Method for preparing high-density molybdenum tube
A high-density, molybdenum tube technology, applied in the field of high-density molybdenum tube preparation, can solve the problems of the density limitation of the formed molybdenum tube, cannot be recycled and reused, and is difficult to continue to improve, and achieves reduced machining allowance, fewer defects, and increased density. Effect
Active Publication Date: 2009-12-09
安泰天龙钨钼科技有限公司 +1
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- Application Information
AI Technical Summary
Problems solved by technology
For the molybdenum tube material, the current processing process is mostly prepared by machining the solid molybdenum billet into holes, but this preparation method has the following problems: (1) the waste left in the processing process is currently still It cannot be recycled and reused, resulting in a waste of resources and an increase in the production cost of the product; (2) The density of the formed molybdenum tube is limited by the density of the sintered billet, and it is difficult to continue to increase
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0014] 1) Molybdenum powder (purity greater than 99.95%, particle size 2-3 μm) is loaded into a mold, subjected to 160Mpa isostatic pressing, and after demoulding, it is sintered in a hydrogen protective atmosphere at 2000°C for 1 hour in an intermediate frequency furnace to obtain a tubular sintered billet;
[0015] 2) Put the tubular sintered billet into the mold and use an air hammer to open the billet at 1420°C, and then carry out high-temperature free forging at 700°C, and the deformation amount reaches 40%;
[0016] 3) Then it is extruded at 700°C by an extruder, and then annealed at 1200°C for 1 hour after forming, followed by subsequent machining, cleaning, drying and other processes to produce a finished product. The molybdenum tube prepared by this method meets the process requirements: the outer diameter is Φ120mm, the inner diameter is Φ80mm, the tube length is 2000mm, and the density reaches 10.2g / cm 3 .
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Abstract
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 the molybdenum tube in the existing molybdenum tube preparation technology. The method provided by the present invention is through: 1) After isostatic pressing of molybdenum powder with a purity > 3N and a particle size of 1-10 μm at 160-220 MPa, sintering 1 ~8h, prepare a ring-shaped molybdenum tube blank; 2) adopt a combination of 700-1500 ℃ forging and 700-1500 ℃ extrusion to increase the density of the molybdenum tube blank obtained in step 1); 3) then place the high-density molybdenum tube blank in After annealing at 700-1200 ℃ for 1-5 hours to relieve stress, machining, cleaning and drying are performed to obtain high-density molybdenum tubes. The method of the invention has the advantages of low production cost, high purity and high density of the prepared molybdenum tube.
Description
technical field [0001] The invention belongs to the field of processing and preparation of refractory metal materials, and in particular relates to a method for preparing high-density molybdenum tubes. Background technique [0002] Molybdenum is a silver-white metal with a melting point of 2617°C and a boiling point of 4612°C. It has good stability and corrosion resistance at room temperature. It can be used in the steelmaking industry to improve the strength, hardness and corrosion resistance of steel; molybdenum and Its alloy has excellent high temperature strength, good electrical conductivity and thermal expansion properties, so it can be used as heat-resistant structural components in aerospace, rocket and nuclear industries, and has a wide range of uses in aerospace industry, electronics industry and glass manufacturing industry. For the molybdenum tube material, the current processing process is mostly prepared by machining the solid molybdenum billet into holes, but ...
Claims
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IPC IPC(8): B23P17/00B22F3/14B21J1/04B21C23/02
Inventor 胡延槽程咏梅
Owner 安泰天龙钨钼科技有限公司