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A kind of w-ta-mo-nb-c high-temperature high-entropy alloy and its preparation method

A technology of w-ta-mo-nb-c, high-entropy alloy, applied in the field of W-Ta-Mo-Nb-C high-temperature high-entropy alloy and its preparation, to achieve the effect of stable crystal structure

Active Publication Date: 2021-07-09
NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially alloys with high strength at 1800°C have not been reported

Method used

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  • A kind of w-ta-mo-nb-c high-temperature high-entropy alloy and its preparation method
  • A kind of w-ta-mo-nb-c high-temperature high-entropy alloy and its preparation method
  • A kind of w-ta-mo-nb-c high-temperature high-entropy alloy and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Preparation of embodiment 1 WTaMoNbC high-temperature high-entropy alloy

[0044] The raw materials used are W elemental powder, TaC carbide powder, Mo elemental particles, and Nb elemental particles, and are formulated according to the atomic ratio of W, Ta, Mo, Nb, and C elements. Put the above raw materials into the water-cooled copper crucible of the non-consumable vacuum arc melting furnace, and then carry out vacuum arc melting: vacuumize the vacuum chamber to 5×

[0045] 10 -3 Pa, refill high-purity argon with a purity of 99.999% until the pressure of the vacuum chamber is -0.7MPa, high-purity argon is used as the protective gas and arcing medium, the melting current is 450A, and cooling water is passed during melting to prevent the water-cooled copper plate from overheating and melting , the front and back sides were repeatedly smelted 5 times, each smelting time was 4 minutes, and the alloy was in a liquid state for 20 minutes. After cooling, a WTaMoNbC high-t...

Embodiment 2

[0046] Performance test and structural characterization of embodiment 2 WTaMoNbC high-temperature high-entropy alloy ingot

[0047] 1. Density determination:

[0048] The Archimedes drainage method is used for measurement, and the specific operation steps are as follows: prepare the WTaMoNbC high-temperature high-entropy alloy prepared in Example 1 into three cylindrical samples of Φ4mm×4mm, and put them into a beaker filled with absolute alcohol before measurement , ultrasonically oscillate and clean for 10 minutes, take it out and blow dry, and then use a DT-100 precision balance (accuracy 0.1mg) to weigh the dry weight of each sample M 1 , weigh each sample 3 times to reduce the measurement error; then, weigh the mass M of each sample in water 2 , each sample was weighed 3 times; finally, the density was calculated according to the following formula,

[0049]

[0050] In the formula, ρ 0 is the density of water, 0.9982g / cm 3 (20°C); ρ l is air density, 0.0012g / cm 3...

Embodiment 3

[0064] Example 3W 20 Ta 20 Mo 21 Nb 19 C 20 Preparation, performance testing and structural characterization of high-temperature high-entropy alloys

[0065] The raw materials used are W elemental powder, TaC carbide powder, Mo elemental particles, and Nb elemental particles, and are formulated according to the atomic ratio of elements W:Ta:Mo:Nb:C=20:20:21:19:20. Put the above raw materials into the water-cooled copper crucible of the non-consumable vacuum arc melting furnace, and then carry out vacuum arc melting: vacuumize the vacuum chamber to 5×10 -3 Pa, refill high-purity argon with a purity of 99.999% until the pressure of the vacuum chamber is -0.7MPa, high-purity argon is used as a shielding gas and arcing medium, the melting current is 380A, and cooling water is passed during melting to prevent the water-cooled copper plate from overheating and melting , the front and back sides are repeatedly smelted 4 times, each smelting is 4 minutes, the alloy is in the liqu...

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Abstract

The invention provides a W-Ta-Mo-Nb-C high-temperature high-entropy alloy and a preparation method thereof. The high-temperature high-entropy alloy is composed of W, Ta, Mo, Nb and C in an equal or non-equal atomic ratio. The present invention also provides a preparation method of the high-temperature high-entropy alloy, comprising: 1) weighing required weights of W, Ta, Mo, Nb, and C raw materials; 2) performing vacuum arc melting. The W-Ta-Mo-Nb-C high-temperature high-entropy alloy prepared by the present invention still has a strength of 291MPa at 1800°C, which can be used to make up for the insufficient strength of the nickel-based superalloy at a temperature above 1200°C, and replace the nickel-based superalloy for the field of high-temperature structures .

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a high-temperature resistant high-entropy alloy and a preparation method thereof, in particular to a W-Ta-Mo-Nb-C high-temperature high-entropy alloy and a preparation method thereof. Background technique [0002] Aero-engines, aerospace vehicles, rocket engines and other high-temperature-resistant components often serve in high-temperature, high-pressure, high-corrosion environments, which not only have high requirements for metal structures, but also have strict requirements for high-temperature resistance, corrosion resistance, strength and toughness of materials . The currently used Ni (nickel)-based superalloy is limited by its melting point, and the service temperature does not exceed 1200 ° C, which is close to the service limit. There are inherent defects in the fracture toughness and fatigue resistance of high-temperature ceramic materials, which also limit the application ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02C22C1/03C22C32/00
CPCC22C1/02C22C1/03C22C30/00C22C32/0052
Inventor 梁秀兵万义兴张志彬胡振峰莫金勇沈宝龙
Owner NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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