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Method for preparing nanometer WC powder in conditions of low temperature and short process

A short process, powder technology, applied in the direction of tungsten/molybdenum carbide, carbide, etc., can solve the problems of harsh environment, fine particle size of W powder, easy growth of W powder, etc., to achieve narrow particle size distribution and fine grain size. , The effect of powder composition is easy to control

Active Publication Date: 2018-08-28
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Production of WO due to APT calcination-reduction 2.72 Strict requirements on equipment and environment, improper control, easy to generate WO 3 、WO 2.9 、WO 2.72 、WO 2 complex, and WO 2.72 The particle size of the reduced W powder is relatively fine, it is easy to oxidize and spontaneously combust, and the W powder is easy to grow if the reduction is not properly controlled.
At the same time, during the carbonization process, W powder and lighter carbon black tend to mix unevenly, and reductive carbonization tends to cause component segregation

Method used

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  • Method for preparing nanometer WC powder in conditions of low temperature and short process
  • Method for preparing nanometer WC powder in conditions of low temperature and short process
  • Method for preparing nanometer WC powder in conditions of low temperature and short process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The present embodiment prepares nano WC powder according to the following steps:

[0033] 1) Ingredients

[0034] Dissolve 100Kg of water-soluble ammonium metatungstate, 54Kg of glucose, 0.6Kg of ammonium metavanadate and 0.9Kg of ammonium dichromate in pure water whose mass is 1.0 times the total mass of solids, and stir evenly at 80°C to obtain a mixture with pH=4. slurry;

[0035] 2) spray drying

[0036] The mixed slurry obtained in step 1) is subjected to centrifugal spray drying to obtain a spherical precursor composite powder. The conditions of the centrifugal spray drying are: the inlet air temperature is 260°C, the outlet air temperature is 140°C, and the atomizer speed is 15000r / min, feed rate 3.4kg / min;

[0037] 3) Calcination

[0038] The spherical precursor composite powder obtained in step 2) was calcined at 600°C for 60 minutes with nitrogen gas, and then the spherical shell was broken by dry ball milling to obtain carbon-coated nano WO 3 powder;

...

Embodiment 2

[0043] The present embodiment prepares nano WC powder according to the following steps:

[0044] 1) Ingredients

[0045]Dissolve 100Kg of water-soluble ammonium metatungstate, 49Kg of glucose, 0.4Kg of ammonium metavanadate and 0.8Kg of ammonium dichromate in pure water whose mass is 0.6 times the total mass of solids, and stir evenly at 60°C to obtain a mixture with pH=3.2 slurry;

[0046] 2) spray drying

[0047] The mixed slurry obtained in step 1) is subjected to centrifugal spray drying to obtain precursor composite powder. The conditions of the centrifugal spray drying are: the inlet air temperature is 260°C, the outlet air temperature is 120°C, and the rotation speed of the atomizer is 12000r / min, feed rate 3.0kg / min;

[0048] Scanning electron microscope analysis is carried out to the composite powder of precursor obtained in this embodiment, the result is as follows figure 2 As shown, it can be seen that the obtained precursor composite powder has a spherical st...

Embodiment 3

[0060] The present embodiment prepares nano WC powder according to the following steps:

[0061] 1) Ingredients

[0062] Dissolve 100Kg of water-soluble ammonium metatungstate, 46Kg of glucose, 0.3Kg of ammonium metavanadate and 0.9Kg of ammonium dichromate in pure water whose mass is 0.8 times the total mass of the solid, and stir evenly at =70°C to obtain pH=3.4 mixed slurry;

[0063] 2) spray drying

[0064] The mixed slurry obtained in step 1) is subjected to centrifugal spray drying to obtain spherical precursor composite powder. The conditions of the centrifugal spray drying are: the inlet air temperature is 260°C, the outlet air temperature is 115°C, and the atomizer speed is 10000r / min, feed rate 2.8kg / min;

[0065] 3) Calcination

[0066] The spherical precursor composite powder obtained in step 2) was calcined at 500°C for 80 minutes with nitrogen gas, and then the spherical shell was broken by dry ball milling to obtain carbon-coated nano WO 3 powder;

[0067...

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Abstract

The invention discloses a method for preparing nanometer WC powder in conditions of low temperature and short process. The method comprises the following steps: taking water soluble ammonium metatungsten and glucose as raw materials, adding ammonium dichromate and ammonium metavanadate which are taken as inhibitors, adding the raw materials and the inhibitors into pure water, heating and uniformlystirring, and performing spray drying, calcinations and reduction carbonation processes, so as to obtain a target product the nanometer WC powder. The nanometer WC powder is stable in performance, single in phase, uniform in components, narrow in grain fineness distribution, fine in crystal particles, and easy in powder component control, and has industrial and mass production capacity.

Description

technical field [0001] The invention belongs to a method for preparing raw material powder used in the production of nano / ultrafine cemented carbide, in particular to a method for preparing nano tungsten carbide (WC) powder using a water-soluble method, low temperature and short process. The nano WC powder prepared by the method can be applied to dot-matrix printer drills, micro-drills for integrated circuit boards, high-precision CNC machining drills and milling cutters, medical dental drills, cutting tools for difficult-to-machine materials, and the like. Background technique [0002] With the continuous development of modern processing materials to high-end aluminum alloys, titanium alloys, magnesium alloys, high-performance copper alloys, stainless steel, amorphous materials and the emergence and application of various difficult-to-machine materials, accompanied by advanced manufacturing systems, high-speed cutting, super The development of precision machining and green ...

Claims

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Application Information

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IPC IPC(8): C01B32/949
CPCC01P2002/72C01P2004/03C01P2004/61C01P2006/10C01P2006/12
Inventor 朱二涛张久兴杨新宇
Owner HEFEI UNIV OF TECH
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