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Nanometer nickel powder preparing process

A technology of nano-nickel powder and nickel nitrate, which is applied in the field of powder metallurgy, can solve problems such as no relevant reports, and achieve the effect of preventing segregation and crystallization

Active Publication Date: 2005-07-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The results of the literature survey show that there are no relevant reports at home and abroad on the research on the preparation of nano-nickel powder by freeze-drying technology.

Method used

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Examples

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example 1

[0018] Example 1: Get nickel nitrate [Ni(NO) 2 ·6H 2 O] 50 grams of green crystal powder are dissolved in 100 milliliters of distilled water to obtain a green clear solution; in addition, sodium carbonate [Na 2 CO 3 ] Dissolve 10 grams of the powder in 50 milliliters of distilled water to obtain a colorless and clear solution; after the two solutions are clarified, mix the two to obtain a light green precipitate. After the precipitate was washed 4 times with distilled water, it was dissolved in 90 ml of ammonia water to obtain a dark blue clear solution. Using a nitrogen spray gun with a gun pressure of 5 atm, disperse the clear mixed solution in liquid nitrogen. Then put the frozen material frozen in liquid nitrogen into the FTD Dura-stop MP type freeze dryer of FTS company for vacuum drying. 12°C; the working pressure is 150mtorr and the temperature is -11°C within 2500-3700 minutes; the working pressure is 80mtorr and the temperature is 0°C within 3700-4500 minutes; the...

example 2

[0019] Example 2: Get nickel nitrate [Ni(NO) 2 ·6H 2 O] 50 grams of green crystal powder are dissolved in 100 milliliters of distilled water to obtain a green clear solution; in addition, sodium carbonate [Na 2 CO 3 ] Dissolve 10 grams of the powder in 50 milliliters of distilled water to obtain a colorless and clear solution; after the two solutions are clarified, mix the two to obtain a light green precipitate. After the precipitate was washed 4 times with distilled water, it was dissolved in 90 ml of ammonia water to obtain a dark blue clear solution. Using a nitrogen spray gun with a gun pressure of 4 atm, disperse the clear mixed solution in liquid nitrogen. Then place the frozen material frozen in liquid nitrogen in the FTD Dura-stop MP freeze dryer of FTS Company for vacuum drying. 20°C; the working pressure is 180mtorr and the temperature is -10°C within 2500-3700 minutes; the working pressure is 100mtorr and the temperature is -3°C within 3700-4500 minutes; The w...

example 3

[0020] Example 3: Get nickel nitrate [Ni(NO) 2 ·6H 2 O] 50 grams of green crystal powder are dissolved in 100 milliliters of distilled water to obtain a green clear solution; in addition, sodium carbonate [Na 2 CO 3 ] Dissolve 10 grams of the powder in 50 milliliters of distilled water to obtain a colorless and clear solution; after the two solutions are clarified, mix the two to obtain a light green precipitate. After the precipitate was washed 4 times with distilled water, it was dissolved in 90 ml of ammonia water to obtain a dark blue clear solution. Using a nitrogen spray gun with a gun pressure of 2 atm, disperse the clear mixed solution in liquid nitrogen. Then put the frozen material frozen in liquid nitrogen into the FTD Dura-stop MP type freeze dryer of FTS company for vacuum drying. 15°C; the working pressure is 170mtorr and the temperature is -7°C within 2500-3700 minutes; the working pressure is 90mtorr and the temperature is -1°C within 3700-4500 minutes; Th...

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Abstract

The present invention belongs to the field of powder metallurgical technology, and is freeze drying technology for preparing nanometer nickel powder. The present invention features that the freeze drying process of preparing nanometer nickel powder includes the following steps: mixing nickel nitrate solution and sodium carbonate solution to obtain precipitate, washing and dissolving in ammonia water to obtain clear solution; dispersing the clear solution inside liquid nitrogen with nitrogen spray gun to pre-freeze; vacuum freeze drying the pre-frozen matter in freeze drying machine to obtain precursor; and twice reducing the dried precursor with hydrogen in the flow rate of 0.1-0.3 cu m / hr including the first time at 100-160 deg.c for 1-7 hr and the second time at 140-200 for 2-6 hr. The nanometer nickel powder has wide application foreground in catalyst, sintered activator, conducting slurry, cell, hard alloy and other fields.

Description

technical field [0001] The invention discloses a preparation method of nanometer nickel powder, which belongs to the technical field of powder metallurgy. Background technique [0002] Nickel is a silver-white metal with magnetic properties, electrical conductivity, and good chemical stability, high temperature stability, and mechanical stability. Due to its high surface activity, high surface purity, no microporous penetration, and large specific surface area, nano-nickel powder has great surface effect and volume effect. It is a new, efficient, and highly selective hydrogenation catalyst. Due to its magnetic properties, nano-nickel powder can be used as a magnetic material; in addition, nano-nickel powder has good wettability and good pressing performance and sintering performance for metal carbides (such as WC, TiC, TaC, etc.) and graphite. Therefore, it is an important cemented carbide and diamond matrix bonded metal powder material; nano-nickel powder has good conducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/26
Inventor 聂祚仁席晓丽左铁镛
Owner BEIJING UNIV OF TECH