Unlock instant, AI-driven research and patent intelligence for your innovation.

Process for preparing nano grade super fine cobalt powder

An ultra-fine cobalt powder, nano-scale technology, applied in cobalt oxide/cobalt hydroxide and other directions, can solve the problems of high production cost, coarse average particle size, large equipment investment, etc., to solve the problem of difficult precipitation separation, narrow particle size distribution, simple craftsmanship

Inactive Publication Date: 2005-03-02
UNIV OF SCI & TECH BEIJING
View PDF0 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the first three methods can produce nano-scale cobalt powder with an average particle size of ≤100nm, the production cost is too high and the production efficiency is very low, so that large-scale industrial production cannot be carried out for a long time. The average particle size of cobalt powder produced by vapor deposition method is Coarse, generally 0.1-1.5μm, and the investment in equipment is large, and the production efficiency is low. Evaporation and condensation method can produce cobalt powder with a thickness of 0.1-3μm, which requires a large investment in equipment and low production efficiency.
The original ancient process of preparing cobalt powder, although it can produce cobalt powder in large quantities, the average particle size of the powder is relatively coarse (0.8-2μm), which is far from meeting the needs of scientific research and new product development of ultra-fine grained cemented carbide , the purpose of the patent of the present invention is to provide a cobalt oxide powder which is directly prepared by the ultrasonic spray heat transfer method and is ultra-fine (average particle size ≤ 60nm) cobalt oxide powder. 2 Reduction, a preparation technology that can directly make nano-cobalt powder

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for preparing nano grade super fine cobalt powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: To prepare 1 kg of nano-cobalt powder, it should be completed according to the following steps.

[0039] 1. Weighing:

[0040] Weigh 4938.32 grams of Co(NO 3 ) 2 ·6H 2 Add the O crystal powder into 4 liters of distilled water, stir continuously, and filter the foreign impurities with a 44 μm sieve after completely dissolving, then transfer the solution into the atomizing liquid tank.

[0041] 2. Air flow ultrasonic spray heat conversion:

[0042] Use circular seam resonant airflow ultrasonic atomizing nozzle with spray angle α=45°, spray pressure (air) 2.5MPa, hot air temperature 128°C, airflow spray speed 2 Mach number, liquid delivery speed 200ml / min, the solution is completely atomized After completion, the dry precursor powder can be obtained and transferred to the calcination stage.

[0043] 3. Roasting:

[0044] The precursor powder is roasted in a roasting furnace at 450°C and 50 minutes of air atmosphere to further decompose and remove the re...

Embodiment 2

[0057] Example 2 To prepare 10kg of nano-cobalt powder, it should be completed according to the following steps.

[0058] 1. Weighing

[0059] Weigh 49.384kg Co(NO 3 ) 2 ·6H 2 O crystal powder is added to 40 liters of distilled water in a stainless steel solution tank. After stirring continuously to dissolve completely, the solution is injected into the liquid tank of the atomization tower by a liquid pump through a 44 μm screen filter pipeline for spray heat conversion.

[0060] 2. Airflow spray heat conversion

[0061] Use circular slot resonant airflow ultrasonic atomizing nozzle with spray angle α=45°, spray pressure (air) 3.5MPa, hot air temperature 68°C, liquid flow delivery speed 200ml / min, airflow injection speed 2.5 Mach number, the solution is completely atomized After completion, the dry precursor powder can be obtained and transferred to the roasting process.

[0062] 3. Roasting

[0063] Put the precursor powder obtained in the above 2 directly into the roas...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The preparation process of nano level superfine cobalt powder includes ultrasonic gas flow spraying and converting process to prepare precursor CoOx powder of average size below 60 nm, roasting, shearing to crush, centrifuging, air drying, low temperature H2 reduction at 520-550 deg.c in tube furnace to prepare nano level Co powder of average size below 80 nm. The present invention has the advantages of simple technological process, low cost, capacity of being mass produced in reducing furnace, narrow Co powder size distribution range, and spherical particle in the average size below 80 nm.

Description

technical field [0001] The invention belongs to the technical field of preparation of metal powder in metal materials, and in particular provides a preparation method of nano-scale ultrafine cobalt powder, which is suitable for industrial production of nano-scale cobalt powder. Background technique [0002] Metal cobalt is widely used in the fields of superalloy materials, hard alloy materials, functional materials, wear-resistant alloy materials, chemical catalyst-catalyst materials, diamond tool materials, etc. The industries and technical fields directly applied by these materials are the national economy The most important sectors in the industry, such as aerospace engines, gas turbine generators, heavy artillery equipment, transportation, tunnels, petroleum, coal mines, etc., require a large amount of cobalt metal. [0003] The cemented carbide industry is almost the basic industry of all industries. In this industry alone, my country needs about 700 tons of cobalt powd...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B22F9/22C01G51/04
Inventor 吴成义张丽英
Owner UNIV OF SCI & TECH BEIJING