Abstract: The invention relates to a ground element for mills, mixers and worms used preferably for the grinding/processing of paper stock and plastics materials comprising ceramic fillings, other fibrous substances such as crude brown coal, beet chip and the like. The ground elements have at least two fastening elements, which can have undercuts (44), beads and/or corners, on the fastening side (36) opposing the working surface (38) for fastening the ground element (41) in corresponding holes in a support body. Ground elements of this type can be arranged on the rotors of high-speed refiners. Rotors of this type have annular sectors which can be composed of a large number of individual ground elements. Differing tasks can, in this case, be assigned to the individual annular sectors. A central sector is formed from securely embedded metal carbides which have high thermal stability and which have emergency running properties if the ground discs are scraped.

Abstract: A method of laying a protective coating on a blade (1) made of a titanium alloy including vanadium. Vanadium powder is deposited on the portion of the blade (1) to be coated, the temperature of the powder is then raised to a temperature slightly greater than the melting point of vanadium. A powder of a cobalt-chromium-tungsten alloy is then deposited on the layer of vanadium, and this powder is raised to a temperature greater than its melting temperature and less than the melting temperature of vanadium. A blade made of an alloy of titanium including vanadium is characterized in that the blade includes a coating layer (5) of cobalt-chromium-tungsten alloy at its periphery, said layer being at least 1 mm thick and covering an underlayer of vanadium (6) which has a thickness lying in the range 0.5 mm to 1.5 mm. The resulting blade has very high resistance to abrasion by water droplets.