CN115650717A - Nickel-zinc ferrite for high-current chip inductor and preparation method thereof - Google Patents

Abstract

The invention discloses a nickel-zinc ferrite for a large-current chip inductor, which is prepared from nickel-zinc ferrite powder, small materials, soft resin, hard resin, a dispersing agent, a plasticizer, n-propyl acetate and isobutanol.

Description

Nickel-zinc ferrite for high-current chip inductor and preparation method thereof

Technical Field

The invention particularly relates to a nickel-zinc ferrite for a large-current chip inductor and a preparation method thereof.

Background

The nickel-zinc ferrite is an important electronic functional material, has the characteristics of high frequency, wide frequency, high impedance and low loss, is a soft magnetic ferrite material which is most widely applied in a high frequency range (1-100 MHz), and is widely applied to the fields of computers, communication, consumer electronics and the like.

The usage amount of the nickel-zinc ferrite one-step formed ultrathin product in electronic products is continuously increased, and the nickel-zinc ferrite one-step formed ultrathin product has very stable size and electrical characteristics. However, since the nickel-zinc ferrite adopts water as the solvent in the preparation and forming process, the volatilization speed of the solvent cannot be controlled in the drying step in the preparation process, the solid content of the slurry is also reduced in a phase-change manner by increasing the addition amount of the solvent, and the problem of uneven density of the blank formed by subsequent processing is easily caused, so that the blank is deformed after sintering, and the problems of low boss density, easy abrasion, low magnetic core strength and poor electric conductivity of the final product are easily caused.

Disclosure of Invention

In view of the above, the present invention aims to provide a nickel-zinc ferrite for a large-current chip inductor with high magnet compactness and good electrical properties, and also provides a corresponding preparation method.

In order to solve the technical problem, the technical scheme of the invention is as follows:

a nickel-zinc ferrite for a high-current chip inductor comprises the following components in optimal weight: 25000g of nickel-zinc ferrite powder, 125g of small materials, 4800g of soft resin, 350g of hard resin, 175g of dispersing agent, 575g of plasticizer, 19000g of n-propyl acetate and 2717g of isobutanol.

Furthermore, the nickel-zinc ferrite powder adopts analytically pure NiO, znO, fe2O3 and TiO2 as raw materials, and is weighed according to the component of Ni0.4Zn0.6Fe2-xTixO4, wherein x is 0, 0.025, 0.05, 0.075 or 0.1.

Further, the small materials are a mixture of copper oxide, manganese oxide and calcium carbonate.

Further, the dispersant is ammonium polyacrylate.

Further, the plasticizer is one of dibutyl phthalate, epoxidized soybean oil and polyethylene glycol.

A preparation method of nickel-zinc ferrite for a high-current chip inductor comprises the following steps:

s1, placing the weighed nickel-zinc ferrite powder in a mortar to fully grind for 2 hours to prepare powder with the powder granularity of 0.8-2.0 mu m for later use;

s2, filling the powder obtained by the treatment in the step 1 into an alumina crucible, presintering for 3 hours at 900 ℃, taking out, and performing vibration grinding for later use;

s3, adding the mixed n-propyl acetate of the soft resin and the hard resin into a ball mill tank, and grinding for 7-13h by using steel balls or zirconium balls, so that the soft resin and the hard resin are dissolved in the n-propyl acetate and are quickly dissolved in the grinding process, adding the nickel-zinc ferrite powder prepared in the step 2 after the soft resin and the hard resin are completely dissolved in the n-propyl acetate, sequentially adding the weighed small materials, isobutanol, a plasticizer and a dispersing agent, grinding for 37-43h, and preparing slurry with high fluidity and 32-34S viscosity for later use;

and S4, sequentially carrying out processes of forming, cutting, binder removal and sintering on the slurry prepared in the step 3 to prepare a membrane, and reprocessing to produce a formed product after passing an electrical property experiment test.

The technical effects of the invention are mainly embodied in the following aspects: the invention is prepared from nickel-zinc ferrite powder, small materials, soft resin, hard resin, a dispersing agent, a plasticizer, n-propyl acetate and isobutanol by selecting an optimal weight ratio, in the preparation process of the slurry, the n-propyl acetate and the isobutanol are used as solvents, the volatilization speed of an organic solvent can be controlled, the viscosity of the slurry is reduced by the dispersing agent to reduce the addition of the solvent in the slurry, so that the solid content of the slurry is improved, the toughness of the membrane quality is improved by the plasticizer, the growth of sintering crystals of the slurry in the later process is improved by the small materials, and the compactness of the magnet is improved.

Detailed Description

The following detailed description of specific embodiments of the present invention is provided to facilitate understanding and appreciation of the inventive concepts.

Examples

A nickel-zinc ferrite for a high-current chip inductor comprises the following components in optimal weight: 25000g of nickel-zinc ferrite powder, 125g of small materials, 4800g of soft resin, 350g of hard resin, 175g of dispersing agent, 575g of plasticizer, 19000g of n-propyl acetate and 2717g of isobutanol.

In this example, the nickel-zinc ferrite powder was prepared from analytically pure N iO, znO, fe2O3 and TiO2 by weighing and blending ni0.4zn0.6fe2-xTixO4 components, where x is 0, 0.025, 0.05, 0.075 or 0.1.

A preparation method of nickel-zinc ferrite for a high-current chip inductor comprises the following steps:

s1, placing the weighed nickel-zinc ferrite powder in a mortar to fully grind for 2 hours to prepare powder with the powder granularity of 0.8-2.0 mu m for later use;

s2, putting the powder obtained by the treatment in the step 1 into an alumina crucible, pre-burning for 3 hours at 900 ℃, taking out, and performing vibration grinding for later use;

s3, adding the mixed n-propyl acetate of the soft resin and the hard resin into a ball mill tank, and grinding for 7-13h by using steel balls or zirconium balls, so that the soft resin and the hard resin are dissolved in the n-propyl acetate and are quickly dissolved in the grinding process, adding the nickel-zinc ferrite powder prepared in the step 2 after the soft resin and the hard resin are completely dissolved in the n-propyl acetate, sequentially adding the weighed small materials, isobutanol, a plasticizer and a dispersing agent, grinding for 37-43h, and preparing slurry with high fluidity and 32-34S viscosity for later use;

and S4, sequentially carrying out processes of forming, cutting, binder removal and sintering on the slurry prepared in the step 3 to prepare a membrane, and processing the membrane to produce a formed product after the membrane is qualified through an electrical property experiment.

In this example, the small material is a mixture of copper oxide, manganese oxide and calcium carbonate.

In this embodiment, the dispersant is ammonium polyacrylate, and mainly functions to reduce the viscosity of the slurry, so as to reduce the amount of solvent added to the slurry, and also to increase the solid content of the slurry, in the forming and drying process, the arrangement between particles becomes tight due to solvent volatilization in the longitudinal direction, but the distance between particles is still larger due to the fact that the blank does not shrink in the transverse direction, and is approximately equal to the distance between particles in the slurry, so that increasing the solid content of the slurry is beneficial to increasing the bulk density of the blank, and thus a compact magnet can be obtained after sintering.

In this embodiment, the plasticizer is one of dibutyl phthalate, epoxidized soybean oil and polyethylene glycol, and is used for improving the toughness of the film quality.

Examples of the experiments

Detection data of the product, national standard and comparison data of the same type of product in the existing market.

The peer directory standard pair is shown in table 1 below:

TABLE 1

From the comparison of the parameters of the peer directory in table 1, the directories of watsfoot gaku, village and TDK have no standards of 6.8 μ H and 10 μ H, and the results of the comparison of the peer directories are as follows:

1) 4.7 μ H Current contrast precedence order is as follows: village > nation > Shuluo > Fenghuagaoke > TDK;

2) The 6.8 muH current contrast precedence order is as follows: collateral dredging is greater than Bunge;

3) The 10 muH current contrast precedence order is as follows: the collateral is greater than the family of nation.

The measured data of the products of the same group are shown in the following tables 2-6:

TABLE 2

TABLE 3

TABLE 4

TABLE 5 TABLE 6

1. With reference to tables 2-6, the actual electrical properties of the products of department of our nation and the products of watsfoot high school, down-ward, village and TDK are measured, the Ls electrical properties of the products of department of our nation are most concentrated, the direct current resistance is inversely proportional to the rated current, the smaller the direct current resistance, the larger the rated current borne by the products is, and the actual electrical properties can be obtained from actual measurement data and a chart:

1) The 4.7 muH DC resistance contrast precedence order is as follows: nation > village > collateral smoothing > Fenghua Gaokouke > TDK;

2) The 6.8 muH DC resistance comparison priority is as follows: nation > shun luo;

3) The 10 muH DC resistance contrast precedence order is as follows: bangke > shun Luo.

2. Under the same condition, the surface temperature of a product is in direct inverse proportion to the rated current in the 0.5A current test, the higher the surface temperature of the product is, the smaller the rated current borne by the product is, the lower the surface temperature of the product is, the larger the rated current borne by the product is, and the test priority ordering result is as follows:

1) 4.7 μ H product surface temperature contrast precedence order is as follows: nation > village > collateral smoothing, fenghua Gaokouke > TDK;

2) The 6.8 muH product surface temperature contrast priorities are as follows: nation family > shun luo;

3) The 10 muH product surface temperature contrast precedence order is as follows: bangke > shun Luo.

To summarize: from each performance index, the current performance index parameters of the product prepared by the materials and the process in Myospironaceae are more advantageous.

The technical effects of the invention are mainly reflected in the following aspects: the invention is prepared from nickel-zinc ferrite powder, small materials, soft resin, hard resin, a dispersing agent, a plasticizer, n-propyl acetate and isobutanol by selecting an optimal weight ratio, in the preparation process of the slurry, the n-propyl acetate and the isobutanol are used as solvents, the volatilization speed of an organic solvent can be controlled, the viscosity of the slurry is reduced by the dispersing agent to reduce the addition of the solvent in the slurry, so that the solid content of the slurry is improved, the toughness of the membrane quality is improved by the plasticizer, the growth of sintering crystals of the slurry in the later process is improved by the small materials, and the compactness of the magnet is improved.

The above are only typical examples of the present invention, and besides, the present invention may have other embodiments, and all the technical solutions formed by equivalent substitutions or equivalent changes are within the scope of the present invention as claimed.

Claims (6)

1. The nickel-zinc ferrite for the high-current chip inductor is characterized by comprising the following components in optimal weight: 25000g of nickel-zinc ferrite powder, 125g of small materials, 4800g of soft resin, 350g of hard resin, 175g of dispersing agent, 575g of plasticizer, 19000g of n-propyl acetate and 2717g of isobutanol.

2. The nickel-zinc ferrite for the high-current chip inductor according to claim 1, wherein: the nickel-zinc ferrite powder adopts analytically pure NiO, znO, fe2O3 and TiO2 as raw materials, and is weighed according to the Ni0.4Zn0.6Fe2-xTixO4 component, wherein x is 0, 0.025, 0.05, 0.075 or 0.1.

3. The nickel-zinc ferrite for the high-current chip inductor according to claim 1, wherein: the small material is a mixture of copper oxide, manganese oxide and calcium carbonate.

4. The nickel-zinc ferrite for the high-current chip inductor according to claim 1, wherein: the dispersant is ammonium polyacrylate.

5. The nickel-zinc ferrite for the high-current chip inductor according to claim 1, wherein: the plasticizer is one of dibutyl phthalate, epoxidized soybean oil and polyethylene glycol.

6. A method for preparing a nickel-zinc ferrite for a high-current chip inductor according to any one of claims 1 to 5, comprising the following steps:

s1, placing the weighed nickel-zinc ferrite powder in a mortar for fully grinding for 2 hours to prepare powder with the powder granularity of 0.8-2.0 mu m for later use;

s2, putting the powder obtained by the treatment in the step 1 into an alumina crucible, pre-burning for 3 hours at 900 ℃, taking out, and performing vibration grinding for later use;

s3, adding mixed n-propyl acetate of soft resin and hard resin into a ball milling tank, and grinding for 7-13h by using steel balls or zirconium balls to dissolve the soft resin and the hard resin in the n-propyl acetate, quickly dissolving in the grinding process, adding the nickel-zinc ferrite powder prepared in the step 2 after the soft resin and the hard resin are completely dissolved in the n-propyl acetate, sequentially adding weighed small materials, isobutanol, a plasticizer and a dispersing agent, grinding for 37-43h, and preparing slurry with high fluidity and 32-34S viscosity for later use;

and S4, sequentially carrying out processes of forming, cutting, binder removal and sintering on the slurry prepared in the step 3 to prepare a membrane, and processing the membrane to produce a formed product after the membrane is qualified through an electrical property experiment.