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High-strength Mo-Hf-CNT molybdenum-based composite material and a preparation method thereof

A composite material, mo-hf-cnt technology, applied in the field of high-strength Mo-Hf-CNT molybdenum-based composite material and its preparation, can solve the problems of low strength and small quantity of MHC alloys

Inactive Publication Date: 2020-04-21
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, graphite particles are relatively large, and they are randomly and uniformly distributed after mixing. It takes a long time for Hf atoms to diffuse to form dispersed HfC, so the amount formed is relatively small, and the strength of MHC alloy is low.

Method used

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  • High-strength Mo-Hf-CNT molybdenum-based composite material and a preparation method thereof
  • High-strength Mo-Hf-CNT molybdenum-based composite material and a preparation method thereof
  • High-strength Mo-Hf-CNT molybdenum-based composite material and a preparation method thereof

Examples

Experimental program
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Embodiment 1

[0023] In the Mo-Hf-CNT molybdenum-based composite material in this embodiment, carbon nanotubes are used as the carbon source, and the components are constituted by mass percentage: Hf 1.2%, CNT 0.1%, and the balance is Mo.

[0024] The original powder particle size is: HfH 2 The particle size of the powder is 3-5 microns, the outer diameter of the multi-walled CNT powder is greater than 50 nanometers, the inner diameter is 5-15 nanometers, and the length is 0.5-2 microns, and the particle size of the Mo powder is 3-5 microns.

[0025] The preparation method of high-strength Mo-Hf-CNT molybdenum-based composite material in the present embodiment comprises the following steps:

[0026] 1. Mix powder in liquid phase: weigh 0.6g HfH according to the proportion 2 powder and 0.05g CNT powder were placed in a beaker with 200ml of alcohol and heated to 50°C. Ultrasonic stirring was required while the CNT powder was being heated for 2 hours. The solutions were named A and B respecti...

Embodiment 2

[0031] In the Mo-Hf-CNT molybdenum-based composite material in this embodiment, carbon nanotubes are used as the carbon source, and the components are constituted by mass percentage: Hf 1.2%, CNT 0.1%, and the balance is Mo.

[0032] The original powder particle size is: HfH 2 The particle size of the powder is 3-5 microns, the outer diameter of the multi-walled CNT powder is greater than 50 nanometers, the inner diameter is 5-15 nanometers, and the length is 0.5-2 microns, and the particle size of the Mo powder is 3-5 microns.

[0033] The preparation method of high-strength Mo-Hf-CNT molybdenum-based composite material in the present embodiment comprises the following steps:

[0034] 1. Mix powder in liquid phase: weigh 0.6g HfH according to the proportion 2 powder and 0.05g CNT powder were placed in beakers filled with 200ml of alcohol and heated to 50°C. Ultrasonic stirring was required while the CNT powder was heating for 2 hours. The solutions were named A and B respect...

Embodiment 3

[0039] In the Mo-Hf-CNT molybdenum-based composite material in this embodiment, carbon nanotubes are used as the carbon source, and the components are constituted by mass percentage: Hf 1.2%, CNT 0.1%, and the balance is Mo.

[0040] The original powder particle size is: HfH 2 The particle size of the powder is 3-5 microns, the outer diameter of the multi-walled CNT powder is greater than 50 nanometers, the inner diameter is 5-15 nanometers, and the length is 0.5-2 microns, and the particle size of the Mo powder is 3-5 microns.

[0041] The preparation method of high-strength Mo-Hf-CNT molybdenum-based composite material in the present embodiment comprises the following steps:

[0042] 1. Mix powder in liquid phase: weigh 0.36g HfH according to the proportion 2 powder and 0.03g CNT powder were placed in beakers filled with 200ml of alcohol and heated to 50°C. Ultrasonic stirring was required while the CNT powder was heating for 2 hours. The solutions were named A and B respec...

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Abstract

The invention discloses a high-strength Mo-Hf-CNT molybdenum-based composite material and a preparation method thereof. The Mo-Hf-CNT molybdenum-based composite material is a molybdenum alloy obtainedby doping HfH2 and CNT into molybdenum, and comprises the following components in percentage by mass: 1.2% of Hf, 0.1% of CNT and the balance Mo. According to the high-strength Mo-Hf-CNT molybdenum-based composite material and the preparation method thereof, carbon nanotubes are adopted to replace graphite to serve as a carbon source of the MHC molybdenum alloy, and the hardness and yield strength of the prepared Mo-Hf-CNT molybdenum-based composite material are effectively improved through optimization of processes such as ball milling and spark plasma sintering.

Description

technical field [0001] The invention relates to a metal composite material and a preparation method thereof, in particular to a high-strength Mo-Hf-CNT molybdenum-based composite material and a preparation method thereof. Background technique [0002] Pure molybdenum is easy to oxidize at high temperature, has a low recrystallization temperature, and is not easy to process at room temperature. By adding other elements to molybdenum, many systems of molybdenum-based alloys have been developed. Among them, MHC molybdenum alloy has been widely used in the field of metal processing and forming. [0003] General powder metallurgy MHC alloys are prepared by adding carbon black and hafnium hydride powder to molybdenum powder, mixing them and then performing hydrogen or vacuum sintering. Part of the hafnium in the obtained MHC alloy is solid-dissolved in the molybdenum matrix, and part of the hafnium is easily combined with oxygen during the powder metallurgy process to form oxides...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/05B22F3/105
CPCB22F3/105B22F2003/1051C22C1/05C22C27/04C22C2026/002
Inventor 吴玉程卫勇罗来马昝祥朱晓勇
Owner HEFEI UNIV OF TECH
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