Process for generating an oxidic protective layer on a high-temperature material moulding
An oxidic protective layer on mouldings made of low-aluminium high-temperature material, which layer protects the base material against the attack of permeating hydrogen, is produced by the initial generation, especially by a brief immersion treatment in an Al bath and the removal of excess aluminiu...
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| creator | HEIMES,ENGELBERT STOEVER,DETLEV,DR |
| description | An oxidic protective layer on mouldings made of low-aluminium high-temperature material, which layer protects the base material against the attack of permeating hydrogen, is produced by the initial generation, especially by a brief immersion treatment in an Al bath and the removal of excess aluminium, of a thin aluminium-containing alloy layer in the metallically bright surface, which is then (a) heated in hydrogen for at least 10 hours at at least 900 DEG C and after cooling (b) is treated at < 700 DEG C for at least 5 to 10 hours in a mixture of steam-containing inert gas with a few vpm of oxygen and finally (c) is heated for at least a day at 900-950 DEG C in a mixture of steam-containing inert gas with hydrogen, having an H2:H2O ratio of approximately 1:1. i |
| format | Patent |
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| subjects | CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION |
| title | Process for generating an oxidic protective layer on a high-temperature material moulding |
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