Dynamometer Rollers
A specially formulated steel and ceramic surface coating has been developed for dynamometer rollers used by garages. The scuffing action of the tyres causes rapid polishing of the roller surface, which reduces the efficiency of the equipment. To overcome this, Suntester Ltd, manufacturers of test equipment and dynamometers have perfected a surface coating, which provides a better gripping surface for the tyre. The process has been developed in association with Metallisation Ltd. The surface treatment takes the form of a sandwich coating on the rough-machined surface of the roller. Molybdenum is sprayed as a bond coating and on top of this S2. This is followed by alumina/ titania and a top coating of S2. The relative sizes of the ceramic and steel particles are such that the ceramic particles fill the gaps in the steel coating. The total effect is a honeycomb of steel packed with ceramic. Good adhesion to the roller surface in shear and resistance to polishing over a long period are specific advantages of this coating.
