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A kind of preparation method of high-purity mo-14re alloy tube billet

An alloy tube and high-purity technology is applied in the field of preparation of high-purity Mo-14Re alloy tube blanks, which can solve the problems of difficulty in preparing thin-walled long tubes, poor welding performance, and high content of interstitial impurity elements, avoiding head cracking, Increase structural performance and avoid the effect of inconsistent head and tail apertures

Active Publication Date: 2020-08-07
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both of the above two methods use the method of adding support rods to prepare pipes. Due to the limitation of processing methods, it is difficult to prepare thin-walled long pipes. Reactor devices generally use pipes with a length of 3000mm-6000mm and a wall thickness of 0.5mm-1mm. The above two methods are difficult to realize. In addition, these two methods use powder metallurgy sintering. Compared with vacuum smelting, the content of interstitial impurity elements is inevitably higher, so its welding performance is poor.

Method used

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  • A kind of preparation method of high-purity mo-14re alloy tube billet
  • A kind of preparation method of high-purity mo-14re alloy tube billet
  • A kind of preparation method of high-purity mo-14re alloy tube billet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment includes the following steps:

[0030] Step 1, 86.8 kg of molybdenum powder with an average Fisherley particle size of 2.5 μm and a purity greater than 99.95% and 13.2 kg of rhenium powder with an average Fisherley particle size of 2.0 μm and a purity greater than 99.95% are sequentially mixed and pressed to obtain a billet;

[0031] Step 2, put the billet obtained in step 1 into H2 with mass purity greater than 99.999% 2 In a high-temperature hydrogen sintering furnace, heat up to 900°C for 2 hours, then hold for 1 hour, then heat up to 1250°C for 2 hours, hold for 1 hour, heat up for 1.5 hours to 1500°C, hold for 1 hour, and heat for 2 hours to 1800°C, then hold for 1 hour After 1 hour, the temperature was raised to 2000°C for 2 hours, and then kept for 1 hour, and then the temperature was raised to 2225°C for 1 hour, and then held for 8 hours to obtain an electrode;

[0032] Step 3. The electrode obtained in step 2 is subjected to the first electron ...

Embodiment 2

[0051] This embodiment includes the following steps:

[0052] Step 1, 86.8 kg of molybdenum powder with an average Fisherley particle size of 1.5 μm and a purity greater than 99.95% and 13.2 kg of rhenium powder with an average Fisherley particle size of 3.0 μm and a purity greater than 99.95% are sequentially mixed and pressed to obtain a billet;

[0053] Step 2, put the billet obtained in step 1 into H2 with mass purity greater than 99.999% 2 In a high-temperature hydrogen sintering furnace, heat up to 900°C for 2 hours, then hold for 1 hour, then heat up to 1250°C for 2 hours, hold for 1 hour, heat up for 1.5 hours to 1500°C, hold for 1 hour, and heat for 2 hours to 1800°C, then hold for 1 hour After 1 hour, the temperature was raised to 2000°C for 2 hours and then kept for 1 hour, and then the temperature was raised to 2215°C for 1 hour and then kept for 8 hours to obtain the electrode;

[0054] Step 3. The electrode obtained in step 2 is subjected to the first electron b...

Embodiment 3

[0060] This embodiment includes the following steps:

[0061] Step 1, 43.4 kg of molybdenum powder with an average Fisherley particle size of 1.9 μm and a purity greater than 99.95% and 6.6 kg of rhenium powder with an average Fisherley particle size of 2.3 μm and a purity greater than 99.95% were sequentially mixed and pressed to obtain a billet;

[0062] Step 2, put the billet obtained in step 1 into H2 with mass purity greater than 99.999% 2 In a high-temperature hydrogen sintering furnace, heat up to 900°C for 2 hours, then hold for 1 hour, then heat up to 1250°C for 2 hours, hold for 1 hour, heat up for 1.5 hours to 1500°C, hold for 1 hour, and heat for 2 hours to 1800°C, then hold for 1 hour After 1 hour, the temperature was raised to 2000°C for 2 hours, and then kept for 1 hour, and then the temperature was raised to 2235°C for 1 hour, and then held for 8 hours to obtain an electrode;

[0063] Step 3. The electrode obtained in step 2 is subjected to the first electron ...

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Abstract

The invention discloses a preparation method for a high purity M0-14Re alloy tube blank. The method comprises the following steps that I, mixing molybdenum powder and rhenium powder, and then pressingthe mixtures into bar blanks; II, sintering the bar billets for obtaining electrodes; III, smelting the electrodes for obtaining ingots; IV, machining the ingots for obtaining tube billets; V, heating the tube billets and then extruding and straightening the tube billets in sequence; and VI, breaking off the straightened tube billets, turning an outer circle and an end face, and boring an inner hole in sequence, and obtaining the high purity M0-14Re alloy tube blank. According to the preparation method, through control over electron beam melting parameters, the defects of the ingots are avoided; through control over the proportion of the molybdenum powder to the rhenium powder, accurate control over the rhenium content in the high purity M0-14Re alloy tube blank is achieved, and the deformation resistance of the tube blank is reduced; and the finished product rate, surface quality and structural performance of the high purity M0-14Re alloy tube blank are improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of refractory alloy profiles, and in particular relates to a method for preparing high-purity Mo-14Re alloy tube blanks. Background technique [0002] Fast neutron reactor is the preferred reactor type of the fourth generation nuclear energy system, representing the development direction of the fourth generation nuclear energy system. The nuclear fuel in this kind of reactor is a closed cycle, which increases the utilization rate of uranium resources to more than 60%, and can also reduce the amount of nuclear waste to the greatest extent, and realize the minimization of radioactive waste. The structural material is mainly Mo-14Re alloy. New nuclear reactor designs in the United States and other countries plan to use Mo-14Re alloy as fuel element and cladding material. Mo-14Re alloy is also considered to be a new generation of controllable thermonuclear devices and The most potential converter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04C22C1/02C22B9/22B23P15/00
CPCB23P15/00C22B9/228C22C1/02C22C27/04
Inventor 李来平梁静林小辉高选乔杨毅超
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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