摘要:
A mould for moulding braking bands of composite material, with ventilation ducts, comprises a first half-mould (4) having a first impression surface (6) and a second half-mould (5) having a second impression surface (7). The half-moulds are movable towards each other and the two impression surfaces, together with suitable containment means, define a moulding cavity which has the shape of the braking band. The impression surfaces are intended to shape the friction surfaces of the braking band and the first half-mould comprises pin members (12), extensible and retractable, for forming the ventilation ducts with openings which open into the friction surfaces.
摘要:
From a general point of view, the present invention relates to a shaped composite material, particularly for braking applications, and to a method for its production. More particularly, the present invention relates to a composite ceramic material containing filaments constituted substantially by carbon, characterized in that it comprises a base layer and at least one surface layer on at least one of the faces of the base layer, and in that, in the surface layer, the filaments constituted substantially by carbon have a reactive contact surface large enough to enable a percentage of free carbon of less than (20)% by weight, preferably of between (5)% and (8)% by weight, calculated on the total weight of the at least one surface layer, to be obtained after a step of treatment with silicon.
摘要:
It is disclosed and induction furnace (1) comprising : a box-like housing structure (2, 6), which defines an internal chamber (3) of the induction furnace (1); an infiltration crucible (7) housed in the internal chamber (3) and comprising a first (10) and second (11) essentially mutually parallel and spaced away radiation plates, made of susceptor material, and an infiltration chamber (13), which is interposed between the radiation plates (10, 11) in order to be heated by the plates, the infiltration chamber being provided for housing a semifinished workpiece (14), to be subjected to infiltration, and infiltration material (15); at least an induction coil (L1, L2) housed in the internal chamber (3) to be supplied with at least an electrical current (i 1 , i 2 ) for induction heating of the radiation plates (10, 11). The induction coil (L1, L2) comprises a first (L1) and second (L2) spiral induction coil, each of the spiral coils (L1, L2) being positioned at a relatively shorter distance with respect to a respective associated radiation plate (10, 11) and at a relatively longer distance with respect to the other radiation plate (10, 11).
摘要:
A mould for moulding braking bands of composite material, with ventilation ducts, comprises a first half-mould (4) having a first impression surface (6) and a second half-mould (5) having a second impression surface (7). The half-moulds are movable towards each other and the two impression surfaces, together with suitable containment means, define a moulding cavity which has the shape of the braking band. The impression surfaces are intended to shape the friction surfaces of the braking band and the first half-mould comprises pin members (12), extensible and retractable, for forming the ventilation ducts with openings which open into the friction surfaces.
摘要:
A method for making a composite structure or a portion of a composite structure of a braking band of a brake disc, unusually capable of obtaining a structure with an especially long life, comprising at least the following steps: making a composite ceramic structure, comprising carbon fibre filaments, silicon and silicon carbides, obtaining a body of a braking band comprising at least one braking surface; processing said braking surface removing a surface layer so as to have carbon not bonded with the silicon on surface; removing at least partly the carbon not bonded with silicon from the surface; depositing an anchoring substrate on said braking surface; and depositing a protective coating on said anchoring substrate.
摘要:
A mould (4) for forming braking (5) of composite material having two rotor plates (6A, 6B) having a predetermined axis (X), separated by ventilation ducts (9) which extend from an outer edge (8) to an inner edge (7) of the braking band (5). The mould (4) comprises two half-shells (10, 12), inner (16) and outer (20) containment means designed to bound the inner edge (7) and the outer edge (8) respectively of the braking band (5), in such a way that the inner (16) an outer (20) containment means bound a forming cavity (24) with the two half-shells (10, 12). The inner containment means (16) comprise an inner side wall (28) from which shaping elements project perpendicular to the axis (X) and are bounded along the axis (X) by a first (38) and a second (40) axial extremity. In a configuration in which the mould (4) is closed, only one of the said axial extremities (38, 40) projects within the forming cavity (24).