|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Frontiers in Advanced Functional Thin Films and Nanostructured Materials
||Superhard Q-carbon Nanostructures Formed via Nanosecond Laser Melting and Ultrafast Quenching
||Siddharth Gupta, Ritesh Sachan, Anagh Bhaumik, Punam Pant, Roger Narayan, Jagdish Narayan
|On-Site Speaker (Planned)
On irradiating with a nanosecond laser pulse, carbon melts and forms densely-packed Q-carbon. The increase in undercooling led to ultrafast regrowth rate, forming Q-carbon nanocomposite. These Q-carbon nanostructures have a cellular size of 1 μm providing conformal coverage on sapphire. The composite has hardness of 67 GPa, Young’s Modulus ~843 GPa in comparison to 24 GPa hardness, 325 GPa Young’s Modulus of DLC. The nanocomposite and DLC have 0.16 and 0.65 energy dispersion coefficients, resulting from the increased hardness of Q-carbon. The soft <I>sp<SUP>2</SUP></I> rich α-phase provides lubrication, reducing friction coefficient to 0.09 and wear rate to 1.55x 10<SUP>-5</SUP> mm<SUP>3</SUP>/Nm. The isothermal M-H plots confirmed RTFM in the composite structure with 150 Oe coercivity, 22.31 emug<SUP>-1</SUP> M<SUB>s</SUB> and ~600 K T<SUB>c</SUB>. These properties have been correlated with the regrowth velocity. The hardness coupled with conformal coverage makes Q-carbon nanocomposite ideal for applications ranging from cutting tools to biomedical devices.
||Planned: Supplemental Proceedings volume