Method of preparing high-performance powder metallurgy product by coating alloy powder with organic matter

Abstract

The invention provides a method of preparing a high-performance powder metallurgy product by coating alloy powder with an organic matter, and belongs to the field of powder metallurgy. The method comprises the following steps that the surface of the alloy powder is coated with a layer of an organic matter film by a solution coating method, the organic matter is dissolved in a solvent, a layer of aliquid film is formed on the surface of the alloy powder, after the solvent is removed, the alloy powder can be uniformly coated with the organic matter, any chemical reactions are not required, thesurface of the alloy powder is coated with the layer of the organic matter film, and the purpose that the easy-to-oxidize alloy powder is isolated from oxygen is achieved. The possibility that the surface of the easy-to-oxidize alloy powder can react with the oxygen is very high, the mechanical performance of a formed alloy component is relatively poor due to the increase of the oxygen content inthe forming process, and the organic matter is used for coating, so that the oxygen control effect in the forming process can be achieved effectively; and the oxidation resistance of the alloy powdercan be improved through the coating treatment in the forming process, so that the relatively low oxygen content and the good mechanical performance are advantageously kept after the forming is carriedout.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and provides a method for preparing high-performance powder metallurgy products by coating alloy powder with organic matter. Background technique [0002] Powder materials in powder metallurgy, especially particles with smaller particle sizes, are easily oxidized due to their small size effect resulting in increased surface active sites, large specific surface area, and large specific surface energy. For oxygen-sensitive metal materials, when the metal powder is oxidized, the oxygen content of the raw material will increase, which will not only affect the press-formability of the powder, but also seriously affect the various properties of the final product. Taking titanium alloy as an example, the plasticity of titanium alloy will drop sharply with the increase of oxygen content. When the oxygen content increases from 0.3% to 0.4%, the elongation will drop from more than 10% to about 3%. Therefor...

AI Technical Summary

Problems solved by technology

When applying these processes, easily oxidized alloy powders, such as titanium, magnesium, copper, neodymium iron boron and other powders, are easy to react with oxygen due to their large surface energy, and the increase in oxygen content during the forming process leads to poor mechanical properties of the formed alloy parts , especially the finer the titanium alloy powder, the larger the specific surface area, and the more serious the oxygen increase, which will lead to oxidation when placed in the air at room temperature

Generally, injection molding and 3D printing have low oxygen content requirements for easily oxidized alloy powder raw materials, which leads to increased costs, and in the forming process, measures such as controlling the production conditions such as the forming atmosphere, temperature and sintering environment are generally used to control the oxygen of the alloy powder.

[0004] The current oxygen control methods for easily oxidized alloy powders mainly focus on the increase of oxygen and carbon in the process of processing, and seldom carry out surface modification on alloy powders.