Wear- and Corrosion-Resistance Materials

The CVD coating materials for wear and corrosion resistance consist mostly of carbides and nitrides and, to a lesser degree, borides. Table 17.1 compares the relative properties of these materials. 

Titanium Carbide. TiC, with its great hardness and wear resistance, is particularly suitable to reducing mechanical and abrasive wear. However, it is susceptible to chemical attack and is not a good diffusion barrier. 

Titanium Nitride. TiN is chemically stable. TiN forms an excellent diffusion barrier and has a low coefficient of friction. As such, it is well suited for reducing corrosion, erosion, and galling. It is used extensively as a coating for gear components and tube- and wire-drawing dies. 

Titanium Carbonitride. Ti(C,N) is a solid solution of TiC and TiN and combines the properties of both materials. It offers excellent protection against abrasive wear and has good lubricating characteristics. It is used to coat tools and dies for the processing of ceramics, graphite, and filled plastics. 

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Improved wear and corrosion-resistant materials for downstream use in gasification plants. 

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