Method for reducing and preparing nano molybdenum-copper composite powder with low temperature

A composite powder, molybdenum copper technology, applied in the field of powder metallurgy preparation, can solve the problems of high equipment requirements, simple process, complex process, etc., and achieve the effect of short nucleation time, high purity and uniform nucleation

Inactive Publication Date: 2013-02-06
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are corresponding shortcomings. The existing chemical methods include sol-gel method, atomization transformation method, chemical plating method, liquid phase reduction method, etc. These methods require high equipment or relat

Method used

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  • Method for reducing and preparing nano molybdenum-copper composite powder with low temperature
  • Method for reducing and preparing nano molybdenum-copper composite powder with low temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Weigh 12.36g of ammonium paramolybdate and 10.95g of copper nitrate, measure 150ml of concentrated ammonia water (25~28%), configure the aqueous solution of ammonium paramolybdate, the ammonia solution of copper nitrate, mix and add H 2 O is configured as 1L mixed solution.

[0024] (2) Divide the solution prepared in (1) into four equal parts, place them in a microwave oven (700W) for rapid concentration, and obtain molybdenum copper oxide precursor powder.

[0025] (3) Calcining the precursor powder prepared in (2) in air at a calcination temperature of 350° C. and a calcination time of 0.75 h to obtain a molybdenum-copper oxide composite powder.

[0026] (4) The composite powder prepared in (3) was heated in H 2 Insulated at 575°C for 2h to obtain 70Mo-30Cu nano-molybdenum-copper composite powder. See attached figure 1 ,Depend on figure 1 The obtained data was analyzed by Jade to obtain the half peak width, and the average crystal grain size was calculated as...

Embodiment 2

[0028] (1) Weigh 12.36g of ammonium paramolybdate and 6.39g of copper nitrate, measure 100ml of concentrated ammonia water (25~28%), configure the aqueous solution of ammonium paramolybdate, the ammonia solution of copper nitrate, mix and add H 2 O is configured as 1L mixed solution.

[0029] (2) Divide the solution obtained in (1) into five equal parts, place it in a microwave oven (700W) for rapid concentration, and obtain a molybdenum-copper oxide precursor powder.

[0030] (3) Calcining the precursor powder prepared in (2) in air at a calcination temperature of 350° C. and a calcination time of 0.75 h to obtain a molybdenum-copper oxide composite powder.

[0031] (4) The composite powder prepared in (3) was heated in H 2 Insulated at 575°C for 2h to obtain 80Mo-20Cu nano-molybdenum-copper composite powder.

Embodiment 3

[0033] (1) Weigh 17.96g of ammonium paramolybdate and 20g of copper nitrate, measure 500ml of concentrated ammonia water (25~28%), configure the aqueous solution of ammonium paramolybdate, the ammonia solution of copper nitrate, mix and add H 2 O is configured as 1L mixed solution.

[0034] (2) Divide the solution prepared in (1) into four equal parts, place them in a microwave oven (700W) for rapid concentration, and obtain molybdenum copper oxide precursor powder.

[0035] (3) The precursor powder prepared in (2) was calcined in air at a calcination temperature of 400° C. and a calcination time of 0.5 h to obtain a molybdenum-copper oxide composite powder.

[0036] (4) The composite powder prepared in (3) was heated in H 2 Insulated at 600°C for 2h to obtain 65Mo-35Cu nano-molybdenum-copper composite powder.

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Abstract

A method for reducing and preparing nano molybdenum-copper composite powder with low temperature comprises two steps: step 1, preparing molybdenum-copper oxide precursor, and step 2, preparing nano molybdenum-copper composite powder. In step 1, a water solution of molybdenum salt and an ammonia water solution of copper salt are mixed, the mixed solution is heated through micro-wave heating for fast concentration, and resolvents are removed to obtain molybdenum-copper oxide precursor powder; and in step 2, molybdenum-copper oxide precursor powder is heated to be 325 to 400 DEG C, calcined, taken out of a stove, cooled by air, and then heated to 525 to 625 DEG C for reducing after being placed in an H2 atmosphere, so as to obtain nano molybdenum-copper composite powder. The nano molybdenum-copper composite powder prepared according to the method has the advantages that the specific surface area is large; the crystal grains are fine and the purity is high. As molybdenum-copper oxide precursor powder is prepared by combining a simple and effective liquid phase chemical method with micro-wave heating, and nano molybdenum-copper composite powder is prepared through calcining and reducing, the method provided by the invention is simple and fast; the process is easy to control; the powder yield is large; the efficiency is high; the reducing temperature of powder is greatly reduced; and suitability for industrialized mass production is realized.

Description

technical field [0001] The invention discloses a method for preparing nano-molybdenum-copper composite powder through low-temperature reduction, and belongs to the technical field of powder metallurgy preparation. Background technique [0002] Molybdenum-copper composite material is a pseudo-alloy, which combines the high melting point and high strength of molybdenum with the high plasticity and high conductivity of copper, and has good comprehensive properties. Molybdenum-copper materials were mainly used as electrical contacts of high-voltage switches in the past, and have been widely used in aerospace and weapon industries in recent years. [0003] Traditional molybdenum-copper materials are prepared by infiltration sintering and simple liquid phase sintering, but both have shortcomings such as composition segregation and low relative density, which seriously affect the advantages of molybdenum-copper materials. Using powder metallurgy to sinter nano-molybdenum-copper co...

Claims

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Application Information

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IPC IPC(8): B22F9/22C22C1/04C22C27/04
Inventor 王德志李燎涣孙翱魁董小嘉段柏华李翼
Owner CENT SOUTH UNIV
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