Method of preparing ultrafine alloy powder by coprecipitation coreduction

An alloy powder and co-precipitation technology, which is applied in the field of co-precipitation-co-reduction to prepare ultra-fine alloy powder, can solve the problems of coarse alloy powder particle size and poor sintering performance, and achieve controllable particle size, low cost and simple equipment. Effect

Inactive Publication Date: 2006-09-13
UNIV OF SCI & TECH BEIJING
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  • Summary
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AI Technical Summary

Problems solved by technology

The atomization method is a common method for preparing alloy powders. Its advantage is that alloy powders of various components can be synthesized by smelting. However, the alloy powders prepared by the atomization method generally have coarse particle size and poor sintering performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: with iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O), nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 (2) and ammoniacal liquor are raw material, prepare superfine Fe75-Ni25 alloy powder, should finish as follows:

[0021] 1. According to the mass ratio (Fe(NO 3 ) 3 9H 2 O): (Ni(NO 3 ) 2 ·6H 2 (O)=541:114 ratio weighs raw materials, adds deionized water, configures Fe 3+ Concentration is 1.34mol / L, Ni 2+ An aqueous solution with a concentration of 0.43mol / L. This solution is injected into the reaction kettle with a metering pump. According to the ratio of adding 2.44L ammonia water with a concentration of 2mol / L to 1L iron-nickel nitrate solution, inject ammonia water into the reaction kettle through a metering pump, stir it, adjust the pH value of the solution to >8, and react to form iron and nickel hydroxides. precipitation.

[0022] 2. The precipitate is moved into a muffle furnace by suction filtration, and calcined at a temperature of 300°...

Embodiment 2

[0025] Embodiment 2: with anhydrous ferric sulfate (Fe 2 (SO 4 ) 3 ), anhydrous nickel sulfate NiSO 4 And sodium hydroxide (NaOH) is raw material, prepares superfine Fe70-Ni30 alloy powder, should finish as follows:

[0026] 1. According to the mass ratio of Fe 2 (SO 4 ) 3 : NiSO 4 = Ratio of 250:79 Weigh the raw materials, add deionized water, configure as Fe 3+ The concentration is 1.25mol / L, Ni 2+ An aqueous solution with a concentration of 0.51mol / L. This solution is injected into the reaction kettle with a metering pump. According to the ratio of adding 2.39L of sodium hydroxide solution with a concentration of 2mol / L to 1L iron-nickel sulfate solution, inject the sodium hydroxide solution into the reaction kettle through a metering pump, stir, adjust the pH value of the solution>8, and react to form iron, Co-precipitation of nickel hydroxide.

[0027] 2. Filter the precipitate with suction, add deionized water to wash, then filter with suction and wash several...

Embodiment 3

[0031] Embodiment 3: with nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O), cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) and ammonium carbonate ((NH 4 ) 2 CO 3 ·H 2 (2) be raw material, prepare superfine Ni80-Co20 alloy powder, should finish as follows:

[0032] 1. According to the mass ratio (Ni(NO 3 ) 2 ·6H 2 O): (Co(NO 3 ) 2 ·6H 2 O)=4:1 ratio takes raw material, adds deionized water, is configured as Ni 2+ Concentration is 1.36mol / L, Co 2+ An aqueous solution with a concentration of 0.34mol / L. This solution is injected into the reaction kettle by a metering pump. According to the ratio of adding 1L nickel-cobalt solution to 1.75L ammonium carbonate solution with a concentration of 1mol / L, inject the ammonium carbonate solution into the reaction kettle through a metering pump, stir it, adjust the pH value of the solution to >8, and react to form nickel and cobalt carbon. Acid coprecipitation.

[0033] 2. Same as step 2 of Example 1 to obtain nanoscale...

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Abstract

A process for preparing the superfine alloy powder by codeposition-coreduction method includes such steps as liquid-phase codeposition to prepare the precursor powder of each component in alloy, calcining to obtain nano-class composite metallic oxide powder, and reducing by H2 or decomposed ammonia in tubular reducing furnace while alloying to obtain superfine alloy powder.

Description

technical field [0001] The invention belongs to the technical field of metal alloy powder preparation, and in particular provides a co-precipitation-co-reduction method for preparing superfine alloy powder. Background technique [0002] Fe, Co, Ni, Cu, Mo and other powders and their alloy powders, such as: Fe-Ni, Ni-Cu, Fe-Ni-Cu, Ni-Co, Fe-Ni-Mo, etc., are widely used in various fields of powder metallurgy All walks of life. The atomization method is a common method for preparing alloy powders. Its advantage is that alloy powders of various components can be synthesized by smelting. However, the alloy powders prepared by the atomization method are generally coarse in particle size and have poor sintering properties. Some powder metallurgy products need to be sintered at a lower sintering temperature, such as hot-pressed sintered diamond tools. Excessively high sintering temperatures will lead to diamond graphitization, so it is necessary to use alloy powders with a particle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 郭志猛罗骥林涛郝俊杰
Owner UNIV OF SCI & TECH BEIJING
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