Soft-magnetic composite material and process for making magnetic conduction component by using same

Abstract

This invention relates to soft magnetic compound materials, which are characterized by the following: the said materials comprise iron material, isolation agent and lubrication agent with their weight percentage as 92-99 %, 0.5-5 % , 0.5-3 %; the said iron material is powder material, which comprise deoxidized powder, atomized iron powder, hydroxide powder and iron alloy with iron of 80-99.8%; Particle distribution of 20-500; the said isolation agent adopts nanometer calcium carbonate powder or ceramics powder or magnetic oxidation power; the said lubrication is micro powder. The process comprises the following steps: mixing, shaping, solidifying and stainless processing.

Description

Technical field: [0001] The invention relates to a soft magnetic composite material, in particular to a soft magnetic composite material constituting a magnetic conductive member in an electrical appliance and a method for manufacturing the magnetic conductive member from the soft magnetic composite material. Background technique: [0002] With the development of society, motors and electrical appliances with magnetically conductive components have been widely used in daily life. At present, most of the magnetic component materials in these electrical appliances are silicon steel sheets, which are widely used in medium and low frequency transformers and motor cores, especially power frequency transformers. Silicon steel is characterized by the highest saturation magnetic induction (above 2.0T) among commonly used soft magnetic materials, so when used as a transformer core, it can work at a very high operating point (such as a working magnetic induction value of 1.5T). However, si...

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Problems solved by technology

[0006] However, the above method has a relatively obvious weakness, that is, the direct cost of production is high, because:

[0007] ① Due to the irregular shape of various components, the utilization rate of materials is relatively low, and the waste produced is more;

[0008] ②, silicon steel sheet is expensive;

[0009] ③, waste is not easy to recycle

[0010] China Patent Office has published a patent application for invention "Electrical Appliances Made of Soft Magnetic Composite Materials" (application number: 03128171.0, publication number CN 1461089A). Powder, insulating agent and lubricant, the main raw material is pure iron powder, the selection of raw materials is narrow, and the price is very expensive, the market price is currently as high as 7,000 yuan / ton, and the cost is relatively high. Motors made of this raw material, The corresponding production cost of electrical appliances is also very high

At the same time, the proportion of pure iron powder in soft magnetic materials is 80%-90%. Since the content of iron plays an important role in soft magnetic materials, when the content of iron raw materials is lower than 90%, its magnetic saturation rate is far away. It cannot meet the performance requirements of the magnetic permeable component, directly affects the magnetic performance of the magnetic permeable component, and the magnetic permeability is also low, so it is difficult to adapt to the current continuously improving product quality requirements and market demand

In addition, when the magnetic-permeable component product is formed, the mixture "needs to be sintered in a furnace at 1100-1300°C for 2-3 hours" to meet the design requirements. Therefore, a high-temperature heating furnace with high equipment requirements must be used for processing. achieved, and the energy cost of heating to such high temperatures would be substantial

At the same time, due to the large proportion of insulating agent and lubricant in the magnetic conductive member, the size shrinkage is quite severe during forming. However, under the high temperature process environment, the physical and chemical changes caused by the insulating agent and lubricant are greater. As a result, there will be large changes in the magnetic and mechanical properties of the magnetically conductive member and the deformation of the structural size during forming, which will affect the processing quality.

The zinc stearate, soap-based grease or complex sodium cap-based grease used in the lubricant of this application cannot be completely vaporized when heated to a high temperature during the sintering process, and some will still remain in the magnetic conductive member. Affect the performance and forming accuracy of the product

In addition, after the above substances undergo chemical changes, other compounds that cannot be gasified or dissolved will remain in the sintering furnace, which often needs to be cleaned, which is troublesome and time-consuming