Centre National De La Recherche Scientifique

Aerospatiale Societe Nationale Industrielle

Universite Claude Bernard – Lyon1

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Compagnie Europeene D'accumulateurs

Jean Bouix

Jean-Claude Viala

Christiane F Vincent

Henri Abiven

Henri J Vincent

Lionel Picquet

Gilles Claveyrolas

Jacques Dazord

Jean L Ponthenier

Jean C Viala

Roger Jp Lamartine

Dominique Micheaux

Gerard Dalibard

David Cornu

Francis Vocanson

Samuel Bernard

Herve Mourichoux

Lo&iuml;c Rousseau

Jean-Christophe Pasquet

Marie-Paule Berthet

Michel Macari

Christophe Colin

Philippe Miel&eacute;

B&eacute;rang&egrave;re Toury

Pascaline Toutois

M'hamed El Morabit

The object of the invention is new complexes of derivatives of thiacalix[4]arenes having the formula:R, R, R, R, R, R, Ret Rare such as defined in claim 1 and their utilization, especially for manufacturing of materials having optical limiter properties.

Metallic thiacalix[4]arene complexes

The invention concerns a method for making boron nitride fibers by drawing a polymer precursor and treating with ceramics the polymer fibers obtained by drawing. The invention is characterized in that the precursor polymer is obtained by thermal polymerization of a borazine of formula (I) wherein: R , R , R and R , identical or different, represent an alkyl, cycloalkyl or aryl group; and R represents a hydrogen atom or an alkyl, cycloalkyl or aryl group.

Method for making boron nitride fibers from aminoborazines

The invention relates to a composite material combining a magnesium alloy containing zirconium with a carbon reinforcement, as well as to its production process. According to the invention, such a composite material is prepared by the infiltration of a reinforcement formed from graphite or carbon fibres by a liquid magnesium alloy containing 0.3 to 1% by weight zirconium at a temperature of 650.degree. to 850.degree. C. Under these conditions, on said fibres is formed a zirconium carbide layer containing magnesium in solid solution and e.g. complying with the formula ZrC.sub.x Mg.sub.y with 0.3&lt;x&lt;1 and 0.02&lt;y&lt;0.12, which leads to the wetting of the fibres by the melted magnesium and to a good adhesion between the fibres and the matrix, without any deterioration to the mechanical characteristics of the fibres.

Process for producing composite material combining a magnesium alloy

The invention relates to a composite material comprising a matrix mainly constituted by an intermetallic compound of the AlNi type containing in solid solution 1.5 to 30 atom % silicon and a reinforcement formed from silicon carbide (SiC) particles dispersed in said matrix. In said material, the presence of silicon leads to a thermodynamic equilibrium system no longer evolving by SiC reinforcement/matrix chemical reaction when raised to a high temperature. This material can be prepared by conventional processes by adding the silicon to the starting material or by carrying out a limited reaction during the preparation between an AlNi matrix and the silicon carbide particles.

Composite material having an intermetallic matrix of AlNi reinforced by

According to the present invention, a composite material including a magnesium alloy containing zirconium with a graphite or carbon fiber reinforcement is provided. The material is prepared by infiltration of the reinforcement by a liquid magnesium alloy containing 0.3 to 1% by weight zirconium at a temperature of 650.degree. to 850.degree. C. Under these conditions, a zirconium carbide layer containing magnesium in solid solution is formed on the fibers. This results in wetting of the fibers by melted magnesium and good adhesion between the fibers and the matrix, without any deterioration in the mechanical characteristics of the fibers.

Reinforced composite material including a magnesium alloy matrix and

Improved device for continuously coating a carbon fiber fabric or similar with a carbide-based passivating protective layer, comprising:

Device for continuously coating a carbon fiber fabric with a

A process for continuously coating a strand of continuous carbon filaments by means of a refractory carbide by reactive technique which includes the step of causing the strand to travel under mechanical tension with a hermetic enclosure, simultaneously, introducing into the said enclosure a carbon free gas mixture consisting of hydrogen and of a volatile compound of an element capable of forming a refractory carbide; and heating the reaction mixture consisting of the strand and the gas mixture under controlled conditions so that the formation of the carbide deposit on the filaments takes place by a chemical reaction between the carbon in the filaments and the gas mixture. Under these controlled conditions, the reaction is self-regulated to produce a thin homogenous passivation coating on each filament.

Process for coating carbon fibers with a carbide

A process for continuously coating a strand of continuous carbon filaments by means of a refractory carbide by reactive CVD deposition, which includes the step of causing the strand to travel under mechanical tension with a hermetic enclosure, simultaneously, introducing into the said enclosure a gas mixture consisting of hydrogen and of a volatile compound of an element capable of forming a refractory carbide; and heating the reaction mixture consisting of the strand and the gas mixture so that the formation of the carbide deposit on the filaments takes place by a chemical reaction between the carbon in these filaments and the gas mixture; and the reaction is self-regulated by the diffusion of carbon through the layer of carbide already formed.

Process for coating carbon fibers with a carbide, and carbon fibers thus

A grid (10) for the plate of an electrical storage cell, eg. a lead-acid accumulator, comprises two orthogonal sets of conductive bars (7, 8) together with a current collector tab (9). The grid is made from a loosely-woven cloth comprising both bundles of conductive threads outlining the bars and the current collector of the plate, and bundles of non-conductive threads (6) serving to position said conductive threads relative to one another and to maintain them in position. Said bundles of conductive threads are embedded in a metal matrix comprising at least one of the metals in the group constituted by: lead, copper, cadmium, and nickel.

Fiber reinforced grid for a storage cell, and method of manufacturing it

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Lyons, France

Jean Bouix