Thermochemical treatment, in halogenated atmosphere, of a carbon-containing material

US6413585B1 · kind B1 · utility

Assignee

• Societe Nationale d'Etude et de Construction de Moteurs d'Aviation - S.N.E.C.M.A · FR

Inventors

• Yves Madec · Orléans, FR
• Lionel Vandenbulcke · Olivet, FR
• Christian Robin-Brosse · Le Haillan, FR
• Jacques Thebault · Bordeaux, FR
• Stephane Goujard · Moissy-Cramayel, FR

Key dates

• Filing date: Apr 21, 1999
• Grant date: Jul 2, 2002
• Expiry date: Apr 21, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B41/87
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention concerns (1) thermochemically treating by pack-cementation a carbon-containing material, which may have an open porosity, to generate a refractory carbide coating on its surface and, if the material is porous, within the material; and (2) the use of specific alloys as a pack for thermochemically treating carbon-containing materials, optionally with an open porosity, in a halogenated atmosphere. Pack-cementation is carried out under reduced pressure using an element E (to be transported and to be reacted with the carbon in the material to generate the expected carbide) alloyed to an element M, and using a halide (chloride or fluoride, preferably a fluoride) of the same element M, of low volatility, present in the solid form.