Wear parts and surfaces are used extensively in mechanical systems where there are moving parts and particularly where there are abrasive environments: the machine tools industry, injection mould tooling, automotive, aerospace, mining, drilling and construction.
The superior wear resistant surface is pure diamond and for large surfaces this can most readily be provided by the Chemical Vapour Diamond Deposition process. This is a relatively expensive process but many applications justify it and NDP has a number of associate companies that can work with the customer to develop the most cost effective solution.
For smaller wear areas, PolyCrystalline Diamond (PCD) inserts may be the most appropriate solution. With a diamond layer that can be up to 2.5 mm thick, giving exceptional wear resistance, and with the ability to cut, shape and locate in exactly the position required, PCD may be a preferred alternative to tungsten carbide or wear resistant coatings such as hard chrome in demanding wear environments. NDP market a range of PCD products specifically developed to provide cost effective wear protection: Synpak PCD.
Where temperatures are too high for PCD, which has a relatively low thermal limit, Thermally Stable Polycrystalline (TSP) may be used. TSP is a combination of silicon carbide and micron diamond, sintered together to form a solid bi-phase matrix. Like PCD, it is available in a wide range of sizes and shapes to suit each application. Unlike PCD, which usually has a tungsten carbide substrate, TSP has no substrate and it is often metal plated to allow brazing or welding processes to be used to locate it. NanoPak TSP is a unique offering from NDP for these applications. It has been specially formulated to give enhanced wear resistance to conventional TSP products and is particularly suitable for downhole applications.