Hardide~(TM)CVD Coatings resist wear, erosion and corrosion

摘要

Hardide~(TM) is a newly-developed family of CVD Tungsten Carbide coatings which increase life of critical parts operating in abrasive, erosive and chemically aggressive environments. Hardide-Tcoating has enhanced hardness of 1100-1600 Hv combined with excellent toughness, crack and impact resistance. The coating is typically 50 microns thick - exceptionally thick for CVD - and withstands 3000 microstrain deformations without any damage. This deformation will crack or chip most other thick, hard coatings. Hardide-T is up to 12 times more abrasion resistant than Hard Chrome, the erosion rate by Alumina in gas jet is half that of WC cladding. Hardide-A coating was developed as a replacement for Hard Chrome plating, it matches thickness and hardness of Hard Cr and outperforms Cr in corrosion protection and some mechanical properties. The gas-phase CVD process enables the uniform coating of internal surfaces and complex shapes such as valves and pump cylinders. Hardide is produced in a low-temperature CVD process at 500°C, this allows coating a wide range of metals, including all grades of stainless s-teel, most alloy steels, Ni-, Cu-, and Co-alloys, Titanium. Pore-free Hardide is resistant to acids and aggressive media, including H2S. The coatings are used in high-value industries where optimal part life plays an economic and/or performance critical role such as oil and gas exploration and production, aviation and general industrial pumps and valves.