Commercially, Ta-7.5W alloy (FS-61) is commonly prepared by powder metallurgy process, which has a high strength at room temperature due to the high gap elements, such as the cold-drawn wire of the alloy (compression 83%) has a yield strength of about 1100MPa, and its applications include springs and other elastic parts in gas chlorinators. Ta10W is mainly used in the biomedical field, including bone replacement, bone defect filling, stent blood vessels, surgical sutures, tendon replacement, nerve fibers and so on. Tantalum alloys with tungsten mass fraction > 10% are generally tantalum alloys with high tungsten content.
Based on the analysis of mechanical properties data of Ta10W and Ta12W. With the increase of tungsten content, the high temperature strength of the alloy also increases, and the plasticity of the alloy decreases. Ta12W has higher creep strength and low creep rate, making it an excellent heat-resistant component material. By adjusting the proportion of tungsten content in the powder material, various strengthening effects are carried out on the whole alloy, which is conducive to further improving the mechanical properties of the alloy material such as high temperature strength and hardness.
The method for preparing tantalum-tungsten alloy powder comprises the following steps: providing tantalum-tungsten alloy ingots; The tantalum tungsten alloy ingot is smelted repeatedly for several times; Forging products of the previous step; The product of the previous step is hydrogenated and heat treated in a hydrogen atmosphere. The product of the previous step is broken mechanically to obtain coarse powder; From the coarse powder, the particle size range of aμm‑bμm powder is screened, a = 10 ~ 20, b = 50 ~ 60; The product of the previous step was dehydrogenated and heat treated under vacuum. Magnesium powder was added to the product of the previous step to carry out hypoxic heat treatment; The product of the previous step was treated by plasma spheroidization, and the sphericity of the powder reached more than 99%.
