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Preparation of Alloys.
U S Pat 3 925 068 1975 Dec; :
Alloys of tantalum, niobium, and vanadium are prepared by a process comprising (1) admixing Ta, Nb, or V nitride with an alloying metal, such as ni, CO, or fe, (2) compacting the admixture and, (3) heating the compact under vacuum at a temperature above the liquidus temperature of the desired alloy. For example, a compact containing 5 g of NbN and 13.8 G of Ni was prepared by admixing -220 mesh NbN and ni with 25 ml of a 1 pct solution of camphor in acetone in a rod mill for 10 min, followed by cold-pressing in a die at a pressure of 45,000 psi for a period of about 5 s. The compact was heated under vacuum in an Al2O3 crucible in a closed system at 1,300 deg c in a globar-heated furnace. The vacuum pump was rated at 33 l/min. After a period of 2 h, the system vacuum had dropped to under 30um Hg, at which time heating was stopped. The resulting alloy analyzed <0.003 pct N, 0.20 pct o and 78-80 pct Ni, with the balance being Nb.
U.S. Pat. 3,925,068, Dec. 9, 1975; Chem Abstr. Not Found
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