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Method for manufacturing high performance sinter Mo-Ti-Zr molybdenum alloy

A technology of powder metallurgy and molybdenum alloy, which is applied in the field of powder metallurgy, can solve the problems of low toughness alloys, etc., and achieve the effects of improved tensile strength, simple process and high alloy performance

Inactive Publication Date: 2009-12-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, some researchers at home and abroad have studied the powder metallurgy preparation technology of TZM alloys. The strength range of the prepared TZM alloys is between 490 and 540MPa, and its strength needs to be improved. At the same time, the TZM alloys prepared by ordinary powder metallurgy methods have The defect of low toughness is still the bottleneck restricting the application of this alloy

Method used

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  • Method for manufacturing high performance sinter Mo-Ti-Zr molybdenum alloy
  • Method for manufacturing high performance sinter Mo-Ti-Zr molybdenum alloy

Examples

Experimental program
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example 1

[0018] (1) Taking the preparation of 300g alloy powder as an example, weigh the mass of each component of the alloy powder according to mass percentage:

[0019]

[0020] Stearic acid is heated and dissolved in alcohol and put into the ball mill tube together with the powder, and the ball mill tube is filled with N 2 Set the milling time to 5h to prepare the pre-alloyed powder. Take out the powder, dry it, and pack it in a bag for later use.

[0021] (2) Press the prepared pre-alloy powder into a shape.

[0022] (3) Pre-sintering the prepared compact in a vacuum atmosphere, the process is as follows: from room temperature to 380°C for 45 minutes, then to 1100°C for 150 minutes;

[0023] (4) The obtained pre-fired billet is subjected to high-temperature sintering with hydrogen passing, and the process is as follows: from room temperature to 1450°C for 100 minutes, and finally to 1950°C for 200 minutes;

[0024] (5) Keep the obtained sintered compact in an Ar atmosphere at 1200°C ...

example 2

[0027] (1) Taking the preparation of 300g alloy powder as an example, weigh the mass of each component of the alloy powder according to mass percentage:

[0028]

[0029] Stearic acid is heated and dissolved in alcohol and put into the ball mill tube together with the powder, and the ball mill tube is filled with N 2 Set the milling time to 15h to prepare the pre-alloyed powder. Take out the powder, dry it, and pack it in a bag for later use.

[0030] (2) Pressing the prepared pre-alloy powder into a shape.

[0031] (3) Pre-sintering the formed compacts with hydrogen. The process is as follows: from room temperature to 450°C for 30 minutes, then to 1050°C for 120 minutes

[0032] (4) The pre-fired billet is sintered at a high temperature in an ammonia decomposing atmosphere. The process is as follows: the temperature is raised from room temperature to 1400°C for 100 minutes, and finally to 1920°C for 200 minutes.

[0033] (5) Keep the sintered compact in a vacuum atmosphere at 1...

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Abstract

The invention relates to a method for preparing high-performance Mo-Ti-Zr(TZM) through utilizing powder metallurgy, which comprises the following steps: mechanically milling metal Mo powder, Ti(TiH2), Zr(ZrH2) powder and organic binder in a high energy ball mill, preparing pre-alloyed powder which is evenly mixed, pressing and forming mixed powder, presintering pressed compact in protective atmosphere, dehydrogenating, deoxidizing, wherein deoxidizing, controlling carbon and sintering in high temperature in high-temperature protective atmosphere, and finally, doing sintering later process for sintered compact. The mechanical property of TZM molybdenum alloy which is prepared by the method of the invention is better than that of alloy which is manufactured by a normal powder metallurgy process, wherein the highest tensile strength can reach570-600Mpa, and percentage of elongation reaches 19-25%.

Description

Technical field: [0001] The invention relates to the field of powder metallurgy, in particular to a method for preparing high-performance TZM (Mo-Ti-Zr) molybdenum alloy by adopting a powder metallurgy method. Background technique: [0002] TZM alloy is one of the more commonly used molybdenum-based alloys. Because of its high melting point, high strength, good electrical and thermal conductivity, strong corrosion resistance and good high-temperature mechanical properties, it is widely used in the processing of high-temperature structural materials. It has been widely used in high temperature fields such as aerospace and nuclear energy industry. At present, the alloying elements Ti, Zr and C are added to Mo to prepare TZM alloys using arc melting and powder metallurgy methods, among which arc melting is more common. However, this method is very complicated, especially the melting process. Due to the large difference in melting point of various elements, the segregation of element...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C27/04B22F3/12C22F1/18
Inventor 范景莲成会朝卢明园田家敏刘涛
Owner CENT SOUTH UNIV
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