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Method for manufacturing high-dispersion ultrafine molybdenum-based powder

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

Active Publication Date: 2014-12-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation of molybdenum-based powders mainly adopts methods such as mechanical alloying, co-precipitation, sol-gel, spray drying, electrodeposition, etc., but it is difficult to prepare highly dispersed ultra-fine molybdenum-based powders

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: Mo-4wt.%La 2 O 3 Preparation of composite powder

[0016] Weigh 0.024mol of (NH 4 ) 6 Mo 7 o 24 4H 2 O, 0.00412mol of La(NO 3 ) 3· 6H 2 O, 0.48mol of HNO 3 , 0.1mol of CH 4 N 2 O and 0.1 mol of C 6 h 12 o 6 ·H 2 O, dissolved in 100ml deionized water, stirred 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 proceeds, the heat released will cause pyrolysis and carbonization of the dispersant, and the target element will be converted into extremely fine nano-sized 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. After reduction, Mo-4wt.%La is obtained 2 o 3 Composite powder.

Embodiment 2

[0017] Embodiment 2: Mo-25wt.%Y 2 O 3 Preparation of composite powder

[0018] Weigh 0.024mol of (NH 4 ) 6 Mo 7 o 24 4H 2 O, 0.0476mol of Y (NO 3 ) 3· 6H 2 O, 0.48mol of HNO 3 , 0.17mol of CH 4 N 2 O and 0.15mol of C 6 h 12 o 6 ·H 2 O, dissolved in 100ml deionized water, stirred 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 proceeds, the heat released will cause pyrolysis and carbonization of the dispersant, and the target element will be converted into extremely fine nano-sized 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 decomposed 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.

Embodiment 3

[0019] Embodiment 3: Mo-8wt.%La 2 O 3 -22wt.%Y 2 O 3 Preparation of composite powder

[0020] Weigh 0.024mol of (NH 4 ) 6 Mo 7 o 24 4H 2 O, 0.0086mol of La(NO 3 ) 3· 6H 2 O, 0.040 mol of Y (NO 3 ) 3· 6H 2 O, 0.72mol of HNO 3 , 0.12mol of CH 4 N 2 O and 0.17 mol of C 6 h 12 o 6 ·H 2 O, dissolved in 100ml deionized water, stirred 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 proceeds, the heat released will cause pyrolysis and carbonization of the dispersant, and the target element will be converted into extremely fine nano-sized 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 decomposed ammonia: the reduction temperature is 650° C., and the temperature is kept for 2 hours. After reduction, Mo...

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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

technical field [0001] 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 [0002] 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-temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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