poltoratsky@gmail.com