The preparation method of tantalum 2.5 tungsten alloy is characterized by the following steps :1) Tantalum powder and tungsten powder are prepared in a ratio of 9:1 and then mixed in a drum mixer for 24 hours at a rotating speed of 120r/min; 2) Sift the mixed powder through 120 mesh to obtain fine powder; 3) The fine powder is pressed into alloy bars with a 500-ton oil press; 4) Put the alloy bars into the vacuum sintering furnace, vacuum 10 2Pa, heat to 2400°C, hold for 2 hours, take out the coarse ingot; 5) Alloy ingot billet will be melted at least twice by vacuum electron beam furnace; 6) Put the alloy ingot billet into the high frequency furnace and heat it to 1400°C, then take it out and forge it several times to get the finished ingot billet.
2.5 In the process of tungsten alloy, the ingot billet is prepared by vacuum electron beam melting or vacuum arc melting for more than two times, then the billet is forged or extruded at a temperature above 1200°C, and the milk and drawing are carried out below 500°C. Finally, it can be made into plate, bar, wire, pipe and other products. But the ingot produced by this method has uneven structure, brittle billet and easy to fall off, so it is necessary to improve.
Tantalum powder and tungsten powder were prepared at a ratio of 9:1 and put into a drum mixer, which was mixed for 24 hours at a rotating speed of 120r/min. 2) Sift the mixed powder through 120 mesh to obtain fine powder; 3) The fine powder is pressed into alloy bars by a 500-ton oil press; 4) Put the alloy bars into the vacuum sintering furnace, vacuum 10 2Pa, heat to 2400°C, hold for 2 hours, take out the coarse ingot; 5) Alloy ingot billet will be melted at least twice by vacuum electron beam furnace; 6) Put the alloy ingot into the high frequency furnace, heat to 1400°C, take out and forge several times to get the finished ingot.
Compared with the prior art, the invention solves the problem of uneven structure of ingot billet and improves the problem of billet easy to fall off and brittle through full mixing and multiple melting of tantalum powder and tungsten powder.
