Abstract: The atomizer wheel is provided along the circumference of its external wall (3) with a number of ejection apertures, in which wear-resistant ceramic linings (7) are arranged by means of replaceable steel bushings (8). The steel bushings (8) and/or the linings (7) project somewhat into the annular chamber of the atomizer wheel and the bushings are sealed against the external wall (3) with sealing rings (11). Moreover, each bushing (8) is provided in its inner surface facing the associate lining (7) with a flat recess (13) extending on either side of the inner surface of the external wall (3). Thereby, the steel bushings (8) may be resiliently deformed without transferring excessive stresses to the linings (7).