Method for preparing nano aluminum oxide dispersion iron powder

A technology of nano-alumina and iron powder, which is applied in the field of metal materials, can solve the problems of not meeting high-performance requirements, uneven dispersion, and difficult control, so as to avoid large particles of oxides in the dispersed phase, facilitate popularization and application, and reduce The effect of defects

Inactive Publication Date: 2010-09-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing nano-scale alumina dispersion-strengthened iron powder to solve the existing problems in the prior art, such as high cost, difficult control, uneven dispersion degree, and failure to meet high-performance requirements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: 0.25% Al 2 o 3 Dispersion strengthened iron powder

[0026] (1) Weigh analytically pure Fe(NO 3 ) 3 9H 2 O3 23.2 g, Al(NO 3 ) 3 9H 2 0.83 gram is dissolved in deionized water, and is configured into a 400ml mixed solution;

[0027] (2) Weigh analytically pure (NH) 2 CO2 88 grams were added in the above mixed solution;

[0028] (3) Heating the mixed solution to 70°C, stirring while heating, the reaction time is 5 hours;

[0029] (4) The precipitate is vacuum filtered, and the precipitate is repeatedly washed with deionized water and absolute ethanol to remove impurity ions and water molecules;

[0030] (5) Put the washed precipitated product into a drying oven, slowly dry it at 80°C, and then put it into a muffle furnace for calcination at 500°C to obtain an ultrafine oxide mixed powder;

[0031] (6) Reducing the calcined oxide mixed powder in hydrogen at 600° C. at a reduction temperature of 60 minutes, finally obtaining a dispersion-strengthened i...

Embodiment 2

[0032] Example 2: 2% Al 2 o 3 Dispersion strengthened iron powder

[0033] (1) Weigh analytically pure Fe(NO 3 ) 3 9H 2 O161.6g, Al(NO 3 ) 3 9H 2 Dissolve 3.36 grams of O3 in deionized water to form a 400ml mixed solution;

[0034] (2) Weigh analytically pure (NH) 2 98.2 grams of CO was added to the above mixed solution;

[0035] (3) heating the mixed solution to 80°C, stirring while heating, the reaction time is 4 hours;

[0036] (4) The precipitate is vacuum filtered, and the precipitate is repeatedly washed with deionized water and absolute ethanol to remove impurity ions and water molecules;

[0037] (5) Put the washed precipitated product in a drying oven and slowly dry it at 90°C, and then put it in a muffle furnace for calcination at 600°C to obtain an ultrafine oxide mixed powder;

[0038] (6) Reduce the calcined oxide mixed powder in hydrogen at 700°C, the reduction temperature is 50min,

[0039] Finally, the dispersed phase alumina is nanoscale dispersion...

Embodiment 3

[0040] Example 3: 5% Al 2 o 3 Dispersion strengthened iron powder

[0041] (1) Weigh analytically pure Fe(NO 3 ) 3 9H 2 O80.8g, Al(NO 3 ) 3 9H 2 O4.33 grams were dissolved in deionized water to form a 400ml mixed solution;

[0042] (2) Weigh analytically pure (NH) 2 Add 5.4 grams of CO2 into the above mixed solution;

[0043] (3) Heating the mixed solution to 90°C, stirring while heating, the reaction time is 3 hours;

[0044] (4) The precipitate is vacuum filtered, and the precipitate is repeatedly washed with deionized water and absolute ethanol to remove impurity ions and water molecules;

[0045] (5) Put the washed precipitated product into a drying oven and slowly dry it at 100° C., then put it into a muffle furnace and calcinate it at 700° C. to obtain an ultrafine oxide mixed powder;

[0046] (6) Reduce the calcined oxide mixed powder in hydrogen at 1000°C, the reduction temperature is 40min, and finally obtain the dispersion-strengthened iron powder with the...

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Abstract

The invention discloses a method for preparing nano aluminum oxide dispersion iron powder, which belongs to the technical field of metal dispersion strengthening. The method comprises the following steps of: firstly, preparing mixed solution of ferric nitrate and aluminum nitrate in certain proportion; secondly, adding a proper amount of urea into the solution; thirdly, when the urea is completely dissolved in the solution, heating the solution to the temperature of between 70 and 90 DEG C with stirring to perform a reaction for a certain period of time; fourthly, performing centrifugal separation on an obtained product, putting the product obtained after removing clear solution in a drying box, and drying the product at the temperature of between 80 and 100 DEG C; and finally, calcining the product in a muffle furnace at the temperature of between 500 and 700 DEG C to obtain superfine oxide mixed powder. The method has the advantages that: a precipitating agent in the solution is obtained through urea decomposition to ensure that a precipitation reaction in the solution is performed uniformly; the nucleation rate and the reaction rate of particles can be controlled to obtain nano-particles; the mixed powder which is uniformly mixed and has high dispersibility and fine particle size can be prepared; and the method is easy to apply and popularize.

Description

technical field [0001] The invention belongs to the field of metal materials and belongs to the category of mixed metal oxide powder prepared in liquid phase. It adopts the process of homogeneous precipitation-drying-heat decomposition-hydrogen reduction, integrates relevant knowledge of inorganic chemistry and powder metallurgy, and is suitable for the production of various metal powder products that require good high-temperature performance or mechanical properties. technical background [0002] Dispersion strengthening technology is a very effective means to improve the thermal stability, hardness and strength of high-temperature alloys, and it is also a good method for general metals to improve high-temperature performance and mechanical properties. It is generally believed that the finer the oxide particles and the more uniform the distribution, the more significant the improvement in material performance. Oxide dispersion strengthening has been successfully applied in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/26
Inventor 郭志猛曹慧钦杨薇薇罗骥陈存广
Owner UNIV OF SCI & TECH BEIJING
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