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Self-passivated tungsten alloy for enhancing high-temperature oxidation resistance through low-alloy elements and preparation method of self-passivated tungsten alloy

A high-temperature anti-oxidation and low-alloy technology, which is applied in the field of self-passivation tungsten alloys with low alloy elements to enhance high-temperature anti-oxidation performance and the field of preparation thereof, and can solve the problems of unfavorable high-temperature anti-oxidation performance, segregation of Cr elements, etc.

Pending Publication Date: 2020-05-12
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when W alloy is sintered below the solid solution temperature, it will inevitably lead to the segregation of Cr element, which is not conducive to improving its high temperature oxidation resistance.

Method used

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  • Self-passivated tungsten alloy for enhancing high-temperature oxidation resistance through low-alloy elements and preparation method of self-passivated tungsten alloy
  • Self-passivated tungsten alloy for enhancing high-temperature oxidation resistance through low-alloy elements and preparation method of self-passivated tungsten alloy
  • Self-passivated tungsten alloy for enhancing high-temperature oxidation resistance through low-alloy elements and preparation method of self-passivated tungsten alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Under the protective atmosphere of Ar, successively weigh 96.36g of W powder with a purity of 99.5%, 12.54g of Cr powder, 0.66g of Y powder and 0.44g of Zr powder, and put them into 250ml of WC powder together with WC balls according to the ball-to-material ratio of 5:1. In a ball milling pot, then ball milling is carried out on a planetary ball mill with a ball milling speed of 250 rad / min and a ball milling time of 80 hours to obtain homogeneous alloy powder. Then, the alloy powder is filled in the graphite mold and densified by FAST technology. Sintering process: heating rate is about 146°C / min, sintering temperature is 1150°C, pressure is 90MPa, no heat preservation.

[0028] figure 1 It is the microstructure diagram of the ZW4 alloy obtained under this process condition. It can be found that a large number of dark gray precipitates exist in the structure of the W alloy. Through the Archimedes drainage method, its relative density was measured to be higher than 9...

Embodiment 2

[0030] Under the protective atmosphere of Ar, successively weigh 96.14g of W powder, 12.54g of Cr powder, 0.66g of Y powder, 0.44g of Zr powder and 0.22g of Ti powder with a purity of 99.5% and weigh them together with WC balls according to the ball-to-material ratio of 5:1. Put it into a 250ml WC ball mill jar, and then perform ball milling on a planetary ball mill with a ball milling speed of 250 rad / min and a ball milling time of 80 hours to obtain homogeneous alloy powder. Then, the alloy powder is filled in the graphite mold and densified by FAST technology. Sintering process: heating rate is about 146°C / min, sintering temperature is 1150°C, pressure is 90MPa, no heat preservation.

[0031] figure 2 It is the microstructure diagram of the ZW5 alloy obtained under this process condition. It can be found that the size and number of segregation phases are significantly reduced after adding a small amount of Ti element to the ZW4 alloy. Through the Archimedes drainage met...

Embodiment 3

[0033] Under the Ar protective atmosphere, successively weigh 96.09g of W powder, 12.54g of Cr powder, 0.66g of Y powder, 0.44g of Zr powder, 0.22g of Ti powder and 0.055g of Si powder with a purity of 99.5%, according to the ball-to-material ratio of 5: 1 and WC balls are put into a 250ml WC ball mill jar, and then ball milled on a planetary ball mill with a ball milling speed of 250rad / min and a ball milling time of 80h to obtain homogeneous alloy powder. Then, the alloy powder is filled in the graphite mold and densified by FAST technology. Sintering process: heating rate is about 146°C / min, sintering temperature is 1150°C, pressure is 90MPa, no heat preservation.

[0034] image 3It is the microstructure diagram of the ZW6 alloy obtained under this process condition. It can be found that after adding a small amount of Ti and Si elements to the ZW6 alloy, only a small amount of segregation phase exists in the W alloy; from image 3 It can be seen that the grain size of t...

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Abstract

The invention discloses a self-passivated tungsten alloy (SPTA) for enhancing high-temperature oxidation resistance through low-alloy elements and a preparation method of the self-passivated tungstenalloy. The low-alloy elements are evenly dispersed into a W-Cr matrix through the mechanical alloying technology, then FAST is adopted for densifying powder, technological parameters in the sinteringprocess are controlled, and SPTA blocks with different components and of high-density, fine-grain and low-segregation / homogenous structures are obtained. Through thermal shock oxidation experiments, it is found that the high-temperature oxidization resistance of the SPTA can be obviously enhanced through the introduction of the low-alloy elements.

Description

technical field [0001] The invention belongs to the field of refractory tungsten (W) alloys used under extreme conditions (high temperature, oxidation), and specifically relates to a self-passivating tungsten alloy with low alloy elements to enhance high temperature oxidation resistance and a preparation method thereof. Elementally optimize the W alloy composition, and then prepare a self-passivating tungsten alloy with high density, fine grain, and a small amount of segregation / homogeneous structure by field-assisted sintering technology (FAST), in order to have good high-temperature oxidation resistance. Background technique [0002] Tungsten (W) has the advantages of high melting point (~3410°C), high thermal conductivity, low thermal expansion coefficient, good high-temperature mechanical properties, etc., and has broad application prospects in extreme environments. However, W is very easily oxidized in a high-temperature oxidizing atmosphere, which affects its applicati...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/04B22F9/04
CPCB22F9/04B22F2009/041C22C1/045C22C27/04
Inventor 谭晓月吴玉程王武杰吴眉罗来马朱晓勇
Owner HEFEI UNIV OF TECH
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