A semi-continuous metal casting process of heat-resistant copper alloy and its application

Abstract

The invention discloses a heat-resistant copper alloy semi-continuous metal casting process and its application. The weight percentage of the copper alloy is composed of: Ni: 0.1-5.0wt%, Al: 0.01-0.5wt%, Si: 0.01-2.0 wt%, Cr: 0.01-1.0wt%, Cu: balance, the preparation process of the copper alloy profile is: batching-smelting-hot extrusion-cold drawing-aging treatment. On the basis of the copper alloy material containing Ni and Al, the present invention further adds Si and Cr elements, adopts semi-continuous casting to balance the reasonable ratio between each metal element, improves the performance of the nickel-silicon-copper alloy, and develops a Be-free , the Co-free CuNi2SiCrAl high-performance copper alloy is used to replace the beryllium-cobalt-copper series alloys, and the raw material cost of the material is greatly reduced. The inventive copper alloy can be applied to the slot wedge copper alloy parts of the turbogenerator.

Description

technical field [0001] The invention relates to the technical field of copper alloy manufacturing and processing, in particular to a semi-continuous metal casting process of heat-resistant copper alloy and its application. Background technique [0002] With the rapid growth of electricity demand, the design of large-capacity generator sets has been paid more and more attention, but some key components, such as generator rotor slot wedge copper alloy, mainly rely on imports. The generator rotor is the most critical part of the turbo generator set. The core component, when working, the turbine generator rotor generates huge centrifugal force at high speed, and at the same time, under the action of the magnetic field generated by the rotor current, a large induced current will be generated on the surface of the rotor. This current passes through the rotor slot wedge copper. When the alloy is used, it will generate a higher temperature, and cracks will occur under the overlappin...

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Problems solved by technology

[0002] With the rapid increase in demand for electricity, the design of large-capacity generator sets has been paid more and more attention. However, some key components, such as the generator rotor slot wedge copper alloy, mainly rely on imports. The generator rotor is the most critical part of the turbogenerator set. The core component, when working, the turbogenerator rotor generates a huge centrifugal force when it runs at high speed, and at the same time, under the action of the magnetic field generated by the rotor current, a large induced current will be generated on the rotor surface. This current passes through the rotor slot wedge copper Alloying will cause it to generate a higher temperature, and cracks will be generated under the overlapping effects of shutdown and creep, and may promote the further development of cracks, resulting in the fracture of the slot wedge alloy and causing the slot wedge to fly off, which may not only make the value hundreds of millions of yuan The explosion of the generator set will also cause major casualties

[0003] At present, alloys such as CuCo2BeZr and CuNi2Be, which are widely used in slot wedges, have reached the level of similar imported products in terms of performance, but the Be element is poisonous, and the trace steam generated in the process of melting, casting and heat treatment will have a greater poisonous effect on the human body and the environment. The international community has long called for the development of Be-free alloys to replace Be-containing alloys.

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