Commissariat a L'energie Atomique

Commissariat a L'energie Atomique Et Aux Energies Alternatives

Luc Federzoni

Pascal Revirand

Jean-Paul Garandet

Béatrice Drevet

Jacky Bancillon

Marc Pirot

Michel Bailleux

A solution for texturing silicon wafers configured to constitute photovoltaic (PV) cells. Silicon wafers can be produced, the surface of which include uniformly engraved patterns having a depth of between 5 and 50 &#x3bc;m.

Device and method for mechanically texturing a silicon wafer intended to comprise a photovoltaic cell, and resulting silicon wafer

The invention first relates to a feedstock for PIM, including a metal or ceramic powder; a polymeric binder; metallic or ceramic fibers or nanofibers, the fibers or nanofibers being metallic when the powder is metallic, and the fibers or nanofibers being ceramic when the powder is ceramic. It also relates to the method for producing such a feedstock, as well as the method for producing parts by means of powder injection molding (PIM) using said feedstock.

Method for producing ceramic or metal components by means of powder injection moulding, based on the use of inorganic fibres or nanofibres

A filling device, enabling simultaneous filling with at least two granular materials, without mixing them, includes an inner hopper supplying a first type of material and an outer hopper supplying a second type of material, and a dispenser arranged downstream from the hoppers. The dispenser includes a central passageway arranged directly opposite the inner hopper, and a deflecting mechanism towards the exterior of the dispenser arranged directly opposite the outer hopper. The deflecting mechanism at least partially borders the central passageway. The dispenser is capable of rotating about a longitudinal axis, the direction of which is the mean direction of flow, in which the dispenser includes a central shaft including an upper end opposite the inner hopper forming a deflecting surface for the first type of material coming from the inner hopper.

Filling device for at least two granular materials and filling method using such a device

A device for distributing granular materials in a recipient, particularly of complex shape intended to be arranged between a feed hopper and the recipient to be filled. The device includes a deflector, mobile in rotation around an axis, lining a passage linking the hopper to the recipient. The deflector is formed by at least one surface that may be inclined in relation to the axis of rotation approaching the axis in the direction of flow of the granules, or perpendicular to the axis. According to the speed of rotation, a certain quantity of granules is ejected by the deflector and another part passes directly in the passage.

Device for distribution of at least one granular product in a container filling device and method for filling using such a device

A device for filling a recipient with at least one material in a form of a powder, the device including: a filling channel configured to bring the material from a reserve of material to an entry opening of the recipient; and a pump that evacuates a pneumatic fluid contained in the recipient through at least one first evacuation duct and a second evacuation duct, wherein the at least one first evacuation duct is configured to connect an inside of the recipient to an environment outside of the recipient during a filling phase, the first evacuation duct being internal to the filling channel, and the second evacuation duct is configured to evacuate the pneumatic fluid before filling.

Device for filling a container with at least one type of powder material

A silicon wafer for a photovoltaic cell is produced by a debinding step of a self-supported film formed of at least one main thin layer comprising at least 50% volume of silicon particles, devoid of silicon oxide and encapsulated in a polymer matrix protecting them against oxidation, followed by a sintering step to form the silicon wafer.

Self-supported film and silicon wafer obtained by sintering

The invention relates to a method for preparing a feedstock for injection moulding or for extrusion, consisting of inorganic powders combined with an organic, particularly polymeric binder. This method is characterized in that the constituent particles of the inorganic powders are subjected to a granulation step, prior to their mixing with the polymeric binder.

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Bourgoin-Jallieu, France

Luc Federzoni