Preparation method of prealloy powder for nano level oxide dispersion strengthened metal

A nano-scale oxide and pre-alloyed powder technology, which is applied in the field of pre-alloyed powder for preparing nano-scale oxide dispersion-strengthened metals, can solve the problems of not meeting high performance requirements, uneven dispersion, and difficult control The effect of good consistency, reduced defects, and low cost

Inactive Publication Date: 2009-03-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can improve the performance of the material to a certain extent, but there are disadvantages such as high cost, difficult control, uneven dispersion, and failure to meet high performance requirements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: 1.0% alumina dispersion strengthened iron-based alloy

[0022] 1) Weigh 108 grams of analytically pure citric acid, dissolve it in deionized water, and configure it into a 1000ml solution;

[0023] 2) Weigh the analytically pure Fe(NO 3 ) 3 .9H 2 O 202 g, Al(NO 3 ) 3 .9H 2 O 4.2 grams, dissolve in the citric acid aqueous solution;

[0024] 3) Add 11 grams of ethylene glycol as a dispersant, and slowly add ammonia water dropwise under magnetic stirring to adjust the pH value of the solution to 6;

[0025] 4) Put it into a water bath at 80°C for constant temperature heating and evaporation to form a sol;

[0026] 5) After the gel is formed, put it in an oven for drying at 100°C to obtain a xerogel, and then bake it in a muffle furnace at 500°C to obtain a super gel.

[0027] Fine oxide mixed powder;

[0028] 6) reducing the above-mentioned calcined oxide in a hydrogen flow at 500° C. for 60 minutes to obtain iron powder dispersed in nano-alumina;

[0...

Embodiment 2

[0030] Example 2: 2.0% Yttria Dispersion Strengthened Iron-Based Alloy

[0031] 1) Weigh 106 grams of analytically pure citric acid, dissolve it in deionized water, and configure it into a 600ml solution;

[0032] 2) Weigh the analytically pure Fe(NO 3 ) 3 .9H 2 O 202 grams, Y (NO 3 ) 3 .6H 2 O 1.94 grams, dissolved in citric acid aqueous solution;

[0033] 3) Add 15 grams of ethylene glycol as a dispersant, and slowly add ammonia water dropwise under magnetic stirring to adjust the pH value of the solution to 8;

[0034] 4) Put it into a water bath at 100°C for constant temperature heating and evaporation to form a sol;

[0035] 5) After forming the gel, put it in an oven for drying at 120°C to obtain a xerogel, and then roast it in a muffle furnace at 800°C to obtain an ultrafine oxide mixed powder;

[0036] 6) reducing the above-mentioned calcined oxide in a hydrogen flow at 800° C. for 40 minutes to obtain iron powder dispersed in nanometer yttrium oxide;

[0037]...

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PUM

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Abstract

The invention provides a method used for preparing pre-alloy powder used for nanometer dispersion enhanced metal, belonging to the field of metal dispersion enhancement. Nitrate mixture containing basal body and disperse phase metal ion is dissolved in citric acid aqueous solution of a certain consistency; the pH value of the solution and adding quantity of the dispersant are controlled; the solution is arranged in a water-bath boiler and heated with constant temperature so as to vaporize the water and be matched with the reaction to gain sol; after the sol is formed, the sol is arranged in a drying box and dried to gain xerogel; subsequently, the xerogel is baked in a muffle furnace so as to gain ultra-fine oxide mixed powder; the gained mixture is selectively reduced in hydrogen flow (the disperse phase oxide is generally a ceramic-typed metal oxide and can not be reduced by hydrogen under general conditions) so as to gain the pre-alloy powder which is gained by uniform mixing of nanometer oxide grains and nanometer-based metal grains; the pre-alloy powder is pressed and sintered to gain the product with excellent performance. The method has the advantages that in the prepared pre-alloy powder, the disperse phase oxide has small dimension and good forming performance; the disperse phase has uniform distribution; furthermore, the process control is simple and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of metal dispersion strengthening of metal materials, and provides a method for preparing prealloyed powder for nanoscale oxide dispersion strengthening metal. It adopts the process of complex sol-gel-drying-roasting-hydrogen reduction, integrates the relevant knowledge of organic chemistry, colloid chemistry, inorganic chemistry and powder metallurgy, and belongs to the category of liquid-phase mixed metal oxide powder. It 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/26
Inventor 郭志猛李美霞郝俊杰陈敏邵慧萍
Owner UNIV OF SCI & TECH BEIJING
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