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Preparation method of refractory high-entropy alloy powder

A high-entropy alloy and refractory technology, which is applied in the field of preparation of refractory high-entropy alloy powder, can solve the problems of low efficiency and long preparation cycle, and achieve the effects of low cost, avoiding long time and high cost

Inactive Publication Date: 2018-11-27
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mechanical alloying is another common preparation process for refractory high-entropy alloy powders, but the preparation cycle of this method is long, generally more than 50 hours, so the efficiency is low

Method used

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  • Preparation method of refractory high-entropy alloy powder
  • Preparation method of refractory high-entropy alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A refractory high-entropy alloy powder is composed of four high-melting refractory metals, niobium, molybdenum, tantalum and tungsten. The atomic percentage of each component is 25%, and the material is expressed as Nb 25 Mo 25 Ta 25 W 25 . The alloy powder preparation steps are as follows:

[0019] (1) Weigh four refractory metal powders of niobium, molybdenum, tantalum and tungsten according to atomic percentage. The particle size of the four powders is all less than 0.010mm, and the purity is greater than 99.5%.

[0020] (2) Ball mill and mix the proportioned powder in a high-energy ball mill for 1 hour. The ball to material ratio is 4:1.

[0021] (3) Put the mixed powder in a graphite mold, and perform pressureless sintering in a spark plasma sintering furnace. The protective atmosphere is argon, the sintering process parameters are: vacuum degree 5Pa, sintering temperature 1680°C, holding time 10min, DC pulse ratio 12:2.

[0022] (4) Crushing again with a ba...

Embodiment 2

[0025] A refractory high-entropy alloy powder is composed of titanium, niobium, molybdenum, tantalum and tungsten, five refractory metals with high melting points, and the atomic percentage of each component is 20%, and the material is expressed as Ti 20 Nb 20 Mo 20 Ta 20 W 20 . The alloy powder preparation steps are as follows:

[0026] (1) Five kinds of refractory metal powders of titanium, niobium, molybdenum, tantalum and tungsten are weighed according to atomic percentage. The particle size of the four powders of niobium, molybdenum, tantalum and tungsten are all less than 0.010mm, and the particle size of titanium powder is less than 0.076mm. The purity of metal powder is greater than 99.5%.

[0027] (2) Ball mill and mix the proportioned powder in a high-energy ball mill for 2 hours. The ball to material ratio is 4:1.

[0028] (3) Put the mixed powder in a graphite mold, and perform pressureless sintering in a spark plasma sintering furnace. The protective atmos...

Embodiment 3

[0031] A refractory high-entropy alloy powder is composed of six refractory metals with high melting point, namely chromium, titanium, niobium, molybdenum, tantalum and tungsten. The atomic percentage of each component is 16.7%, and the material is expressed as Ti 16.7 Nb 16.7 Mo 16.7 Ta 16.7 W 16.7 . The alloy powder preparation steps are as follows:

[0032] (1) Weigh five kinds of refractory metal powders of chromium, titanium, niobium, molybdenum, tantalum and tungsten according to atomic percentage. It is 0.076mm, and the purity of all metal powders is greater than 99.5%.

[0033] (2) Ball mill and mix the proportioned powder in a high-energy ball mill for 2.5 hours. The ball-to-material ratio is 5:1.

[0034] (3) Put the mixed powder in a graphite mold, and perform pressureless sintering in a spark plasma sintering furnace. The protective atmosphere is argon, the sintering process parameters are: vacuum degree 5Pa, sintering temperature 1520°C, holding time 12min...

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Abstract

The invention discloses a preparation method of refractory high-entropy alloy powder, which is composed of four or more elements of titanium, vanadium, chromium, zirconium, niobium, molybdenum, tantalum and tungsten in equivalent ratio or near equivalent ratio. According to the invention, ball milling mixing and discharging plasma sintering technologies are used, a solid phase diffusion reaction is carried out at a lower temperature to achieve the alloying process between the refractory metals with high melting points, the process for heating and melting the alloy elements is avoided, the preparation of the refractory high-entropy alloy powder at lower temperature is achieved; meanwhile, the disadvantages of long time of mechanical alloying process and low efficiency are avoided. The preparation method of the refractory high-entropy alloy powder has the advantages of high efficiency and low cost.

Description

technical field [0001] The invention relates to a method for preparing refractory high-entropy alloy powder, and belongs to the technical field of alloy powder preparation. Background technique [0002] High-entropy alloy is a new type of multi-principal alloy developed in recent years. It has become a kind of high-potential alloy due to its good mechanical properties, oxidation resistance, wear resistance, corrosion resistance and high temperature thermal stability. new alloy. High-entropy alloys composed of refractory metals are called refractory high-entropy alloys. Refractory high-entropy alloys have the advantages of both refractory alloys and high-entropy alloys, especially at high temperatures. stability. The economical preparation of high-entropy alloy powders is the prerequisite for realizing the engineering application of high-entropy alloys in the fields of powder metallurgy and thermal spraying. The chemical composition elements of high-entropy alloy powders r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04C22C1/08
CPCB22F3/11B22F9/04B22F2009/043
Inventor 韩杰胜孟军虎张爱军苏博
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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