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Zr-Ti-Nb alloy and preparation method thereof

A zr-ti-nb, alloy technology, applied in the field of powder metallurgy, can solve problems such as difficult to meet the requirements of space movable components, low strength of Zr alloy, composition segregation, etc., to avoid coarse structure, high density and uniform structure Effect

Inactive Publication Date: 2021-04-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
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Problems solved by technology

The main method of traditional preparation of Zr alloy is melting and casting method. The Zr alloy prepared by this method generally has low strength, and it is easy to cause composition segregation and high cost. The strength of the prepared Zr alloy is 800-1200MPa, and the space movable component The strength of the alloy material is required to be not less than 1400MPa, and the strength of the Zr alloy produced by the traditional melting and casting method is difficult to meet the requirements for the use of space movable components

Method used

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  • Zr-Ti-Nb alloy and preparation method thereof

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preparation example Construction

[0041] The present invention also provides a preparation method for the Zr-Ti-Nb alloy described in the above technical solution, comprising the following steps:

[0042] mixing Zr source powder, Ti source powder and Nb source powder to obtain mixed powder;

[0043] Compressing the mixed powder to obtain a molded green body;

[0044] In a protective atmosphere, sintering the shaped green body to obtain a sintered green body;

[0045] In a protective atmosphere, the sintered compact is subjected to hot isostatic pressing to obtain the Zr-Ti-Nb alloy.

[0046] The present invention mixes Zr source powder, Ti source powder and Nb source powder to obtain mixed powder.

[0047] In the present invention, the Zr source powder preferably includes Zr and ZrH 2 A mixture or Zr, when the Zr source powder preferably includes Zr and ZrH 2 A mixture of the Zr and ZrH 2 The mass ratio of is preferably 1:10 to 10:1. In the present invention, the particle size of the Zr source powder is ...

Embodiment 1

[0069] Weigh, Zr powder with a particle size of 10 μm, Ti powder with a particle size of 10 μm, and TiH with a particle size of 15 μm 2 Powder, Nb powder with a particle size of 10 μm, among which, Zr powder, Ti powder, TiH 2 The mass ratio of the powder to the Nb powder is 3:2:2:3. The above-mentioned powder is ball milled on a planetary ball mill, and the ball mill tank is evacuated by a vacuum pump. The vacuum time is 2min, and the ball mill speed is 200r / min. The time is 6h, the ball-to-material ratio is 3:1, the diameter of the grinding ball is 10mm, and the mixed powder is obtained;

[0070] The obtained mixed powder is pressed into shape by a cold isostatic pressing process, the pressure is 200MPa, and the pressure holding time is 30min to obtain a shaped green body;

[0071] The obtained molded body was sintered in a protective atmosphere. The sintering process was as follows: at a heating rate of 7 °C / min, the temperature was raised from room temperature to 500 °C, k...

Embodiment 2

[0075] Weigh Zr powder with a particle size of 10 μm, ZrH with a particle size of 15 μm 2 Powder, Ti powder with a particle size of 10 μm, Nb powder with a particle size of 20 μm, among which Zr powder, ZrH 2 The mass ratio of powder, Ti powder and Nb powder is 3:3:6:8. The above powder is ball milled on a planetary ball mill, and the ball mill tank is evacuated by a vacuum pump. The vacuum time is 2min, and the ball mill speed is 250r / min, the ball milling time is 3h, the ball-to-material ratio is 5:1, and the diameter of the ball is 10mm to obtain the mixed powder;

[0076] The obtained mixed powder is pressed into shape by cold isostatic pressing process, the pressure is 300MPa, and the holding time is 15min, to obtain the formed green body;

[0077] The obtained molded body was sintered in a protective atmosphere. The sintering process was as follows: at a heating rate of 8 °C / min, the temperature was raised from room temperature to 500 °C, kept for 1 h, and then at a he...

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Abstract

The invention provides a Zr-Ti-Nb alloy and a preparation method thereof, and belongs to the technical field of powder metallurgy. The Zr-Ti-Nb alloy provided by the invention comprises the following element components in percentage by mass: 20-40% of Zr, 10-60% of Ti and 20-50% of Nb. According to the invention, Zr, Ti and Nb can form an infinite solid solution through the solid solution effect in the sintering process, the strength of the alloy material is effectively improved, the solid solution effect can also enable the crystal form of the alloy to be converted into a body-centered cubic structure with strong deformability from a close-packed hexagonal structure, and the plasticity of the alloy material is effectively improved. Besides, the Nb element is added, so that the mixing entropy and the mixing enthalpy of the alloy can be influenced, the valence electron concentration of the alloy is changed, the phase composition of the alloy is influenced, the dislocation motion resistance of the alloy is improved, the processing hardening rate of the alloy is increased, and the purpose of improving the strength of the alloy is achieved.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a Zr-Ti-Nb alloy and a preparation method thereof. Background technique [0002] According to reports, the mechanical failure caused by the failure of structural parts is the main reason for the failure of my country's space vehicles. At present, the materials mainly used in space movable components are generally titanium alloys (such as: Ti6Al4V) and alloy steels (such as: 20CrMnTi, GCr15 and 20Cr, etc.). However, the above two types of materials have defects such as low strength or specific strength, large expansion coefficient, and low dimensional stability, which severely restrict the development of space mobile components in China. [0003] Zr alloys exhibit excellent performance in radiation resistance and corrosion resistance, and can be used as structural materials for space vehicles. The main method of traditional preparation of Zr alloy is meltin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C27/02C22C30/00C22C1/04B22F3/16
CPCB22F3/16C22C1/04C22C1/045C22C1/0458C22C14/00C22C27/02C22C30/00
Inventor 刘金旭司胜平刘兴伟李树奎吕延伟贺川冯新娅
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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