A method for sintering injection-molded copper-based components

Abstract

The present invention provides a sintering method for injection-molded copper-based parts, which includes the following steps: (1) selecting copper alloy powder and binder, and making copper alloy powder and binder according to a preset volume ratio into a feed (2) Put the feed material on the copper alloy powder injection machine to form an injection blank, and use an organic solvent to remove part of the binder from the injection blank to form a degreased blank; (3) Put the degreased blank in a vacuum atmosphere for sintering (4) Introduce gas, degrease at low temperature, and sinter at high temperature to make a sintered billet. In the method of the present invention, the hydrogen gas is passed through the low-temperature section to avoid the reaction between the hydrogen gas and the graphite contained in the sintering furnace, the degreasing is more complete, and the oxygen content of the copper alloy powder particles is reduced, the activity is increased, and it is more conducive to sintering; The argon gas flow in the section avoids the volatilization of the alloy components in the copper alloy powder, avoids the pollution of the sintering furnace and the change of the material components.

Description

technical field [0001] The invention relates to the technical field of sintering, in particular to a sintering method for injection-molded copper-based components. Background technique [0002] Copper is the earliest metal used by human beings, and it is also one of the most widely used metals. Copper and copper alloys are widely used in industry, agriculture, national defense, military aerospace, Copper-based parts can be seen everywhere. In order to save materials and reduce waste, powder metallurgy is used to manufacture copper-based parts, which are more and more widely used. The key to copper-based powder metallurgy parts lies in forming and sintering. The sintering of traditional copper-based powder metallurgy products generally uses mesh belt continuous furnaces, bell furnaces, and pit furnaces under normal pressure under the protection of an ammonia decomposition atmosphere. Furnace, muffle furnace for sintering, sintered products are mostly traditional powder compa...

AI Technical Summary

Problems solved by technology

However, for metal injection molding copper-based materials, due to the high binder content, it is difficult to remove the binder. In order to effectively remove the binder, the heating rate is very slow, and a large amount of ammonia decomposition atmosphere must be introduced. The efficiency of the sintering method is low, the yield rate of the product is low, and the production cost naturally increases