Method for preparing nanometer WC-Co composite powder through high-temperature spray drying short process

A composite powder, spray drying tower technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the quality control of WC-Co composite powder, precursor powder easy to absorb moisture gelatinization, Reduce the service life of equipment and other problems, and achieve the effect of easy control of powder composition, fine grain size, and improved quality

Active Publication Date: 2019-02-22
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of open spray drying-calcination preparation has the following problems: the precursor powder is easy to absorb moisture and gelatinize; the material is easy to stick to the material box during the calcination process; the precursor powder is easy to form a foamy structure oxide during the calcination process; the precursor calcination process The volatiles in the medium will corrode the equipment to a certain extent

Method used

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  • Method for preparing nanometer WC-Co composite powder through high-temperature spray drying short process
  • Method for preparing nanometer WC-Co composite powder through high-temperature spray drying short process
  • Method for preparing nanometer WC-Co composite powder through high-temperature spray drying short process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Configure the mixed slurry: configure the WC-6Co composite powder according to the Co content of 6wt%, and mix the water-soluble cobalt acetate with a mass fraction of 11.56wt%, the water-soluble ammonium metatungstate with a mass fraction of 57.35wt%, and the water-soluble ammonium metatungstate with a mass fraction of 31.09wt%. Glucose is put into pure water heated to 75 ° C in order, accounting for 2 / 3 of the storage tank volume (pure water is calculated on the basis of 40 wt% of the total weight of the material), mixed, heated and stirred for 2 hours, and the viscosity of the resulting mixed slurry is 5000 ± 500mPa.s, pH=4±0.5;

[0039] 2) Spray drying crystallization: the mixed slurry obtained in step 1) is transported to a closed centrifugal high-temperature spray drying tower by a material pump for drying, and nitrogen gas is introduced into the closed centrifugal spray drying tower, and the pressure inside the tower is controlled at 2.4±0.1Kpa , the inlet tem...

Embodiment 2

[0052] 1) Configure the mixed slurry: configure the WC-6Co composite powder according to the Co content of 6wt%, and mix the water-soluble cobalt acetate with a mass fraction of 11.56wt%, the water-soluble ammonium metatungstate with a mass fraction of 56.45wt%, and the water-soluble carbon with a mass fraction of 31.99wt%. source (51.5% glucose + 48.5% citric acid), put them into pure water heated to 75°C in order, accounting for 2 / 3 of the storage tank volume (pure water is calculated as 40wt% of the total weight of the material), mixed and heated for 2 hours, and the obtained mixture The viscosity of the slurry is 4000±500mPa.s, pH=4±0.5;

[0053] 2) Spray drying crystallization: the mixed slurry obtained in step 1) is transported to a closed centrifugal high-temperature spray drying tower by a material pump for drying, and nitrogen gas is passed into the closed centrifugal spray drying tower, and the pressure inside the tower is controlled at 2.5 ± 0.1Kpa , the inlet tempe...

Embodiment 3

[0060] 1) Configure the mixed slurry: configure the WC-6Co composite powder according to the Co content of 6wt%, and mix the water-soluble basic cobalt carbonate with a mass fraction of 5.6wt%, the water-soluble ammonium metatungstate with a mass fraction of 60.07wt%, and the water-soluble ammonium metatungstate with a mass fraction of 34.33wt%. Glucose, which is stable, is put into pure water heated to 85°C in order, accounting for 2 / 3 of the storage tank volume (pure water is calculated as 40wt% of the total weight of the material), mixed and heated for 2 hours, and the viscosity of the obtained mixed slurry is 6000 ± 500mPa. s, pH=4.5±0.5;

[0061] 2) Spray drying crystallization: the mixed slurry obtained in step 1) is transported to a closed centrifugal high-temperature spray drying tower by a material pump for drying, and nitrogen gas is passed into the closed centrifugal spray drying tower, and the pressure inside the tower is controlled at 2.5 ± 0.1Kpa , the inlet temp...

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Abstract

The invention discloses a method for preparing nanometer WC-Co composite powder through high-temperature spray drying short process. The method comprises the steps that water-soluble ammonium metatungstate, water-soluble cobalt salt and a water-soluble carbon source serve as a raw material; the raw material is added to a heated and stirred container containing pure water to be prepared into slurry; the slurry is delivered to a closed type centrifugal high-temperature spray drying tower of which nitrogen is introduced through a feed pump to be dried; the spray dried precursor material is crushed and screened and then is subjected to reduction and carbonization; the reduced and carbonized material is crushed and screened through air flow and finally is blended to obtain the WC-Co composite powder. The nanometer WC-Co composite powder prepared through the method is stable in property, single in phase, uniform in ingredient, narrow grain size distribution and fine in grain, powder ingredients are controlled easily, and the method belongs to the process through which industrialized and mass production can be achieved.

Description

technical field [0001] The invention belongs to a method for preparing raw material powder used in ultrafine cemented carbide production, which is a method for preparing nanometer WC-Co composite powder by adopting water-soluble method, high-temperature spray drying, carbothermal in-situ reduction reaction and short process. The nano-WC-Co composite powder prepared by this method can be used to prepare ultra-fine cemented carbide, which can be applied to dot matrix printer drills, integrated circuit board micro-drills, high-precision CNC machining drills and milling cutters, medical dental drills, and cutting tools for difficult-to-machine materials. Background technique [0002] In order to meet the requirements of highly integrated, light and thin, miniaturized, crash-resistant, electromagnetic shielding, heat dissipation and other requirements of 3C products, at the same time, the number of layers of the main board (PCB) of 3C products is increasing, and the diameter of PC...

Claims

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Application Information

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IPC IPC(8): B22F9/22B22F9/04B22F1/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/04B22F9/22B22F1/054
Inventor 张久兴朱二涛杨新宇潘亚飞
Owner HEFEI UNIV OF TECH
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