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Preparation method and application of nano-molybdenum powder doped with yttrium oxide nano-particles

A nanoparticle and nanomolybdenum powder technology, applied in the direction of nanotechnology, can solve the problems of large particle size, poor uniformity, high efficiency and low-cost preparation of nanomolybdenum powder, so as to achieve fine particle size and increase the number of nucleation Effect

Active Publication Date: 2021-01-12
西安稀有金属材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the difficulty in controlling the nucleation, growth and final particle size during the solution evaporation process, the particle size and uniformity of the oxide particles doped by the traditional S-L and L-L doping processes are difficult to control, usually with large particle size and poor uniformity
In addition, how to control the particle size of molybdenum and yttrium oxide doped phases in the process of reducing molybdenum oxide to prepare molybdenum powder has always been a big challenge.
Therefore, the high-efficiency and low-cost preparation of nanomolybdenum powder doped with yttrium oxide nanoparticles is still a big problem.

Method used

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  • Preparation method and application of nano-molybdenum powder doped with yttrium oxide nano-particles
  • Preparation method and application of nano-molybdenum powder doped with yttrium oxide nano-particles

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Embodiment 1

[0032] This embodiment includes the following steps:

[0033] Step 1. Ultrasonic dispersion of commercial micron-sized molybdenum trioxide and carbon nanoparticles in ethanol solution with the assistance of surfactant PVP, and then stirring and evaporating to dryness at 70°C to obtain composite powder;

[0034] The average particle size of the commercial micron grade molybdenum trioxide is 4.5 μm, and the mass purity is 99.8%;

[0035] The average particle size of the carbon nanoparticle is 20nm, and the mass content of carbon in the carbon nanoparticle is 99%, and the added quality of the carbon nanoparticle is 4.0% of the commercial micron grade molybdenum trioxide quality; the surfactant PVP The added quality is 0.3% of the total mass of carbon nanoparticles and commercial micron molybdenum trioxide;

[0036] Step 2: Use an ultrasonic nano atomizer to ultrasonically atomize 0.02g / mL of yttrium nitrate solution into ultrafine / nano yttrium salt droplets, and then add 15mL of...

Embodiment 2

[0043] This embodiment includes the following steps:

[0044] Step 1. Ultrasonic dispersion of commercial micron-sized molybdenum trioxide and carbon nanoparticles in ethanol solution with the assistance of surfactant PEG-1000, and then stirring and evaporating to dryness at 75°C to obtain composite powder;

[0045] The average particle size of the commercial micron grade molybdenum trioxide is 1.5 μm, and the mass purity is 99.99%;

[0046] The average particle size of the carbon nanoparticles is 10nm, and the mass content of carbon in the carbon nanoparticles is 99.5%, and the added quality of the carbon nanoparticles is 3.8% of the commercial micron grade molybdenum trioxide quality; the surfactant PEG- The added quality of 1000 is 0.2% of the total mass of carbon nanoparticles and commercial micron-sized molybdenum trioxide;

[0047] Step 2: Use an ultrasonic nano atomizer to ultrasonically atomize 0.01g / mL of yttrium nitrate solution into ultrafine / nano yttrium salt drop...

Embodiment 3

[0052] This embodiment includes the following steps:

[0053] Step 1. Ultrasonic dispersion of commercial micron-sized molybdenum trioxide and carbon nanoparticles in ethanol solution with the assistance of surfactant PVP, and then stirring and evaporating to dryness at 70°C to obtain composite powder;

[0054] The average particle size of the commercial micron grade molybdenum trioxide is 1.5 μm, and the mass purity is 99.99%;

[0055] The average particle size of the carbon nanoparticle is 20nm, and the mass content of carbon in the carbon nanoparticle is 99%, and the added quality of the carbon nanoparticle is 3.9% of the commercial micron grade molybdenum trioxide quality; the surfactant PVP The added quality is 0.3% of the total mass of carbon nanoparticles and commercial micron molybdenum trioxide;

[0056] Step 2: Use an ultrasonic nano atomizer to ultrasonically atomize 0.03g / mL of yttrium nitrate solution into ultrafine / nano yttrium salt droplets, and then add 20mL o...

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Abstract

The invention discloses a preparation method of nano-molybdenum powder doped with yttrium oxide nano-particles. The preparation method comprises the following steps of 1, dispersing commercial micron-sized molybdenum trioxide and carbon nano-particles in a solution, and conducting drying by distillation to obtain composite powder; 2, spraying the ultrafine / nanometer yttrium salt liquid drops intothe composite powder, and conducting drying to obtain a yttrium salt-containing mixture; 3, carrying out segmented heat preservation and reduction on the yttrium salt-containing mixture to obtain ultrafine doped MoO2; and 4, conducting reduction on the ultrafine doped MoO2 by hydrogen to obtain nano-molybdenum powder doped with yttrium oxide nano-particles. The invention also provides an application of the nano-molybdenum powder doped with the yttrium oxide nanoparticles to sintering preparation of a nano-structure oxide dispersion strengthened molybdenum alloy. According to the preparation method, two-step reduction is combined with preparation of the composite powder, so that the nucleation number of a reduction product is increased, the granularity of the reduction product is refined, the granularity of the doping yttrium oxide nano-particles and molybdenum powder is regulated and controlled, and the raw material cost is reduced. The application method is simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of nano-powder material preparation, and in particular relates to a preparation method and application of nano-molybdenum powder doped with yttrium oxide nanoparticles. Background technique [0002] Most of molybdenum products are indispensable key materials in various sectors of national defense and national economy, and have important applications in aerospace, military, chemical, nuclear energy and metallurgy and other fields. Although metal molybdenum materials have a series of excellent physical, chemical and mechanical properties, pure metal molybdenum has the characteristics of easy oxidation at high temperature, low recrystallization temperature, high plastic-brittle transition temperature, low temperature brittleness, brittle fracture after recrystallization and high temperature However, due to insufficient strength, toughness, hardness and wear resistance, it has been difficult to meet the growing ...

Claims

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Application Information

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IPC IPC(8): B22F9/22B22F3/105C22C1/05C22C27/04C22C32/00B82Y40/00
CPCB22F3/105B22F9/22B22F2003/1051B82Y40/00C22C1/05C22C27/04C22C32/0031
Inventor 孙国栋闫树欣刘璐胡小刚邱龙时潘晓龙田丰张于胜
Owner 西安稀有金属材料研究院有限公司
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