Production method for high-performance special-shaped iron-cobalt soft magnetic alloy parts

A soft magnetic alloy, high-performance technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems that affect the sintering performance and magnetic properties of materials, high saturation magnetic induction, low output rate of alloy powder, etc., and achieve improvement Microstructural structure, reduced manufacturing cost, and improved sintering activity

Inactive Publication Date: 2015-08-19
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problems of powder injection molding method to prepare iron-cobalt soft magnetic alloy are: one, powder injection molding iron-cobalt soft magnetic relative density is low (usually 90% ~ 97%), due to the existence of a small amount of pores and other defects, the material It is difficult to achieve high saturation magnetic induction, high magnetic permeability and low coercive force; second, when iron, cobalt, vanadium, chromium and other element powders are used as raw materials, due to the easy oxidation of vanadium powder and chromium powder, the thermodynamic stability is good. Vanadium oxide, chromium oxide and other oxides in the alloy will cause oxide inclusions in the alloy, thereby affecting the sintering performance and magnetic properties of the material; third, when alloy powder is used as raw material, although the shortcoming of easy oxidation of element powder can be properly overcome, due to The output rate of the fine-grained alloy powder suitable for injection molding prepared by the atomization method is low, and the price of the alloy raw material powder is very expensive and the cost is high

Method used

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  • Production method for high-performance special-shaped iron-cobalt soft magnetic alloy parts

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Carbonyl iron powder, reduced cobalt powder, and vanadium iron powder are used as raw materials, and the ratio of iron: cobalt: vanadium is 49:49:2 by weight, and ball milled in a planetary ball mill for 20 hours under an argon atmosphere. It is 10:1. Select microcrystalline wax, high-density polyethylene, polypropylene and stearic acid as the forming agent, and by weight percentage microcrystalline wax: high-density polyethylene: polypropylene: stearic acid is 60:25:10:5 ingredients, each The organic substances were mixed for 2 hours at a temperature of 150° C. in a molten state. Ball mill powder and forming agent are kneaded in a kneader at 150°C for 3 hours at a volume ratio of powder to forming agent of 52:48. The mixture of powder and binder is formed on an injection molding machine, and injected into a mold under the conditions of a temperature of 160°C and an injection pressure of 100 MPa. After soaking the formed body in n-heptane at 20°C for 4 hours, the gree...

Embodiment 2

[0021] Using the same raw material powder and material composition ratio as in Example 1, various raw material powders will be mixed in a V-shaped mixer for 12 hours, and the raw material powders will not be processed by high-energy ball milling. Forming and degreasing process, after sintering at 1400°C for 3 hours, the magnetic properties of the material are tested directly, without hot isostatic pressing and subsequent heat treatment of the powder. The properties of the prepared soft magnetic material: the relative density is 93.4%, the saturation magnetic induction is 1.82T, the maximum magnetic permeability is 2.38mH / m, and the coercive force is 115.61A / m.

Embodiment 3

[0023] Using the same raw material powder and material composition ratio as in Example 1, various raw material powders will be mixed in a V-shaped mixer for 12 hours, and the raw material powder is not processed by high-energy ball milling. Others adopt the same molding as in Example 1, Sintering, hot isostatic pressing and heat treatment processes. The properties of the prepared soft magnetic material: the relative density is 99.2%, the saturation magnetic induction is 2.14T, the maximum magnetic permeability is 5.12mH / m, and the coercive force is 86.43A / m.

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Abstract

The invention discloses a production method for high-performance special-shaped iron-cobalt soft magnetic alloy parts and belongs to the field of magnetic materials. The production method includes: adopting powder particles as raw materials, and placing the raw materials in a high-energy ball-milling machine for ball milling for 1-40 hours prior to evenly mixing ball milling powder with a forming agent so as to enable a mixture of the powder particles and the forming agent to infuse or flow into a mold for formation under good liquidity conditions to obtain green bodies of parts with complicated shapes; removing the forming agent from the obtained green bodies, obtaining pretreating pieces via sintering, and placing the pretreating pieces under high temperature for treatment prior to final heat treatment to obtain final products. An alloy is even in texture and excellent in performance with saturation flux density Bs greater than 2.3T, maximum permeability greater than 5mH / m and coercivity force less than 110A / m, the parts with the final shapes can be directly prepared, resources and energy sources are saved, and manufacturing cost is lowered.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and in particular provides a method for preparing high-performance special-shaped iron-cobalt series soft magnetic alloy parts. Background technique [0002] Among metal soft magnetic materials, iron-cobalt soft magnetic alloys have extremely high saturation magnetic induction intensity Bs (2.4T), the largest magnetostriction coefficient λs (70~80╳10 －6 ) and the highest Curie temperature (980 ~ 1100 ℃), so it can be used as a ferromagnetic element that requires high Bs, high λs, low frequency and high temperature, and is suitable for making micro Special motors, electromagnet poles, relays, force rejecting motor rotors, power transformers, magnetostrictive transducer cores, etc. With the development of magnetic circuit components towards miniaturization and multi-function, the size of the soft magnetic alloy parts used is getting smaller and smaller, and the shape is more and more complex. Du...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F1/00H01F1/147
Inventor 秦明礼鲁慧峰章林丁向莹贾宝瑞曲选辉
Owner UNIV OF SCI & TECH BEIJING
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