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Method for preparing inorganic nano composite powder

An inorganic nano-composite powder technology, applied in the direction of coating, etc., can solve the problems of gas by-product retention, large gas consumption, prolonged reaction time, etc., and achieve the effect of stable storage

Inactive Publication Date: 2006-10-25
成都汉基投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Thermochemical reactions such as decomposition, reduction, carbonization, and removal of free carbon are all carried out in the same fluidized bed reactor, and the gas by-products stay in the reaction space for a long time, which is not conducive to the chemical balance to produce metal or metal carbide moving in the direction of the
2. H 2 The presence of O by-products in the reactor for a long time tends to increase the grain size and oxygen content of intermediate products
3. The temperature and atmosphere of several thermochemical reactions are different, and it is difficult to achieve accurate control in the same reactor
4. Large gas consumption and high energy consumption
[0005] WO after spray drying 3 Two reaction reduction, tube furnace carbonization method to WO 3 The reduction is divided into two steps, that is, the first step is low temperature reduction and the second step is higher temperature reduction. Although finer tungsten powder can be obtained, the subsequent process is the same as the traditional process and between the two reductions, high-speed shearing is added. The crushing and drying process makes the whole process more complicated and lengthy

Method used

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  • Method for preparing inorganic nano composite powder
  • Method for preparing inorganic nano composite powder
  • Method for preparing inorganic nano composite powder

Examples

Experimental program
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Effect test

Embodiment 1

[0107] Ammonium metatungstate, (NH 4 ) 6 (H 2 W 12 o 40 ) 4 h 2 O, Co(NO 3 ) 2 ·6H 2 O is the raw material, and about 1 kg of WC-Co final product is prepared according to the Co / W molar ratio of 23%, 0.585, 0.37, 0.21, and 0.10.

[0108] Take 4.00-4.01 moles of ammonium metatungstate, 1.01-1.02 moles of cobalt nitrate, add 20 g of polyethylene glycol and dissolve in 5.0 liters of deionized water, ultrasonic (20KHz) or ultra-high-speed shear emulsification and mixing (20000-30000rpm) 5- A solution precursor was obtained after 30 minutes. Supersonic (20KHz) or ultrahigh-speed centrifugal (20,000-38,000 rpm) spray dryers can obtain powder precursors under the conditions of feed temperature of 220-250°C, outlet temperature of 110-130°C, and feed rate of 210-230ml / min. (CoO-WO 3 , CoWO 4 ). After being collected by the cyclone collector, it is transported to the first-stage fluidized bed under negative pressure. At 350-450°C, the fluidization rate is 18.00-19.00m / s, N ...

Embodiment 2

[0111] Tungstic acid H 2 WO 4 , NH 4 OH, Co(NO 3 ) 2 ·6H 2 O is the raw material, and about 1 kg of WC-Co final product is prepared according to the mass fraction content of cobalt in WC-Co of 23%, 15%, 10%, 6% and 3%. Take H 2 WO 4 1195-1200g dissolved in 3-3.1L 28% NH 4 After OH, add Co(NO 3 ) 2 ·6H 2 817-818g and 50g polyethylene glycol, with (20KHz) or ultra-high speed shear emulsification and mixing for 15 minutes, the following steps are the same as in Example 1, to obtain the WC-Co alloy covered with binder paraffin. The particle size is less than 50nm, the Co content is 14.99-15% mass fraction, and does not contain η phase and free carbon.

Embodiment 3

[0113] WO recovered by hydrothermal method 3 , NH 4 OH, Co(NO 3 ) 2 ·6H 2 As a raw material, according to the Co / W molar ratio of 1, 0.583, 0.37, 0.21, 0.1, prepare about 1kg of WC-Co final product.

[0114] Take WO 3 4.81 moles, dissolved in 3.0L 28% NH 4 OH, then add Co(NO 3 ) 2 ·6H 2 O1.87-1.88 moles, mixed for 5 minutes with ultrasonic or ultra-high-speed shear emulsifier. The following steps are the same as in Example 1 to obtain WC-Co alloy powder. The particle size is 65nm, the Co content is 10.52% mass fraction, and there is no η phase and free carbon.

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Abstract

The present invention relates to a nano powder body preparation method. Said preparation method includes the following steps: preparing compound salt solution, adopting low-temperature spray-drying process to making the compound salt solution into compound powder body precursor, then utilizing closed loop four-stage fluidized bed to make the precursor respectively undergo the chemical reactions of decomposition reduction, reduction, carbonization and removing free carbon so as to obtain the invented nano compound powder body.

Description

technical field [0001] The invention relates to a preparation method of inorganic nanocomposite powder, which is a closed-loop four-stage hierarchical fluidization method, and belongs to the field of inorganic chemical industry. Background technique [0002] With the rapid development of high-tech fields such as aerospace and electronic information, the requirements for small, light, thin and thin are becoming more and more stringent, and the corresponding strict requirements for processing tools are no exception. For example, the miniaturization of cutting tools is The material is required to have higher performance, such as higher toughness, high tear resistance, high hardness, etc. For this reason, the particle size of the alloy is required to be less than 0.5 μm, and there are no micro-defects in composition and structure. Therefore, only cemented carbide powder with a nanometer size <100nm can meet the above requirements. However, the particle size of the powder pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/30B22F1/02
Inventor 戴受惠吴观和邱邦臣
Owner 成都汉基投资有限公司