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Protection du composite ni-co-tho//2 par procède d'imprégnation.

par Ghodsi, Mehdi ;Beatse, Teddy ;Detournay, P.
Référence ATB Metallurgie, 27, 4, page (155-158)
Publication Publié, 1987

Article révisé par les pairs

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Résumé :

The purpose of this work is to protect the using composite Ni-Co-ThO//2 (2 vol %) against high temperature oxidation, with chromium using a diffusion-type coating process. The samples were buried in a pack consisting of a powder blend of chromium (50 and 80 wt%), NH//4Cl(2 wt %) and, the balance, Al//2O//3. The NH//4Cl reaction with the chromium powder (forming the transfer agent CrCl//2 which is deposited on the surface of the material and is then reduced) was studied by thermogravimetry, X-ray diffraction, and by scanning electron microscopy.