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Large-capacity steam turbine generator rotor copper alloy slot wedge and its preparing method

A technology of steam turbine generator and rotor copper, applied in the manufacture of motor generators, electromechanical devices, electrical components, etc., can solve the problems of high alloy cost, environmental and human pollution and harm, etc. Scattering effect, high conductivity effect

Inactive Publication Date: 2006-05-24
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alloy cost is high
And it contains a high content of chemically active harmful element Be, which is easy to pollute and harm the environment and human body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Embodiment 1: When the composition ratio of the alloy is Ni: 1.40%. Si: 0.60%, Cr: 0.05%, Be: 0.40%, Cu: balance. Melted in a medium-frequency induction furnace, using a bottom pour open pouring system, the molten metal is filtered and purified, the iron mold is cast into a round ingot, turned on a lathe to remove surface casting defects, hot forged at 900 ° C to 650 ° C, and kept at 935 ° C 1 hour, quench solution treatment in water, carry out extrusion cold deformation with 35% deformation, heat preservation at 460°C for 5.0 hours aging treatment, and cool in air. The tensile strength σ of copper alloy b =767MPa, yield strength σ 0.2 =652MPa, elongation: δ=16.1%, hardness HV 30 =242, conductivity C=49.56%IACS. Ultrasonic flaw detection, pass rate reaches 89.2%.

Embodiment 2

[0008] Example 2: When the composition ratio and weight percentage of the alloy are Ni: 1.535%, Si: 0.385%, Cr: 0.13%, Be: 0.325%, and Cu: the balance. The molten metal is smelted in an intermediate frequency induction furnace, filtered and purified, iron molds are cast into round ingots, turned on a lathe to remove surface casting defects, hot forged at 900°C to 680°C, kept at 950°C for 1 hour, quenched and solidified in water Melt treatment, after extrusion and cold deformation with 35% deformation, heat preservation at 470°C for 4.5 hours, air cooling aging treatment. The tensile strength σ of the alloy b =772MPa, yield strength σ 0.2 =648MPa, elongation δ=15.8%, hardness HV 30 =248, conductivity C=48.76%IACS. The qualified rate of ultrasonic flaw detection reached 86.6%.

example 3

[0009] Example 3: When the composition ratio of the alloy is Ni: 1.98% by weight. Si: 0.75%, Cr: 0.22%, Be: 0.25%, Cu: balance. During casting, the liquid metal is filtered and purified by two filters with different porosity, casted by the method of the above example, forged and shaped, kept at 975°C for 1.5 hours, quenched and solid-solution treated in water, forged and cooled with 50% deformation Deformation, 500°C, heat preservation for 4 hours and air cooling aging treatment. The tensile strength σ of the alloy b =782MPa, yield strength σ 0.2 =661MPa, elongation δ=15.2%, hardness HV 30 =246, conductivity C=48.32% IACS. The qualified rate of ultrasonic flaw detection reaches 85%.

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Abstract

Slot wedge material is copper base alloy containing following elements: (in weight percent) Ni 1.35-2.05úÑ, Si 0.40-0.80úÑ, Cr, 0.05-0.25úÑ, Be 0.15-0.40úÑ, other as Cu. Using following processes makes alloy possess allround performance: hot forging, solution treatment, cold deformation, primal ageing strengthening process. The said allround mechanical and physical performances are: tensile strength larger than and equal to 760Mpa, yield strength larger than and equal to 640Mpa, extensibility larger than and equal to 15úÑ etc. Supersonic inspection shows that the disclosed alloy is accorded with operation requirement as well as reaches or exceeds specification of CuCo2BeZr copper alloy. Advantages are: lowering cost more than 30úÑ, saving resources of noble element.

Description

technical field [0001] The invention belongs to a turbogenerator rotor slot wedge material, in particular to a large-capacity turbogenerator rotor copper alloy slot wedge and a preparation method thereof. Background technique [0002] The rotor of a large-capacity generator is an important core component of the generator, and generally weighs more than 53,000 to 64,000kg. Some main components of the generator, such as turbine blades, are fixed on the rotor and run at a speed of more than 3,000 rpm. Slot wedge copper alloy is inlaid in the longitudinal groove on the surface of the rotor to compress the field winding wire and insulator at the bottom of the groove. It must bear the wire and insulator in the groove and itself, and generate huge centrifugal force due to high-speed operation. In addition, under the action of the negative-sequence rotating magnetic field generated by the current, especially when an asymmetric short-circuit fault occurs in the generator, a large ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K3/487B22D21/00B22D25/00C22C9/00C22C9/06H02K15/00
Inventor 谢春生孙爱俊迟永祥陈大龙孙景明朱治愿吕秀芬任合
Owner JIANGSU UNIV OF SCI & TECH
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