Abstract: The aim of the present invention is a manufacturing process for assembly parts (101, 102, 111, 112) for the manufacture of elements of chemical devices (100), comprising the fixation of an anticorrosion metallic coating (31, 32) on an unprocessed assembly part (21, 22), by means of an operation comprising a brazing operation under a controlled atmosphere and, possibly, the shaping of the coated part (101, 102), by plastic deformation. The brazing temperature is preferentially less than approximately 750° C., and more preferentially between 600° C. and 720° C. The process according to the invention makes it possible to fix solidly on a steel plate an anticorrosion coating with a thickness less than 1 mm.

Abstract: The aim of the present invention is a process for manufacturing a plated product (1) comprising a support part in steel (2) and an anticorrosion metallic coating (3), characterized in that the anticorrosion coating (3) is fixed on the support part (2) by controlled-atmosphere brazing, in particular by vacuum brazing. The process according to the invention makes it possible to fix solidly an anticorrosion coating with a thickness smaller than 1 mm on a steel plate.

Abstract: The aim of the present invention is a process for manufacturing a plated product (1) comprising a support part in steel (2) and an anticorrosion metallic coating (3), characterized in that the anticorrosion coating (3) is fixed on the support part (2) by controlled-atmosphere brazing, in particular by vacuum brazing. The process according to the invention makes it possible to fix solidly an anticorrosion coating with a thickness smaller than 1 mm on a steel plate.

Abstract: The aim of the present invention is a process for manufacturing a plated product (1) comprising a support part in steel (2) and an anticorrosion metallic coating (3), characterized in that the anticorrosion coating (3) is fixed on the support part (2) by controlled-atmosphere brazing, in particular by vacuum brazing. The process according to the invention makes it possible to fix solidly an anticorrosion coating with a thickness smaller than 1 mm on a steel plate.

Abstract: A crucible holder made of a carbon material for use in crystal pulling operations and in the shape of a hollow receptacle. The holder includes at least two distinct and complementary parts that can be brought together by junction surfaces. When the parts are assembled to form the crucible holder, specific portions of the junction surfaces overlap to form at least one overlap area. The crucible holder can limit chemical reactions between the crucible and the holder and prolong the lives of both.

Abstract: A current collecting shoe for transferring energy from a catenary wire to rolling stock, includes a sheath constructed and arranged for fixing to a pantograph carried by the rolling stock, a wearing strip including graphite mounted on the sheath, a longitudinal slot or boring in the wearing strip and a tubular section disposed within the boring or at least partially within the slot. The tubular section is thermally stable at a temperature of at least 400.degree. C., and constructed of a material having a hardness of at least 4 on the Mohs scale and an electrical conductivity greater than graphite. This tubular section acts as an electrical conductor to transfer energy from the wearing strip to the rolling stock, and is constructed and arranged for sealing with a fluid therein and connection to a fluid pressure detection means.

Abstract: Active composite consisting of a compressed support and of at least one agent which is active towards a gas, the compressed support including recompressed expanded graphite which has a density of between 0.02 and 1.5. According to the invention the active composite is made up of a series of sheets superposed one above the other, the active agent being dispersed in the flakes.

Abstract: The invention relates to a rotating element of an electrical machine, rotating electrical contact parts and electrical machines containing these devices.

Abstract: A reactor for a chemical heat pump including a sealed container provided with a heating and cooling system and having an inside wall, and a solid reagent having an outer surface and disposed in the container, which solid reagent reacts reversibly with a reagent gas inside the container, the solid reagent having dimensions such that a space is defined between the outer surface of the solid reagent and the inside wall of the container. A fluid contact material occupies at least part of the space, the fluid contact material being a good conductor of heat and chemically inert relative to the solid reagent.

Abstract: The surface treatment of carbonaceous material (1) is characterised in that a layer of SiC (2) is formed on the carbonaceous material (1) by thermochemical conversion of the carbonaceous material (1) by a precursor of Si (4) at a temperature which is higher than the temperature for the formation, from said precursor, of a gaseous reactive intermediate (generally SiO), so as to obtain a surface layer (3) permitting an adherent diamond deposit (3).Pieces which are at least locally coated with `SiC/diamond`.

Abstract: The process comprising the charging into a mould (3) of at least one electrically conductive powder (4), the compression by means of a piston (5) of the contents of the mould to form a crude brush (7), the heat treatment of said crude brush (7) as well as the fixing of the ends of the electrical conductors (2), characterised in that the charging involves at least the simultaneous introduction of at least two conductive powders (4B, 4A and/or 4C . . . ) for obtaining a brush formed by integral blocks (1B, 1A and/or 1C . . . ), the junction (1AB and/or 1BC . . . ) between said blocks being orientated at least in part in the compression direction (13).

Abstract: A carbon-carbon composite material formed from a fibrous substrate and a matrix. The fibrous substrate has a carbon fiber base which acts as a reinforcement, a coarse texture and large sized cavities. The matrix includes pyrocarbon layers coating the fibrous substrate and a carbon based cellular structure dividing the large sized cavities of the substrate into small cavities having open porosity.

Abstract: A process for manufacturing carbonaceous parts including the steps of shaping a mixture of carbonaceous powder and bonding agent to form raw parts, cooling the raw parts to ambient temperature at a known rate and firing the cooled parts in a furnace from ambient temperature to a final firing temperature to release volatile particles to produce fired parts devoid of volatile products. This process is improved by placing the raw parts in an electric furnace in the absence of heating filler, heating the raw parts in the furnace to an intermediate temperature of about 200.degree. C. at a fixed initial heating rate such that the loss of volatile products is less than 10% by weight of the total amount of volatile products contained in the raw parts and being a function of the cooling rate such that the internal strain from the shaping and cooling step is freed.

Abstract: A composite carbon/polymer electrode for a rechargeable electrochemical lithium cell comprises a powder of carbonaceous material and a coating polymer rendered ionically conductive by the addition of a lithium salt, and possibly carbon black or carbon fibers. The carbonaceous material has a proportion of volatile matter between 5 and 22 wt %, and is preferably a raw coke or a semi-coke.

Abstract: A bellows for connecting hoses or apparatus operating in a partial vacuum including a corrugated tube reinforced on the outside by rings at the troughs of the corrugations. The tube further includes toric reinforcing rings on the inside of the crests of the corrugations, the length of the rings being adjustable so as to adapt to the deformation of the corrugations in service.

Abstract: Diffuser elements are provided to facilitate mass transfer in endothermic or exothermic solid/gas reactions between a reactive gas and a reactive composite material and are implanted in the reactive composite material to facilitate the diffusion of the reactive gas. These diffuser elements are profiles formed of porous carbonaceous material. The elements have a small loss of charge in a circulation direction of the reactive gas, and in a diffusion direction perpendicular to the circulation direction, these elements have a measured resistance to crushing of at least 1 MPa and permeability of at least 10.sup.-5 m.sup.3 /M.sup.2.s.Pa.

Abstract: The subject of the present invention is an electrode based on carbonaceous material for rechargeable electrochemical lithium generators. The carbonaceous material is a pitch coke with a mosaic texture subjected to a pre-lithiation treatment before the production of the electrode. The carbonaceous material is preferably a coal tar pitch coke with a mosaic texture. The specific reversible capacities are greater than 400 mAh/g.

Abstract: A magnetically drive centrifugal pump comprises a fixed assembly formed by a pump barrel made of a carbonaceous material, rigid annular bearings and a non-magnetic, non-electrically conductive sealing shell, and a rotating assembly formed by an impeller made of a carbonaceous material, a cylindrical rotor made of a carbonaceous material and having sealed therein permanent tracking magnets. The rotor is fixed directly to the impeller to form an impeller-rotor assembly which rests on the annular bearings. The driver includes magnets which interact with the permanent tracking magnets of the rotor in order to drive the pump, the driver being isolated from the impeller-rotor assembly by the sealing shell. The impeller-rotor assembly includes a secondary circuit for circulation of transported fluid located between the impeller-rotor assembly and the sealing shell.

Abstract: A process for producing a brush for an electric motor having predetermined final dimensions and including a wearing block and a connecting braid. The brush is produced by preparing at least one mixture including a conductive graphite powder in the form of solid particles of a mean thickness less than 25 .mu.m and a mean shape factor greater than 5, encased with a distillation binder. The mixture is molded together with the connecting braid in a mold to form a crude brush of the final dimensions and the crude brush is baked.

Abstract: The lining (1) includes by studs (2) mounted on a support (3), each being rigid with the support by reason of a mounting element and is characterized in thata) the mounting element (5) consists of a base (9) with a flange (13) with no axial symmetry,b) the support (3) consists of two metal plates, a rigid support plate (7) and a mounting plate (6) having orifices (10) in order to be able to grip the said flange (13) by reason of mechanical connections (8) between these two plates (6, 7),c) at least one of the plates (6, 7) displaying a deformation in such a way as to grip the flange and so achieve rotational locking of the stud (2).