Summary
To summarise, diffusion processes are used to make the surface wear resistant through formation of required element or elements enriched layer. Once the element is deposited on the surface by pack cementation or by vapor phase deposition or through other methods, the subsequent diffusion process shall depend on the diffusivity of the element, temperature, concentration gradient and the time of holding at the temperature. Hard surfaces formed by diffusion of interstitials like C, B or compound like VC resist abrasive and adhesive wear. The substitutional elements like Al and Cr form corrosion and oxidation resistant surfaces. Multi-component CVD coating of WC plus W has been developed to resist erosive wear in gas turbine blades. Multi-component diffusion coating of chromium and carbon has been used in cyclone separator to minimize erosive and corrosive wear. Diffusion coatings of chromium and aluminium in nimonic blades are used to minimize wear due to high temperature oxidation and corrosion in stationary gas turbine blades and vanes.
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(2004). Diffused and CVD Coatings of Single and Multiple Elements. In: Advanced Thermally Assisted Surface Engineering Processes. Springer, Boston, MA. https://doi.org/10.1007/1-4020-7764-5_17
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DOI: https://doi.org/10.1007/1-4020-7764-5_17
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