A method for forming a contact piece for a circuit breaker, the contact piece comprising a reinforcement phase and a conductive phase, the method comprising: providing a slurry of the reinforcement phase in liquid; freeze casting the slurry, to form a cast comprising a frozen liquid structure and a reinforcement phase structure; removing the frozen liquid structure from the cast, to form a foam comprising the reinforcement phase structure; sintering the foam, to form a sintered foam; and infiltrating the sintered foam with the conductive phase, to form a piece part.

A composition for coating an electrical contact point includes a silver powder and a fluorinated resin. The silver powder is dispersed in the fluorinated resin, and a weight ratio of the silver powder for the fluorinated resin is in a range from 0.4 to 1.

The present invention relates to a new silver-based electrical contact material, in which silver is in a continuous phase and carbon being in a nano-dispersed phase is dispersed in continuous phase silver. The content of the dispersed phase carbon in the silver-based electrical contact material can be 0.02% to 5% by weight, on the basis of the total weight of the silver-based electrical contact material. According to the present invention, the carbon contains carbon in a diamond form. Such a silver-based electrical contact material shows excellent mechanical wear resistance and electrical performance.

A mechanism comprising a plurality of parts of which a first part comprises a first contact surface and a second part comprises a second contact surface arranged to move in relation to, and in contact with, the first contact surface. The first contact surface is provided by a multilayer coating directly on a surface of a metallic substrate of the first part. The multilayer coating comprises: a base layer arrangement arranged directly on the surface of the substrate; a composite layer arranged on top of the base layer arrangement, the composite layer consisting of particles of a Graphene and Related Materials (GRM) material in a metal matrix; and a metallic top layer arranged directly on top of the composite layer.