دورية أكاديمية

Superior hardness and Young's modulus of low temperature nanocrystalline diamond coatings.

التفاصيل البيبلوغرافية
العنوان: Superior hardness and Young's modulus of low temperature nanocrystalline diamond coatings.
المؤلفون: Cicala, G.1 grazia.cicala@ba.imip.cnr.it, Magaletti, V.2, Senesi, G.S.1, Carbone, G.3, Altamura, D.4, Giannini, C.4, Bartali, R.5
المصدر: Materials Chemistry & Physics. Apr2014, Vol. 144 Issue 3, p505-511. 7p.
مصطلحات موضوعية: *DIAMONDS, *NANOCRYSTALS, *YOUNG'S modulus, *MATERIALS at low temperatures, *SURFACE coatings, *TEMPERATURE effect
مستخلص: Nanocrystalline diamond (NCD) coatings with thickness of about 3 μm were grown on silicon substrates at four deposition temperatures ranging from 653 to 884 °C in CH4/H2/Ar microwave plasmas. The morphology, structure, chemical composition and mechanical and surface properties were studied by means of Atomic Force Microscopy (AFM), X-Ray Diffraction (XRD), Raman spectroscopy, nanoindentation and Water Contact Angle (WCA) techniques. The different deposition temperatures used enabled to modulate the chemical, structural and mechanical NCD properties, in particular the grain size and the shape. The characterization measurements revealed a relatively smooth surface morphology with a variable grain size, which affected the incorporated hydrogen amount and the sp2 carbon content, and, as a consequence, the mechanical properties. Specifically, the hydrogen content decreased by increasing the grain size, whereas the sp2 carbon content increased. The highest values of hardness (121 ± 25 GPa) and elastic modulus (1036 ± 163 GPa) were achieved in NCD film grown at the lowest value of deposition temperature, which favored the formation of elongated nanocrystallites characterized by improved hydrophobic surface properties. [ABSTRACT FROM AUTHOR]
قاعدة البيانات: Academic Search Index
الوصف
تدمد:02540584
DOI:10.1016/j.matchemphys.2014.01.027