The tantalum-tungsten binary alloy formed by adding a certain amount of tungsten element to tantalum has both the corrosion resistance of tantalum and the good high temperature strength of tungsten. This alloy has the advantages of high temperature resistance, high strength, good fracture toughness, corrosion resistance and so on. It has been widely used in aviation, aerospace, chemical industry, nuclear industry, high temperature technology and other fields. Due to the high deformation resistance of tantalum tungsten ingot, in order to prevent cracking in the forging process, the existing technology of tantalum tungsten alloy production is to warm forging tantalum tungsten ingot or even hot forging or extrusion at 1200℃ above, and then heat treatment and rolling. Using this method, a heating furnace is required. The surface of tantalum-tungsten alloy ingot will be oxidized after heating, and the oxide layer needs to be removed after processing, which increases the production cost and the process is complicated. The tantalum-tungsten alloy plate produced is not uniform in structure, with large grain size and poor mechanical properties.
In arc melting, the billet was put into the crucible of arc melting furnace to close the furnace door, and the vacuum was stopped when the pressure in the furnace was less than 0.003Pa, and then the vacuum was evacuated by filling high-purity argon to 0.05MPa. The above vacuuming steps were repeated three times before melting to obtain the tantalum tungsten alloy blank. For forging rolling, the tantalum-tungsten alloy blank obtained in S4 is successively forged and moulded to obtain plate-like rolling bars. Drawing processing, the strip obtained in S5 is drawn at high temperature, until the total deformation of the strip is greater than 70%, tantalum tungsten alloy wire is obtained, the tantalum tungsten alloy wire for continuous annealing treatment, obtained the required tantalum tungsten alloy wire.
Put the compressed billet into the crucible of arc melting furnace, close the furnace door, and pump the internal vacuum state, and make the internal pressure lower than 0.003Pa. Fill high-purity argon to 0.05MPa, then pump the vacuum, and heat to 2000℃-2400℃, and control the melting current at 400A ~ 500A for 3 ~ 5 minutes. Turn it over and proceed to the next smelting, three or four times. The obtained strip is drawn at the temperature of 700℃-850℃ until the total deformation of the strip is greater than 70%, and the Φ2-Φ5mm tantalum tungsten alloy wire is obtained.
