Method of treating powder made from cerium oxide using an ion beam
AssigneeQuertech
InventorsDenis Busardo, Frederic Guernalec
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Abstract
A method of treating a powder (P) made from cerium oxide using an ion beam (F) in which: the powder is stirred once or a plurality of times; the ions of the ion beam are selected from the ions of the elements of the list consisting of helium (He), boron (B), carbon (C), nitrogen (N), oxygen (O), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) the acceleration voltage of the ions of the beam is between 10 kV and 1000 kV; the treatment temperature of the powder (P) is less than or equal to Tf/3; the ion dose per mass unit of powder to be treated is chosen from a range of between 1016 ions/g and 1022 ions/cm2 so as to lower the reduction temperature of the powder made from cerium oxide (P).
Claims12
A process for the treatment by an ion beam (F) of a powder based on cerium oxide (P), wherein:
- the powder is mixed one or more times during the treatment;
- the ions of the ion beam are selected from the ions of the elements of the list consisting of helium (He), boron (B), carbon (C), nitrogen (N), oxygen (O), neon (Ne), argon (Ar), krypton (Kr) and xenon (Xe);
- the acceleration voltage of the ions is greater than or equal to 10 kV and less than or equal to 1000 kV;
- the temperature of the powder (P) is less than or equal to Tm/3, where Tm is the melting point of said powder (P);
- the cumulative total dose of ions at the end of the treatment per unit of weight of powder to be treated is chosen within a range of between 1016 ions/gram of powder and 1022 ions/gram of powder (P) in order to reduce the temperature for reduction of the powder based on cerium oxide.
Dependencies are inferred from the claim text.