Vacuum melting method for nickel-aluminum intermetallic compound

Abstract

The invention discloses a vacuum melting method for a nickel-aluminum intermetallic compound. The vacuum melting method comprises the steps that raw materials are selected and added into a crucible and a secondary charging hopper respectively, inert gas pipes at the bottom of the crucible are used for argon blowing after the raw materials are heated, reasonable argon blowing moments and pressure are selected, the alloy liquid is ensured to be stirred by gas in the smelting process so as to become boiling, gas bubbles are formed and carry inclusions which are not easy to melt in the alloy to float up to reach the surface of the alloy liquid, the pressure is gradually reduced in the pouring process, and meanwhile, an uppermost metal liquid which is about 3cm deep finally and enriched in inclusion is left in the crucible.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a vacuum melting method for nickel-aluminum intermetallic compounds. Background technique [0002] Intermetallic Ni 3 Al has abnormal yield strength-temperature effect, as well as high wear resistance and corrosion resistance. It has become an important structural material in the contemporary aerospace industry, civil industry and other fields, especially in the field of aeroengine blades. prospect. 3D printing, or additive manufacturing, is a rapid prototyping process that has emerged in recent years. It adopts layer-by-layer powder coating, laser or electron beam melting and molding to realize the finishing molding of precision parts and avoid the occurrence of defects in the casting process. Defects such as shrinkage cavity and porosity have become a new material processing method. [0003] At present, the powder used in 3D printing is generally obta...

AI Technical Summary

Problems solved by technology

[0003] At present, the powder used in 3D printing is generally obtained by vacuum casting into ingots after smelting, followed by secondary smelting and atomization to make powder, and in the process of vacuum smelting and pouring, the purity of the alloy melt is guaranteed. The product performance in the follow-up milling and even 3D printing process is very important. The vacuum melting currently used is generally carried out in the crucible of the induction furnace through vacuum induction melting and then pouring. However, the raw materials used for nickel-aluminum intermetallic compounds contain relatively high There are many solid inclusions, which are difficult to melt during the smelting process, and at the same time, it is difficult to float to the surface due to the short melting time. In the ingot, it will affect the performance of the powder produced