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Network Covalent Solids

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

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Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles

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Solid solution cermet: (Ti,Nb)(CN)-Ni cermet.

Hanjung Kwon, Sun-A Jung

Journal of Nanoscience and Nanotechnology

|May 12, 2015

Summary

This summary is machine-generated.

Titanium niobium carbonitride (Ti,Nb)(CN) powders exhibit superior hardness in nickel-based cermets compared to titanium tungsten carbonitride (Ti,W)(CN). This enhanced hardness is attributed to the powder

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Area of Science:

Materials Science
Powder Metallurgy
Ceramics Engineering

Background:

Titanium carbonitride (TiCN) based cermets are widely used due to their excellent properties.
Tungsten carbide (WC) is a common additive, but its hexagonal structure differs from TiCN's B1 structure.
Niobium carbide/carbonitride (NbC/NbCN) also possesses a B1 structure, similar to TiCN.

Purpose of the Study:

To synthesize solid solution (Ti,Nb)(CN) powders.
To compare the properties of (Ti,Nb)(CN)-Ni and (Ti,W)(CN)-Ni cermets.
To investigate the factors contributing to hardness differences.

Main Methods:

High energy milling and carbothermal reduction in nitrogen were used for powder synthesis.
Phase formation and crystal structure were analyzed.
Hardness and density of the resulting cermets were evaluated.

Main Results:

Complete (Ti,Nb)(CN) phase formation was achieved over a broader Ti/Nb ratio range than for (Ti,W)(CN).
(Ti,Nb)(CN)-Ni cermets demonstrated higher hardness than (Ti,W)(CN)-Ni cermets.
Lower density of (Ti,Nb)(CN) powder led to a higher volumetric fraction in cermets, enhancing hardness.

Conclusions:

The B1 crystal structure compatibility facilitates broader phase formation for (Ti,Nb)(CN).
The higher hardness of (Ti,Nb)(CN)-Ni cermets is linked to increased volumetric content and potentially intrinsic material properties.
This study highlights (Ti,Nb)(CN) as a promising alternative to (Ti,W)(CN) for high-hardness applications.