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Flexible liner for thermal treatment of magnetic alloy rings

A kind of alloy ring, flexible technology, applied in the direction of heat treatment furnace, heat treatment equipment, furnace, etc., can solve the problems of different crystallization shrinkage time, collapse of magnetic alloy ring, deformation of inner ring, etc., and achieve reasonable structural design and material selection, and use Convenience and ideal performance

Pending Publication Date: 2022-07-01
INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For large-size magnetic alloy rings (the ratio of inner diameter to height ≥ 3), since the strip height is much smaller than the diameter of the lining, the magnetic alloy ring is prone to collapse after removing the lining. Even, the inconsistent crystallization shrinkage time leads to serious deformation of the inner ring, forming a polygonal state

Method used

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  • Flexible liner for thermal treatment of magnetic alloy rings
  • Flexible liner for thermal treatment of magnetic alloy rings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In this example, 3 large-sized magnetic alloy rings (outer diameter 500mm, inner diameter 300mm, height 25mm) with no inner lining, hard inner lining and flexible inner lining installed respectively are heat treated at 500°C, and the thickness of the hard inner lining material is 20 mm. The outer flexible material of the flexible inner lining is made of glass fiber blanket with a thickness of 10mm, and the inner rigid material is made of steel with a thickness of 10mm. Measure the hardened area of ​​the magnetic alloy ring and the circumference of the inner ring after heat treatment, and the test results are as follows:

[0048] Table 1 Hardened zone of magnetic alloy ring and circumference of inner ring after heat treatment

[0049]

[0050] The magnetic permeability μ value test at 1MHz is carried out on the magnetic alloy ring after heat treatment, and the results are as follows:

[0051] Table 2 Magnetic permeability of magnetic alloy ring after heat treatment ...

Embodiment 2

[0055] In this example, magnetic alloy rings with inner linings of different materials are heat-treated at 500 °C, and the influence of different inner linings on magnetic alloy ring products is evaluated by measuring the circumference of the magnetic alloy ring after heat treatment at 500 °C, the hardened zone and the magnetic properties at 1 MHz. , Among them, the size of the magnetic alloy ring is selected as a large size magnetic alloy ring with an outer diameter of 800mm and an inner diameter of 400mm and a height of 30mm. The test results are as follows:

[0056] Table 3 Hardened zone of magnetic alloy ring and circumference of inner ring after heat treatment

[0057] serial number Lining form Young's modulus Thermal expansion coefficient Inner ring circumference Hardened zone thickness 1 steel 210GPa 12×10 -6 / K

±0.1mm 10.2mm 2 cement 30GPa 8×10 -6 / K

±0.2mm 8.2mm 3 fiberglass blanket ＜0 ±0.5mm 0mm

[0...

Embodiment 3

[0062] In this embodiment, the thickness (radial direction) of the flexible material in the flexible inner lining of the large-sized magnetic alloy ring is adjusted to conduct a heat treatment experiment. Among them, the flexible inner lining adopts the outer layer of glass fiber blanket, the inner layer is in the form of steel, the thickness of steel is fixed at 5mm, and the outer layer of glass fiber blanket adopts different thicknesses of 1mm, 2mm, 5mm, 10mm, 20mm, and the outer diameter is 800mm. The large size magnetic alloy ring with an inner diameter of 400mm and a height of 30mm is heat-treated at 500°C. The influence of the thickness of the flexible material in the flexible lining on the magnetic alloy ring product was evaluated by measuring the circumference of the magnetic alloy ring after heat treatment, the hardened zone and the magnetic properties at 1MHz. The test results are as follows:

[0063] Table 5 Hardened zone of magnetic alloy ring and circumference of ...

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Abstract

The invention relates to a flexible lining for heat treatment of a magnetic alloy ring. The flexible lining is a single flexible material arranged on the inner side of the magnetic alloy ring in a sleeving mode or a composite material composed of an outer-layer flexible material and an inner-layer rigid material. Wherein the Young modulus of the flexible material is less than 10 MPa, and the Young modulus of the rigid material is 1-500 GPa; the thermal expansion coefficient of the flexible material is less than 0, and the thermal expansion coefficient of the rigid material is (1-50) * 10 <-6 > / K. The flexible lining for heat treatment of the magnetic alloy ring has the characteristics of reasonable structural design, convenience in installation and the like, and can reduce the extrusion stress on the large-size magnetic alloy ring in the heat treatment process, so as to solve the problems that an inner ring of the magnetic alloy ring and an outer ring of a conventional hard lining extrude each other in the heat treatment process, additional external stress is generated, and the service life of the magnetic alloy ring is prolonged. And further, an annular hardening area is formed on the magnetic alloy ring strip.

Description

technical field [0001] The invention belongs to the technical field of magnetic alloy ring processing, and relates to a flexible inner lining used for heat treatment of magnetic alloy rings, in particular to a flexible inner lining used for heat treatment of large-sized magnetic alloy rings. Background technique [0002] At present, nanocrystalline ribbons are widely used in transformers, high-frequency transformers, accelerator high-frequency cavities and other fields. The nanocrystalline strip is made of high-temperature molten alloy by a single-roll cooling method, and the final formed material is an amorphous alloy. Magnetic alloy ring products made of nanocrystalline ribbons usually need to be heat treated above the crystallization temperature of the material to generate nanoscale grains, so that the magnetic permeability of the material is increased, the loss is reduced, and the optimal performance is achieved. However, in the process of heat treatment, due to the for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/40
CPCC21D9/40
Inventor 许哲金鹏杨建成付盺丛岩庞靖杨东王泽凡袁粼
Owner INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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