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Preparation method of prealloying powder for dispersion strengthening metal by low-temperature combustion synthesis method

A low-temperature combustion synthesis and pre-alloyed powder technology, applied in the field of dispersion strengthening, can solve problems such as threats to the health of operators, difficult control of technical operations, deterioration of material conductivity, etc., to reduce energy consumption and pollution, small size, simple method Effect

Inactive Publication Date: 2011-01-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent application No. 94112582.3 discloses a mechanical ball milling alloying method to prepare dispersion strengthened copper resistance welding electrode materials. This method is simple and effective, but there is a problem that the ball milling medium (such as Fe) will deteriorate the electrical conductivity of the material.
Chinese patent application No. 200610128421.8 discloses a method of internal oxidation to prepare Al 2 o 3 Dispersion strengthened copper alloy material, this method can obtain fine dispersed phase particles, and the distribution is relatively uniform, but the scope of application is narrow, and the technical operation is not easy to control
Chinese patent application No. 200610112815.4 discloses a method for preparing nano-scale aluminum oxide dispersed iron powder by co-precipitation. The dispersed phase particles prepared by this method are fine and uniformly distributed, but the production efficiency is low and the cost is high. It is used to make relatively special alloys, and poses a threat to the health of operators and will cause air pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Implementation example 1: 2% nano-alumina dispersion strengthened iron-based powder

[0025] 1. Add deionized water dropwise to analytical pure absolute ethanol to prepare 75ml of ethanol aqueous solution with ethanol volume fraction of 10%;

[0026] 2. Add 1ml PEG-200 dropwise to the prepared ethanol aqueous solution;

[0027] 3. Weigh the analytically pure Fe(NO 3 ) 3 9H 2 O 202.2075g, Al(NO 3 ) 3 9H 2 O 4.2073g was dissolved in ethanol solution;

[0028] 4. Add 50.3095g urea (urea) and stir evenly;

[0029] 5. Put the above mixed solution in a microwave oven and heat it to 200°C. The solution boils rapidly, condenses and expands until self-propagating combustion, and fluffy powder is collected after the combustion is completed;

[0030] 6. Put the above powder into a porcelain boat, place it in a muffle furnace and calcinate at 450°C for 1 hour to obtain an ultrafine oxide solid solution precursor powder;

[0031] 7. The precursor powder was reduced in a hyd...

Embodiment 2

[0032] Implementation example 2: 0.8% nanometer yttrium oxide dispersion strengthened cobalt-based powder

[0033] 1. Add deionized water dropwise to analytical pure absolute ethanol to prepare 50ml of ethanol aqueous solution with ethanol volume fraction of 90%;

[0034] 2. Add 0.5ml PEG-400 dropwise to the prepared ethanol aqueous solution;

[0035] 3. Weigh the analytically pure Co(NO 3 ) 2 ·6H 2 O 145.5260g, Y (NO 3 ) 3 ·6H 2 O 0.8102g is dissolved in ethanol solution;

[0036] 4. Add 67.0710g of malic acid and stir well;

[0037] 5. Put the above mixture in a microwave oven and heat it to 250°C. The solution boils rapidly, condenses and expands until it burns by itself, and collects fluffy powder after the combustion is complete;

[0038] 6. Put the above powder into a porcelain boat, place it in a muffle furnace and calcinate at 500°C for 1.5h to obtain an ultrafine oxide solid solution precursor powder;

[0039] 7. The precursor powder was reduced in a hydrogen...

Embodiment 3

[0040] Implementation example 3: 1% nano-alumina dispersion strengthened copper-based powder

[0041] 1. Add deionized water dropwise to analytical pure absolute ethanol to prepare 60ml of ethanol aqueous solution with ethanol volume fraction of 70%;

[0042] 2. Add 1ml PEG-200 dropwise to the prepared ethanol aqueous solution;

[0043] 3. Weigh analytically pure Cu(NO 3 ) 3 ·3H 2 O 120.8086g, Al(NO 3) 3 9H 2 O 2.3566g was dissolved in ethanol solution;

[0044] 4. Add 90.1090g of malic acid and urea (urea) mixture, stir well;

[0045] 5. Put the above mixture in a microwave oven and heat it to 280°C. The solution boils rapidly, condenses and expands until it self-propagates and burns, and fluffy powder is collected after the combustion is completed;

[0046] 6. Put the above powder into a porcelain boat, place it in a muffle furnace and calcine at 600°C for 1.8 hours to obtain an ultrafine oxide solid solution precursor powder;

[0047] 7. The precursor powder was re...

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Abstract

The invention provides a preparation method of prealloying powder for dispersion strengthening metal by a low-temperature combustion synthesis method, comprising the following steps of: adding a mixture of base metal nitrate and second phase nitrate to an aqueous solution of ethanol with a solved dispersant, and then adding an organic combustion improver to the mixing solution to mix evenly so as to form a highly dispersed reaction system, heating the reaction system to fast generate auto-combustion, and obtaining ultrafine precursor powder after the product is combusted by a muffle furnace, and then placing the precursor powder under the atmosphere of hydrogen for carrying out selective reduction to obtain the prealloying powder for the dispersion strengthening metal with ultrafine and evenly distributed second phase particles. The invention has the advantages that: in the prepared prealloying powder, the second phases are ultrafine in size and evenly distributed, and the final product has excellent property; the cost is low, the method is simple, the operation is easy, the reaction condition is gentle, the period is short, and the energy consumption and the pollution can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of dispersion strengthening in powder metallurgy production technology, and relates to a method for preparing prealloyed powder for dispersion strengthening metal by a low-temperature combustion synthesis method. technical background [0002] The second phase dispersion strengthening is a method of strengthening the alloy with a large strengthening effect, and it is very promising. Oxide dispersion strengthening technology is widely used to improve the high-temperature performance of materials, and has achieved huge economic and social benefits in the field of traditional materials. Due to the characteristics of high hardness, good thermal stability, incompatibility with the matrix metal, and easy access to fine particles, oxides are most suitable for use as second phase (disperse phase) particles. Therefore, people use powder metallurgy to uniformly add fine oxides with high stability in the high temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C32/00C22C1/04B22F9/22
Inventor 郝俊杰陈存广郭志猛林涛罗骥邵慧萍杨薇薇
Owner UNIV OF SCI & TECH BEIJING
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