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Composite powder formed by uniformly doping nano-La2O3 in nano-Mo and preparation method thereof

A composite powder and uniform doping technology, which is applied in the field of nano-La2O3 doping, can solve the problems of low efficiency, long cycle, complex process, etc., and achieve the effects of high efficiency, short reaction time and low synthesis temperature

Active Publication Date: 2017-02-01
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, because the existing liquid-liquid doping technology still has problems such as complex process, long cycle and low efficiency, most of the industrial production still adopts solid-solid doping and solid-liquid doping technology to prepare rare earth molybdenum oxide doping. Molybdenum powder

Method used

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  • Composite powder formed by uniformly doping nano-La2O3 in nano-Mo and preparation method thereof
  • Composite powder formed by uniformly doping nano-La2O3 in nano-Mo and preparation method thereof
  • Composite powder formed by uniformly doping nano-La2O3 in nano-Mo and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A nano La 2 o 3 The preparation process of uniformly doped nano-molybdenum composite powder is as follows: figure 1 shown.

[0028] (1) Put 12.4g of ammonium molybdate tetrahydrate, 16g of ammonium nitrate, 8g of glycine and 0.22g of lanthanum nitrate hexahydrate into a 1000ml beaker, add 100ml of deionized water, and stir until completely dissolved to form a mixed solution.

[0029] (2) Place the beaker containing the above mixed solution on a heating furnace and heat it at 200°C.

[0030] (3) After the solution boils for 3 to 5 minutes, add 4.5g of glucose and stir fully at the same time.

[0031] (4) Continue to heat the solution after adding glucose at 200°C. When the solution forms a light blue sol, lower the temperature to 160°C. The reaction begins and a fluffy foam-like substance is formed. After 3 to 5 minutes, the reaction end, get La 2 o 3 / MoO x Precursor powder. Its TG / DSC curve is as follows figure 2 shown.

[0032] (5) The above La 2 o 3 / MoO ...

Embodiment 2

[0036] (1) Put 12.4g of ammonium molybdate tetrahydrate, 20g of ammonium nitrate, 8g of glycine and 0.55g of lanthanum nitrate hexahydrate into a 1000ml beaker, add 100ml of deionized water, and stir until completely dissolved to form a mixed solution.

[0037] (2) Place the beaker containing the above mixed solution on a heating furnace and heat it at 200°C.

[0038] (3) After the solution boils for 3 to 5 minutes, add 6.8g of glucose and stir fully at the same time.

[0039] (4) Continue to heat the solution after adding glucose at 200°C. When the solution forms a light blue sol, lower the temperature to 160°C. The reaction begins and a fluffy foam-like substance is formed. After 3 to 5 minutes, the reaction end, get La 2 o 3 / MoO x Precursor powder.

[0040] (5) The above La 2 o 3 / MoO x The precursor powder was put into the atmosphere heating furnace, and reduced at 750°C for 3 hours under the flowing hydrogen of 900ml / min. After the reduction, it was cooled with th...

Embodiment 3

[0044] (1) Put 12.4g of ammonium molybdate tetrahydrate, 24g of ammonium nitrate, 8g of glycine and 0.94g of lanthanum nitrate hexahydrate into a 1000ml beaker, add 100ml of deionized water, and stir until completely dissolved to form a mixed solution.

[0045] (2) Place the beaker containing the above mixed solution on a heating furnace and heat it at 200°C.

[0046] (3) After the solution boils for 3-5 minutes, add 9g of glucose and stir fully at the same time.

[0047] (4) Continue to heat the solution after adding glucose at 200°C. When the solution forms a light blue sol, lower the temperature to 160°C. The reaction begins and a fluffy foam-like substance is formed. After 3 to 5 minutes, the reaction end, get La 2 o 3 / MoO x Precursor powder.

[0048] (5) The above La 2 o 3 / MoO x The precursor powder was put into the atmosphere heating furnace, under the flowing hydrogen of 1000ml / min, the reduction was carried out at 700°C for 4 hours, after the reduction was com...

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Abstract

The invention discloses composite powder formed by uniformly doping nano-La2O3 in nano-Mo. The size of the La2O3 and Mo composite powder is 30-100 nm, and the La2O3 content is 0.5-5.0wt.%. The invention further discloses a preparation method of the composite powder. The method includes the technological processes of solution preparing, solution heating, glucose adding, precursor synthesizing, precursor reduction and forming of the composite powder through uniformly doping of the nano-La2O3 in the nano-Mo. According to the composite powder formed by uniformly doping the nano-La2O3 in the nano-Mo and the preparation method thereof, uniform dispersion and stability of nano-particles are guaranteed, and moreover, the powder size can be effectively adjusted and controlled; and meanwhile, the precursor reaction synthesis temperature is low, the reaction time is short, the efficiency is high, energy saving is achieved, and operation is simple.

Description

technical field [0001] The present invention relates to nanometer La 2 o 3 The technical field of doping, specifically referring to a kind of nanometer La 2 o 3 Uniformly doped nano-molybdenum composite powder and its preparation method. Background technique [0002] Metal molybdenum is an important refractory metal material. Due to the poor toughness of molybdenum at room temperature and the high ductile-brittle transition temperature (DBTT), the toughness is still insufficient at higher temperatures. These defects limit the use of molybdenum and molybdenum alloys in structural materials. aspects of application. Using La 2 o 3 The rare earth oxide doped molybdenum alloy prepared by rare earth oxide doping technology has good room / high temperature strength and toughness. The uniform dispersion and refinement of rare earth oxide particles is the difficulty and key point of rare earth oxide doping technology. [0003] At present, there are three methods for preparing r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/22B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00B22F9/22B22F2999/00B22F1/054B22F2201/013
Inventor 古思勇张厚安张勇麻季冬廉冀琼马丽丽
Owner XIAMEN UNIV OF TECH
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