CN100389212C - Heat Treatment Process and Device for Amorphous and Nanocrystalline Alloy Iron Core - Google Patents

Abstract

The invention discloses a heat treatment process of an amorphous and nanocrystalline alloy iron core with a Br value and a high squareness ratio and a device with a simple structure. The process steps are: put the gold iron core on the U-shaped non-magnetic conductive rod and place it in a heating furnace for heat treatment. The core applies a longitudinal magnetic field. The device includes a furnace body, a furnace cover, and several U-shaped non-magnetic conductive rods arranged in the inner cavity of the furnace body. The several U-shaped conductive rods are connected in series to form a similar In the serpentine conductive rod.

Description

Heat Treatment Process and Device for Amorphous and Nanocrystalline Alloy Iron Core

technical field

The invention relates to a heat treatment for an iron core of an inductive device, in particular to a heat treatment process and device for an amorphous or nanocrystalline alloy iron core.

Existing technology The domestic use of amorphous and nanocrystalline alloys as materials, using ordinary processing methods and ordinary processing equipment to produce magnetic amplifier cores for power supplies, has a low Br value and squareness ratio (Br/Bm) < 90 %, this type of iron core is difficult to meet the requirements of high-end power supply.

Contents of the invention

The object of the present invention is to provide a heat treatment process and device for an amorphous and nanocrystalline alloy iron core with a high Br value and a high squareness ratio, aiming at the problems existing in the above-mentioned prior art.

The heat treatment process of the present invention comprises the following steps: putting several ring-shaped amorphous and nanocrystalline alloy iron cores on the non-magnetic conductor and placing them in a heating furnace to heat up at the rate of the existing technology, and start to heat up to 85--95 minutes , When the amorphous alloy iron core reaches 300--400°C and the nanocrystalline alloy iron core reaches 350-520°C, carry out the first 10-120 minutes of heat preservation at this temperature, and then carry out the second 30-120 minutes of heating And reach the required heat treatment temperature: after the amorphous alloy iron core is 400-495°C and the nanocrystalline alloy iron core is 490-590°C, start to use this temperature for the second 20-120 minutes of heat preservation. While starting to keep warm, connect both ends of the above-mentioned non-magnetic conductive conductor to a power supply with a current of 20-180A, and apply a thin strip used for winding the iron core to the iron core that is sheathed on the non-magnetic conductive conductor. The same magnetic field in the length direction of the material, after that, stop heating and cool down to 140-160°C with the furnace to complete the heat treatment. The temperature difference in the inner chamber of the furnace is less than 3°C.

Described first time start heat preservation time is 90 minutes after starting to heat up, first time and second time heat preservation time are respectively 30 and 60 minutes, second time heat preservation time is 60 minutes, first time and second time heat preservation temperature respectively For: amorphous alloy iron core 300 ℃ and 485 ℃, nanocrystalline alloy iron core 385 ℃ and 550 ℃, remove the magnetic field when the iron core is cooled to 150 ℃.

The iron cores to be processed are axially stacked on the non-magnetic conductive conductor; the magnetizing power supply is an alternating current or direct current power supply.

The alloy iron core heat treatment device includes a furnace body and a furnace cover. It is characterized in that the inner chamber of the furnace is provided with a non-magnetic conductor for passing through the alloy core to be processed, and the non-magnetic conductor is The two ends are led out of the furnace body to be connected with the power supply line.

The non-magnetic conducting body is composed of several elongated or U-shaped non-magnetic conducting rods connected in series. Fixed on the furnace cover or furnace body.

The non-magnetic conducting conductors are composed of several elongated or U-shaped rods connected in series, and each group has multiple groups of non-magnetic conducting conductors with two ends at the beginning and the end. The multiple groups of non-magnetic conducting conductors each The first and last two ends of the group are connected separately or in parallel with each other and then lead out to connect with the power supply.

The furnace cover is provided with installation openings suitable for the thickness of the conductive rods.

The heat treatment device of the present invention comprises

The device used in the present invention is simple in structure, easy to install and use, and has a large batch of iron cores to be processed at one time. The iron core is subjected to a longitudinal magnetic field for heat treatment by using this process and the device. The Br value and squareness ratio of the processed alloy iron core are high. The ratio reaches 95% - 99%. It is used in the production of saturable cores such as magnetic amplifiers and spike suppressor cores.

Description of drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention. Fig. 2 is a schematic diagram of the direction in which the magnetic field acts on the iron core. Fig. 3 is a temperature curve diagram of a process embodiment of the present invention.

Detailed ways

As shown in Figure 1, several non-magnetic conduction rods 3 are erected in the inner cavity of the garden barrel-shaped furnace body 1, and the annular cobalt-based amorphous alloy iron core 5 that needs heat treatment is put on each of the conductive rods 3, The open end of each conductive rod 3 protrudes from the furnace cover 4, and is fixed on the furnace cover 4 through the fixed seal 2, and each conductive rod 3 is connected in series with a wire 6 from the end of the rod to form a serpentine-like wire , the first and last ends 3-a, 3-b of the serpentine wire are connected to the magnetic power supply.

Put the ring-shaped cobalt-based amorphous alloy iron core 5 to be processed on each conductive rod 3 through its central hole, install it in the furnace, use the heating rate of the existing technology, start heating from normal temperature to 90 minutes, and the temperature reaches 350 ℃, heat at this temperature for 30 minutes, then continue to heat up for 60 minutes, and when the temperature reaches 485°C, use this temperature for a second heat preservation for 60 minutes. The heads 3-a and 3-b are connected to a 60A AC or DC power supply, and a longitudinal magnetic field is applied to the iron core 5. After the second heat preservation is completed, the heating source of the heat treatment furnace is removed, and the iron core 5 in the furnace is cooled to 150°C with the furnace. , cut off the current of the serpentine conductive rod and remove the magnetic field to complete the heat treatment process.

For the above heat treatment process for the iron-based nanocrystalline alloy core, the primary heat preservation temperature is 490°C, the secondary heat preservation temperature is 550°C, and the rest are the same as the heat treatment process for the cobalt-based amorphous alloy core.

As shown in FIG. 2 , when the serpentine conductive wire 3 passing through the inner hole of the iron core 5 is supplied with current, the direction of the magnetic flux 9 generated by it is axial around the iron core 5 .

In FIG. 3 , 8 is the cobalt-based amorphous alloy iron core, and 7 is the temperature curve of the iron-based nanocrystalline alloy iron core.

Claims (6)

1. the thermal treatment process of an amorphous alloy iron core is characterized in that comprising the steps:

Annular amorphous alloy iron core being set on the electrical conductor of non-magnetic conduction places process furnace to heat up by prior art speed, began to be warming up to 85--95 minute, when temperature reaches 300--400 ℃, carry out 10-120 minute insulation for the first time with this temperature, carry out again afterwards being warming up to the 30-120 minute second time after required thermal treatment temp 400-495 ℃, begin to carry out the insulation of 20-160 branch clock time for the second time with this temperature, when beginning to be incubated, the electrical conductor two ends of above-mentioned non-magnetic conduction are inserted the power supply of 20-180A electric current, iron core on the electrical conductor that is set in this non-magnetic conduction is applied its direction and the identical magnetic field of thin strip length direction that is used for Wound core, afterwards, stop heating and cool to 140-160 ℃ with the furnace, finish thermal treatment; Burner hearth cavity everywhere temperature head less than 3 ℃.

2. according to the described thermal treatment process of claim 1, it is characterized in that beginning the described first time soaking time for beginning to heat up back 90 minutes, for the first time and for the second time soaking time was respectively 30 and 60 minutes, heating-up time is 60 minutes for the second time, for the first time and for the second time holding temperature is respectively: 300 ℃ and 485 ℃, iron core removes magnetic field when being cooled to 150 ℃, finishes thermal treatment.

3. by the described thermal treatment process of claim 1, it is characterized in that on the axially stacked mutually electrical conductor that is set in non-magnetic conduction of iron core that desire handles; The power supply that is used to produce described magnetic field is alternating-current or direct supply.

4. the thermal treatment process of a nano-crystalline alloy iron core is characterized in that comprising the steps:

Circular nano peritectic alloy iron core being set on the electrical conductor of non-magnetic conduction places process furnace to heat up by prior art speed, begin to be warming up to 85--95 minute, when temperature reaches 350-520 ℃, carry out 10-120 minute insulation for the first time with this temperature, carrying out afterwards heating up the 30-120 minute second time reaches after required thermal treatment temp 490-590 ℃ again, begins to carry out the insulation of 20-160 branch clock time for the second time with this temperature.When beginning to be incubated, the electrical conductor two ends of above-mentioned non-magnetic conduction are inserted the power supply of 20-180A electric current, iron core on the electrical conductor that is set in this non-magnetic conduction is applied its direction and the identical magnetic field of thin strip length direction that is used for Wound core, afterwards, stop heating and cool to 140-160 ℃ with the furnace, finish thermal treatment; Burner hearth cavity everywhere temperature head less than 3 ℃.

5. according to the described thermal treatment process of claim 4, it is characterized in that beginning the described first time soaking time for beginning to heat up back 90 minutes, for the first time and for the second time soaking time was respectively 30 and 60 minutes, heating-up time is 60 minutes for the second time, for the first time and for the second time holding temperature is respectively: 350 ℃ and 550 ℃, iron core removes magnetic field when being cooled to 150 ℃, finishes thermal treatment.

6. by the described thermal treatment process of claim 4, it is characterized in that on the axially stacked mutually electrical conductor that is set in non-magnetic conduction of iron core that desire handles; The power supply that is used to produce described magnetic field is alternating-current or direct supply.

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