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

A w-ta-mo-nb-hf-c, high-entropy alloy technology, applied in the field of metal materials

Active Publication Date: 2021-08-20
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-hf-c high-temperature high-entropy alloy and its preparation method
  • A kind of w-ta-mo-nb-hf-c high-temperature high-entropy alloy and its preparation method
  • A kind of w-ta-mo-nb-hf-c high-temperature high-entropy alloy and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 Preparation of WTaMoNbHfC high temperature high entropy alloy

[0043] The raw materials used are W elemental powder, Ta elemental powder, Mo elemental particles, Nb elemental particles, HfC carbide powder, and W, Ta, Mo, Nb, Hf, and C elements are prepared in equal atomic ratios. 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: the vacuum chamber is evacuated to 5 × 10 -3 Pa, and then filled with 99.999% pure high-purity argon until the vacuum chamber pressure is -0.7MPa, high-purity argon is used as protective gas and arc 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 are repeatedly smelted 5 times, each smelting 4 minutes, the alloy is in the liquid state for 20 minutes, and the WTaMoNbHfC high-temperature high-entropy alloy ...

Embodiment 2

[0044] Example 2 Performance test and structural characterization of WTaMoNbHfC high-temperature high-entropy alloy ingot

[0045] 1. Density determination:

[0046] The Archimedes drainage method was used to measure, and the specific operation steps were as follows: The WTaMoNbHfC high-temperature high-entropy alloy prepared in Example 1 was prepared into three cylindrical samples of Φ4mm×4mm, and placed in a beaker filled with anhydrous alcohol before measurement. In the middle, ultrasonic vibration cleaning for 10min, take out and dry, and then use a DT-100 precision balance (accuracy 0.1mg) to weigh the dry weight of each sample M 1 , each sample is weighed 3 times to reduce the measurement error; then, the mass M of each sample in water is weighed again 2 , each sample is weighed 3 times; finally, the density is calculated according to the following formula,

[0047]

[0048] In the formula, ρ 0 is the density of water, 0.9982g / cm 3 (20°C); ρ l is air density, 0.0...

Embodiment 3W16

[0062] Example 3W 16 Ta 16 Mo 17 Nb 17 hf 17 C 17 Preparation, Performance Testing and Structural Characterization of High-Temperature High-Entropy Alloys

[0063] The raw materials used are W elemental powder, Ta elemental powder, Mo elemental particles, Nb elemental particles, HfC carbide powder, and according to W:Ta:Mo:Nb:Hf:C=16:16:17:17:17:17 Atomic ratio ingredients. 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: the vacuum chamber is evacuated to 5 × 10 -3 Pa, and then filled with 99.999% pure high-purity argon until the vacuum chamber pressure is -0.7MPa, high-purity argon is used as protective gas and arc 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 for 4 minutes, the alloy is in...

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Abstract

The invention provides a W-Ta-Mo-Nb-Hf-C high-temperature high-entropy alloy and a preparation method thereof. The high-temperature high-entropy alloy is composed of W, Ta, Mo, Nb, Hf and C in equal or non-equidomic ratios. The present invention also provides a preparation method of the high-temperature high-entropy alloy, comprising: 1) weighing W, Ta, Mo, Nb, Hf and C raw materials of required weight; 2) performing vacuum arc melting. The W-Ta-Mo-Nb-Hf-C high-temperature high-entropy alloy prepared by the present invention still has a strength of 266 MPa 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 high temperature structural field.

Description

technical field [0001] The invention belongs to the field of metal materials, relates to a high-temperature-resistant high-entropy alloy and a preparation method thereof, in particular to a W-Ta-Mo-Nb-Hf-C high-temperature high-entropy alloy and a preparation method thereof. Background technique [0002] Near-space hypersonic vehicles have many advantages such as high speed, high maneuverability, and long-range precision strikes, representing the development direction of aerospace vehicles. The exploration of new high-temperature structural materials resistant to extreme environments has become an urgent need for the development of hypersonic vehicles and aerospace technology. At present, ultra-high temperature environment materials generally use ultra-high temperature ceramics. However, the fracture toughness of the ultra-high temperature ceramic bulk material is low, and its thermal shock resistance is greatly affected by the size, which is the main reason restricting its...

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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