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A porous calcium silicate by the name of Promaxon®-D has been widely used in friction materials. Especially in NAO/non-steel (ceramic) disc pad applications, Promaxon®-D is an important ingredient of new generations of formulations. Except for its ability to increase porosity, the effect of Promaxon®-D on the friction performance was not well understood. This paper describes the effect of Promaxon®-D on the most relevant friction parameters of NAO/non-steel disc pad formulations. Promaxon®-D is a material which has been observed to be very effective at increasing the compressibility of friction materials. When added in the right percentage, Promaxon®-D can also be beneficial for parameters like friction level, fade resistance and recovery. This makes Promaxon®-D a versatile raw material for NAO/non-steel disc pad applications.

Friction materials for braking applications are made of a great number of components. Mineral Roxul®1000 fibres have been widely used as a reinforcement product for such materials. Especially in NAO/non-steel disc pad applications these fibres are an important component of the new generation formulations. In this paper, specific material formulations have been tested on an inertia braking tribometer. It is shown that the NVH performances may be strongly affected by the fibre type. Especially, a rubber coating on the surface of Roxul®1000 fibres reduces the squeal of NAO/non-steel disc pads significantly. Numerical simulations of the braking system have been also developed to better understand the effect of the material. Results show that the squealing modes are selected among instable modes corresponding to coupling between the pad-disc modal frequencies in frictional conditions.

Roxul®1000 fibres have been widely used as a reinforcement product for friction materials. Especially in NAO/non-steel disc pad applications Roxul®1000 fibres are an important component of the new generation formulations. Besides reinforcement properties, it was not well understood what the effect of Roxul®1000 fibres on the friction performance is. This paper describes the effect ELS Roxul®1000 fibres have on the most relevant friction parameters of NAO/non-steel disc pad formulations. It has been observed that ELS Roxul®1000 fibres do not only improve the crack resistance of NAO/non-steel disc pads, but also improve various friction parameters. When including up to 20 volume% Roxul®1000 fibres in a basic NAO/non-steel disc pad formulation both pad and rotor wear are reduced over a broad temperature range, speed and pressure sensitivity are reduced significantly, (first) fade performance is improved drastically and also brake noise is reduced over a broad range of driving conditions.