The preparation method of high density molybdenum tube belongs to the field of refractory metal material processing and preparation. The invention intends to solve the problems of high cost and low density of molybdenum tube in the existing molybdenum tube preparation technology. The method provided by the invention is: 1) after the molybdenum powder with purity > 3N and particle size of 1 ~ 10μm is formed by isostatic pressing at 160 ~ 220MPa, it is sintered at 1600 ~ 2000℃ in an intermediate frequency furnace for 1 ~ 8h under the condition of hydrogen protection to prepare ring molybdenum tube billet. 2) The density of molybdenum tube billet obtained in step 1) was improved by forging or extrusion at 700 ~ 1500℃ or combining forging and extrusion at 700 ~ 1500℃; 3) The high density molybdenum tube is annealed at 700 ~ 1200℃ for 1 ~ 5h to eliminate the stress, then machined, cleaned and dried to obtain high density molybdenum tube. The method has the advantages of low production cost, high purity and high density of the prepared molybdenum tube.
The invention belongs to the field of refractory metal material processing and preparation, in particular to the preparation method of high density molybdenum tube. Background Technology Molybdenum is a silver-white metal with melting point 2617"C and boiling point 4612. C, at room temperature with good stability and corrosion resistance, can be used in steelmaking industry, can improve the strength, hardness and corrosion resistance of steel; Molybdenum and its alloys have excellent high temperature strength, good electrical conductivity and thermal expansion properties, so they can be used as heat-resistant structural components in aerospace, rocket and nuclear industries, and are widely used in aerospace, electronics and glass manufacturing industries. As for the molybdenum tube materials, the current processing process is mostly made by machining solid molybdenum billet into holes, but this method has the following problems :(1) the waste debris of the lower corner material left in the processing process can not be recycled and reused, resulting in resource waste and increase the production cost of products; (2) The density of formed molybdenum tube is limited by the density of sintered billet, so it is difficult to continue to improve. The purpose of the invention is to solve the problems in the prior art and provide a method for preparing high-density molybdenum tubes. The method can not only increase the density of molybdenum tube, but also meet the application requirements of grain refinement and uniformity, low oxygen content (less than 200 PPM) and reduction of inherent defects, and can also reduce the production cost and be simple and easy to operate. The invention by molybdenum powder isostatic pressing molding, intermediate frequency furnace after high temperature sintering molybdenum tube billet is prepared, and is made of high temperature forging forming and high temperature, high temperature, high temperature extrusion forging combined extrusion molding, and three ways to increase density of molybdenum tube billet, after eliminating stress after annealing and mechanical engineering, cleaning, drying made high density molybdenum tube.
