Preparation method of nano tungsten trioxide powder

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 ...

AI Technical Summary

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