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
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  • Summary
  • Abstract
  • Description
  • Claims
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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 product...

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

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Experimental program
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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...

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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

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Application Information

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IPC IPC(8): B22F9/20B82Y40/00
Inventor 羊建高戴煜谭兴龙
Owner ADVANCED FOR MATERIALS & EQUIP
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