CN102942367B - 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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- CN102942367B CN102942367B CN201210473657.0A CN201210473657A CN102942367B CN 102942367 B CN102942367 B CN 102942367B CN 201210473657 A CN201210473657 A CN 201210473657A CN 102942367 B CN102942367 B CN 102942367B
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- ferrite
- soft magnetic
- magnetic ferrite
- heat resisting
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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 refractory materials preparation field, be specifically related to a kind of preparation method who is placed in the refractory plate between load bearing board and soft magnetic ferrite when processing soft magnetic ferrite.
Background technology
Soft magnetic ferrite is for example, to be formed by ferric oxide and one or more other metal oxides (: 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.Compared 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, in electric ballast.
Initial permeability in soft magnetic ferrite is extremely responsive to zinc content, in sintering process, often declines because the scaling loss of zinc causes initial permeability.The generation of the zinc scaling loss impact that oxygen is pressed in sintering temperature and stove, mainly because of being sintered contacting of magnetic core and refractory materials.When using inappropriate load bearing board material, often make the one side that magnetic core is in contact with it produce out-phase crystallization, as ZnAl
2o
4phase, thereby affect outward appearance and the initial permeability of magnetic core product, the defective products rate causing thus often can reach 10-50%, thereby the load bearing board that soft magnetic ferrite adopts in the time of sintering generally can be selected load bearing board of zirconia and aluminum oxide burning plate, but the price comparison costliness of load bearing board of zirconia, 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 be all therefrom interrupted, shorten the work-ing life of load bearing board, thereby increased the production cost of enterprise.And aluminum oxide burning plate chemical stability is at high temperature poor, can sticks together and react with sintered compact bottom.
Summary of the invention
The object of this invention is to provide a kind of preparation method who is placed in the refractory plate between load bearing board and ferrite when processing soft magnetic ferrite, this refractory plate has good heat-shock resistance and effect of heat insulation, can effectively prevent that load bearing board is blown, extend 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) by aluminum oxide and ferrite according to the ratio ball milling blend 1-3 hour of weight ratio 1-10:20, and dry under 120-150 DEG C of condition.The condition of sieving of dried mixed powder is 150 order-400 orders;
(2) compound obtaining in step (1) is put into mould compacting and obtained square base substrate;
(3) base substrate in step (2) is carried out to sintering.
Ferrite in described step (1) is Mn-Zn ferrite, and this ferritic purity is 90-100%, and the purity of aluminum oxide is that 90%-100%(is all weight percentage).
Base substrate in described step (2) is square, and the length of side is 10-100mm, and thickness is 1-10mm.
In described step (2), the pressure of compacting is 10-100MPa.
In described step (3), by base substrate sintering in air, sintering temperature is 1200 DEG C-1500 DEG C, and sintering time is 1-5 hour.
The invention has the beneficial effects as follows: the invention provides a kind of preparation method who is placed in the refractory plate between load bearing board and ferrite when processing soft magnetic ferrite, the porosity of this refractory plate is greater than 10%, so there is good effect of heat insulation, can effectively prevent the generation of load bearing board slight crack, extend the work-ing life of load bearing board, reduce the production cost of enterprise; The Heat stability is good of described refractory plate, does not stick together and reacts with iron oxygen sintered compact bottom; Described refractory plate can make the workpiece being in direct contact with it have good magnetic performance.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
Embodiment 1
By 900 grams of manganese-zinc-ferrite powders and 100 grams of alumina powder jointed self-control screw grinding machines of putting into, ball milling mixes 2 hours (Mn-Zn ferrite and aluminum oxide purity are all greater than 90%), mixed powder after ball milling is dry under 120 DEG C of conditions in Constant Temp. Oven, the condition of sieving through dried mixed powder is 150 order-400 orders, mixed powder is put into 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, finally by base substrate air ambient sintering 2 hours in chamber type electric resistance furnace, sintering temperature is 1400 DEG C, make required refractory plate.
Embodiment 2
By 800 grams of manganese-zinc-ferrite powders and 200 grams of alumina powder jointed self-control screw grinding machines of putting into, ball milling mixes 2.5 hours (Mn-Zn ferrite and aluminum oxide purity are all greater than 90%), mixed powder after ball milling is dry under 120 DEG C of conditions in Constant Temp. Oven, the condition of sieving of dried mixed powder is 150 order-400 orders, mixed powder is put into 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, finally by base substrate air ambient sintering 2.5 hours in chamber type electric resistance furnace, sintering temperature is 1450 DEG C, make required refractory plate.
Embodiment 3
By 850 grams of manganese-zinc-ferrite powders and 150 grams of alumina powder jointed self-control screw grinding machines of putting into, ball milling mixes 2 hours (Mn-Zn ferrite and aluminum oxide purity are all greater than 90%), mixed powder after ball milling is dry under 130 DEG C of conditions in Constant Temp. Oven, the condition of sieving of dried mixed powder is 150 order-400 orders, mixed powder is put into 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, finally by base substrate air ambient sintering in chamber type electric resistance furnace 3 hours, sintering temperature is 1300 DEG C, make required refractory plate.
Simultaneous test:
1000 grams of manganese-zinc-ferrite powders (Mn-Zn ferrite purity is greater than 90%) are put into ball mill, ball milling mixes 2 hours, manganese-zinc-ferrite powder after ball milling is dry under 120 DEG C of conditions, sieving rate through dried powder is 150 order-400 orders, manganese-zinc-ferrite powder is put into mould dry-pressing, the pressure of compacting is 50MPa, making the length of side is 50mm, thickness is the square base substrate of 5mm, finally by base substrate sintering 2 hours in air, sintering temperature is 1400 DEG C, makes contrast experiment's refractory plate used.
The refractory plate making in embodiment 1 (being labeled as sample 1) and the refractory plate (being labeled as sample 2) that contrast experiment makes are carried out to contrast test, are below 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 first tiles, more evenly tiling sample 1 or sample 2, as refractory plate, are placed pre-formed workpiece at sample 1 or above sample 2 and carried out sintering on common load bearing board.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 pre-burning workpiece and carry out sintering, the situation of reusing of test load bearing board, experimental result under identical experiment condition shows: for load bearing board, on load bearing board, placing sample 1 carries out sintering and occurs that than not placing any refractory plate and carrying out sintering the probability of slight crack has reduced by 65%, and on load bearing board, add the adhesion phenomenon that load bearing board and sample do not appear in sample 1, extended the work-ing life of load bearing board.
Claims (4)
1. a preparation method for the refractory plate of processing for soft magnetic ferrite, its step comprises:
(1) by aluminum oxide and ferrite according to the ratio ball milling blend 1-3 hour of weight ratio 1-10:20, and dry under 120-150 DEG C of condition;
(2) compound obtaining in step (1) is put into mould compacting and obtained square base substrate;
(3) base substrate in step (2) is carried out to sintering in air, sintering temperature is 1200 DEG C-1500 DEG C, and sintering time is 1-5 hour.
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 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, is characterized in that: the base substrate in described step (2) is square, and the length of side is 10mm-100mm, and thickness is 1mm-10mm.
4. the preparation method of a kind of refractory plate for soft magnetic ferrite processing according to claim 1, is characterized in that: in described step (2), the pressure of compacting is 10-100MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
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| CN102942367A CN102942367A (en) | 2013-02-27 |
| CN102942367B true CN102942367B (en) | 2014-07-09 |
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| CN201210473657.0A Expired - Fee Related CN102942367B (en) | 2012-11-20 | 2012-11-20 | Method for preparing heat resisting plate for processing of soft magnetic ferrite |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103710001B (en) * | 2013-12-12 | 2014-12-24 | 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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| 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 |
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