INVESTIGATION OF ELASTIC PROPERTIES AND HARDNESS OF NANOSTRUCTURED CARBON MATERIALS

The elastic properties and strength characteristics of carbon materials obtained on the basis of phase derivatives of 3D-polymerized fullerite, as well as ceramic materials based on boron carbide and fullerene C-60 are investigated. The method of hot pressing in Toroid type chambers was used, varying the operating pressure, sintering time and temperature. Methods have been developed for the synthesis of such materials using catalysts based on carbon disulfide CS2 and thiophene C4H4S. To study the elasticity, the ultrasonic method of a long pulse at frequencies of 10 ... 50 MHz was used. At room temperature, the phase velocities of bulk acoustic waves of longitudinal and shear types were measured, then the values of which were used calculating the elastic modulus and Poisson's ratio (in the isotropic approximation). The hardness (Vickers pyramid was used for indentation) and crack resistance of samples synthesized under various conditions were experimentally investigated. It is shown that an increase in operating pressure leads to an improvement in the elastic properties of ceramics of compositions B4C and 50% B4C&50% C-60 synthesized using catalysts, while the best results were obtained using carbon disulfide. Comparison of B4C ceramics synthesized with and without catalysts showed that the use of a catalyst improves crack resistance. Comparison of the elastic properties of fullerite samples showed that the production of more rigid materials of this series is primarily associated with an increase in pressure, and not with an increase in temperature and duration of synthesis. Higher hardness values for both B4C-based ceramics and fullerites correlate well with an increase in elastic modulus.

Automated summary

This study investigated the elastic properties and strength characteristics of carbon-based and boron carbide materials, with specific catalysts used to improve performance. Varying pressure, time, and temperature during synthesis showed that increasing operating pressure can enhance the elastic properties. Higher hardness values were observed to correlate well with an increase in elastic modulus.