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THE REACTION OF CERTAIN OXIDES AND CARBIDES WITH REFRACTORY METALS AT HIGH TEMPERATURES
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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Results are presented of an investigation of the contact reaction of BeO, MgO, ZrO2, and metal carbides Zr, Hf, Nb, and Ta with Nb, Mo, and WAT TEMPERATURES UP TO 2100 C. Oxides of chemically pure Be and Mg and ZrO2 stabilized with CaO, ZrC, HfC, NbC, and TaC of stoichiometric composition, and also industrially pure refractory metals were used. An oxide or carbide was pressed, after heating for 3 to 5 min on a hot forging press, onto a refractory metal sample. The products obtained were kept in a vacuum furnace with a graphite heater at temperatures from 1000 to 1600 to 2100 C for 0.5 to 5 hr. After extraction the ends were ground, polished, and examined metallographically. Tungsten had the greatest stability with BeO, Mo and W with Mgo, and Mo with stabilized ZrO2.
APPROVED FOR PUBLIC RELEASE