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Method for manufacturing nanometer tungsten/cobalt carbide composite powder

A nano-tungsten carbide and composite powder technology, applied in nanotechnology and other directions, can solve the problems of difficult control of carbon content of composite powder, easy aggregation and growth of particles, etc., so as to improve the surface tension of droplets, increase solution viscosity, and reduce processing and production costs. Effect

Active Publication Date: 2013-04-24
ADVANCED FOR MATERIALS & EQUIP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0015] This method uses a hydrogen atmosphere and carbon powder mixed ball mill in the reduction carbonization process, making it difficult to control the carbon content of the prepared composite powder
And in this process, there are tungsten oxide and cobalt oxide, so hydrates will be generated in the redox reaction, and eventually the particles will easily aggregate and grow

Method used

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  • Method for manufacturing nanometer tungsten/cobalt carbide composite powder

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0040] Step 1: Mix 55kg of ammonium metatungstate (AMT), 40kg of Co(NO3) 2 , 3kg of polyethylene glycol (PEG) and 2kg of water-soluble vanadium salt are dissolved in 300kg of water to prepare a mixed aqueous solution;

[0041] Step 2: Add 1 kg of carbon nanotubes (CNTs) to the mixed aqueous solution obtained in Step 1, and stir at a rate of 10 rpm for 30 minutes to make it evenly mixed;

[0042] Step 3: The mixed aqueous solution obtained in step 2 is subjected to rapid low-temperature spray drying, the inlet temperature of the low-temperature drying is 150°C, and the outlet temperature is only 70°C, so that ultrafine tungsten-cobalt composite salt precursor powder can be obtained;

[0043] Step 4: The precursor powder obtained in step 3 is subjected to reduction synthesis and carbon adjustment at a temperature of 900° C. to prepare a tungsten carbide / cobalt composite powder material with a nanostructure.

[0044] The average grain size of the tungsten carbide / cobalt composit...

example 2

[0046] Step 1: Dissolve 92kg of ammonium paratungstate (APT), 3kg of cobalt oxalate, 3kg of polyvinyl alcohol (PVA) and 2kg of water-soluble vanadium salt in 400kg of water to prepare a mixed aqueous solution;

[0047] Step 2: Add 3 kg of carbon nanotubes (CNTs) to the mixed aqueous solution obtained in Step 1, and stir at a speed of 20 rpm for 40 minutes to make it evenly mixed;

[0048] Step 3: The mixed aqueous solution obtained in step 2 is subjected to rapid low-temperature spray drying, the inlet temperature of the low-temperature drying is 200°C, and the outlet temperature is only 90°C, so that ultrafine tungsten-cobalt composite salt precursor powder can be obtained;

[0049] Step 4: The precursor powder obtained in step 3 is subjected to reduction synthesis and carbon adjustment at a temperature of 900° C. to prepare a tungsten carbide / cobalt composite powder material with a nanostructure.

[0050] The average grain size of the tungsten carbide / cobalt composite powder...

example 3

[0052] Step 1: Mix 62kg of ammonium paratungstate (APT), 30kg of CoCl 2 1. Dissolve 6kg of starch and 2kg of water-soluble chromium salt in 500kg of water to prepare a mixed aqueous solution;

[0053] Step 2: Add 8 kg of carbon nanotubes (CNTs) to the mixed aqueous solution obtained in Step 1, and stir at a speed of 30 rpm for 60 minutes so that it can be mixed evenly;

[0054] Step 3: The mixed aqueous solution obtained in step 2 is subjected to rapid low-temperature spray drying, the inlet temperature of the low-temperature drying is 180°C, and the outlet temperature is only 80°C, so that ultrafine tungsten-cobalt composite salt precursor powder can be obtained;

[0055] Step 4: The precursor powder obtained in step 3 is subjected to reduction synthesis and carbon adjustment at a temperature of 1000° C. to prepare a tungsten carbide / cobalt composite powder material with a nanostructure.

[0056] Through Example 3, the average grain size of the tungsten carbide / cobalt compos...

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Abstract

The invention discloses a method for manufacturing nanometer tungsten / cobalt carbide composite powder. The method is characterized by comprising technological steps of firstly, dissolving, by mass, 55-92% of water-soluble tungsten salt, 3-40% of water-soluble cobalt salt, 3-6% of water-soluble carburizing and nodulizing agents and 0.1-2% of water-soluble composite grain growth inhibitors into water with the mass 3-5 times that of a mixture of the water-soluble tungsten salt, the water-soluble cobalt salt, the water-soluble carburizing and nodulizing agents and the water-soluble composite grain growth inhibitors to prepare mixed aqueous solution; secondly, adding carbon nano-tubes (CNT) accounting for 1-10% of the total mass of the aqueous solution into the mixed aqueous solution obtained in the first step and enabling the carbon nano-tubes to be uniformly mixed in the mixed aqueous solution; thirdly, performing quick low-temperature spray drying for mixed aqueous solution obtained in the second step to obtain precursor powder of ultrafine tungsten and cobalt composite salt; and fourthly, performing reduction synthesis and carbon conditioning at the temperature ranging from 900 DEG C to 1000 DEG C for the precursor powder obtained in the third step to prepare tungsten / cobalt carbide composite powder materials with nanostructures.

Description

technical field [0001] The invention relates to a preparation process of a nanostructured tungsten carbide / cobalt composite powder, in particular to a large-scale industrial preparation of a multipurpose nanostructured tungsten carbide / cobalt composite powder, which is mainly used in the preparation of ultrafine nanometer powders, Especially in the field of preparation technology and method of nano-tungsten-based composite powder series materials. Background technique [0002] Refractory metal tungsten alloy has a series of excellent physical and mechanical properties, and has a very wide range of uses in the fields of national defense, aerospace, electronic information, energy, metallurgy and machining industries, and occupies an important position in the national economy. W-Co cemented carbide has high hardness, strength and good wear resistance. It is a hard material second only to diamond. It is widely used as cutting tools and is called "teeth of modern industry". Ther...

Claims

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Application Information

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IPC IPC(8): B22F9/22B82Y40/00
Inventor 戴煜谭兴龙邓军旺
Owner ADVANCED FOR MATERIALS & EQUIP
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