Superhard Coating Materials

3.04 Theory of Superhard Materials

Artem R. Oganov, Department of Geosciences, Center for Materials by Design, Institute for Advanced Computational Science, Stony Brook University, Stony Brook, NY, USA; Moscow Institute of Physics and Technology, Dolgoprudny city, Moscow Region, Russian Federation; Northwestern Polytechnical University, Xi’an, China Andriy O. Lyakhov and Qiang Zhu, Department of Geosciences, Stony Brook Universi...

Dynamic consolidation of superhard materials

Shock consolidation experiments were conducted via flyer impact on synthetic diamond (6-12 ^m) and cubic boron nitride (c-BN) (4-8 /im) admixed with SiC whisker (SCW), Si3N4 whisker (SNW), SiC powder, and Si powder contained in stainless steel capsules under the shock pressure range of 10-30 GPa. Scanning electron microscopy and transmission electron microscopy imaging of the samples revealed n...

New Superhard Ternary Borides in Composite Materials

Superhard substances are those a hardness above 20 GPa, i.e. higher than that of corundum (Kislii et al.,1988) or with a Vickers hardness Hv exceeding 40 GPa (Sologenko&Gregorianz, 2005). The ten utmost non-metal substances and refractory compounds form a "hardness pyramid" (Kislii et al.,1988) diamond being on top, followed by cubic-boron nitride and boron carbide. Metal-like ones form a simil...

The search for novel , superhard materials

The recent development in the field of superhard materials with Vickers hardness of >40 GPa is reviewed. Two basic approaches are outlined including the intrinsic superhard materials, such as diamond, cubic boron nitride, C3N4, carbonitrides, etc. and extrinsic, nanostructured materials for which superhardness is achieved by an appropriate design of their microstructure. The theoretically predi...

Coating Materials