Method for preparing plate-like structure WC-Co composite powder by utilizing waste cemented carbide

Abstract

The invention discloses a method for preparing plate-like structure WC-Co composite powder by utilizing waste cemented carbide. The method comprises the steps that (1) the waste cemented carbide is placed in a muffle furnace for oxidizing roasting in order to obtain a tungsten cobalt oxidation product; (2) the tungsten cobalt oxidation product is crushed in order to obtain tungsten cobalt composite oxide powder; (3) at least one of a tungsten oxide, a cobalt oxide and carbon is added into the tungsten cobalt composite oxide powder in order to regulate the content ratio between tungsten, cobaltand the carbon to reach a predetermined value; (4) inorganic salt is added into a mixture obtained from the step (3), and a molten salt reaction is conducted under inert gas protection in order to obtain a synthesized product; and (5) the synthesized product is rinsed in order to remove molten salt particles and obtain the plate-like structure WC-Co composite powder. The method has the advantagesof being simple in technological process and easy to operate, the prepared and obtained plate-like structure WC-Co composite powder is good in plate-like effect, high in purity and adjustable in composition and granularity, and the method can be used for preparing of high-performance plate-like grain cemented carbide.

Description

technical field [0001] The invention belongs to the field of metal-ceramic composite powder preparation. More specifically, the present invention relates to a method for preparing plate-shaped structure WC-Co composite powder by using waste cemented carbide, which belongs to the fields of recycling waste resources and preparation of metal-ceramic composite powder with special structure. Background technique [0002] Tungsten is a very important strategic element and plays an important role in the national economy and defense industry. WC-Co cemented carbide is one of the main uses of tungsten element, accounting for about 60% of the total consumption of tungsten. WC-Co cemented carbide not only has good strength, but also has relatively excellent toughness. It is widely used in oil and gas drilling, geological exploration, mining, rolls, mold materials, cutting tools, wear-resistant parts and other fields. It is currently the most widely used One of the wide range of tool ...

AI Technical Summary

Problems solved by technology

The mechanical crushing method uses mechanical force to forcibly break the waste alloy into fine powder, which has the characteristics of not changing the chemical composition of the waste and does not need to separate components such as tungsten and cobalt, but the efficiency of the mechanical crushing method is low; The method is to add zinc at high temperature to make cobalt and zinc form zinc-cobalt alloy, then remove zinc, crush and grind to obtain recycled composite powder, but it will affect the operators and the environment during the recovery process of gaseous zinc, and it is difficult to completely remove zinc; The electrochemical treatment method is to dissolve the binder phase metal cobalt in the solution under the action of an electric field, and then mechanically crush the remaining WC skeleton, but this method requires complicated process equipment, high investment costs and high production costs

In addition, at present, the alloys prepared from the regenerated powder obtained by the traditional recycling of waste alloys have poor performance and low added value, which seriously limits the development of recycling and reuse of waste cemented carbides.