Soft magnetic composites are mainly made with the aid of atomization of fe-si compound. The material is ordinarily used for electric micro and small machine cores and for inductor cores. The powder can be pressed to the desired form and for that reason forming a magnetic core of preferred geometric properties.
The world manufacturing of soft magnetic composites is limited, which ends up in a relatively high material value. The price is cheaper than 0.1 mm laminated metal, but higher than 0.5 mm laminated metal.
Existing manufacturing skills ensure the specified properties and characteristics of soft magnetic composite materials due to high quality of high-priced materials – iron Powders and bonding materials, which causes a obvious increase in their price.
1. Powder is produced by way of an electrolytic approach, which gives excessive powder dispersion and well-developed dendrite structure of grain particles.
2. Instruction of powders for pressing, which incorporates their pre-firing on the temperature of 250-350℃, formation of a powder sieve shape with preset fractional dimensions, then blending it with a lubricant and plastic bonding fabric making sure maximum electrical Isolation between ferromagnetic grains.
3. Warm pressing below controlled stress and temperature of 200-450℃, which enables plastic bonding fabric to cowl the grain floor uniformly and to electrically insulate the grains among each other. The method of this level additionally affects the formation of the grain shape into very last product shape within the frame of our research we made a few specimens Of SMCs within the form of rings. The rings were prepared for microscopic analysis and some of the consequences are supplied beneath. Separate grains of various size (10÷20 um) are seen in fig. 1.
Fig.1
4. Annealing at temperatures of 1150-1250℃ gives formation of the essential grain shape inside the product and ensures the desired mechanical, electric and magnetic homes of the soft magnetic composite structure.
