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Method for manufacturing tungsten/ cobalt carbide composite powder with nanostructure

A composite powder and nanostructure technology, which is applied in the field of preparation of nanostructured WC/Co composite powder, can solve the problem that it is difficult to control the grain size and particle size distribution of WC, reduce, increase the amount of carbonized gas, and it is difficult to evenly distribute the two phases. Compound powder and other problems, to achieve the effect of uniform product particle size distribution, narrow particle size distribution range, and safe and reliable product performance

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

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Problems solved by technology

However, there are many problems in this method: it is difficult to obtain a composite powder with uniform distribution of two phases by simple ball milling. In addition, because the mechanical force of ball milling is not enough to refine the particles to the nanometer level, it is necessary to prepare a nanostructured powder. Body is hard
This method has been greatly improved compared with conventional methods, but there are still some problems: in the process of fluidized gas phase reduction of precursor powder, the carbonization time is too long or even exceeds 10 hours, so it is difficult to control WC The grain size and particle size distribution; and the use of reducing and carbonizing gases will greatly increase, which will also increase production costs and energy consumption

Method used

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  • Method for manufacturing tungsten/ cobalt carbide composite powder with nanostructure

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Experimental program
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Effect test

example 1

[0030] Step 1: Mix 55kg ammonium metatungstate (AMT), 40kg Co(NO 3 ) 2 , 3kg of starch and 2kg of water-soluble compound grain growth inhibitor are dissolved in 300kg of water to prepare a mixed aqueous solution;

[0031] Step 2: performing rapid crystallization of the mixed aqueous solution obtained in step 1;

[0032] Step 3: pretreating the crystals obtained in step 2, the pretreatment temperature is 500°C, to obtain spherical powder;

[0033]Step 4: The powder material obtained after step 3 needs to undergo reduction synthesis and carbon adjustment at a temperature of 900°C to prepare a tungsten carbide / cobalt composite powder material with a nanostructure.

[0034] The ultrafine nanostructure tungsten carbide / cobalt composite powder material produced by the process of Example 1 has a narrow particle size distribution range, good uniformity, and an average grain size ≤ 80nm.

example 2

[0036] Step 1: Dissolve 92kg of ammonium paratungstate (APT), 3kg of cobalt oxalate, 4kg of sugar and 1kg of water-soluble chromium salt in 400kg of water to prepare a mixed aqueous solution;

[0037] Step 2: performing rapid crystallization on the mixed aqueous solution obtained in step 1; using the solution high-pressure spray rapid crystallization method to realize the nanometerization of powder crystal grains;

[0038] Step 3: pretreat the crystals obtained in step 2 at a pretreatment temperature of 700°C to obtain spherical powder; the water-soluble carburizing nodulizing agent will produce obvious foaming after pyrolysis between 250-300°C. According to the process characteristics, the process of passing through the foaming temperature point at a slow speed is adopted, so in step 3, when the heating temperature is below 300°C, the heating rate is 1-5°C / min, and when the heating temperature is above 300°C, the heating rate is 5°C / min. ~10°C / min. In order to realize the ab...

example 3

[0042] Step 1: Mix 56kg ammonium paratungstate (APT), 40kgCoCl 2 , 3.9kg of polyethylene glycol (PEG) and 0.1kg of water-soluble vanadium salt are dissolved in 500kg of water to prepare a mixed aqueous solution;

[0043] Step 2: performing rapid crystallization of the mixed aqueous solution obtained in step 1;

[0044] Step 3: pretreating the crystals obtained in step 2, the pretreatment temperature is 500°C, to obtain spherical powder;

[0045] Step 4: The powder material obtained after step 3 needs to undergo reduction synthesis and carbon adjustment at a temperature of 950°C to prepare a tungsten carbide / cobalt composite powder material with a nanostructure.

[0046] In order to obtain a better process effect, after the pretreatment stage, complete tungsten carbide crystals are not formed, and there are still a large amount of free carbon, which requires reduction synthesis and carbon adjustment at a higher temperature to prepare nanostructured tungsten carbide. Tungsten ...

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Abstract

The invention discloses a method for manufacturing tungsten / cobalt carbide composite powder with a nanostructure. The method includes 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, quickly crystallizing the mixed aqueous solution obtained in the first step; thirdly, pre-treating crystalline, which is obtained in the second step, at the pretreatment temperature ranging from 500 DEG C to 700 DEG C to obtain nodular powder; and fourthly, performing reduction synthesis and carbon conditioning for powder materials, which are obtained in the third step, at the temperature ranging from 900 DEG C to 1000 DEG C to manufacture tungsten / cobalt carbide composite powder materials with nanostructures. The method has the advantages that a process is simple, and the hard alloy powder materials with the nanostructures can be produced in an industrialized manner.

Description

technical field [0001] The present invention relates to the technical field of preparation of nanostructured WC / Co composite powder, in particular to the industrialized preparation of ultrafine nano WC / Co composite powder, which is mainly used for ultrafine nanometer powder, especially nanometer tungsten-based composite powder preparation of bulk materials. Background technique [0002] The emergence of ultrafine cemented carbide powder has brought epoch-making significant technological changes to the field of cemented carbide materials. The world's cemented carbide production enterprises attach great importance to the research and development of ultrafine cemented carbide powder related technologies, and strive to occupy a favorable position in the new round of competition. Among them, the high-quality raw material powder with finer and more uniform particle size, higher powder purity and better stability is the key to the production of high-performance ultra-fine cemented...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24C22C29/08C22C1/04
Inventor 戴煜谭兴龙邓军旺
Owner ADVANCED FOR MATERIALS & EQUIP
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