Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing spherical nanostructure tungsten/cobalt carbide compound powder

A nanostructure and composite powder technology, applied in the direction of nanotechnology, can solve the problems of increased gas consumption and energy consumption, reduced product performance, increased production costs, etc., to prevent excessive growth of grains, reduce processing and production costs, The effect of increasing the viscosity of the solution

Active Publication Date: 2013-04-24
ADVANCED FOR MATERIALS & EQUIP
View PDF6 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] ① During the carbonization process, a sufficient amount of CH is introduced 4 or CO / CO 2 Atmospheric gas with equal carbon potential undergoes gas-solid surface reaction to introduce carbon atoms. Such a long-distance gas diffusion process will inevitably take more time and require more atmospheric gas with carbon potential, which will slow down the reaction rate and greatly increase Cost of production
[0016] ② The prepared nano-tungsten carbide / cobalt composite powder is easily oxidized due to exposure to air, thereby reducing product performance
[0017] ③ Using a fluidized bed for reduction carbonization reaction will greatly increase the gas consumption and energy consumption participating in the reaction, and the reaction time is long, the reaction efficiency is low, and the production cost is also increased

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
  • Method for preparing spherical nanostructure tungsten/cobalt carbide compound powder

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0045] Step 1: The starting material is the waste tungsten carbide / cobalt material in the production process or after use. The starting material is exposed to an oxygen-containing atmosphere and fired at a temperature of 850°C to clean the surface of the starting material The clean waste residue raw materials can be fully oxidized; the oxidized waste tungsten carbide / cobalt is further crushed, and the precursor powder of tungsten-cobalt composite oxide is obtained after oxidation and crushing;

[0046] Step 2: select 95kg of the precursor powder obtained in step 1, dissolve 3kg of starch and 2kg of water-soluble chromium salt in water with a quality of 300kg, and prepare a mixed aqueous solution;

[0047] Step 3: The mixed aqueous solution of step 2 must be subjected to rapid spray drying to obtain ultrafine compound salt powder;

[0048] Step 4: The powder material obtained after step 3 needs to undergo reduction synthesis and carbon adjustment at a temperature of 900°C to pr...

example 2

[0051] Step 1: The starting material is the waste tungsten carbide / cobalt material in the production process or after use. The starting material is exposed to an oxygen-containing atmosphere and fired at a temperature of 880°C to clean the surface of the starting material The clean waste residue raw materials can be fully oxidized; the oxidized waste tungsten carbide / cobalt is further crushed, and the precursor powder of tungsten-cobalt composite oxide is obtained after oxidation and crushing;

[0052] Step 2: select the precursor powder obtained in step 1 with a mass fraction of 93kg, dissolve 6kg of sugar and 1kg of water-soluble vanadium salt in water with a quality of 400kg, and prepare a mixed aqueous solution;

[0053] Step 3: The mixed aqueous solution of step 2 must be subjected to rapid spray drying to obtain ultrafine compound salt powder;

[0054] Step 4: The powder material obtained after step 3 needs to undergo reduction synthesis and carbon adjustment at a temper...

example 3

[0057] Step 1: The starting material is the waste tungsten carbide / cobalt material in the production process or after use. The starting material is exposed to an oxygen-containing atmosphere and fired at a temperature of 900°C to clean the surface of the starting material The clean waste residue raw materials can be fully oxidized; the oxidized waste tungsten carbide / cobalt is further crushed, and the precursor powder of tungsten-cobalt composite oxide is obtained after oxidation and crushing;

[0058] Step 2: 93.9 kg of the precursor powder obtained in step 1, 6 kg of polyethylene glycol (PEG) and 0.1 kg of water-soluble chromium salt were dissolved in 300 kg of water to prepare a mixed aqueous solution;

[0059] Step 3: The mixed aqueous solution of step 2 must be subjected to rapid spray drying to obtain ultrafine compound salt powder;

[0060] Step 4: The powder material obtained after step 3 needs to undergo reduction synthesis and carbon adjustment at a temperature of 95...

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

PropertyMeasurementUnit
Grain sizeaaaaaaaaaa
Grain sizeaaaaaaaaaa
Grain sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing spherical nanostructure tungsten / cobalt carbide compound powder by waste hard alloy. The method is characterized by including the steps of firstly, oxidizing and crushing waste tungsten / cobalt carbide material to obtain tungsten / cobalt compound oxide powder; secondly, dissolving 93-96% of the tungsten / cobalt compound oxide powder obtained in the step 1, 3-6% of water-soluble carburization spheroidizing agent and 0.1-2% of water-soluble compound grain growth inhibitor in water with 3-5 times of mass to obtain mixed water solution; thirdly, subjecting the mixed water solution obtained in the step 2 to fast spray-drying to obtain intermediate with evenly distributed components; and fourthly, subjecting the intermediate obtained in the step 3 to reduction, synthesis and carbon regulation at 900-1000 DEG C to obtain the nanostructure spherical tungsten / cobalt carbide compound powder.

Description

technical field [0001] The invention relates to a method for preparing a spherical nanostructure tungsten carbide / cobalt composite powder, in particular to a method for preparing a spherical nanostructure tungsten carbide / cobalt composite powder by utilizing waste cemented carbide in industry. Background technique [0002] WC-Co cemented carbide with nanostructure ultrafine grains has excellent performance of high hardness and high strength. It can be mainly used to make micro-drills for integrated circuit boards, dot matrix printers, printing needles, overall hole processing tools, woodworking tools, Precision tooling, cutting tools for difficult-to-machine materials, etc. The finer the grains of WC-based cemented carbide, the fewer defects, and the smaller the average free path of the bonding phase such as Co phase, the higher the bending strength and hardness of the material; and when other conditions are the same, the WC-based hard alloy Various properties of hard alloy...

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): B22F9/20B82Y40/00
Inventor 羊建高戴煜谭兴龙
Owner ADVANCED FOR MATERIALS & EQUIP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com