High-entropy alloy and multi-component carbide eutectic composite material and its in-situ preparation method

A technology for high-entropy alloys and composite materials, applied in the field of high-entropy alloys and multi-element carbide eutectic composite materials and their in-situ preparation, to achieve good high-temperature creep resistance, diffusion promotion, and high diffusion rates

Active Publication Date: 2019-10-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the lack of comprehensive properties of the existing high-temperature-resistant high-entropy alloy at room temperature or high temperature and the deficiency of the solid-phase reaction method of the existing composite material, the present invention selects high-melting-point metal elements Mo, Nb, Re, and W on the basis of the high-temperature-resistant high-entropy alloy MoNbTaW , by adding high melting point TaC (including high melting point metal Ta), the high-entropy alloy and multi-component carbide eutectic composite material is formed in situ by arc melting method, and a high-temperature composite material with good room temperature strength and toughness is obtained

Method used

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  • High-entropy alloy and multi-component carbide eutectic composite material and its in-situ preparation method
  • High-entropy alloy and multi-component carbide eutectic composite material and its in-situ preparation method
  • High-entropy alloy and multi-component carbide eutectic composite material and its in-situ preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of MoNbW(TaC) 0.5 composite material. The specific steps are as follows:

[0029] (1) Mixing: Weigh 2.5935g of Mo powder, 2.5116g of Nb powder, 4.9750g of W powder, and 2.6080g of TaC powder with a purity of 99.95% (Mo / Nb / W / TaC molar ratio is 1:1:1:0.5 ), the particle size of the powder is 20 μm; use a light ball mill for 15 hours to mix evenly to obtain a mixed powder.

[0030] (2) Preparation of prefabricated block: put the mixed powder obtained in step 1 into a WC mold, and perform cold high-pressure molding (pressure 300 MPa) with a tablet press for 10 minutes to obtain a prefabricated block.

[0031] (3) Preparation of composite materials by electric arc melting: close the furnace door to vacuumize, and then pass 99.999% high-purity argon gas to make the pressure in the furnace relative to the standard atmospheric pressure reach -0.01MPa, start the arc quickly, and adjust the output power Melting to 40%-60% (current: 200-300A) for 2 minutes. After t...

Embodiment 2

[0034] Preparation of Re 0.5 MoNbW(TaC) 0.5 composite material. The specific steps are as follows:

[0035] (1) Weighing: Weigh 2.5140g of Re powder, 2.4638g of Mo powder, 2.6372g of Nb powder, 4.975g of W powder, and 2.6080g of TaC powder with a purity of 99.9% (Re / Mo / Nb / W / TaC molar ratio is 0.5:0.95:1.05:1:0.5). The particle size of the powder is 5 μm; it is mixed uniformly by using a light ball mill for 20 hours to obtain a mixed powder.

[0036] (2) Preparation of prefabricated block: put the mixed powder obtained in step 1 into a WC mould, and perform cold high-pressure molding (pressure 250 MPa) with a tablet press for 8 minutes to obtain a prefabricated block.

[0037] (3) Preparation of composite materials by electric arc melting: close the furnace door to vacuumize, and then pass 99.999% high-purity argon gas to make the pressure in the furnace relative to the standard atmospheric pressure reach -0.01MPa, start the arc quickly, and adjust the output power Melting...

Embodiment 3

[0040] Preparation of Re 0.5 MoNbW(TaC) 0.9 composite material. The specific steps are as follows:

[0041] (1) Mixing: take by weighing 2.5140g of Re powder, 2.5935g of Mo powder, 2.5116g of Nb powder, 4.9750g of W powder, 4.6943g of TaC powder (Re / Mo / Nb / W / TaC molar ratio is 0.5:1:1:1:0.9), the particle size of Re powder, Nb powder and TaC powder is 44 μm, and the particle size of other powders is 0.5 μm; use a light ball mill to mix evenly for 25 hours to obtain a mixed powder.

[0042] (2) Preparation of prefabricated block: put the mixed powder obtained in step 1 into a WC mould, and perform cold high-pressure molding (pressure 300 MPa) with a tablet press for 6 minutes to obtain a prefabricated block.

[0043] (3) Preparation of composite materials by electric arc melting: close the furnace door to vacuumize, and then pass 99.999% high-purity argon gas to make the pressure in the furnace relative to the standard atmospheric pressure reach -0.01MPa, start the arc quickl...

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Abstract

The invention provides a high-entropy alloy and multi-component carbide eutectic composite material and an in-situ preparation method thereof. Vacuum arc melting method is used to smelt Re, Mo, Nb, W pure metal powders and TaC powders at high temperature to form high-entropy alloy phases and multi-component carbide phases in situ to form eutectic composite materials. The composite material is composed of dendritic primary crystals and fine and regular lamellar eutectic structure, the phase interface is clean and the bonding strength is high; it shows good comprehensive properties of strength and toughness at room temperature, the yield strength is higher than 1.1GPa, and the average ultimate compressive strength is high. At 1.8GPa, the plastic strain at room temperature is higher than 5%, and the hardness is higher than 5.8GPa, which can be used in nuclear power technology, national defense and military industry and other fields.

Description

technical field [0001] The invention relates to a high-entropy alloy and multi-element carbide eutectic composite material and an in-situ preparation method thereof, belonging to the technical field of composite materials. Background technique [0002] With the continuous development of nuclear power technology, national defense and military industry and other fields, higher and higher requirements are put forward for high-temperature structural materials. For example, the operating temperature of the skin of aerospace vehicles is above 1000 °C, and the operating temperature of jet engines is as high as nearly 2000 °C. , High-temperature thermocouple elements use temperatures as high as 2300 ° C, etc., all require materials with higher use temperatures or higher high-temperature strength. High-temperature-resistant high-entropy alloy materials have a series of excellent properties, such as high strength, high hardness, and good high-temperature creep resistance under the com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C32/00C22C1/10C22C1/02
CPCC22C1/1036C22C30/00C22C32/0052C22C1/1047
Inventor 沈强魏琴琴罗国强刘茹霞张建王传彬张联盟
Owner WUHAN UNIV OF TECH
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