Customised repair services with repaired spray coatings as an example

Erosion wear in water turbines determines their maintenance intervals. An overhaul takes a lot of time and money, as the installation and removal of a turbine can take several months, depending on its model. The use of hard coatings extends service life, although there are always cases of partial damage to the coatings. Stellba and Empa have jointly developed and patented a method to partially repair these spray coatings made of tungsten carbide composite materials. These favourable results developed in laboratory tests have been confirmed by practical application in water turbines, and this method is being used successfully on the market.