Improvement in the Method of the Surface Alloying of Refractory Metals in Aluminum Melts,
Abstract
Hot-dip calorizing of refractory metals, e.g. Ti, Nb and Mo, in aluminum melts is of special interest considering that the process is carried out at relatively low temperatures over a short period of time without requiring a special shielding atmosphere; the compounds of aluminum with refractory metals - the aluminides - display a marked high-temperature strength. Previously, however, the shortcomings of this process did not warrant its widespread industrial introduction. In this connection, the author describes a technique he employed to apply coatings of molten Al to small laboratory specimens of Ti, Nb and Mo. An intermediate container with the specimens is placed in the bath of molten aluminum for the necessary length of time, whereupon it is removed and transferred to a nearby furnace crucible so that the excess molten aluminum can be shed by gravity. With the aid of this method the effect of various factors such as the preparation of specimen surfaces, the alloying of the aluminum bath with such elements as Si or Be in order to reduce the oxidation of its surface, the melt temperature, etc. could be investigated. It was thus found that the formation of protective coatings of the molten metal on the solid metal involves such processes as wetting, adhesion and sorption.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 08, 1970
- Accession Number
- AD0714415
Entities
People
- P. F. Shulenok
Organizations
- National Air and Space Intelligence Center