A method for preparing high-performance powder metallurgy products by coating alloy powder with organic matter

Abstract

The invention provides a method for preparing high-performance powder metallurgy products by coating alloy powder with organic matter, which belongs to the field of powder metallurgy. The method of solution coating is used to coat a layer of organic film on the surface of the alloy powder, and the organic matter is dissolved in a solvent to form a liquid film on the surface of the alloy powder. After the solvent is removed, the organic matter can be evenly coated on the alloy powder without any chemical reaction. , Coating a layer of organic film on the surface of the alloy powder to achieve the purpose of isolating the easily oxidizable alloy powder from oxygen. The surface energy of easily oxidized alloy powder is large and easy to react with oxygen, and the increase of oxygen content in the forming process leads to poor mechanical properties of the formed alloy parts. The use of organic coating can effectively achieve the effect of oxygen control in the forming process, and in the forming process The coating treatment in the process can improve the oxidation resistance of the alloy powder, which is beneficial to maintain a low oxygen content and excellent mechanical properties after forming.

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.