CN103382105B - Nickel-zinc soft magnetic ferrite material and preparation method thereof - Google Patents

Abstract

The invention provides a nickel-zinc soft magnetic ferrite material and a preparation method thereof. The invention is characterized in that main components of the nickel-zinc soft magnetic ferrite material comprise, by mol, 11.5 to 12 mol of NiO, 32 to 32.5 mol of Fe3O4, 12 to 12.5 mol of ZnO, 5.2 to 5.5 mol of V2O5 and 0.2 to 0.3 mol of WO3, and modification impurities added in the main components comprise, in terms of the weight of the nickel-zinc soft magnetic ferrite material, 460 to 480 ppm of HfO2, 310 to 330 ppm of chromium boride, 250 to 280 ppm of molybdenum disulfide, 80 to 120 ppm of Ti2O and 480 to 520 ppm of PtO2. The nickel-zinc soft magnetic ferrite material provided by the invention has the characteristics of high frequency, high magnetic permeability, high Bs and high TC.

Description

A kind of Ni-Zn soft magnetic ferrite material and preparation method thereof

Technical field

The present invention relates to technical field of magnetic materials, particularly, the present invention relates to a kind of Ni-Zn soft magnetic ferrite material and preparation method thereof.

Background technology

The high ferromagnetic oxide powder of magnetic flux density, magnetic core are to realize in the electronic equipments such as program control communication, digital technology, network communication colour TV, being used as the products such as inductor, filter, pulse transformer and making its miniaturization, the requisite electronic material of lightweight, improve constantly the magnetic flux density in magnetic material, it is the pursuit of being engaged in these professional engineers and technicians and production firm always, and the performance index of material are as all unsatisfactory in loss, frequency characteristic, Curie temperature etc.

Summary of the invention

The object of this invention is to provide a kind of Ni-Zn soft magnetic ferrite material and preparation method thereof.

The technical solution adopted in the present invention is:

A kind of Ni-Zn soft magnetic ferrite material, is characterized in that, principal component counts by molar and comprises: 11.5-12molNiO, 32-32.5mol Fe ₃o ₄, 12-12.5molZnO, 5.2-5.5mol V ₂o ₅, 0.2-0.3mol WO ₃, the modification impurity adding in principal component comprises according to the weighing scale that accounts for described Ni-Zn soft magnetic ferrite material: 460-480ppm HfO ₂, 310-330ppm chromium boride, 250-280ppm molybdenum bisuphide, 80-120ppmTi ₂o3,480-520ppm PtO ₂;

The preparation method of described Ni-Zn soft magnetic ferrite material, is characterized in that comprising the following steps:

(1) batching: principal component is prepared burden, and add modification impurity;

(2) once sintered: batching is blended in pre-burning 1-2 hour under the condition of 540 DEG C-580 DEG C, then be warming up to pre-burning 2-3 hour under the condition of 860 DEG C-920 DEG C, obtain Preburning material;

(3) ball milling, pressed compact: Preburning material is put into sand mill, add the 0.6-1.0wt% polyvinyl alcohol that is equivalent to prepare burden, 1.0-1.2wt% disperse materials, appropriate amount of deionized water to carry out sand milling 90-120 minute simultaneously, obtain slurry, and dry; The powder of oven dry is added to the polyvinyl alcohol of 1.2-1.8wt%, the zinc stearate of 0.2-0.4wt%, and granulation, packs mould into, under 75-85Mpa pressure, is pressed into blank, naturally dries;

(4) double sintering: magnetic core blank is put into nitrogen atmosphere protection pushed bat kiln sintering, first rise to 540-580 DEG C with the heating rate of 130-150 DEG C/h; Sintering 1-2 hour; Adjust again oxygen content 1.0%-1.2% in blanket of nitrogen, by 840-870 DEG C, be incubated 2-3 hour with the heating rate of 100-120 DEG C/h; Adjusting oxygen content in nitrogen atmosphere is 0.3%-0.5% again, rises to 1390-1440 DEG C, heat preservation sintering 4-5 hour with the heating rate of 180-190 DEG C/h; Then cooling, adjusts oxygen content 1.4%-1.6%, is cooled to 680-710 DEG C with the rate of temperature fall of 120-140 DEG C/h, insulation 1-2 hour, then be cooled to room temperature with the rate of temperature fall of 180-220 DEG C/h;

Disperse materials described in step (3) is made by the raw material of following weight portion: polyvinyl alcohol 3-4, zinc stearate 2-3, Bi ₂o ₃0.2-0.3, aminopropyl triethoxysilane 0.5-0.8, aluminium nitride 1-1.3, Nb ₂o ₅0.3-0.5, barium sulfate 1.2-1.4, petroleum sodium sulfonate 0.6-0.9;

Preparation method is: by each mixing of materials, grinding distribution evenly.

The present invention has the characteristic of high frequency, high magnetic permeability, high Bs, high TC.

embodiment

A kind of Ni-Zn soft magnetic ferrite material, principal component counts by molar and comprises: 12molNiO, 32.5mol Fe ₃o ₄, 12.5molZnO, 5.2mol V ₂o ₅, 0.3mol WO ₃, the modification impurity adding in principal component comprises according to the weighing scale that accounts for described Ni-Zn soft magnetic ferrite material: 480ppm HfO ₂, 330ppm chromium boride, 280ppm molybdenum bisuphide, 120ppmTi ₂o3,520ppm PtO ₂;

The preparation method of Ni-Zn soft magnetic ferrite material, comprises the following steps:

(1) batching: principal component is prepared burden, and add modification impurity;

(2) once sintered: batching is blended in pre-burning 1-2 hour under the condition of 540 DEG C-580 DEG C, then be warming up to pre-burning 2-3 hour under the condition of 860 DEG C-920 DEG C, obtain Preburning material;

(3) ball milling, pressed compact: Preburning material is put into sand mill, add the 0.6-1.0wt% polyvinyl alcohol that is equivalent to prepare burden, 1.0-1.2wt% disperse materials, appropriate amount of deionized water to carry out sand milling 90-120 minute simultaneously, obtain slurry, and dry; The powder of oven dry is added to the polyvinyl alcohol of 1.2-1.8wt%, the zinc stearate of 0.2-0.4wt%, and granulation, packs mould into, under 75-85Mpa pressure, is pressed into blank, naturally dries;

(4) double sintering: magnetic core blank is put into nitrogen atmosphere protection pushed bat kiln sintering, first rise to 540-580 DEG C with the heating rate of 130-150 DEG C/h; Sintering 1-2 hour; Adjust again oxygen content 1.0%-1.2% in blanket of nitrogen, by 840-870 DEG C, be incubated 2-3 hour with the heating rate of 100-120 DEG C/h; Adjusting oxygen content in nitrogen atmosphere is 0.3%-0.5% again, rises to 1390-1440 DEG C, heat preservation sintering 4-5 hour with the heating rate of 180-190 DEG C/h; Then cooling, adjusts oxygen content 1.4%-1.6%, is cooled to 680-710 DEG C with the rate of temperature fall of 120-140 DEG C/h, insulation 1-2 hour, then be cooled to room temperature with the rate of temperature fall of 180-220 DEG C/h;

Disperse materials described in step (3) by following weight portion (kilogram) raw material make: polyvinyl alcohol 4, zinc stearate 3, Bi ₂o ₃0.3, aminopropyl triethoxysilane 0.8, aluminium nitride 1, Nb ₂o ₅0.5, barium sulfate 1.4, petroleum sodium sulfonate 0.9;

Preparation method is: by each mixing of materials, grinding distribution evenly.

The performance data of the magnetic ferrite magnetic core making by above-described embodiment:

Sequence number	Technical indicator title	Technical indicator	Remarks
				1	Initial permeability (25 ± 3 DEG C)	7300±25%	?
2	Power loss (100Kc, 200mT) unit: KW/m 3	663(25±2℃), 345(100±2℃)	?
				3	Saturation flux density mT(100 DEG C)	465	?
4	Curie temperature DEG C	>260	?

Claims (1)

1. a Ni-Zn soft magnetic ferrite material, is characterized in that, principal component counts by molar and comprises: 11.5-12molNiO, 32-32.5mol Fe ₃o ₄, 12-12.5molZnO, 5.2-5.5mol V ₂o ₅, 0.2-0.3mol WO ₃, the modification impurity adding in principal component comprises according to the weighing scale that accounts for described Ni-Zn soft magnetic ferrite material: 460-480ppm HfO ₂, 310-330ppm chromium boride, 250-280ppm molybdenum bisuphide, 80-120ppmTi ₂o ₃, 480-520ppm PtO ₂;

The preparation method of described Ni-Zn soft magnetic ferrite material, is characterized in that comprising the following steps:

(1) batching: principal component is prepared burden, and add modification impurity;

(2) once sintered: batching is blended in pre-burning 1-2 hour under the condition of 540 DEG C-580 DEG C, then be warming up to pre-burning 2-3 hour under the condition of 860 DEG C-920 DEG C, obtain Preburning material;

(3) ball milling, pressed compact: Preburning material is put into sand mill, add the 0.6-1.0wt% polyvinyl alcohol that is equivalent to prepare burden, 1.0-1.2wt% disperse materials, appropriate amount of deionized water to carry out sand milling 90-120 minute simultaneously, obtain slurry, and dry; The powder of oven dry is added to the polyvinyl alcohol of 1.2-1.8wt%, the zinc stearate of 0.2-0.4wt%, and granulation, packs mould into, under 75-85MPa pressure, is pressed into blank, naturally dries;

(4) double sintering: magnetic core blank is put into nitrogen atmosphere protection pushed bat kiln sintering, first rise to 540-580 DEG C with the heating rate of 130-150 DEG C/h; Sintering 1-2 hour; Adjust again oxygen content 1.0%-1.2% in blanket of nitrogen, by 840-870 DEG C, be incubated 2-3 hour with the heating rate of 100-120 DEG C/h; Adjusting oxygen content in nitrogen atmosphere is 0.3%-0.5% again, rises to 1390-1440 DEG C, heat preservation sintering 4-5 hour with the heating rate of 180-190 DEG C/h; Then cooling, adjusts oxygen content 1.4%-1.6%, is cooled to 680-710 DEG C with the rate of temperature fall of 120-140 DEG C/h, insulation 1-2 hour, then be cooled to room temperature with the rate of temperature fall of 180-220 DEG C/h;

Disperse materials described in step (3) is made by the raw material of following weight portion: polyvinyl alcohol 3-4, zinc stearate 2-3, Bi ₂o ₃0.2-0.3, aminopropyl triethoxysilane 0.5-0.8, aluminium nitride 1-1.3, Nb ₂o ₅0.3-0.5, barium sulfate 1.2-1.4, petroleum sodium sulfonate 0.6-0.9;

Preparation method is: by each mixing of materials, grinding distribution evenly.