Inclusion precipitation control technology for silicon steel for motor

A production process and material technology, which is applied in the field of inclusion precipitation control process of silicon steel for motors, can solve the problems of difficult grain growth and reduced magnetic properties of finished products, so as to improve production efficiency, increase coercive force, and reduce production cycle Effect

Inactive Publication Date: 2018-11-06
LUAN MICRO & SPECIAL MOTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when the precipitates in cold-rolled silicon steel are small and dispersed, during the annealing process, the precipitates will have a pinning effect on the grain boundaries, making it difficult for the grains to grow, resulting in a decrease in the magnetic properties of the finished product

Method used

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  • Inclusion precipitation control technology for silicon steel for motor
  • Inclusion precipitation control technology for silicon steel for motor
  • Inclusion precipitation control technology for silicon steel for motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Ingredients: The proportion of materials according to weight percentage is as follows: Rb (rubidium) 16%, Fe (iron) 75.7%, B (boron) 1.3%, Dy (dysprosium) 3.5%, Ni (nickel) 3.3%, S ( Sulfur) 0.09%, Nb (niobium) 0.04%; (specifically, pure iron, boron-iron alloy, rare earth alloy containing Rb and Dy, nickel-iron alloy, niobium-iron alloy and sulfur can be used to prepare materials according to the above ratio)

[0034] 2. Vacuum melting: put the material into the melting furnace for melting, the vacuum in the melting furnace is kept below 0.1 Torr, and the melting temperature of the prepared material is between 1580 ° C and 1620 ° C;

[0035] 3. Throwing flakes: After vacuum smelting, pour fully melted molten steel onto the high-speed rotating water-cooled copper rollers, and control the thickness of the casting flakes by controlling the speed of the copper rollers, and the thickness of the flakes should be controlled below 10mm , the tablet should not be too thick in...

Embodiment 2

[0061] 1. Ingredients: The ratio of materials according to weight percentage is as follows: Rb (rubidium) 17.8%, Fe (iron) 76.6%, B (boron) 1.1%, Dy (dysprosium) 2%, Ni (nickel) 2.4%, S ( sulfur) 0.07%, Nb (niobium) 0.025%. (Specifically, pure iron, boron-iron alloy, rare earth alloy containing Rb and Dy, nickel-iron alloy, niobium-iron alloy and sulfur can be used to prepare materials according to the above ratio)

[0062] 2. Vacuum melting: put the material into the melting furnace for melting, the vacuum in the melting furnace is kept below 0.1 Torr, and the melting temperature of the prepared material is between 1580 ° C and 1620 ° C;

[0063] 3. Throwing flakes: After vacuum smelting, pour fully melted molten steel onto the high-speed rotating water-cooled copper rollers, and control the thickness of the casting flakes by controlling the speed of the copper rollers, and the thickness of the flakes should be controlled below 10mm , the tablet should not be too thick in or...

Embodiment 3

[0089] 1. Ingredients: The proportion of materials according to weight percentage is as follows: Rb (rubidium) 16.5%, Fe (iron) 76.15%, B (boron) 1.2%, Dy (dysprosium) 3%, Ni (nickel) 3%, S ( sulfur) 0.08%, Nb (niobium) 0.03%. (Specifically, pure iron, boron-iron alloy, rare earth alloy containing Rb and Dy, nickel-iron alloy, niobium-iron alloy and sulfur can be used to prepare materials according to the above ratio)

[0090] 2. Vacuum melting: put the material into the melting furnace for melting, the vacuum in the melting furnace is kept below 0.1 Torr, and the melting temperature of the prepared material is between 1580 ° C and 1620 ° C;

[0091] 3. Throwing flakes: After vacuum smelting, pour fully melted molten steel onto the high-speed rotating water-cooled copper rollers, and control the thickness of the casting flakes by controlling the speed of the copper rollers, and the thickness of the flakes should be controlled below 10mm , the tablet should not be too thick in...

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Abstract

The invention relates to a permanent magnet material, in particular to a permanent magnet material for a motor and a processing technology for the permanent magnet material. The permanent magnet material comprises the following elements in percentages by mass: 16-17.8% of Rb (rubidium), 75.7-76.6% of Fe (ferrum), 1.1-1.3% of B (boron), 2-3.5% of Dy (dysprosium), 2.4-3.3% of Ni (nickel), 0.07-0.09%of S (sulfur) and 0.025-0.04% of Nb (niobium). All alloys and pure iron are put into a smelting furnace to be smelted according to a smelting principle, spinning, crushing and molding in a magnetic field are carried out, and sintering is finally carried out to obtain a finished product. According to the permanent magnet material, the limitations that a relatively thick product cannot be processedand the penetration time is long, of the conditions, such as the diffusion rate on a traditional penetration method are broken through. Precipitation of the Dy element at a grain boundary is achievedin solidification and subsequent secondary phase transition processes of molten steel through directly adding the Dy element in the smelting process. The target of improving the coercivity of the permanent magnet material is finally achieved. According to the permanent magnet material, the influence of the thickness of the material is avoided, the high-coercivity permanent magnet material with any thickness can be produced and the processing efficiency is high.

Description

technical field [0001] The invention relates to the field of materials, in particular to a process for controlling the precipitation of inclusions in silicon steel for motors. Background technique [0002] Silicon alloy steel with a silicon content of 1.0% to 4.5% and a carbon content of less than 0.08% is called silicon steel. It has the characteristics of high magnetic permeability, low coercivity, and large resistivity, so hysteresis loss and eddy current loss are small. It is mainly used as magnetic material in motors, transformers, electrical appliances and electrical instruments. [0003] Since inclusions or precipitates are generally non-magnetic or weakly magnetic, the existence of inclusions or precipitates will cause lattice distortion, resulting in lattice defects such as dislocations and vacancies, and internal stress, which hinders the formation of magnetic domain structures. Change, the magnetization resistance increases, the coercive force increases, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02C22C38/60C22C38/08C22C38/12C22C33/02
CPCH01F1/0577C22C33/0278C22C38/002C22C38/005C22C38/08C22C38/12C22C38/60H01F41/0253H01F41/0266
Inventor 段志诚陆永为晁明男荣超杰方俊周伟何宗芝李文娜
Owner LUAN MICRO & SPECIAL MOTOR
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