• Manish Roy

      Articles written in Bulletin of Materials Science

    • Dynamics of impact of sphere on flat surfaces of polymer matrix composites

      Manish Roy

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      The primary objective of this work was to evaluate the influence of various reinforcements and matrix materials on the dynamic hardness of polymer matrix materials (PMC). Therefore, the impact of a WC ball, using a gravity drop system, was studied on PMCs. The two parameters, coefficient of restitution and dynamic hardness, of PMCs were determined. The mechanical properties of the PMCs were evaluated, and the correlation of the two parameters with the mechanical properties of PMCs was attempted.

    • Nanoindentation and AFM studies of PECVD DLC and reactively sputtered Ti containing carbon films

      A Pauschitz J Schalko T Koch C Eisenmenger-Sittner S Kvasnica Manish Roy

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      Amorphous carbon film, also known as DLC film, is a promising material for tribological application. It is noted that properties relevant to tribological application change significantly depending on the method of preparation of these films. These properties are also altered by the composition of the films. In view of this, the objective of the present work is to compare the nanoindentation and atomic force microscopy (AFM) study of diamond like carbon (DLC) film obtained by plasma enhanced chemical vapour deposition (PECVD) with the Ti containing amorphous carbon (Ti/𝑎-C : H) film obtained by unbalanced magnetron sputter deposition (UMSD). Towards that purpose, DLC and Ti/𝑎-C : H films are deposited on silicon substrate by PECVD and UMSD processes, respectively. The microstructural features and the mechanical properties of these films are evaluated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), nanoindentation and by AFM. The results show that the PECVD DLC film has a higher elastic modulus, hardness and roughness than the UMSD Ti/𝑎-C : H film. It also has a lower pull off force than Ti containing amorphous carbon film.

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