CN1772709A - Soft magnetic product sintering kiln and making process - Google Patents
Soft magnetic product sintering kiln and making process Download PDFInfo
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- CN1772709A CN1772709A CN 200510037564 CN200510037564A CN1772709A CN 1772709 A CN1772709 A CN 1772709A CN 200510037564 CN200510037564 CN 200510037564 CN 200510037564 A CN200510037564 A CN 200510037564A CN 1772709 A CN1772709 A CN 1772709A
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Abstract
The present invention relates to one kind of kiln furniture for sintering soft magnetic product and its making process. The kiln furniture includes main body and outer contact layer of soft magnetic ferrite and with great amount of cracks serving as gas passage. The making process of the kiln furniture includes the following steps: soaking the sintered kiln furniture main body inside water for some time to eliminate bubbles; mixing Ni-Zn ferrite powder and 5-7 % concentration PVA aqua in the same mass ratio homogeneously; spraying the mixture onto the kiln furniture main body and drying to obtain kiln furniture blank; and final sintering the blank inside a furnace to obtain the sintered kiln furniture. The kiln furniture for sintering soft magnetic product can avoid deformation of the product caused by inhomogeneous heating and making soft magnetic product possess stable performance and good look.
Description
Technical field
The present invention relates to a kind of soft magnetic product sintering technology, particularly a kind ofly be used for used kiln furnitures and manufacture method thereof when the sintering soft magnetic product.
Background technology
At present when making soft magnetic product, for making goods obtain good surface appearance, prevent sintering warpage, used kiln furnitures produce detrimentally affect to product properties when preventing sintering, generally in sintering process, use aluminum oxide backing plate, zirconium white backing plate or on kiln furnitures, increase the Zirconium oxide powder coating, with contacting of the kiln furnitures main body of avoiding goods blank and materials such as dichroite-mullite or trichroite-corundum.But aluminum oxide or zirconium white backing plate are in use damaged easily, and cost an arm and a leg; Zirconium oxide powder is as coatings applications, though compare and to reduce cost with aluminum oxide substrate, zirconium white substrate, but after using longer for some time, the phenomenon of coating shedding can take place on the one hand, goods and zirconium white contact surface place visual appearance variation and goods electromagnetic performance instability on the other hand, and production cost is still higher.
Current manufacturing coating type soft magnetic product sintering kiln method generally is: at first burned kiln furnitures main body is placed in the water and soaks for some time; Then corresponding paint spay-coating on the kiln furnitures main body, obtain the kiln furnitures blank after the drying; At last the kiln furnitures blank is put into the firing furnace sintering.
Summary of the invention
For overcoming above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind ofly both can guarantee the soft magnetic product quality of production, again the soft magnetic product sintering kiln that can reduce production costs; Purpose of the present invention provides a kind of manufacture method of this soft magnetic product sintering kiln in addition.
For achieving the above object, the technical scheme that soft magnetic product sintering kiln structure of the present invention is adopted is: soft magnetic product sintering kiln, comprise the kiln furnitures main body, the outside of described kiln furnitures main body, be the goods contact layer with the corresponding position, position that contacts goods, the material of this goods contact layer is mainly soft magnetic ferrite and has a large amount of slits that can be used as gas passage on it.
In the above-mentioned soft magnetic product sintering kiln, described slit is a crackle, and goods contact layer inside has a large amount of tiny pores.
As preferred version, in the above-mentioned soft magnetic product sintering kiln, the soft magnetic ferrite that the main raw of described goods contact layer is identical with the goods main raw.
In order to make above-mentioned soft magnetic product sintering kiln, manufacture method of the present invention comprises the steps:
1) burned kiln furnitures main body is placed in the water soaks for some time, discharge the intravital gas of kiln furnitures master;
2) the paint spay-coating that makes be in harmonious proportion evenly by a certain percentage by soft magnetic ferrite powder and finite concentration aqueous resin solution after on the kiln furnitures main body, obtain the kiln furnitures blank after the seasoning;
3) the kiln furnitures blank is put into the firing furnace sintering, can obtain soft magnetic product sintering kiln.
In the manufacture method of above-mentioned soft magnetic product sintering kiln, described aqueous resin solution is a polyvinyl alcohol water solution.
In the manufacture method of above-mentioned soft magnetic product sintering kiln, the particle diameter of soft magnetic ferrite powder is the 1-3 micron.
In the manufacture method of above-mentioned soft magnetic product sintering kiln, the thickness of described coating is the 0.5-2 millimeter.
In the manufacture method of above-mentioned soft magnetic product sintering kiln, described polyvinyl alcohol water solution concentration is at 5-7%, and the mass ratio of soft magnetic ferrite powder and polyvinyl alcohol water solution is 1: 1.5-1: 0.7.
In this soft magnetic product sintering kiln, because the existence of a large amount of crackles of goods contact layer and a large amount of tiny pores in the goods sintering process, can make hot gas circulate below goods on the one hand, the more even uneven distortion that can keep from heat thereby therefore goods are heated; Can prevent on the other hand the goods contact layer expanded with heat and contract with cold for a long time effect influence and come off; Because of the material of goods contact layer is mainly identical with product material or close and is rich in the soft magnetic ferrite of zinc element, can avoid between goods and the kiln furnitures main body untoward reaction taking place on the one hand, can prevent the loss of zinc in the goods on the other hand, so that the performance of soft magnetic product is more stable and appearance luster is also better.
Description of drawings
This Figure of description 1 is the structural representation of an embodiment of the present invention soft magnetic product sintering kiln product.
Fig. 2 amplifies picture for the surface structure outward appearance of soft magnetic product sintering kiln of the present invention; Fig. 3 amplifies picture for its section structure.
Embodiment
Below in conjunction with embodiment the present invention is done further and to specify.
Accompanying drawing 1,2 and 3 illustrated embodiments are a kind of soft magnetic product sintering kiln that is mainly used to burn till nickel zinc soft magnetic product, it comprises kiln furnitures main body 2, the outside of described kiln furnitures main body 2, with the corresponding position, position that contacts goods for having a large amount of crackles (being so-called slit) and the inner goods contact layer 1 that has a large amount of tiny pores, the material of this goods contact layer 1 is mainly nickel-zinc ferrite.
The manufacture method of above-mentioned nickel zinc soft magnetic product sintering kiln mainly comprises the steps:
1. the kiln furnitures main body of burned dichroite-mullite matter is placed in the water and soaks for some time; Purpose is that the intravital gas of kiln furnitures master is discharged as far as possible, avoiding coating foaming behind next step spray-on coating, thereby causes coating and kiln furnitures main body bonding not firm and coatingsurface is too coarse.
2. compound concentration is the polyvinyl alcohol water solution of 5-7%, and method is: earlier polyvinyl alcohol is added in the entry, use the heated and stirred machine to stir, temperature is controlled at 90-100 degree centigrade, forms water white polyvinyl alcohol water solution.The concentration of polyvinyl alcohol water solution can change between 1-10% in fact, just concentration is low more, has then reduced the viscosity of polyvinyl alcohol water solution, has weakened the tension force of polyvinyl alcohol, the coating inner pore reduces relatively after making moisture drying, and is unfavorable to solving product deformation; The high more viscosity that then improves polyvinyl alcohol water solution of concentration has strengthened the tension force of polyvinyl alcohol, is unfavorable for making that coating inner pore and surface crack increase increase relatively behind the moisture drying, makes coating shedding and coatingsurface too coarse easily.
3. be particle diameter that 1 to 3 micron nickel-zinc ferrite powder and concentration is the polyvinyl alcohol water solution of 5-7%, be in harmonious proportion evenly, be sprayed on the kiln furnitures main body coat-thickness 0.5-2 millimeter then according to 1: 1 mass ratio.The particle diameter of nickel-zinc ferrite powder is not must be at the 1-3 micron in fact; Just generally speaking, when this scope, the situation that generates crackle and pore in the final coating is relative better.The ratio of nickel-zinc ferrite powder and 5-7% polyvinyl alcohol water solution can be 1: 1.5-1: change between 0.7; When the concentration of polyvinyl alcohol water solution is between 1-10%, can find suitable proportioning between nickel-zinc ferrite powder and the polyvinyl alcohol water solution with comparalive ease by the method for test.
4. coating soft magnetic product sintering kiln seasoning for some time of coating, be generally 12～72 hours, have certain intensity to coating curing, and the surface forms a large amount of crackles, coating inside also can produce some pores, obtains the kiln furnitures blank.The exsiccant principle is to utilize polyvinyl alcohol water solution moisture again can slow release in dry air, and the shared volume of original moisture is vacated and under the effect of polyvinyl alcohol tensile, and coating curing, coatingsurface form a large amount of minute cracks and innerly form a large amount of pores.Can adopt the way of low-temperature bake when dry in fact, but rate of drying should be too not fast yet; Otherwise can cause problems such as coating crack is too big, coatingsurface is too coarse and coating comes off easily.Concrete rate of drying also can be grasped by the method for test; Also can toast after first seasoning for some time when dry, seasoning should make coating lose certain moisture again, and coating has certain intensity, and internal moisture is removed in baking about 100 degrees centigrade then, further makes coating curing; But the forced drying of generally should manually not drying, otherwise it is too fast that coatingsurface moisture is lost causes in the coating table moisture content seriously unbalance easily, and the peeling fold appears in coatingsurface, and coating is made failure.
5. the kiln furnitures blank is put into push-plate type firing furnace sintering, obtain soft magnetic product sintering kiln; The agglomerating temperature condition is identical with the common goods sintering situation of same material with time conditions, and all can change within the specific limits according to the variation of other condition, and the general desirable 1000-1250 of sintering temperature degree centigrade, general desirable 6-15 of time hour.In sintering process, pure solid phase takes place or has the solid state reaction of minute quantity liquid phase in soft magnetic ferrite powder, make between the soft magnetic ferrite powder and and the kiln furnitures main body between bond together securely; Simultaneously, coating gas inside, residual moisture and polyvinyl alcohol can volatilize under heat effect in gasification, pressure to coating during volatilization further increases, the interior original pore of coating can enlarge and can produce many new pores, thereby a large amount of pore networks in the formation coating, coatingsurface also produces a large amount of crackles.
Soft magnetic product sintering kiln and its manufacture method of being mainly used to burn till nickel zinc soft magnetic product have been narrated above, being mainly used to burn till the soft magnetic product sintering kiln of MnZn class soft magnetic product and being mainly used to burn till structure and the aforementioned soft magnetic product sintering kiln structure of soft magnetic product sintering kiln of magnesium zinc class soft magnetic product basic identical, is that goods contact layer main raw preferably changes corresponding Mn-Zn ferrite or MgZn ferrite into; Correspondingly the nickel-zinc ferrite powder will change corresponding manganese-zinc ferrite powder or MgZn ferrite powder in the manufacture method, and the parameters such as temperature during sintering kiln furnitures blank are also done corresponding adjustment.Generally speaking, the Mn-Zn ferrite corresponding temperature is at 1250-1400 degree centigrade, and the MgZn ferrite temperature is at 1200-1380 degree centigrade.
The characteristics of soft magnetic ferrite coating type soft magnetic product sintering kiln of the present invention:
1. the structure that has the pore network makes coating can solve soft magnetic ferrite goods sintering warpage problem, improves sintering finished rate; And coating difficult drop-off.
2. the existence of goods contact layer has avoided the soft magnetic ferrite goods directly to contact with soft magnetic product sintering kiln, prevents the zinc loss in the goods, thereby helps the stable of soft magnetic ferrite goods magnetic property.
3. compare with existing zirconia coating type sintering kiln, soft magnetic product sintering kiln in use can guarantee goods sintering quality and good article rate, the coating difficult drop-off, and can reduce cost significantly.
4. low production cost can use the waste-powder that reclaims aborning of identical type or soft magnetic ferrite goods that depleted does not burn till to make the starting material of powder as coating.As MnZn class ferrite product sintering kiln, the Mn-Zn ferrite goods that can use the discarded manganese-zinc ferrite powder that reclaims in the production or depleted not to burn till are made powder as coating material.
The present invention is not limited only to above-mentioned concrete embodiment, evenly is in harmonious proportion as the polyvinyl alcohol water solution and the water that also can change the even mediation of the polyvinyl alcohol water solution of nickel-zinc ferrite powder and 5-7% into the respective amount high density; Described in addition aqueous resin solution is except that adopting polyvinyl alcohol, also can adopt other resins, as polyvinyl acetate (PVA), water soluble amino resin, they can realize infinite dilution with water, can reach the viscosity requirement by the quality that changes water, all rely on the tension force of the volatilization of moisture and resin self and make coating curing, form crackle and pore.
Claims (8)
1. soft magnetic product sintering kiln, comprise the kiln furnitures main body, it is characterized in that: the outside of described kiln furnitures main body, be the goods contact layer with the corresponding position, position that contacts goods, the material of this goods contact layer is mainly soft magnetic ferrite and has a large amount of slits that can be used as gas passage on it.
2. soft magnetic product sintering kiln as claimed in claim 1 is characterized in that: described slit is a crackle, and goods contact layer inside has a large amount of tiny pores.
3. soft magnetic product sintering kiln as claimed in claim 1 or 2 is characterized in that: the soft magnetic ferrite that the main raw of described goods contact layer is identical with the goods main raw.
4. the manufacture method of a soft magnetic product sintering kiln as claimed in claim 1 comprises the steps:
1) burned kiln furnitures main body is placed in the water soaks for some time, discharge the intravital gas of kiln furnitures master;
2) corresponding paint spay-coating on the kiln furnitures main body, obtain the kiln furnitures blank after the seasoning;
3) the kiln furnitures blank is put into the firing furnace sintering, can obtain soft magnetic product sintering kiln;
It is characterized in that:
Described coating makes after being in harmonious proportion evenly by a certain percentage by soft magnetic ferrite powder and finite concentration aqueous resin solution; Paint spay-coating slowly obtains the kiln furnitures blank after the drying after on the kiln furnitures main body.
5. the manufacture method of soft magnetic product sintering kiln as claimed in claim 4, it is characterized in that: described aqueous resin solution is a polyvinyl alcohol water solution.
6. the manufacture method of soft magnetic product sintering kiln as claimed in claim 4, it is characterized in that: the particle diameter of soft magnetic ferrite powder is the 1-3 micron.
7. the manufacture method of soft magnetic product sintering kiln as claimed in claim 4, it is characterized in that: the thickness of described coating is the 0.5-2 millimeter.
8. the manufacture method of soft magnetic product sintering kiln as claimed in claim 5, it is characterized in that: described polyvinyl alcohol water solution concentration is at 5-7%, and the mass ratio of soft magnetic ferrite powder and polyvinyl alcohol water solution is 1: 1.5-1: 0.7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100375643A CN100526261C (en) | 2005-09-28 | 2005-09-28 | Soft magnetic product sintering kiln and making process |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100375643A CN100526261C (en) | 2005-09-28 | 2005-09-28 | Soft magnetic product sintering kiln and making process |
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| CN1772709A true CN1772709A (en) | 2006-05-17 |
| CN100526261C CN100526261C (en) | 2009-08-12 |
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| CNB2005100375643A Expired - Fee Related CN100526261C (en) | 2005-09-28 | 2005-09-28 | Soft magnetic product sintering kiln and making process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102079657A (en) * | 2009-11-27 | 2011-06-01 | 韦国文 | Method for producing and preparing high-aluminum setter plate kiln furniture with high thermal shock resistance |
| CN106431423A (en) * | 2015-08-11 | 2017-02-22 | 无锡顺佳特种陶瓷有限公司 | Zirconia coating layer for saggar and preparation method of saggar |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538477A (en) * | 2011-12-30 | 2012-07-04 | 江苏三恒高技术窑具有限公司 | Rough surface coated kiln furniture for kilning electronic components |
-
2005
- 2005-09-28 CN CNB2005100375643A patent/CN100526261C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102079657A (en) * | 2009-11-27 | 2011-06-01 | 韦国文 | Method for producing and preparing high-aluminum setter plate kiln furniture with high thermal shock resistance |
| CN102079657B (en) * | 2009-11-27 | 2014-10-08 | 韦国文 | Method for producing and preparing high-aluminum setter plate kiln furniture with high thermal shock resistance |
| CN106431423A (en) * | 2015-08-11 | 2017-02-22 | 无锡顺佳特种陶瓷有限公司 | Zirconia coating layer for saggar and preparation method of saggar |
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| Publication number | Publication date |
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| CN100526261C (en) | 2009-08-12 |
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Address after: Two street in Guangdong city of Dongguan Province Huang Huang Huang Jiang Town Village No. 1 2 floor Patentee after: Xiang Chaoxia Address before: Guangdong city of Dongguan province Changan Zhen Xiao Bian Cun Plainvim electronics factory Patentee before: Xiang Chaoxia |
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Granted publication date: 20090812 Termination date: 20100928 |