CN102942367A - Method for preparing heat resisting plate for processing of soft magnetic ferrite - Google Patents
Method for preparing heat resisting plate for processing of soft magnetic ferrite Download PDFInfo
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- CN102942367A CN102942367A CN2012104736570A CN201210473657A CN102942367A CN 102942367 A CN102942367 A CN 102942367A CN 2012104736570 A CN2012104736570 A CN 2012104736570A CN 201210473657 A CN201210473657 A CN 201210473657A CN 102942367 A CN102942367 A CN 102942367A
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Abstract
The invention belongs to the field of refractory material preparation and specifically relates to a method for preparing a heat resisting plate which is placed between a setter plate and a soft magnetic ferrite during processing of the soft magnetic ferrite. The method includes subjecting a ferrite and alumina to ball grinding, full mixing and drying, placing a mixture into a mold to be pressed to obtain a square blank, and sintering the square blank for 1-5 hours at the temperature of 1200-1500 DEG C, wherein the alumina and the ferrite are subjected to ball grinding and mixing for 1-3 hours according to the weight ratio of (1-10): 20, the length of a side of the square blank is 10-100mm, and the thickness of the square blank is 1-10mm. The porosity of the heat resisting plate is over 10%, so that the heat resisting plate has good heat insulation effects, the generation of cracks of the setter plate can be effectively delayed, service life of the setter plate is prolonged, and production costs of enterprises are reduced; and the heat resisting plate is good in heat stability and free from adhering to the bottom of the sintered ferrite.
Description
Technical field
The invention belongs to the refractory materials preparation field, be specifically related to a kind of preparation method who places the refractory plate between load bearing board and soft magnetic ferrite for processing during soft magnetic ferrite.
Background technology
Soft magnetic ferrite is to be formed by ferric oxide and one or more other metal oxides (such as nickel oxide, zinc oxide, manganese oxide, magnesium oxide, barium oxide, strontium oxide etc.) preparation sintering.Soft magnetic ferrite has high magnetic permeability, the advantages such as high resistivity and low-loss under high frequency.Compare with metallic magnetic, soft magnetic ferrite has higher resistivity, higher machinability, the good and low cost and other advantages of chemical stability.So be widely used in wave filter, wide-band transformer, common mode choke, the signal transfer system of various communications, transmission equipment, and the lighting transformer of daily life are in the electric ballast.Initial permeability in the soft magnetic ferrite is extremely responsive to zinc content, in sintering process, often because the scaling loss of zinc causes initial permeability to descend.The impact that the generation of zinc scaling loss oxygen in sintering temperature and stove is pressed, mainly because of being sintered contacting of magnetic core and refractory materials.When using inappropriate load bearing board material, the one side that magnetic core is in contact with it produces the out-phase crystallization, such as ZnAl
2O
4Phase, thereby affect outward appearance and the initial permeability of magnetic core product, the defective products rate that causes thus often can reach 10-50%, thereby the load bearing board that soft magnetic ferrite adopts when sintering generally can be selected load bearing board of zirconia and aluminum oxide burning plate, but the price comparison of load bearing board of zirconia is expensive, so enterprise generally can adopt aluminum oxide burning plate, but the thermal shock resistance of aluminum oxide burning plate is not so well, the too fast words of temperature rate can make its fracture, and all therefrom be interrupted, shorten the work-ing life of load bearing board, thereby increased the production cost of enterprise.And aluminum oxide burning plate chemical stability at high temperature is relatively poor, and reaction can stick together bottom sintered compact.
Summary of the invention
The purpose of this invention is to provide a kind of preparation method who places the refractory plate between load bearing board and ferrite for processing during soft magnetic ferrite, this refractory plate has good heat-shock resistance and effect of heat insulation, can prevent effectively that load bearing board is blown, prolong the work-ing life of load bearing board, reduce the production cost of enterprise.
In order to realize above technique effect, the present invention realizes as follows:
(1) ferrite and aluminum oxide being carried out ball milling also fully mixes rear dry;
(2) compound that obtains in the step (1) is put into the mould compacting and obtained square base substrate;
(3) base substrate in the step (2) is carried out sintering.
Ferrite in the described step (1) is Mn-Zn ferrite, and this ferritic purity is 90-100%, and the purity of aluminum oxide is that 90%-100%(all is weight percentage).
In the described step (1), that aluminum oxide and described ferrite is according to the ratio ball milling blend of weight ratio 1-10:20 1-3 hour, and dry under 120-150 ℃ of condition.The condition of sieving of dried mixed powder is 150 orders-400 orders.
Preferably, described aluminum oxide and described ferrite are that the ratio of 1:9 is carried out the ball milling blend according to weight proportion.
Base substrate in the described step (2) is square, and the length of side is 10-100mm, and thickness is 1-10mm.
In the described step (2), the pressure of compacting is 10-100MPa.
In the described step (3), with base substrate sintering in air, sintering temperature is 1200 ℃-1500 ℃, and sintering time is 1-5 hour.
The invention has the beneficial effects as follows: the invention provides a kind of preparation method who places the refractory plate between load bearing board and ferrite for processing during soft magnetic ferrite, the porosity of this refractory plate is greater than 10%, so have good effect of heat insulation, can effectively prevent the generation of load bearing board slight crack, prolong the work-ing life of load bearing board, reduce the production cost of enterprise; The Heat stability is good of described refractory plate, reaction does not stick together bottom iron oxygen sintered compact; Described refractory plate can make the workpiece that is in direct contact with it have good magnetic performance.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
Embodiment 1
With 900 gram manganese-zinc-ferrite powders and the alumina powder jointed self-control screw grinding machine of putting into of 100 grams, ball milling mixes 2 hours (Mn-Zn ferrite and aluminum oxide purity are all greater than 90%), dry under 120 ℃ of conditions in Constant Temp. Oven through the mixed powder behind the ball milling, the condition of sieving through dried mixed powder is 150 orders-400 orders, mixed powder is put into the mould dry-pressing, equipment is four-column hydraulic press, the pressure of compacting is 50MPa, making the length of side is 50mm, thickness is the square base substrate of 5mm, at last with base substrate chamber type electric resistance furnace Air environment sintering 2 hours, sintering temperature is 1400 ℃, makes required refractory plate.
Embodiment 2
With 800 gram manganese-zinc-ferrite powders and the alumina powder jointed self-control screw grinding machine of putting into of 200 grams, ball milling mixes 2.5 hours (Mn-Zn ferrite and aluminum oxide purity are all greater than 90%), dry under 120 ℃ of conditions in Constant Temp. Oven through the mixed powder behind the ball milling, the condition of sieving of dried mixed powder is 150 orders-400 orders, mixed powder is put into the mould dry-pressing, equipment is four-column hydraulic press, pressing pressure is 80MPa, making the length of side is 50*20mm, thickness is the square base substrate of 6mm, at last with base substrate chamber type electric resistance furnace Air environment sintering 2.5 hours, sintering temperature is 1450 ℃, makes required refractory plate.
Embodiment 3
With 850 gram manganese-zinc-ferrite powders and the alumina powder jointed self-control screw grinding machine of putting into of 150 grams, ball milling mixes 2 hours (Mn-Zn ferrite and aluminum oxide purity are all greater than 90%), dry under 130 ℃ of conditions in Constant Temp. Oven through the mixed powder behind the ball milling, the condition of sieving of dried mixed powder is 150 orders-400 orders, mixed powder is put into the mould dry-pressing, equipment is four-column hydraulic press, pressing pressure is 30MPa, making the length of side is 60mm, thickness is the square base substrate of 4.5mm, at last with base substrate chamber type electric resistance furnace Air environment sintering 3 hours, sintering temperature is 1300 ℃, makes required refractory plate.
Simultaneous test:
1000 gram manganese-zinc-ferrite powders (Mn-Zn ferrite purity is greater than 90%) are put into ball mill, ball milling mixed 2 hours, dry under 120 ℃ of conditions through the manganese-zinc-ferrite powder behind the ball milling, sieving rate through dried powder is 150 orders-400 orders, manganese-zinc-ferrite powder is put into the mould dry-pressing, the pressure of compacting is 50MPa, making the length of side is 50mm, thickness is the square base substrate of 5mm, at last with base substrate sintering 2 hours in air, sintering temperature is 1400 ℃, makes the used refractory plate of contrast experiment.
The refractory plate (being labeled as sample 1) that makes among the embodiment 1 and the refractory plate (being labeled as sample 2) that the contrast experiment makes are compared test, below are concrete test results:
1. porosity test: the porosity of sample 1 has improved 5-10% than the porosity of sample 2;
2. test on probation: at the furnace bottom common load bearing board that at first tiles, again on common load bearing board evenly tiling sample 1 or sample 2 as refractory plate, sample 1 or sample 2 above the pre-formed workpiece of placement carry out sintering.Test result under identical experiment condition shows: sample 1 has improved 75% than the use multiplicity of sample 2; At the furnace bottom common load bearing board that tiles, do not place in the situation of any refractory plate, directly on load bearing board, place the pre-burning workpiece and carry out sintering, the situation of reusing of test load bearing board, experimental result under the identical experiment condition shows: for load bearing board, placing sample 1 at load bearing board carries out sintering and has reduced by 65% than the probability of not placing any refractory plate and carry out sintering and occur slight crack, and add the adhesion phenomenon that load bearing board and sample do not appear in sample 1 at load bearing board, prolonged the work-ing life of load bearing board.
Claims (7)
1. preparation method who is used for the refractory plate of soft magnetic ferrite processing, its step comprises:
(1) ferrite and aluminum oxide being carried out ball milling also fully mixes rear dry;
(2) compound that obtains in the step (1) is put into the mould compacting and obtained square base substrate;
(3) base substrate in the step (2) is carried out sintering.
2. the preparation method of a kind of refractory plate for soft magnetic ferrite processing according to claim 1, it is characterized in that: the ferrite in the described step (1) is Mn-Zn ferrite, this ferritic purity is 90%-100%, and the purity of aluminum oxide is 90%-100%.
3. the preparation method of a kind of refractory plate for soft magnetic ferrite processing according to claim 1, it is characterized in that: in the described step (1), aluminum oxide and described ferrite is according to the ratio ball milling blend of weight ratio 1-10:20 1-3 hour, and dry under 120-150 ℃ of condition.
4. the preparation method of a kind of refractory plate for soft magnetic ferrite processing according to claim 3, it is characterized in that: described aluminum oxide and described ferritic weight proportion are 1:9.
5. the preparation method of a kind of refractory plate for soft magnetic ferrite processing according to claim 1, it is characterized in that: the base substrate in the described step (2) is square, and the length of side is 10mm-100mm, and thickness is 1mm-10mm.
6. the preparation method of a kind of refractory plate for soft magnetic ferrite processing according to claim 1, it is characterized in that: in the described step (2), the pressure of compacting is 10-100MPa.
7. the preparation method of a kind of refractory plate for soft magnetic ferrite processing according to claim 1, it is characterized in that: in the described step (3), with base substrate sintering in air, sintering temperature is 1200 ℃-1500 ℃, and sintering time is 1-5 hour.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210473657.0A CN102942367B (en) | 2012-11-20 | 2012-11-20 | Method for preparing heat resisting plate for processing of soft magnetic ferrite |
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| CN201210473657.0A CN102942367B (en) | 2012-11-20 | 2012-11-20 | Method for preparing heat resisting plate for processing of soft magnetic ferrite |
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| CN102942367A true CN102942367A (en) | 2013-02-27 |
| CN102942367B CN102942367B (en) | 2014-07-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103710001A (en) * | 2013-12-12 | 2014-04-09 | 清华大学 | Preparation method of artificial snow based on strontium ferrite |
| CN108706550A (en) * | 2018-07-03 | 2018-10-26 | 贵州大学 | A kind of technique of ardealite and red mud refractory plate coproduction acid |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202291398U (en) * | 2011-11-11 | 2012-07-04 | 麦格磁电科技（珠海）有限公司 | Saggar with ferrite sheet as combustion carrying medium |
| CN202394693U (en) * | 2011-12-12 | 2012-08-22 | 麦格磁电科技（珠海）有限公司 | Bottom ring for sintering ferrite core |
-
2012
- 2012-11-20 CN CN201210473657.0A patent/CN102942367B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202291398U (en) * | 2011-11-11 | 2012-07-04 | 麦格磁电科技（珠海）有限公司 | Saggar with ferrite sheet as combustion carrying medium |
| CN202394693U (en) * | 2011-12-12 | 2012-08-22 | 麦格磁电科技（珠海）有限公司 | Bottom ring for sintering ferrite core |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103710001A (en) * | 2013-12-12 | 2014-04-09 | 清华大学 | Preparation method of artificial snow based on strontium ferrite |
| CN108706550A (en) * | 2018-07-03 | 2018-10-26 | 贵州大学 | A kind of technique of ardealite and red mud refractory plate coproduction acid |
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| CN102942367B (en) | 2014-07-09 |
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