A method for preparing nano-wc-co composite powder by high temperature spray drying and short process

A technology of composite powder and spray drying tower, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the quality control of WC-Co composite powder, the precursor powder is easy to absorb moisture and gelatinize, Reduce the service life of equipment and other issues, and achieve the effect of avoiding moisture absorption, gelatinization, oxidation and water absorption, and material combustion

Active Publication Date: 2022-02-11
HEFEI UNIV OF TECH
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  • 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 and reduce the service life of the equipment
[0005] At present, there is no method of using high-temperature spray drying, closed centrifugal spray drying tower, and nitrogen gas to prepare precursor powder, and there is no method to control the quality in the production process of WC-Co composite powder, especially the grain size and particle size distribution. , water content, oxygen content and sintered bowls and boats, etc.

Method used

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  • A method for preparing nano-wc-co composite powder by high temperature spray drying and short process
  • A method for preparing nano-wc-co composite powder by high temperature spray drying and short process
  • A method for preparing nano-wc-co composite powder by high temperature spray drying and 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 nano-WC-Co composite powder with high-temperature spray drying and a short process, which uses water-soluble ammonium metatungstate, water-soluble cobalt salt and water-soluble carbon source as raw materials, and the raw materials are added to a Pure water is prepared into a slurry in a heated and stirred container, and the slurry is transported to a closed centrifugal high-temperature spray drying tower with nitrogen through a material pump for drying, and then the spray-dried precursor material is crushed and sieved, and then carried out Reductive carbonization, and then the reduction carbonized material is crushed and screened by airflow, and finally combined into batches to obtain nano WC-Co composite powder. The nano-WC-Co composite powder prepared by the invention has stable performance, single phase, uniform composition, narrow particle size distribution, fine crystal grains, and easy control of powder composition, which is a process that can be industrialized and mass-produced.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22B22F9/04B22F1/054B82Y30/00B82Y40/00
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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