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A multi-component composite strengthened molybdenum alloy and its preparation method

A multi-component composite and molybdenum alloy technology, which is applied in the field of powder metallurgy, can solve the problems of insufficient comprehensive performance and single performance of molybdenum alloy, and achieve the effects of improving high-temperature comprehensive performance, improving plasticity and processability, and low high-temperature creep rate

Active Publication Date: 2020-07-10
安泰天龙钨钼科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the shortcomings existing in the prior art, the object of the present invention is to provide a multi-component composite strengthened molybdenum alloy and its preparation method. The preparation method is to prepare a multi-component strengthened molybdenum alloy by adopting the method of powder metallurgy combined with forging and rolling deformation processing, which can not only realize the strengthening of trace second phase doping elements but also further strengthen the material performance through deformation processing, and solve the problem of molybdenum alloy in the prior art. The problem of single performance and insufficient comprehensive performance

Method used

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  • A multi-component composite strengthened molybdenum alloy and its preparation method
  • A multi-component composite strengthened molybdenum alloy and its preparation method
  • A multi-component composite strengthened molybdenum alloy and its preparation method

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Effect test

Embodiment 1

[0035] (1) Firstly weigh the raw materials according to the weight percentage of Mo-0.50Ti-0.10Zr-0.12C-1.0Hf-0.50Re, and then carry out the mixing treatment, wherein, the Fischer particle size of Mo and Re powders is 3.0 μm, TiH 2 , ZrH 2 , HfC, Mo 2 The particle size of powder C is -300 mesh; the raw materials are mixed in a three-dimensional vacuum mixer for 4 hours, and mixed evenly to obtain molybdenum alloy powder for later use.

[0036] (2) Put the molybdenum alloy powder prepared in the step (1) into the cavity of the mould, press and form it under the conditions of 150MPa and holding pressure for 5s, and obtain a formed billet.

[0037] (3) Place the formed blank obtained in step (2) in a high-temperature vacuum sintering furnace for sintering. The high-temperature sintering temperature is 2250° C., the holding time is 4 hours, and the vacuum degree throughout the sintering process is better than 5×10 -2 Pa, where the vacuum degree in the furnace before 1500°C is be...

Embodiment 2

[0042] (1) First, weigh the raw materials according to the weight percentage of Mo-0.45Ti-0.08Zr-0.10C-1.2Hf-1.0Re, and carry out the mixing treatment, wherein, the Fischer particle size of Mo and Re powder is 3.5 μm, and TiH 2 , ZrH 2 , HfC, Mo 2 The particle size of powder C is -200 mesh; the raw materials are mixed in a three-dimensional vacuum mixer for 6 hours, and mixed evenly to obtain molybdenum alloy powder for later use.

[0043] (2) Put the molybdenum alloy powder prepared in step (1) into the cavity of the mold, press and form under the conditions of 200MPa and holding pressure for 10s, and obtain a formed blank.

[0044] (3) Place the formed billet obtained in step (2) into a high-temperature vacuum sintering furnace for sintering. The high-temperature sintering temperature is 2200° C., the holding time is 5 hours, and the vacuum degree throughout the sintering process is better than 5×10 -2 Pa, where the vacuum degree in the furnace before 1500°C is better than...

Embodiment 3

[0050] (1) First, weigh the raw materials according to the weight percentage of Mo-0.40Ti-0.07Zr-0.08C-1.0Hf-1.0Re, wherein Re is added in the form of ammonium rhenate, the molybdenum powder Fisherman’s particle size is 4.0 μm, TiH 2 , ZrH 2 , HfC, Mo 2 C. The particle size of ammonium rhenate powder is -150 mesh; then, the mixed powder of molybdenum powder and ammonium rhenate is subjected to hydrogen reduction treatment, wherein the temperature of the first hydrogen reduction treatment is 450 ° C, and the time is 30 minutes. The temperature of the hydrogen reduction treatment is 900°C and the time is 30 minutes to obtain the molybdenum-rhenium alloy powder that meets the ratio requirements; finally, the molybdenum-rhenium alloy powder and other raw material powders are mixed in a double-motion vacuum mixer for 4 hours, and the molybdenum-rhenium alloy powder is mixed evenly to obtain molybdenum Alloy powder spare.

[0051] (2) Put the molybdenum alloy powder prepared in st...

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Abstract

The invention relates to a preparation method of a multi-element composite reinforced molybdenum alloy. The preparation method sequentially comprises the following steps that the Mo source, the Ti source, the Zr source, the C source, the Hf source and the Re source are weighed according to a certain weight ratio, the raw materials are prepared and mixed to obtain the uniform molybdenum alloy powder; the molybdenum alloy powder is placed in a mold cavity of a mold and is subjected to compression forming treatment to obtain a forming blank; high-temperature sintering treatment on the formed blank is carried out under vacuum to obtain a sintered blank; forging or rolling deformation processing is carried out on the sintered blank to obtain a forged blank or a rolled blank; and annealing heattreatment on the forged blank or the rolled blank is carried out to obtain the molybdenum alloy plate or a rod material. According to the preparation method, the steps and the process conditions are reasonable in design and good in using effect, the prepared molybdenum alloy material has excellent performance, the tensile strength Ra is greater than or equal to 200 MPa at a high temperature of 1600 DEG C, the percentage elongation after fracture is larger than or equal to 20%, and the oxygen content is less than or equal to 100 ppm.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and relates to a multi-component composite strengthened molybdenum alloy and a preparation method thereof. Background technique [0002] Molybdenum and molybdenum alloys are widely used in high temperature due to their high melting point, high high temperature strength, low high temperature creep rate, good thermal shock resistance, good thermal conductivity, low linear expansion coefficient and sputtering rate. Fuel cladding and core structure materials for liquid metal cooled reactors, emitter materials for thermionic reactor diodes, plasma-facing wall materials in nuclear fusion reactors, rotating anode materials for medical devices, aerospace high-temperature structural materials, engine nozzle materials Wait. With the continuous development of high-temperature applications such as aerospace, weapon electronics, nuclear power and medical treatment, the requirements for high-tempera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04B22F3/02B22F3/10B22F3/18B22F3/24B22F9/22C22C1/04
CPCB22F3/02B22F3/1007B22F3/1039B22F3/18B22F3/24B22F9/22B22F2003/248C22C1/045C22C27/04
Inventor 董帝刘国辉熊宁王承阳康聚磊
Owner 安泰天龙钨钼科技有限公司
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