Method for manufacturing high-dispersion ultrafine molybdenum-based powder

A powder, molybdenum-based technology is applied in the field of low-cost preparation of high-dispersion ultra-fine molybdenum-based powder, which can solve the problems of difficulty in high-dispersion ultra-fine molybdenum-based powder, and achieve the effects of low cost, small particle size and high density

Active Publication Date: 2013-04-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of molybdenum-based powders mainly adopts methods such as mechanical alloying, co-precipitation, sol-gel,

Method used

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  • Method for manufacturing high-dispersion ultrafine molybdenum-based powder

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example 1: Mo-4wt.%La 2 O 3 Preparation of composite powder

[0017] Weigh 0.024mol of (NH 4 ) 6 Mo 7 O 24 ·4H 2 O, 0.00412mol La(NO 3 ) 3· 6H 2 O, 0.48mol HNO 3 , 0.1mol of CH 4 N 2 O and 0.1 mol of C 6 H 12 O 6 ·H 2 O, dissolve in 100ml deionized water, stir evenly in a 1000ml beaker to obtain a mixed solution. The mixed solution is heated in a temperature-controlled furnace to volatilize the aqueous solution. As the reaction progresses, the heat released causes the dispersant to undergo pyrolysis and carbonization, and the target element is transformed into extremely fine-sized nano oxide particles and molybdenum oxide particles, thereby obtaining Mo-rare earth oxide composite powder particles. The calcined precursor powder is reduced in hydrogen: the reduction temperature is 450°C and the temperature is kept for 1 hour. Mo-4wt.%La is obtained after reduction 2 O 3 Composite powder.

Example Embodiment

[0018] Example 2: Mo-25wt.%Y 2 O 3 Preparation of composite powder

[0019] Weigh 0.024mol of (NH 4 ) 6 Mo 7 O 24 ·4H 2 O, 0.0476mol Y(NO 3 ) 3· 6H 2 O, 0.48mol HNO 3 , 0.17mol of CH 4 N 2 O and 0.15mol of C 6 H 12 O 6 ·H 2 O, dissolve in 100ml deionized water, stir evenly in a 1000ml beaker to obtain a mixed solution. The mixed solution is heated in a temperature-controlled furnace to volatilize the aqueous solution. As the reaction progresses, the heat released causes the dispersant to undergo pyrolysis and carbonization, and the target element is transformed into extremely fine-sized nano oxide particles and molybdenum oxide particles, thereby obtaining Mo-rare earth oxide composite powder particles. The calcined precursor powder is reduced in an atmosphere of decomposing ammonia: the reduction temperature is 550°C, and the temperature is kept for 1.5 hours. After reduction, Mo-25wt.%Y is obtained 2 O 3 Composite powder.

Example Embodiment

[0020] Example 3: Mo-8wt.%La 2 O 3 -22wt.%Y 2 O 3 Preparation of composite powder

[0021] Weigh 0.024mol of (NH 4 ) 6 Mo 7 O 24 ·4H 2 O, 0.0086mol La(NO 3 ) 3· 6H 2 O, 0.040 mol of Y(NO 3 ) 3· 6H 2 O, 0.72mol HNO 3 , 0.12mol of CH 4 N 2 O and 0.17mol of C 6 H 12 O 6 ·H 2 O, dissolve in 100ml deionized water, stir evenly in a 1000ml beaker to obtain a mixed solution. The mixed solution is heated in a temperature-controlled furnace to volatilize the aqueous solution. As the reaction progresses, the heat released causes the dispersant to undergo pyrolysis and carbonization, and the target element is transformed into extremely fine-sized nano oxide particles and molybdenum oxide particles, thereby obtaining Mo-rare earth oxide composite powder particles. The calcined precursor powder is reduced in an atmosphere of decomposing ammonia: the reduction temperature is 650°C, and the temperature is kept for 2 hours. Mo--8wt.%La is obtained after reduction 2 O 3 -22wt.%Y 2 O ...

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Abstract

The invention discloses a method for manufacturing high-dispersion ultrafine molybdenum-based powder, and belongs to the technical field of rare-earth refractory metal materials. A technological process includes acquiring precursor powder comprising molybdenum oxide, rare-earth oxide (one or two of Y<2>O<3> and La<2>O<3>) or copper oxide which are mixed uniformly by low-temperature combustion synthesis; and reducing the precursor powder in flowing hydrogen atmosphere. The molybdenum oxide and the copper oxide which are easy to reduce are reduced into metal molybdenum and copper, rare-earth oxide particles which cannot be reduced remain, and accordingly high-dispersion ultrafine Mo and rare-earth oxide powder or high-dispersion ultrafine Mo-Cu composite powder is obtained. The weight percent of the rare-earth oxide in the Mo and rare-earth oxide powder ranges from 0.5% to 30%, and the weight percent of the Cu in the Mo-Cu composite powder ranges from 5% to 40%. The method has the advantages that the powder particles are small in diameter and high in surface activity, a dispersion path in a sintering procedure is shortened, and the method is beneficial to acquiring high-density ultrafine-grain/nano-grain molybdenum-based alloy with uniform tissue distribution.

Description

[0001] technical field [0002] The invention belongs to the technical field of refractory metal powder preparation, and particularly provides a low-cost method for preparing highly dispersed ultrafine molybdenum-based powder. Background technique [0003] Molybdenum has the advantages of high melting point, low density (only 1 / 2 of tungsten), high temperature strength, good electrical and thermal conductivity, low thermal expansion coefficient and excellent corrosion resistance. It is used in microelectronics, national defense, aerospace, nuclear energy, etc. The field has important uses, both as structural materials and as new functional materials. Doping rare earth elements can increase the recrystallization temperature of pure molybdenum, and the resulting high-temperature molybdenum alloys (such as rare earth oxide dispersion-strengthened molybdenum alloys) not only have good high-temperature strength and creep resistance, but also have excellent properties after high-t...

Claims

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Application Information

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IPC IPC(8): B22F9/22
Inventor 章林刘烨秦明礼何新波曲选辉
Owner UNIV OF SCI & TECH BEIJING
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