CN102674822B - Injection molding granules for ferrite cores and production method thereof - Google Patents
Injection molding granules for ferrite cores and production method thereof Download PDFInfo
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- CN102674822B CN102674822B CN 201210118871 CN201210118871A CN102674822B CN 102674822 B CN102674822 B CN 102674822B CN 201210118871 CN201210118871 CN 201210118871 CN 201210118871 A CN201210118871 A CN 201210118871A CN 102674822 B CN102674822 B CN 102674822B
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Abstract
The invention relates to injection molding granules for ferrite cores and a production method thereof. The injection molding granules for the ferrite cores comprise, by weight percent, 70%-95% of powder, and 5%-30% of binder. The powder comprises, by weight percent, 60%-70% of ferric oxide, 10%-20% of nickel oxide, 2%-10% of copper oxide, and 15%-25% of zinc oxide. The binder comprises, by weight percent, 40%-80% of paraffin, 5%-25% of polyethylene, 5%-25% of polypropylene, 1%-3% of dioctyl phthalate, 1%-3% of dibutyl phthalate, and 2%-8% of oleic acid. By the aid of the injection molding granules for the ferrite cores, the problem of cylindrical shaping of magnet cores is well solved, and uniformity of the injection molding granules for ferrite cores is guaranteed. The magnet cores made of the injection molding granules are high and uniform in density, high in mechanical strength and high in thermal shock performance.
Description
Technical field
The present invention relates to powder injection molding field, particularly pellet of using of a kind of FERRITE CORE injection molding and preparation method thereof.
Background technology
The production technology of conventional cores mainly is dry pressing.Have many good qualities: as the production efficiency height, manually less, scrap rate is low, and is with short production cycle, the extrudate density of production is big, intensity is high, is fit to mass industrialized production.Shortcoming is that the shape of moulding product has bigger restriction, and the mould cost is higher, and blank strength is low, and the base substrate interior solid is inconsistent, and the homogeneity of weave construction is relatively poor relatively etc.Because the stem stem of magnetic core is generally cylindrically, dry-pressing generally can not disposablely be finished, and need be pressed into square column type earlier, becomes cylindrical with machined into again, so not only increases operation, and has increased production cost and time, and consistency of product is not guaranteed yet again.
Summary of the invention
Technical problem to be solved by this invention provides the pellet that a kind of FERRITE CORE injection molding is used, the present invention also provides the preparation method of the pellet that described FERRITE CORE injection molding uses, described method can be produced satisfactory pellet, the all even consistence that keep feeding are for the injection molding magnetic core is prepared.
The invention provides the pellet that a kind of FERRITE CORE injection molding is used, formed by following components in weight percentage:
Powder 70%-95%
Binding agent 5%-30%;
Described powder is made up of following components in weight percentage:
Described binding agent is made up of following components in weight percentage:
The pellet that FERRITE CORE injection molding of the present invention is used preferably is made up of following components in weight percentage:
Powder 80%
Binding agent 20%.
Described powder preferably is made up of following components in weight percentage:
Described binding agent preferably is made up of following components in weight percentage:
The present invention also provides the preparation method of the pellet that described FERRITE CORE injection molding uses, and comprises the steps:
1) preparation binding agent
With heating paraffin to 120 ℃-200 ℃, after treating that paraffin all fuses, add polyethylene, polypropylene, and constantly stir with stirring rod, all after the dissolving, add dioctyl phthalate (DOP), dibutyl phthalate, oleic acid again, obtain binding agent, each material add-on is according to the described weight percent meter of claim 1;
2) preparation powder
To make its even mixing by agitating ball mill according to ferric oxide, nickel oxide, cupric oxide and the zinc oxide of the described weight percent of claim 1, the rotating speed of described agitating ball mill is 30-60r/mi n, the ball milling time is 30-50h, under 800 ℃ of-1000 ℃ of temperature, calcine then, calcination time is 1-3h, and waiting to have calcined the back is the powder of 0.5-2.0 μ m with ball mill to granularity with its ball milling;
3) banburying of powder and binding agent
Earlier powder is dried with baking oven, bake out temperature is 80 ℃-150 ℃, drying time is 1h-2h, takes out to be cooled to room temperature, and the binding agent that itself and step 1) are obtained is according to the banburying in Banbury mixer of the described weight percent of claim 1 again, design temperature is 120 ℃-200 ℃, the frequency that agitator is set is 25-65Hz, after every banburying 30-60 minute, and stirring 1 time, stirring is 3-4 time altogether, obtains cake mass;
4) pulverizing of cake mass
With pulverizer cake mass is crushed to the pellet that median size is 8mm.
Described paraffin is paraffin wax fully refined preferably.
Compare the cylindrical stem stem that dry pressuring forming process can not once solve magnetic core, the pellet injection moulding of using FERRITE CORE injection molding of the present invention to use has solved the problem of the cylindrical moulding of magnetic core well, and is also guaranteed to consistency of product; And, density homogeneous big with the magnetic core density of its production, mechanical strength height and thermal shock performance are good.
Embodiment
The invention provides the pellet that a kind of FERRITE CORE injection molding is used, be made up of binding agent and powder, wherein binding agent is made up of paraffin, polyethylene, polypropylene, oleic acid, dioctyl phthalate (DOP) and dibutyl phthalate.
Binding agent is a kind of carrier that exists in short-term, and it makes powder evenly load into desired shape, and makes this shape remain to sintering to begin always.Thereby although binding agent does not determine final chemical ingredients, can it can directly influence technology successful.Binding agent must become the even feeding for use in injection molding with powder mixes.Binding agent can have influence on all respects of powder injection molding moulding, and wherein some aspect is conflicting, so binding agent becomes the conditioning agent of each side factor.
Binding agent also requires binding agent can prevent powder agglomeration and segregation except requiring viscosity will be hanged down when content of powder is high.Usually, paraffin can't satisfy this requirement, needs to add polymkeric substance and is improved, so most of binder systems are made up of two kinds of different components of chemical structure at least, this binder system is made up of polyethylene and polypropylene.Because aspect flow characteristics, in order to keep the base substrate shape in process of cooling, it is essential increasing viscosity, but under mold temperature, the noticeable change of viscosity with temperature will be unfavorable for process control and may become the defective source.If viscosity is too low, binding agent will separate with powder in the moulding process, will cause having graded in the base substrate, and high viscosity can hinder mixing and moulding.The short thermoplastic polymer of molecular chain length can satisfy good moulding requirement, and these also are down to the chain direction in the moulding component minimum than short molecular chain, and this is very important to the performance that obtains isotropic.Also having an important characteristic is that this binder system is easy to decompose when degreasing, and does not corrode sintering oven.
Want earlier temperature to be set in certain scope in binder making, temperature can not be too high, because will prevent polyethylene, polypropylene depolymerization and oleic acid, dioctyl phthalate (DOP), dibutyl phthalate volatilization; After treating that paraffin all fuses, add polyethylene, polypropylene, and constantly stir with stirring rod, all after the dissolving, add dioctyl phthalate (DOP), dibutyl phthalate, oleic acid again.Wherein dioctyl phthalate (DOP) and dibutyl phthalate play toughness reinforcing effect here as softening agent; Oleic acid is as tensio-active agent, because powder is polarity, fluidizer is nonpolar, and the two is difficult for absorption, produces precipitation when heating for a long time, so usually add the media that contacts that tensio-active agent is used as powder and fluidizer in producing; Tensio-active agent is made up of the non-polar group of hydrophilic polar group and oleophylic, the carboxyl of promoting agent is polarity, can be combined with powder, alkyl is nonpolar, can mix with fluidizer, surfactant can be attached together powder and fluidizer indirectly like this, guarantees the even of batch mixing, and can be between the powder particle, play lubricated effect between powder particle and the die wall, thereby reach the effect of banburying and injection.
Described powder is made up of ferric oxide, nickel oxide, cupric oxide and zinc oxide,, under 800 ℃ of-1000 ℃ of temperature, calcine then, after waiting to have calcined its even mixing by agitating ball mill, carry out ball milling to the granularity 0.5-2.0 μ m of powder with ball mill, oven dry can be used.Because under this granularity, powder active is good, can carry out effective sintering, crystalline structure densification, the tiny homogeneous of crystal grain.
The banburying of powder and binding agent is a very crucial step.In this case, the allocation optimum of powder and binding agent is exactly crucial.The weight percent of binding agent is 5-30% among the present invention, and the weight percent of powder is 70-95%.Binding agent very little can cause too high viscosity and the generation in space, thereby makes moulding very difficult.Too much binding agent also is worthless, because when moulding, and too much binding agent meeting and powder separation, thus overlap appears, perhaps base substrate uneven components.The more important thing is, a large amount of losses of composition when excessive binding agent can cause degreasing, after binding agent was removed, particle can not remain on original position, and bad phenomenon such as distortion, cracking appear in product behind the sintering.
For thermoplastic adhesive, banburying is carried out under moderate temperature, and shear and play a leading role this moment, and heating is necessary for the viscosity and the yield-point that reduce mixture.But banburying under higher temperature can reduce the viscosity of binding agent, thereby makes powder separation.
Banburying is earlier powder to be dried with baking oven, take out cooling, again it and binding agent are joined banburying in the Banbury mixer according to proportioning, design temperature is 120 ℃-200 ℃, the frequency that agitator is set is 25-65Hz, and after every mixing 30-60 minute, stirring once, stirring is 3-4 time altogether, i.e. banburying goes out the bright and clean cake mass of color and luster.
The pulverizing of pug is crushed to the pellet that median size is 8mm with pulverizer after referring to the pug cooling, and pellet enters injecting machine material tube injection molding easily.
Further specify below in conjunction with the present invention of embodiment:
Embodiment 1
The pellet that present embodiment provides a kind of FERRITE CORE injection molding to use, formed by following components in weight percentage:
Powder 70%
Binding agent 30%
Described powder is made up of following components in weight percentage:
Described binding agent is made up of following components in weight percentage:
Present embodiment also provides the preparation method of the pellet that described FERRITE CORE injection molding uses, and its step comprises:
1) preparation binding agent
Earlier with heating paraffin to 180 ℃, treat that paraffin all after the fusion, adds polyethylene, polypropylene, and constantly stirs with stirring rod, all after the dissolving, add dioctyl phthalate (DOP), dibutyl phthalate and oleic acid again, obtain binding agent.Wherein add each amount of substance all according to above weight percent meter.
2) preparation powder
To make its even mixing by agitating ball mill according to ferric oxide, nickel oxide, cupric oxide and the zinc oxide of above weight percent, the rotating speed of described agitating ball mill is 40r/min, the ball milling time is 40h, calcining 2h then under 800 ℃ of temperature, is the powder of 1.0 μ m with ball mill to granularity with its ball milling then.
3) banburying of powder and binding agent
Earlier powder is dried with baking oven, 120 ℃ of bake out temperatures, drying time is 2h, oven dry back is taken out and is cooled to room temperature, and the binding agent that itself and step 1) are obtained mixes according to above weight percent and puts into the Banbury mixer banburying, 180 ℃ of design temperatures again, the frequency that agitator is set is 25Hz, every banburying is after 40 minutes, and stirring 1 time is total to stirring and obtains cake mass 4 times.
4) fragmentation of cake mass
The cake mass that step 3) is obtained is crushed to the pellet that median size is 8mm with pulverizer, namely obtains the pellet that the injection molding of present embodiment FERRITE CORE is used.
Detect:
The pellet that the FERRITE CORE injection molding of use present embodiment production is used is put into injecting machine material tube injection molding, injection pressure 12.5MPa wherein, injecting rate 45g/s, make FERRITE CORE, with pull and push dynamometer the product of producing is carried out Mechanics Performance Testing, with the wicking stove product of producing is carried out the thermal shock performance test, simultaneously magnetic core is carried out density measurement, the product of producing with traditional dry-pressing production method compares, and detected result sees Table 1.
Embodiment 2
The pellet that present embodiment provides a kind of FERRITE CORE injection molding to use, formed by following components in weight percentage:
Powder 75%
Binding agent 25%
Described powder is made up of following components in weight percentage:
Described binding agent is made up of following components in weight percentage:
Present embodiment also provides the preparation method of the pellet that described FERRITE CORE injection molding uses, and its step comprises:
1) preparation binding agent
Earlier with heating paraffin to 160 ℃, treat that paraffin all after the fusion, adds polyethylene, polypropylene, and constantly stir with stirring rod, all after the dissolving, add dioctyl phthalate (DOP), dibutyl phthalate and oleic acid again, wherein add each amount of substance all according to above weight percent meter.
2) preparation powder
Ferric oxide, nickel oxide, cupric oxide and the zinc oxide of above weight percent are made its even mixing by agitating ball mill, the rotating speed of described agitating ball mill is 50r/min, the ball milling time is 30h, then at 800 ℃ of temperature lower calcination 2h, after waiting to have calcined, be the powder of 1.8 μ m with ball mill to granularity with its ball milling.
3) banburying of powder and binding agent
Banburying is earlier powder to be dried with baking oven, 110 ℃ of bake out temperatures, drying time is 1.5h, taking-up is cooled to room temperature, and the binding agent that itself and step 1) are obtained is put into the Banbury mixer banburying according to above percentage mix, 150 ℃ of design temperatures again, the frequency that agitator is set is 45Hz, every banburying is after 50 minutes, and stirring 1 time is total to stirring and obtains cake mass 3 times.
4) fragmentation of cake mass
The cake mass that step 3) is obtained is crushed to the pellet that median size is 8mm with pulverizer, namely obtains the pellet that the injection molding of present embodiment FERRITE CORE is used.
Detect:
Detection method is identical with embodiment 1, and detected result sees Table 1.
Embodiment 3
The pellet that present embodiment provides a kind of FERRITE CORE injection molding to use, formed by following components in weight percentage:
Powder 80%
Binding agent 20%
Described powder is made up of following components in weight percentage:
Described binding agent is made up of following components in weight percentage:
Present embodiment also provides the preparation method of the pellet that described FERRITE CORE injection molding uses, and its step comprises:
1) preparation binding agent
Earlier with heating paraffin to 120 ℃, treat that paraffin all after the fusion, adds polyethylene, polypropylene, and constantly stir with stirring rod, all after the dissolving, add dioctyl phthalate (DOP), dibutyl phthalate and oleic acid again, wherein add each amount of substance all according to above weight percent meter.
2) preparation powder
To make its even mixing by agitating ball mill according to ferric oxide, nickel oxide, cupric oxide and the zinc oxide of above-mentioned weight percent, the rotating speed of described agitating ball mill is 30r/min, the ball milling time is 50h, at 800 ℃ of temperature lower calcination 2h, waiting to have calcined the back is the powder of 1.8 μ m with ball mill to granularity with its ball milling then.
3) banburying of powder and binding agent
Banburying is earlier powder to be dried with baking oven, 150 ℃ of bake out temperatures, drying time is 1h, taking-up is cooled to room temperature, and the binding agent that itself and step 1) are obtained mixes according to above weight percent and puts into the Banbury mixer banburying, 190 ℃ of design temperatures again, the frequency that agitator is set is 55Hz, every banburying is after 30 minutes, and stirring 1 time is total to stirring and obtains cake mass 4 times.
4) fragmentation of cake mass
The cake mass that step 3) is obtained is crushed to the pellet that median size is 8mm with pulverizer, namely obtains the pellet that the injection molding of present embodiment FERRITE CORE is used.
Detect:
Detection method is identical with embodiment 1, and detected result sees Table 1.
Embodiment 4
The pellet that present embodiment provides a kind of FERRITE CORE injection molding to use, formed by following components in weight percentage:
Powder 85%
Binding agent 15%
Described powder is made up of following components in weight percentage:
Described binding agent is made up of following components in weight percentage:
Present embodiment also provides the preparation method of the pellet that described FERRITE CORE injection molding uses, and its step comprises:
1) preparation binding agent
Earlier with heating paraffin to 200 ℃, treat that paraffin all after the fusion, adds polyethylene, polypropylene, and constantly stir with stirring rod, all after the dissolving, add dioctyl phthalate (DOP), dibutyl phthalate and oleic acid again, wherein add each amount of substance all according to above weight percent meter.
2) preparation powder
To make its even mixing by agitating ball mill according to ferric oxide, nickel oxide, cupric oxide and the zinc oxide of above-mentioned weight percent, the rotating speed of described agitating ball mill is 45r/min, the ball milling time is 45h, at 800 ℃ of temperature lower calcination 2h, waiting to have calcined the back is the powder of 1.8 μ m with ball mill to granularity with its ball milling then.
3) banburying of powder and binding agent
Banburying is earlier powder to be dried with baking oven, 130 ℃ of bake out temperatures, drying time is 1h, taking-up is cooled to room temperature, and the binding agent that itself and step 1) are obtained mixes according to above weight percent and puts into the Banbury mixer banburying, 190 ℃ of design temperatures again, the frequency that agitator is set is 55Hz, every banburying is after 30 minutes, and stirring 1 time is total to stirring and obtains cake mass 4 times.
4) fragmentation of cake mass
The cake mass that step 3) is obtained is crushed to the pellet that median size is 8mm with pulverizer, namely obtains the pellet that the injection molding of present embodiment FERRITE CORE is used.
Detect:
Detection method is identical with embodiment 1, and detected result sees Table 1.
Embodiment 5
The pellet that present embodiment provides a kind of FERRITE CORE injection molding to use, formed by following components in weight percentage:
Powder 90%
Binding agent 10%
Described powder is made up of following components in weight percentage:
Described binding agent is made up of following components in weight percentage:
Present embodiment also provides the preparation method of the pellet that described FERRITE CORE injection molding uses, and its step comprises:
1) preparation binding agent
Earlier with heating paraffin to 170 ℃, treat that paraffin all after the fusion, adds polyethylene, polypropylene, and constantly stir with stirring rod, all after the dissolving, add dioctyl phthalate (DOP), dibutyl phthalate and oleic acid again, wherein add each amount of substance all according to above weight percent meter.
2) preparation powder
To make its even mixing by agitating ball mill according to ferric oxide, nickel oxide, cupric oxide and the zinc oxide of above-mentioned weight percent, the rotating speed of described agitating ball mill is 55r/min, the ball milling time is 35h, at 800 ℃ of temperature lower calcination 2h, waiting to have calcined the back is the powder of 1.8 μ m with ball mill to granularity with its ball milling then.
3) banburying of powder and binding agent
Banburying is earlier powder to be dried with baking oven, 100 ℃ of bake out temperatures, drying time is 2h, taking-up is cooled to room temperature, and the binding agent that itself and step 1) are obtained is put into the Banbury mixer banburying according to above percentage mix, 180 ℃ of design temperatures again, the frequency that agitator is set is 65Hz, every banburying is after 40 minutes, and stirring 1 time is total to stirring and obtains cake mass 4 times.
4) fragmentation of cake mass
The cake mass that step 3) is obtained is crushed to the pellet that median size is 8mm with pulverizer, namely obtains the pellet that the injection molding of present embodiment FERRITE CORE is used.
Detect:
Detection method is identical with embodiment 1, and detected result sees Table 1.
Table 1
By embodiment 1-5 detected result as can be known, magnetic core mechanical property and thermal shock performance that the pellet of using with FERRITE CORE injection molding of the present invention is produced are all good than the magnetic core that traditional dry-pressing method is produced, and its magnetic core density also is greater than the magnetic core density that traditional dry-pressing method is produced.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention does, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, conceive under the prerequisite not breaking away from the present invention, can also make some simple deduction or replace, all should be considered as protection domain of the present invention.
Claims (5)
1. pellet that FERRITE CORE injection molding is used, formed by following components in weight percentage:
Powder 70%-95%
Binding agent 5%-30%;
Described powder is made up of following components in weight percentage:
Described binding agent is made up of following components in weight percentage:
The preparation method of the pellet that above-mentioned FERRITE CORE injection molding is used comprises the steps:
1) preparation binding agent
With heating paraffin to 120 ℃-200 ℃, after treating that paraffin all fuses, add polyethylene, polypropylene, and constantly stir with stirring rod, all after the dissolving, add dioctyl phthalate (DOP), dibutyl phthalate, oleic acid again, obtain binding agent, each material add-on is according to above-mentioned weight percent meter;
2) preparation powder
Ferric oxide, nickel oxide, cupric oxide and the zinc oxide of above-mentioned weight percent are made its even mixing by agitating ball mill, the rotating speed of described agitating ball mill is 30-60r/min, the ball milling time is 30-50h, under 800 ℃ of-1000 ℃ of temperature, calcine then, calcination time is 1-3h, and waiting to have calcined the back is the powder of 0.5-2.0 μ m with ball mill to granularity with its ball milling;
3) banburying of powder and binding agent
Earlier powder is dried with baking oven, bake out temperature is 80 ℃-150 ℃, drying time is 1h-2h, takes out to be cooled to room temperature, and the binding agent that itself and step 1) are obtained is according to the banburying in Banbury mixer of above-mentioned weight percent again, design temperature is 120 ℃-200 ℃, the frequency that agitator is set is 25-65Hz, after every banburying 30-60 minute, and stirring 1 time, stirring is 3-4 time altogether, obtains cake mass;
4) pulverizing of cake mass
With pulverizer cake mass is crushed to the pellet that median size is 8mm.
2. the pellet used of FERRITE CORE injection molding as claimed in claim 1 is characterized in that it is made up of following components in weight percentage:
Powder 80%
Binding agent 20%.
3. the pellet used of FERRITE CORE injection molding as claimed in claim 2 is characterized in that described powder is made up of following components in weight percentage:
4. the pellet used of FERRITE CORE injection molding as claimed in claim 3 is characterized in that described binding agent is made up of following components in weight percentage:
5. the pellet used of FERRITE CORE injection molding as claimed in claim 4 is characterized in that described paraffin is paraffin wax fully refined.
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| CN 201210118871 CN102674822B (en) | 2012-04-20 | 2012-04-20 | Injection molding granules for ferrite cores and production method thereof |
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| CN 201210118871 CN102674822B (en) | 2012-04-20 | 2012-04-20 | Injection molding granules for ferrite cores and production method thereof |
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| CN104725034A (en) * | 2015-03-17 | 2015-06-24 | 深圳顺络电子股份有限公司 | Feed material for injection-molding ferrite core formation and preparation method thereof |
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| CN105084886B (en) * | 2015-08-21 | 2017-08-25 | 深圳顺络电子股份有限公司 | Piezo-resistance base substrate and preparation method thereof, piezo-resistance and preparation method thereof |
| CN105130417B (en) * | 2015-08-21 | 2017-03-29 | 深圳顺络电子股份有限公司 | A kind of pellet of injection moulding varistor and preparation method thereof |
| CN109986075A (en) * | 2019-04-02 | 2019-07-09 | 合肥核舟电子科技有限公司 | A kind of metal powder injection molding magnetism feeding and preparation method thereof |
| CN111362681B (en) * | 2019-12-11 | 2021-09-17 | 横店集团东磁股份有限公司 | High-performance permanent magnetic ferrite magnet sintered after injection molding and preparation method thereof |
| CN112094113A (en) * | 2020-09-22 | 2020-12-18 | 泗洪钰磁电子科技有限公司 | Powdery mixture for preparing magnetic core and preparation method thereof |
| CN115772031B (en) * | 2022-09-23 | 2024-01-16 | 深圳艾利门特科技有限公司 | Preparation method of manganese zinc ferrite magnetic spacer |
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