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A kind of nanocomposite oxide dispersion strengthened molybdenum alloy and preparation method thereof

A composite oxide and dispersion strengthening technology, applied in the direction of reducing greenhouse gases, nuclear power generation, climate sustainability, etc., can solve the problems of large oxide size, grain boundary segregation of oxygen elements, etc., to improve oxygen content, increase strength, Effect of improving high temperature mechanical properties

Active Publication Date: 2022-07-12
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a nanocomposite oxide dispersion-strengthened molybdenum alloy and its preparation method to solve the problem of large oxide size and oxygen in the preparation of existing oxide dispersion-strengthened molybdenum alloys. Technical problems of segregation of elements at grain boundaries

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  • A kind of nanocomposite oxide dispersion strengthened molybdenum alloy and preparation method thereof

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Effect test

Embodiment 1

[0026] The nanocomposite oxide dispersion-strengthened molybdenum alloy of this embodiment has a composition ratio of 1% Y in terms of mass fraction. 2 O 3 , 0.6% Zr, the remainder is molybdenum and inevitable impurities.

[0027] The preparation method of the nanocomposite oxide dispersion-strengthened molybdenum alloy of the present embodiment is:

[0028] 1) Molybdenum metal element powder, Y 2 O 3 Powder and Mo 2 Zr alloy element powder, weighed according to the composition ratio, and then put into a 250mL zirconia ball mill jar together with a 10mm diameter grinding ball, and the material-to-ball ratio is 1:10. Perform powder mixing and encapsulation.

[0029] 2) In a high-purity argon atmosphere, the mixed powder was ball-milled at a speed of 300 rad / min for 30 hours. In order to avoid powder agglomeration caused by overheating, every 2 hours of operation, the machine was stopped for 1 hour and reversed once. 2 O 3 Solid solution with Zr in molybdenum matrix to pr...

Embodiment 2

[0033] The nanocomposite oxide dispersion-strengthened molybdenum alloy of this embodiment has a composition ratio of 2% Y in terms of mass fraction. 2 O 3 , 0.6% Zr, the remainder is molybdenum and inevitable impurities.

[0034] The preparation method of the nanocomposite oxide dispersion-strengthened molybdenum alloy of the present embodiment is:

[0035] 1) Molybdenum metal element powder, Y 2 O 3 Powder and Mo 2 Zr alloy element powder, weighed according to the composition ratio, and then put into a 250mL zirconia ball mill jar together with a 10mm diameter grinding ball, and the material-to-ball ratio is 1:10. Perform powder mixing and encapsulation.

[0036]2) In a high-purity argon atmosphere, the mixed powder was ball-milled at a speed of 200 rad / min for 48 hours. In order to avoid powder agglomeration caused by overheating, every 2 hours of operation, the machine was stopped for 1 hour and reversed once, and circulated in turn. Y is processed by high energy bal...

Embodiment 3

[0040] The nanocomposite oxide dispersion-strengthened molybdenum alloy of this embodiment has a composition ratio of 1% Y in terms of mass fraction. 2 O 3 , 1.2% Zr, the remainder is molybdenum and inevitable impurities.

[0041] The preparation method of the nanocomposite oxide dispersion-strengthened molybdenum alloy of the present embodiment is:

[0042] 1) Molybdenum metal element powder, Y 2 O 3 Powder and Mo 2 Zr alloy element powder, weighed according to the composition ratio, and then put into a 250mL zirconia ball mill jar together with a 10mm diameter grinding ball, and the material-to-ball ratio is 1:10. Perform powder mixing and encapsulation.

[0043] 2) In a high-purity argon atmosphere, the mixed powder was ball-milled at a speed of 400 rad / min for 12 hours. In order to avoid powder agglomeration caused by overheating, every 2 hours of operation, the machine was stopped for 1 hour and reversed once, and circulated in turn. Y is processed by high energy ba...

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Abstract

The invention discloses a nano-composite oxide dispersion-strengthened molybdenum alloy and a preparation method thereof, belonging to the field of refractory metal matrix composite materials. With molybdenum metal element powder, Y 2 O 3 Powder and Mo 2 Zr alloy element powder is used as raw material, the alloy components are uniformly mixed and packaged in proportion, and the Y 2 O 3 It is solid-dissolved with Zr in a molybdenum matrix to prepare a composite powder, and then the powder is solidified by spark plasma sintering, and the nano Zr-Y-O composite oxide is precipitated to prepare a nano-composite oxide dispersion-strengthened molybdenum alloy. The present invention utilizes Y 2 O 3 The solid solution and reprecipitation mechanism of the molybdenum is formed by adding Zr element, Y element and free oxygen to form a Zr-Y-O composite oxide with a fluorite structure. While removing the free oxygen in the molybdenum matrix, the oxide particles are refined to 5 ~30nm; and the oxide particles precipitated in situ have a coherent / semi-coherent relationship with the molybdenum matrix, and most of them are distributed in the grains, which play a role in precipitation strengthening, which can significantly improve the mechanical properties and radiation resistance.

Description

technical field [0001] The invention belongs to the field of refractory metal matrix composite materials, in particular to a preparation method of a nano-composite oxide dispersion-strengthened (Oxide Dispersion-Strengthened, ODS) molybdenum alloy. Background technique [0002] Molybdenum and its alloys have high melting point, low expansion coefficient, excellent high temperature mechanical properties and outstanding radiation resistance, and are widely used as high temperature structural materials, such as electrodes for melting glass, rocket nozzles, and nuclear reactor fuel cladding. However, its room temperature brittleness, recrystallization brittleness, low high temperature strength and irradiation-induced embrittlement seriously affect its processing and service performance. In order to improve its mechanical properties, solute elements, carbides or oxides are usually introduced to disperse and strengthen molybdenum grains and grain boundaries. Among them, oxide dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04C22C32/00C22C1/05B22F3/105B22F9/04
CPCC22C27/04C22C32/0031C22C1/05B22F3/105B22F9/04B22F2003/1051B22F2009/043B22F2009/041Y02E30/30
Inventor 高义民姚丽莹黄一杰李烨飞黄孝余王怡然
Owner XI AN JIAOTONG UNIV
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