The invention relates to a preparation method of high strength tantalum and tantalum alloy materials, in particular to a method of strengthening the microstructure of tantalum and tantalum alloy materials. It is characterized in that the surface of tantalum and tantalum alloy powders is oxygenated under the condition of low oxygen partial pressure, so as to form oxygen solid solution or low price tantalum oxygen compound with hard closed and thin shell structure on the powder surface. The treated tantalum powder was cured by hot isostatic pressing to obtain dense bulk materials. Finally, vacuum heat treatment is carried out to adjust the mechanical properties of the material. In the method of the invention, the tantalum or tantalum alloy powder is oxygenated on the surface to obtain the metal powder which is hard outside and tough inside, and then the powder is consolidated by hot isostatic pressing to obtain the dense block material strengthened by continuous cellular hard shell space network. The mechanical properties are adjusted through higher temperature heat treatment. The tantalum and tantalum alloy materials with this structure have no grain growth phenomenon at 2200℃, and can be used for high temperature structure.
Method for preparation of tantalum and tantalum alloy bars. It is characterized by the following steps: put prepared tantalum or tantalum alloy powder into a cylindrical rubber sheath, knead it into shape, seal it, place it in a cold isostatic press, press it into shape after pressure, pressure holding, pressure unloading, finish cold isostatic press molding, release the mold, and obtain the tantalum bar compaction; The round rod-shaped sintered billet was obtained by using vacuum indirect heating method, controlling the sintering temperature of 2100 ~ 2800℃ and holding for 3 ~ 20 hours. In the preparation method of the invention, the cylindrical rubber sheath is used for cold isostatic pressing, and the blank density is uniform and the strength is high. When the compacted material is sintered in a heating furnace, the compacted material is uniformly heated and the shrinkage deformation is consistent. The density of the sintered material is uniform and the internal quality of the product is improved, and the actual yield of tantalum rod is greatly increased without the need of cutting the product head.
Tantalum or tantalum alloy large size wire method, its character is: the first will be rolled into the diamond of tantalum and tantalum alloy billet using roller die drawing machine or rolling mill, it become the cleaning, washing, drying and middle prestressed after annealing treatment, using 1 ~ 10 mm pointing machine mould requirements rolled into the required size, then pointing of tantalum and tantalum alloy round bar after the introduction of wire drawing machine, after more than once Large size tantalum or tantalum alloy wire is obtained by continuous drawing. The invention makes use of drawing technology and welding technology to realize continuous, automatic, efficient and clean production of tantalum or tantalum alloy large-size wire rod. The finished wire material below Ф7.0mm can be produced through the invention, and the continuous drawing of large-size tantalum bar can be realized with high working efficiency, low labor intensity and improved working environment.
