摘要:
The invention concerns a method for depositing a coating of a first metal alloy on a fibre (10) extending in main direction D, comprising the following steps: (a) Providing a first mass (20) of a first metal alloy and heating the first mass (20) higher than the melting temperature of same so that said alloy is liquid and occupies space El, (b) Moving this fibre (10) from upstream to downstream through the first liquid mass (20) in the direction in which the fibre (10) extends at first speed VI such that the fibre (10) is covered, on at least one portion of the length of same, with a coating (25) of the first alloy of a non-zero thickness over the entire periphery of same in a plane perpendicular to main direction D. Before step (a), the following steps are carried out: (i) Providing a second mass (220) of a second metal alloy of which melting temperature TF2 is strictly higher than melting temperature TF1 of the first alloy, (j) Heating the second mass (220) higher than the melting temperature of same so that said second alloy is in the liquid state and occupies space E2, then moving the fibre (10) from upstream to downstream through the second alloy, this movement being carried out at second speed V2 which is such that the coating speed of the second alloy during this movement is in the visco-capillary range, such that the fibre (10) is covered on this portion of the length of same with a coating (225) of the second alloy of a non-zero thickness over the entire periphery of same, (k) Cooling this coating (225) until it becomes solid.
摘要:
This process for manufacturing a cutting wire formed of abrasive particles held on a central core by a binder, comprises: a) the deposition (204) of abrasive particles on the central core, each abrasive particle comprising a magnetic material, the relative permeability of which is greater than 50, this magnetic material representing at least 1% of the volume of the abrasive particle, and b) the deposition (204, 208) of the binder on the central core in order to keep the abrasive particles attached to this central core. During step a), a magnetic interaction is created (202, 206) between the central core and the magnetized abrasive particles in order to attract the magnetized particles to the central core and, before step a), the central core has, at its surface, at least two south poles and two north poles distributed alternatively along its periphery and/or along its length.
摘要:
The invention relates to a device for the metal coating of fibres, for example ceramic fibres, by a liquid process, said device comprising a crucible (2) containing a liquid metal bath (3) through which a fibre (1) is drawn in order to be coated with said metal, said device also comprising a cooling system (11) positioned downstream from said metal bath in order to solidify the metal sheath created around said fibre by capillarity, characterised in that said cooling system comprises at least one nozzle for ejecting a compressed gas towards the coated thread (le), and in that the system is sized such as to solidify the metal on the periphery of the coated thread (le) over a length of no more than 200 mm.
摘要:
The invention relates to a method for the liquid metal coating of fibers made of a ceramic material, consisting of maintaining a metal load (22) having a spherical shape in a molten state and in levitation within a crucible (12), and running, at a predetermined speed, a stretched fiber made of a ceramic material between an upper pulley (26) and a lower pulley (28) arranged on either side of the crucible such that a portion (35) of the fiber is submerged in the load so as to be covered by a metal coating. During the coating, the portion of the fiber that is submerged in the load is moved based on the remaining volume of the load such that the instantaneous height (h) of the fiber that is submerged in the load remains substantially constant during the entire coating. The invention also relates to a device for implementing said method.