We synthesized diamond–SiC nanocomposites with superhardness and greatly enhanced fracture toughness through a synthetic approach based on high-energy ball milling to form amorphous Si precursors followed by rapid reactive sintering at high pressure (P) and high temperature (T). We show how the simultaneous P–T application allows for better control of the reactive sintering of a nanocrystalline SiC matrix in which diamond crystals are embedded. The measured fracture toughness KIC of the synthesized composites has been enhanced greatly, as much as 50% from 8.2 to 12.0 MPa m1/2, as the crystal size of the SiC matrix decreases from 10 μm to 20 nm. Our result contradicts a commonly held belief of an inverse correlation between hardness and fracture toughness. We demonstrate the importance of nanostructure for the enhancement of mechanical properties of the composite materials.

/pdf/enhancement-of-fracture-toughness-in-nanostructured-diamond-2jsg4d4pg2.pdf

Enhancement of fracture toughness in nanostructured diamond-SiC composites

The thermodynamic properties and the phase diagram of the Fe-C system are reviewed by means of the CALPHAD method and Gibbs energy functions valid from 0 K upwards are presented. The Fe-C system ha ...

Thermodynamics of stable and metastable structures in Fe–C system

Mechanism, kinetics and modelling of the inverse-microsuspension homopolymerization of acrylamide

The chemical–physical environment around iron based FTS catalysts under working conditions is used to estimate the influences of carbon containing gases on the surface structures and stability of e-Fe2C, χ-Fe5C2, θ-Fe3C and Fe4C from combined density functional theory and atomistic–thermodynamic studies. Higher carbon content gas has higher carburization ability; while higher temperature and lower pressure as well as higher H2/CO ratio can suppress carburization ability. Under wide ranging gas environment, e-Fe2C, χ-Fe5C2 and θ-Fe3C have different morphologies, and the most stable non-stoichiometric termination changes from carbon-poor to carbon-rich (varying surface Fe/C ratio) upon the increase in ΔμC. The most stable surfaces of these carbides have similar surface bonding pattern, and their surface properties are related to some common phenomena of iron based catalysts. For these facets, χ-Fe5C2-(100)-2.25 is most favored for CO adsorption and CH4 formation, followed by θ-Fe3C-(010)-2.33, e-Fe2...

https://www.tandfonline.com/doi/pdf/10.1179/2055075814Y.0000000007

Determining surface structure and stability of ε-Fe2C, χ-Fe5C2, θ-Fe3C and Fe4C phases under carburization environment from combined DFT and atomistic thermodynamic studies

Structure and stability of Fe2C phases from density-functional theory calculations

Hexagonal Iron Carbide as an Intermediate in the Carbiding of Iron Fischer—Tropsch Catalysts1,2

Degassing Low-Boiling Liquids by Liquid-Phase Condensation

The Distribution of Liquid and Solid Fischer—Tropsch Hydrocarbons by Carbon Number*

Organic Reagents1 in Qualitative Analysis. III. The Analysis of the Common Metals of the Alkaline Earth Group and Magnesium Using 8-Hydroxyquinoline

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Hexagonal Iron Carbide as an Intermediate in the Carbiding of Iron Fischer—Tropsch Catalysts1,2

Degassing Low-Boiling Liquids by Liquid-Phase Condensation

The Distribution of Liquid and Solid Fischer—Tropsch Hydrocarbons by Carbon Number*

Organic Reagents1 in Qualitative Analysis. III. The Analysis of the Common Metals of the Alkaline Earth Group and Magnesium Using 8-Hydroxyquinoline