High-density nano W alloy with good self-passivation behavior and preparation method thereof

A nano-alloy technology, applied in the field of high-density nano-W alloy and its preparation, can solve the problems of easy growth, increase the heating rate, and reduce the sintering temperature

Inactive Publication Date: 2020-06-26
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By controlling the FAST process parameters (such as: reducing the sintering temperature, shortening the holding time, increasing the applied load and increasing the heating rate, etc.), the problem that the W alloy grains are easy to grow during the densification process is solved, so as to obtain high density and good performance. Nano-W alloys with self-passivation behavior

Method used

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  • High-density nano W alloy with good self-passivation behavior and preparation method thereof
  • High-density nano W alloy with good self-passivation behavior and preparation method thereof
  • High-density nano W alloy with good self-passivation behavior and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Under the protective Ar atmosphere, 96.36g of W powder with a purity of 99.5%, 12.54g of Cr powder with a purity of 99.5%, 0.66g of Y powder with a purity of 99.5% and 0.44g of Zr powder with a purity of 99.5% together with ball milling media Put them together into a 250ml WC ball mill jar, and then carry out alloying on a full-range planetary ball mill to obtain a ZW4 alloy powder with a homogeneous structure. The ZW4 alloy powder is filled in a graphite mold and densified by FAST technology. The FAST process parameters are: heating rate of 146°C / min, sintering temperature of 1000°C, external load of 50MPa, and no heat preservation.

[0027] figure 1 It is the microstructure picture of ZW4 alloy obtained under this process condition. Depend on figure 1 (a) It can be found that the W alloy contains a large number of pores. It shows that at lower sintering temperature, it is difficult for ZW4 alloy powder to be completely densified. Through the Archimedes method, it...

Embodiment 2

[0029] Under the protective Ar atmosphere, 96.36g of W powder with a purity of 99.5%, 12.54g of Cr powder with a purity of 99.5%, 0.66g of Y powder with a purity of 99.5% and 0.44g of Zr powder with a purity of 99.5% together with ball milling media Put them together into a 250ml WC ball mill jar, and then carry out alloying on a full-range planetary ball mill to obtain a ZW4 alloy powder with a homogeneous structure. The ZW4 alloy powder is filled in a graphite mold and densified by FAST technology. The FAST process parameters are as follows: the heating rate is 150°C / min, the sintering temperature is 1300°C, the applied load is 50MPa, and there is no heat preservation.

[0030] figure 2 It is the microstructure picture of ZW4 alloy obtained under this process condition. Depend on figure 2 (a) It can be found that the W alloy has a dense structure without obvious pores. It shows that at higher sintering temperature, the ZW4 alloy powder has been completely densified. T...

Embodiment 3

[0032] Under the protective atmosphere of Ar, 96.36g of W powder with a purity of 99.5%, 12.54g of Cr powder with a purity of 99.5%, 0.66g of Y powder with a purity of 99.5% and 0.44g of Zr powder with a purity of 99.5% together with ball milling media Put them together into a 250ml WC ball mill jar, and then carry out alloying on a full-range planetary ball mill to obtain a ZW4 alloy powder with a homogeneous structure. The ZW4 alloy powder is filled in a graphite mold and densified by FAST technology. The FAST process parameters are: heating rate of 146°C / min, sintering temperature of 1150°C, external load of 90MPa, and no heat preservation.

[0033] image 3 It is the microstructure picture of ZW4 alloy obtained under this process condition. Depend on image 3 (a) It can be found that the W alloy has a dense structure without obvious pores. Through the Archimedes method, its relative density was measured to be greater than 98.5%. image 3 (b) for image 3 Partial enla...

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Abstract

The invention discloses a high-density nano W alloy with good self-passivation behavior and a preparation method thereof. The nano W alloy is prepared from the components in percentage by weight: a basic component W, a passivation element Cr and activation elements Y and Zr, wherein Cr is greater than or equal to 10wt.% and less than or equal to 13wt.%, the total amount of the activation elementsis greater than 0wt.% and less than or equal to 2wt.%, and the balance is W. By controlling process parameters such as the sintering temperature and pressure, the heating rate and the heat preservation time during sintering, the high-density nano W alloy is obtained. The W alloy with the relative density being higher than 98.5% and the grain size being less than 100 nm is obtained under the conditions that the sintering temperature is 1150 DEG C and the applied load is 90 MPa. The nano W-alloy shows the good self-passivation behavior, and the oxidation weight gain of the nano W-alloy is only 7.8 mg/cm<2> after 165 h of heat-shock oxidation under the air atmosphere of 1000 DEG C.

Description

technical field [0001] The invention belongs to the field of superalloys applied under extreme conditions (high temperature and oxidation), and specifically relates to a high-density nano-W alloy with good self-passivation behavior and a preparation method thereof. Background technique [0002] Tungsten (W) has decisive advantages such as high melting point, high thermal conductivity, excellent anti-particle sputtering performance, and good high-temperature mechanical properties. It has broad application prospects in nuclear energy, electronic devices, military, aerospace and other engineering fields, especially applications under extreme high temperature conditions. However, W is very easy to oxidize at extremely high temperature, which will inevitably affect its application at high temperature. For example: when the first wall of nuclear fusion is oxidized at high temperature with W material, the W of the radionuclide will be oxidized and volatilized, so there is a risk o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C1/04
CPCC22C1/045C22C27/04
Inventor 谭晓月吴玉程王武杰陈昱溟罗来马朱晓勇
Owner HEFEI UNIV OF TECH
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