Preparation method of nano tungsten trioxide powder

A nano-tungsten trioxide and powder technology, applied in the field of powder metallurgy, can solve the problems of difficulty in mass production of nano-powder stably, no mass production of nano-tungsten trioxide powder, large investment in production line transformation, etc. The effect of less investment in control and production

Inactive Publication Date: 2014-04-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that undecomposed polymer or free carbon can still be found in the final product, which can affect product performance
[0029] Some of these methods are very different from traditional techniques, and the investment in production line transformation is large; some of them are difficult to produce nano-powder in batches stably.
In general, there is still no simple and effective method for mass production of nano-tungsten trioxide powder, so that nano-tungsten carbide can be manufactured using traditional cemented carbide production lines

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Heat the saturated ammonium tungstate solution to 65°C, then add ammonium chloride in an amount of 8g / L, and stir for 0.5h; then add tartaric acid, ethylenediaminetetrapropionic acid and diethanolamine in order, respectively, in an amount of 11g / L, 32g / L and 6g / L, stir to dissolve completely and continue to stir for 1h; continue to stir and add 320ml / L of nitric acid to form tungstic acid gel; place the gel in a heating furnace to dry at 140°C and heat The speed is 1°C / min, heat preservation for 1h, then 2°C / min to 340°C, heat preservation for 3h for calcination, and finally ball milling to obtain nano-tungsten trioxide.

[0046]

Embodiment 2

[0048] Heat the saturated ammonium tungstate solution to 70°C, then add ammonium chloride in an amount of 13g / L, and stir for 1h; then add tartaric acid, ethylenediaminetetrapropionic acid and diethanolamine in order, respectively, in an amount of 14g / L L, 23g / L and 9g / L, stir to dissolve completely and keep stirring for 2h; keep stirring and add 380ml / L nitric acid to form tungstic acid gel; 2°C / min, heat preservation for 2h, then 3°C / min to 380°C, heat preservation for 2h for calcination, and finally ball milling to obtain nano-tungsten trioxide.

[0049]

Embodiment 3

[0051] Heat the saturated ammonium tungstate solution to 68°C, then add ammonium chloride in an amount of 12g / L, and stir for 1h; then add tartaric acid, ethylenediaminetetrapropionic acid and diethanolamine in order, respectively, in an amount of 13g / L L, 25g / L and 8g / L, stir to dissolve completely and keep stirring for 2h; keep stirring and add 370ml / L nitric acid to form tungstic acid gel; place the gel in a heating furnace at 150°C to dry, the heating rate 2°C / min, heat preservation for 2h, then 3°C / min to 370°C, heat preservation for 2h for calcination, and finally ball milling to obtain nano-tungsten trioxide.

[0052]

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Abstract

The invention relates to a preparation method of nano tungsten trioxide powder, and belongs to the field of powder metallurgy technology. The method comprises the following steps: heating a saturated ammonium tungstate solution till 65-70 DEG C, then adding ammonium chloride, tartaric acid, ethylenediamine tetra-n-propionic acid and diethanol amine respectively in sequence, keeping stirring during the adding process till being dissolved completely and continuously stirring for 1-2h; then adding nitric acid under the condition of keeping stirring to form tungstic acid gel; then putting the gel in a heating furnace for drying at 140-150 DEG C, then warming up till 340-380 DEG C for calcination, and finally ball-milling and smashing to obtain the nano tungsten trioxide powder with the average particle size of 23-28 nm. The method disclosed by the invention is mild and stable for reaction process and easy to control, prepared nano tungsten trioxide is thin and uniform in particles and high in powder purity. Moreover, the process is simple and easy to control, so that the industrial production investment is few, the production technology is simple and convenient, the production cost is low, and industrial large-scale production is convenient to realize.

Description

technical field [0001] The invention relates to a technology for preparing nanometer tungsten trioxide powder, belonging to the technical field of powder metallurgy. [0002] Background technique [0003] For WC-Co cemented carbide, refining WC grains is an effective way to improve the hardness and strength of cemented carbide, especially nano-WC-Co cemented carbide has superior performance and is widely used. One of the key technologies for producing nano-hard alloys is to prepare nano-WC powder or WC-Co composite powder. There are many ways to prepare it, and the more in-depth research methods are as follows: [0004] (1) Mechanical alloying [0005] Mechanical alloying is to carry out high-energy ball milling of the metal element powders in the alloy to be prepared, such as W-Ni-Fe, W-Cu and other element powders, in a stirring, planetary or rotor high-energy ball mill. Inert gas protection is used during the ball milling process. To prevent powder oxidation. During ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02B82Y30/00
Inventor 林涛王志邵慧萍张深根何新波柏景雷
Owner UNIV OF SCI & TECH BEIJING
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