CN102503388B - Method for reducing firing shrinkage of strontium ferrite magnetic material, and product prepared by method - Google Patents
Method for reducing firing shrinkage of strontium ferrite magnetic material, and product prepared by method Download PDFInfo
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- CN102503388B CN102503388B CN 201110282199 CN201110282199A CN102503388B CN 102503388 B CN102503388 B CN 102503388B CN 201110282199 CN201110282199 CN 201110282199 CN 201110282199 A CN201110282199 A CN 201110282199A CN 102503388 B CN102503388 B CN 102503388B
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Abstract
The invention discloses a method for reducing firing shrinkage of a strontium ferrite magnetic material, and a product prepared by the method. According to the method, partial ferric oxide powder can be replaced by hydroxy iron powder or reduced iron powder to change the formula composition, such that the firing shrinkage of the ferrite magnetic material is controlled so as to reduce the firing deformation rate of the product. According to the present invention, the deformation amount of the prepared product is small, the post-processing amount is small or the post-processing is not required, the product qualification rate is high, the production cost is reduced, and the method is suitable for the industrial mass production.
Description
Technical field
The invention belongs to field of inorganic materials, be specifically related to a kind of method of firing shrinkage of strontium ferrite magnetic material and product that makes thereof of reducing.
Background technology
Ferrite is important magnetic function stupalith, all has a wide range of applications in fields such as modern industry, hi-techs as component.Ferritic percent of firing shrinkage is larger, change with manufacturing process and raw material granularity, shrinking percentage changes, generally be in 10%～25% shrinking percentage scope, larger percent of firing shrinkage directly causes deformation of products, be difficult to reach the accuracy requirement of component fitted position, often need to carry out the post-treatment processing such as grinding, cutting, polishing to burning rear product.In the post-treatment process, the amount of finish that is out of shape large product needed is also large, and Ferrite Material hardness is higher, and property is crisp, the post-treatment difficulty, and cost is high.
At present, focus mostly at the aspects such as ferrite product manufacture method of the performance that improves ferrite magnetic material, reduction firing temperature, specified shape, performance about ferritic Chinese patent, the correlation technique of controlling the ferrite percent of firing shrinkage loses patent report.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of with carbonyl iron particles and the method for reduced iron powder replacement part ferric oxide powder reduction firing shrinkage of strontium ferrite magnetic material and the product that makes thereof.
for solving above technical problem, technical scheme of the present invention is: a kind of method that reduces firing shrinkage of strontium ferrite magnetic material, adopt industrial chemicals and ferric oxide powder, through batching, ball milling, batch mixing, moulding, base substrate precision work, burn till and obtain the iron strontium oxide magnetic product, in the maintenance composition of raw materials, iron level is constant, replace part ferric oxide powder with carbonyl iron particles and reduced iron powder, described raw material is after ball milling operation median size reaches 10 μ m, adding median size in compounding process is that carbonyl iron particles and the median size of 1 μ m is the reduced iron powder of 15 μ m, its firing temperature is in 200～900 ℃ of intervals, heat-up rate≤50 ℃/hour, the water-intake rate of product≤0.5% after sintering.
Described carbonyl iron particles addition is 10～30wt%.
Described reduced iron powder addition is 10～20wt%, and its Fe 〉=98%, carbon≤0.01%, p and s are all less than 0.03%, and hydrogen loss is 0.1～0.2%.
The iron strontium oxide magnetic product that aforesaid method makes burns till post-shrinkage ratio≤5%.
Advantage of the present invention shows: by adjusting the formula of ferrite magnetic material, reduce ferrite product and burn till to shrink or reach nearly zero and shrink, namely the size of the size of ferrite product, precision and base substrate, precision are suitable.Therefore, only need process the high base substrate of dimensional precision just can directly obtain the product of high dimensional accuracy, has realized simply, at low cost the production of high precision ferrite component.
Modern industry and high-tech sector improve day by day to the requirement of the physical dimension of ferrite product, produce greatly distortion because burning till to shrink, the problem that causes product percent of pass to descend is day by day serious, because deformation of products causes greatly amount of finish large, special shape ferrite product post-treatment difficulty, the crisp rapid wear of product is frangible, and the high in cost of production problem is fairly obvious.The present invention solves these problems dexterously, and not only production has good realistic meaning to ferrite product, and the firing technology of stupalith is had obvious theory directive significance.
In addition, adopt the present invention to prepare ferrite product, its preparation process and conventional iron oxysome product preparation process are basic identical, simple and easy to control.The performance of prepared Ferrite Material is identical with the performance of the Ferrite Material that adopts oxide compound batching and ferritic traditional preparation technology's preparation.
Embodiment
Embodiment 1
The according to the form below weight percent forms, take Strontium carbonate powder, ferric oxide, Strontium Sulphate, Calcium Fluoride (Fluorspan) and plumbous oxide, add the methylcellulose gum of 0.5wt%, after wet ball grinding, add carbonyl iron particles and reduced iron powder by formula, mix, mist projection granulating, dry-pressing formed, dry, refine base, burn till the acquisition goods.
| Strontium carbonate powder | Ferric oxide | Calcium Fluoride (Fluorspan) | Strontium Sulphate | Plumbous oxide | Iron carbonyl | Reduced iron |
| 18.08 | 46.43 | 1.17 | 1.57 | 0.69 | 16.80 | 15.26 |
Wherein the part processing parameter is: Ball-milling Time: 36～48 hours, reach 10 μ m with the median size of powder and be as the criterion; Mixing time: 2 hours; The ball shaped hydroxy iron powder: the size-grade distribution interval is narrow, and good fluidity, tap density are high; Forming pressure: 30MPa; Calcining system: 200 ℃～900 ℃ heat-up rates are 50 ℃/hour, and maximum sintering temperature is 1320 ℃, are incubated 2 hours.
The iron strontium oxide magnetic product that makes burns till post-shrinkage ratio approximately 0%.
Embodiment 2
The according to the form below weight percent forms, take Strontium carbonate powder, ferric oxide, Strontium Sulphate, Calcium Fluoride (Fluorspan) and plumbous oxide, add the methylcellulose gum of 0.5wt%, after wet ball grinding, add carbonyl iron particles and reduced iron powder by formula, mix, mist projection granulating, dry-pressing formed, dry, refine base, burn till the acquisition goods.
| Strontium carbonate powder | Ferric oxide | Calcium Fluoride (Fluorspan) | Strontium Sulphate | Plumbous oxide | Iron carbonyl | Reduced iron |
| 21.08 | 43.43 | 1.17 | 1.47 | 0.79 | 19.80 | 12.26 |
Wherein the part processing parameter is: Ball-milling Time: 36～48 hours, reach 10 μ m with the median size of powder and be as the criterion; Mixing time: 2 hours; The ball shaped hydroxy iron powder: the size-grade distribution interval is narrow, and good fluidity, tap density are high; Forming pressure: 30MPa; Calcining system: 200 ℃～900 ℃ heat-up rates are 50 ℃/hour, and maximum sintering temperature is 1320 ℃, are incubated 2 hours.
It is 2% that the iron strontium oxide magnetic product that makes burns till post-shrinkage ratio.
Claims (2)
1. method that reduces firing shrinkage of strontium ferrite magnetic material, adopt industrial chemicals and ferric oxide powder, through batching, ball milling, batch mixing, moulding, base substrate precision work, burn till and obtain the iron strontium oxide magnetic product, it is characterized in that: in the maintenance composition of raw materials, iron level is constant, replace part ferric oxide powder with carbonyl iron particles and reduced iron powder, described raw material is after ball milling operation median size reaches 10 μ m, adding median size in compounding process is that carbonyl iron particles and the median size of 1 μ m is the reduced iron powder of 15 μ m, its firing temperature is in 200～900 ℃ of intervals, heat-up rate≤50 ℃/hour, the water-intake rate of product≤0.5% after sintering, described carbonyl iron particles addition is 10～30wt%, described reduced iron powder addition is 10～20wt%, and its Fe 〉=98%, carbon≤0.01%, p and s are all less than 0.03%, and hydrogen loss is 0.1～0.2%.
2. iron strontium oxide magnetic product that is made by the described method of claim 1, it is characterized in that: described iron strontium oxide magnetic product burns till post-shrinkage ratio≤5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110282199 CN102503388B (en) | 2011-09-21 | 2011-09-21 | Method for reducing firing shrinkage of strontium ferrite magnetic material, and product prepared by method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110282199 CN102503388B (en) | 2011-09-21 | 2011-09-21 | Method for reducing firing shrinkage of strontium ferrite magnetic material, and product prepared by method |
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| CN102503388A CN102503388A (en) | 2012-06-20 |
| CN102503388B true CN102503388B (en) | 2013-06-05 |
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| CN 201110282199 Expired - Fee Related CN102503388B (en) | 2011-09-21 | 2011-09-21 | Method for reducing firing shrinkage of strontium ferrite magnetic material, and product prepared by method |
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| CN106396658B (en) * | 2016-09-05 | 2019-10-15 | 中南大学 | A kind of method that solid phase reaction prepares spinel type ferrite material precursor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1458913A (en) * | 2001-02-08 | 2003-11-26 | 住友电气工业株式会社 | Porous ceramic and method for prepartion thereof and microstrip substrate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1458913A (en) * | 2001-02-08 | 2003-11-26 | 住友电气工业株式会社 | Porous ceramic and method for prepartion thereof and microstrip substrate |
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