Burgmann Industries GmbH & Co. KG, Wolfratshausen/ Germany has introduced a revolutionary new diamond coating for mechanical seals, which offers excellent protection against wear during dry running, in applications with mixed friction and under exposure to abrasive media.
The specially developed crystalline diamond coating offers the same advantages as natural diamond and is suitable for applications in the oil and gas industries (e.g. multi-phase pumps), slurry applications, the chemical and pharmaceutical industries, and domestic applications (hot water). The diamond coating on the seal face has a thickness of up to 8 µm. It is extremely hard, exceptionally long wearing and features outstanding heat conductivity, excellent chemical resistance and low friction, with optimal adhesion to the substrate being a decisive feature in this respect.
EagleBurgmann’s DiamondFaces® is a microcrystalline coating which is applied to the seal face using a chemical vapor deposition (CVD) process. The fundamental difference is the horizontal arrangement of the tungsten wires (which reach temperatures of 2,000°C) in the vacuum oven; coatings up to 8 µm thick can thus be applied without affecting the flatness of the sealing faces, and this is vital for proper functioning of the mechanical seal. The crystalline diamond forms a chemical bond with the silicon carbide facing, and as a result the adhesion of the coating exceeds all known practical application requirements.
