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Preparing method for oxide dispersion strengthening iron-cobalt-nickel medium-entropy alloy

A technology of dispersion strengthening and iron-cobalt-nickel, which is applied in the field of medium entropy alloy material preparation, can solve the problems of unsuitability for large-scale production, waste of materials, low powder yield, etc., and achieve suitable for large-scale industrial production, simple preparation process and low cost low effect

Inactive Publication Date: 2018-11-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most oxide dispersion strengthened materials are prepared by mechanical alloying. This preparation method will introduce more impurities, and the powder extraction rate is low, and the waste of materials is serious, so it is not suitable for large-scale production.
The chemical co-precipitation method is another important method for preparing composite oxide ultrafine powders containing two or more metal elements. It can directly obtain nano-powder materials with uniform chemical composition through chemical reactions, and it is easy to prepare small particle size and distribution. Uniform nano-powder material, but this method is limited to the use of metal salts of all elements in the material can react with the precipitant to form the corresponding oxide or hydroxide precipitation
At present, there is no report on the preparation of oxide dispersion strengthened iron-cobalt-nickel medium-entropy alloys by chemical co-precipitation method.

Method used

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  • Preparing method for oxide dispersion strengthening iron-cobalt-nickel medium-entropy alloy
  • Preparing method for oxide dispersion strengthening iron-cobalt-nickel medium-entropy alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Weigh 269.38g FeCl_3∙6H 2 O, 237.46 g CoCl 2 ∙6H 2 O, 236.50g NiCl 2 ∙6H 2 O and 1.172g Y (NO 3 ) 3 ∙6H 2 O. These compounds were then dissolved in deionized water to form a dilute solution, and water bath heating and magnetic stirring were carried out during the dissolution process to speed up the dissolution rate.

[0028] 2. Prepare a sodium hydroxide solution with a concentration of 10g / 100ml, and titrate it into the mixed solution prepared in step (1) at a uniform speed. During the titration, the solution is continuously stirred and heated in a water bath at 60°C to make the ferric hydroxide , cobalt hydroxide, nickel hydroxide and yttrium hydroxide are precipitated together, and finally a precipitate in which these hydroxides are evenly mixed is obtained.

[0029] 3. The obtained mixed precipitate was repeatedly suction-filtered and dissolved 5 times, and then washed, and the washed precipitate was put into a vacuum drying oven for drying at 80° C. for ...

Embodiment 2

[0034] 1. Weigh 269.38g FeCl 3 ∙6H 2 O, 237.46 g CoCl 2 ∙6H 2 O, 236.50gNiCl 2 ∙6H 2 O and 2.93g Y(NO 3 ) 3 ∙6H 2 O. These compounds were then dissolved in deionized water to form a dilute solution, and water bath heating and magnetic stirring were carried out during the dissolution process to speed up the dissolution rate.

[0035] 2. Prepare a sodium hydroxide solution with a concentration of 8g / 100ml, and titrate it into the mixed solution prepared in step (1) at a uniform speed. During the titration process, the solution is continuously stirred and heated at 50°C to make ferric hydroxide, Cobalt hydroxide, nickel hydroxide and yttrium hydroxide are precipitated together, and finally a precipitate is obtained in which these hydroxides are uniformly mixed.

[0036] 3. The obtained mixed precipitate was repeatedly suction-filtered and dissolved 5 times, and then washed, and the washed precipitate was put into a vacuum drying oven for drying at 80° C. for 1.5 hours. ...

Embodiment 3

[0040]1. Weigh 269.38g FeCl 3 ∙6H 2 O, 237.46 g CoCl 2 ∙6H 2 O, 236.50gNiCl 2 ∙6H 2 O and 4.102g Y (NO 3 ) 3 ∙6H 2 O. These compounds were then dissolved in deionized water to form a dilute solution, and water bath heating and magnetic stirring were carried out during the dissolution process to speed up the dissolution rate.

[0041] 2. Prepare a sodium hydroxide solution with a concentration of 12g / 100ml, and titrate it into the mixed solution prepared in step (1) at a uniform speed. During the titration process, the solution is continuously stirred and heated at 50°C to make ferric hydroxide, Cobalt hydroxide, nickel hydroxide and yttrium hydroxide are precipitated together, and finally a precipitate is obtained in which these hydroxides are uniformly mixed.

[0042] 3. The obtained mixed precipitate was repeatedly suction-filtered and dissolved 6 times, and then washed, and the washed precipitate was put into a vacuum drying oven for drying at 80° C. for 2 hours. ...

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Abstract

The invention provides a preparing method for an oxide dispersion strengthening iron-cobalt-nickel medium-entropy alloy. A dispersion strengthening phase is yttrium oxide. Ferric trichloride hexahydrate serves as an iron source, cobalt chloride hexahydrate serves as a cobalt source, nickel chloride hexahydrate serves as a nickel source, yttrium nitrate hexahydrate serves as a yttrium source, a sodium hydroxide solution serves as a precipitator, and iron, cobalt, nickel and yttrium ions generate corresponding hydroxide coprecipitation. Then, obtained precipitation is washed, dried and roasted,and ferric hydroxide, cobaltous hydroxide, nickelous hydroxide and yttrium hydroxide in the precipitation are decomposed into corresponding oxide. The roasted oxide powder is subjected to high-temperature reducing in the hydrogen atmosphere, and since yttrium oxide cannot be reduced, the mixture powder of iron, cobalt, nickel and yttrium oxide is finally obtained. The obtained powder is sintered,and the oxide dispersion strengthening iron-cobalt-nickel medium-entropy alloy is obtained.

Description

technical field [0001] The invention belongs to the field of preparation of medium-entropy alloy materials, and in particular relates to a preparation method of oxide dispersion strengthened medium-entropy alloy. Background technique [0002] At present, most of the existing alloys are based on one main element and doped with other small elements. In recent years, more and more attention has been paid to the materials with equiatomic ratio or close to equiatomic ratio as the principal element of various elements with close atomic radius. Among them, the alloy with the principal element number of 2~4 is called middle entropy alloy. The medium-entropy alloy with iron, cobalt and nickel as the main components has a series of excellent properties such as good plasticity, excellent corrosion resistance and wear resistance, but its hardness and strength are relatively low, which greatly limits its application. (Tsau C H, Wang W L. Microstructures, Hardness and Corrosion Behaviors...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/10C22C1/05B22F9/22
CPCB22F9/22C22C1/05C22C30/00
Inventor 常永勤李明洋郭远航李吴铭纪庆竹
Owner UNIV OF SCI & TECH BEIJING
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