Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Centre National De La Recherche Scientifique

Commissariat a L'energie Atomique

Universitë De Bordeaux

Safran Ceramics

Patrick David

Arnaud Delehouze

Bruno P Bompard

Alexandre Allemand

Frédéric Schuster

Laurence Maille

Alain Ravenet

Pierre Delhaes

Frederic Schuster

Thierry Piquero

Maxime Zabiego

Amandine Lorriaux

Dominique Rovillain

Julien Martegoutte

Bruno Narcy

Jean D Benazet

Clémence Besnard

Pierre Broisson

Michel Trinquecoste

Alain Derre

Frédéric Malon

Jean Luc Bonnand

Denis Rochais

Jean-Luc Bonnand

A particulate composite ceramic material may include: particles of at least one first ultra-high-temperature ceramic 'UHTC,' the outer surface of the particles being at least partially covered by a porous layer made of at least one second UHTC in amorphous form; and the particles defining a space therebetween; optionally, porous clusters of the at least one second ultra-high-temperature ceramic in amorphous form, distributed in said space; a dense matrix and at least one third UHTC in crystallized form at least partially filling the space; optionally, a dense coating made of at least the third UHTC in crystallized form, covering the outer surface of the matrix, the matrix and the coating representing 5% to 90% by mass with respect to the total mass of the material. A part may include such a particulate ceramic composite material.

Particulate composite ceramic material, part comprising said material, and method for the preparation of said part

A process for manufacturing pyrocarbon, includes forming pyrocarbon by a calefaction process from at least one Cto Calcohol or polyalcohol precursor, the precursor being ethanol, rough laminar pyrocarbon being obtained by imposing a temperature of between 1250&#xb0; C. and 1325&#xb0; C. during calefaction.

Method for producing a pyrolytic carbon with predetermined microstructure

Method for the preparation, by means of a heating technique, of a composite material composed of a matrix of at least a first oxide of at least one metal and/or at least one metalloid reinforced by reinforcements in at least a second oxide of at least one metal and/or at least one metalloid, characterised in that the following successive steps are carried out: the reinforcements are placed in at least one liquid precursor of the first oxide of at least one metal and/or at least one metalloid; said reinforcements and the liquid precursor are heated so as to form the first oxide by means of the thermal decomposition of said liquid precursor, and to deposit the first oxide thus formed around the reinforcements and between the reinforcements thus forming the matrix.

Method for preparing composite materials with an oxide matrix and oxide reinforcements by means of a calefaction process

A new interface between the cladding and the stack of pellets in a nuclear control rod. According to the invention, an interface joint made of a material transparent to neutrons, in the form of a structure with a high thermal conductivity and open pores, adapted to deform by compression across its thickness, is inserted between the cladding and the stack of pellets made of BC neutron absorber material over at least the height of the stack. The invention also relates to associated production methods.

Solid interface joint with open pores for nuclear control rod

A tubular fibrous architecture is disclosed. According to one aspect, the tubular fibrous architecture includes a closed tubular part in at least one of its ends or bottom. The closed tubular part includes an architecture in which a textile material, such as a thread, roving, ribbon or bundle of threads, is continuously output from the bottom. Each textile material that is output from the bottom is continuously wound about the tubular part. All of the textile materials at the junction between the bottom and the remainder of the tubular part are continuous and there is a continuous geometric transition between the bottom architecture and the architecture of the remainder of the tubular part such that the textile materials in the tubular part cross over. A method of making such a tubular fibrous architecture is also disclosed.

Closed tubular fibrous architecture and manufacturing method

The invention relates to a film-boiling densification method for a porous structure (mixed gas-liquid method) () consisting in immersing of the porous structure into a liquid precursor, a hydrocarbon, for example, and heating the system in order to deposit the decomposition product of said liquid precursor, for example carbon, into the pores of the porous structure, characterized in that the flow of the liquid precursor entering the porous structure is reduced, for example by means of a filter () made of polytetrafluorethylene surrounding the structure so as to reduce the vaporization phenomenon of the liquid precursor around the porous structure to be densified.

Methods for calefaction densification of a porous structure

Process for the densification of a porous structure by boron nitride

Growing community of inventors

Saint Cyr sur Loire, France

Patrick David