CN102982951A - Nb2O5-containing ferromagnetic core manufacturing method - Google Patents

Abstract

The invention discloses a Nb2O5-containing ferromagnetic core manufacturing method, which comprises the following steps of: proportioning 67-75 parts of reduced iron powder by weight, 9-11 parts of oxidized iron powder by weight, 2.8-3.2 parts of MnO by weight, 2-5 parts of ZnO by weight, 2-3 parts of modified titanium white powder by weight, 1.5-3 parts of Nb2O5, 2.2-2.8 parts of SnO2 by weight, 0.8-1.2 parts of CaCO3 by weight, 2.5-3.5 parts of Al2O3 by weight and 1.8-2.2 parts of Fe3O4 by weight, and then sequentially conducting pre-sintering, primary ball milling, secondary ball milling, molding and sintering to obtain a Nb2O5-containing ferromagnetic core. The Nb2O5-containing ferromagnetic core manufacturing method has the advantages that the magnetic core formula is reasonable, the preparation method is simple, the saturation induction density of the manufactured magnetic core is higher, the loss is lower, the temperature resistance is higher, the added modified titanium white powder can take a bridge bonding effect among different raw materials, the distribution of the used raw materials is better, the density is high, the crystal boundary resistivity is high, the porosity is low, the grains are large and uniform, the cracks are prevented from occurring during sintering, the texture is compact, the deformation is small, the raw material formula is reasonably improved, the deformation degree is small during sintering, and the magnetic core can be wire-cut, cut, ground and the like.

Description

A kind of Nb that contains 2O 5The manufacture method of ferromagnetic core

Technical field

The invention belongs to powder metallurgy technology, be specifically related to a kind of Nb of containing ₂O ₅The manufacture method of ferromagnetic core.

Background technology

The saturation induction density of magnetic powder core generally is about 9000-11000 Gauss, and iron loss is very large in the alternating electric field of 100-2000 hertz.The sendust core saturation induction density generally is about 5000-9000 Gauss, and iron loss is also lower, but its material mechanical strength is excessively low; Ferritic saturation induction density is about 2700-4200 Gauss, and the iron loss situation is quite good, but saturation induction density is too low, and should not cut.

Summary of the invention

In order to alleviate shortcomings and deficiencies of the prior art, the object of the present invention is to provide a kind of Nb of containing ₂O ₅The manufacture method of ferromagnetic core.

The present invention adopts following technical scheme to achieve these goals:

Contain Nb ₂O ₅The manufacture method of ferromagnetic core, may further comprise the steps:

(1) proportioning of raw material is for calculating by weight reduced iron powder 67-75, brown iron oxide 9-11, MnO 2.8-3.2, ZnO 2-5, modified titanium 2-3, Nb ₂O ₅1.5-3, SnO ₂2.2-2.8, CaCO ₃0.8-1.2, Al ₂O ₃2.5-3.5, Fe ₃O ₄1.8-2.2 described modified titanium prepares by the following method:

A, the trees ashes are soaked 2-3 hour with the sodium hydroxide solution of 15-18% after;

B, usefulness 15-18% hydrochloric acid solution soaked 2-3 hour;

C, with deionized water washing repeatedly be neutral to the trees ashes, dries;

D, be ground to 0.8-1.0 μ m powder, obtain modification trees ashes;

E, in titanium dioxide, add and be equivalent to the modification trees ashes obtained above of its weight 3-5%, the nano silicon of 1-2%, fully be mixed to get;

(2) pre-burning: will remove outside the modified titanium raw material add water and dispersant carried out one time ball milling 1-2 hour, then spray drying is carried out pre-burning, calcined temperature is 870-900 ℃, the pre-burning time is 1-2 hour;

(3) secondary ball milling: with a ball milling material, add entry and dispersant and carried out secondary ball milling 1-2 hour, spray drying, make 180-220 order pellet;

(4) moulding: the secondary ball abrasive material is mixed with modified titanium, 15000-18000 rev/min, high speed dispersion 1-1.5 hour, then add binding agent and be pressed into base;

(5) sintering: put the moulded blank after the above-mentioned moulding into sintering furnace, in the blanket of nitrogen of the long-pending content of 0.05-0.08% oxysome, be warming up to 670-700 ℃ with 160-180 ℃ of/hour speed first, be incubated 1-2 hour; In the blanket of nitrogen of the long-pending content of 0.5-1.2% oxysome, when being warming up to 750-800 ℃ with 120-140 ℃ of/hour speed, be incubated 0.5-1.5 hour; In the blanket of nitrogen of the long-pending content of 3-5% oxysome, be warming up to 1350-1400 ℃ with 80-110 ℃ of/hour speed again, the sintered heat insulating time is 3-5 hour; Behind the sintering in the blanket of nitrogen of the long-pending content of 0.05-0.1% oxysome with after 60-70 ℃ of/hour speed cooling and get final product.

Beneficial effect of the present invention:

Core formulation of the present invention is reasonable, and the preparation method is simple, and the magnetic core saturation induction density that makes is higher, loss is lower, and heatproof is higher, and simultaneously the present invention is by adding the modified titanium composition, can be used as the bridge combination between the different material, the use feed distribution is better, and density is high, the grain boundary resistance rate high, the porosity is low, crystal grain is large and even, can not occur crackle during sintering, dense structure, be out of shape little, the rational modification composition of raw materials, deformation extent is small in the sintering process; Can the line cutting, cutting, grinding etc.

Embodiment

Embodiment 1: contain Nb ₂O ₅The manufacture method of ferromagnetic core, may further comprise the steps:

(1) (jin) calculates reduced iron powder 72, brown iron oxide 10, MnO 3, ZnO 3.5, modified titanium 2.5, Nb to the proportioning of raw material for by weight ₂O ₅2.3, SnO ₂2.5, CaCO ₃1, Al ₂O ₃3, Fe ₃O ₄2, described modified titanium prepares by the following method:

A, the trees ashes are soaked 2-3 hour with 15% sodium hydroxide solution after;

B, soaked 2-3 hour with 15% hydrochloric acid solution;

C, with deionized water washing repeatedly be neutral to the trees ashes, dries;

D, be ground to 0.8-1.0 μ m powder, obtain modification trees ashes;

E, in titanium dioxide, add and be equivalent to the modification trees ashes obtained above of its weight 4%, 1.5% nano silicon, fully be mixed to get;

(2) pre-burning: will remove outside the modified titanium raw material add water and dispersant carried out one time ball milling 1-2 hour, then spray drying is carried out pre-burning, calcined temperature is 880 ℃, the pre-burning time is 1-2 hour;

(3) secondary ball milling: with a ball milling material, add entry and dispersant and carried out secondary ball milling 1-2 hour, spray drying, make 200 order pellets;

(4) moulding: the secondary ball abrasive material is mixed with modified titanium, 16500 rev/mins, high speed dispersion 1-1.5 hour, then add binding agent and be pressed into base;

(5) sintering: put the moulded blank after the above-mentioned moulding into sintering furnace, in the blanket of nitrogen of the long-pending content of 0.05-0.08% oxysome, be warming up to 690 ℃ with 170 ℃ of/hour speed first, be incubated 1-2 hour; In the blanket of nitrogen of the long-pending content of 0.5-1.2% oxysome, when being warming up to 770 ℃ with 130 ℃ of/hour speed, be incubated 0.5-1.5 hour; In the blanket of nitrogen of the long-pending content of 3-5% oxysome, be warming up to 1380 ℃ with 95 ℃ of/hour speed again, the sintered heat insulating time is 3-5 hour; Behind the sintering in the blanket of nitrogen of the long-pending content of 0.05-0.1% oxysome with after 65 ℃ of/hour speed coolings and get final product.

The saturation induction density of the magnetic core that makes by above-described embodiment is in 13800-15500 Gauss; Be that 0.5 millimeter non-oriented silicon steel sheet is compared with thickness in 400 hertz situation, reduce iron loss 89%, low temperature type magnetic core can reach 495 ℃; The high temperature type magnetic core can reach 825 ℃; Initial permeability reaches 6600-7800 when 10KHz; Utilize magnetic core of the present invention to use in the alternating electric field of 200-1100 hertz, compare with ferrite, volume can be contracted to 35-38%.

Claims (1)

1. one kind contains Nb ₂O ₅The manufacture method of ferromagnetic core, it is characterized in that may further comprise the steps:

(1) proportioning of raw material is for calculating by weight reduced iron powder 67-75, brown iron oxide 9-11, MnO 2.8-3.2, ZnO 2-5, modified titanium 2-3, Nb ₂O ₅1.5-3, SnO ₂2.2-2.8, CaCO ₃0.8-1.2, Al ₂O ₃2.5-3.5, Fe ₃O ₄1.8-2.2 described modified titanium prepares by the following method:

A, the trees ashes are soaked 2-3 hour with the sodium hydroxide solution of 15-18% after;

B, usefulness 15-18% hydrochloric acid solution soaked 2-3 hour;

C, with deionized water washing repeatedly be neutral to the trees ashes, dries;

D, be ground to 0.8-1.0 μ m powder, obtain modification trees ashes;

E, in titanium dioxide, add and be equivalent to the modification trees ashes obtained above of its weight 3-5%, the nano silicon of 1-2%, fully be mixed to get;

(2) pre-burning: will remove outside the modified titanium raw material add water and dispersant carried out one time ball milling 1-2 hour, then spray drying is carried out pre-burning, calcined temperature is 870-900 ℃, the pre-burning time is 1-2 hour;

(3) secondary ball milling: with a ball milling material, add entry and dispersant and carried out secondary ball milling 1-2 hour, spray drying, make 180-220 order pellet;

(4) moulding: the secondary ball abrasive material is mixed with modified titanium, 15000-18000 rev/min, high speed dispersion 1-1.5 hour, then add binding agent and be pressed into base;

(5) sintering: put the moulded blank after the above-mentioned moulding into sintering furnace, in the blanket of nitrogen of the long-pending content of 0.05-0.08% oxysome, be warming up to 670-700 ℃ with 160-180 ℃ of/hour speed first, be incubated 1-2 hour; In the blanket of nitrogen of the long-pending content of 0.5-1.2% oxysome, when being warming up to 750-800 ℃ with 120-140 ℃ of/hour speed, be incubated 0.5-1.5 hour; In the blanket of nitrogen of the long-pending content of 3-5% oxysome, be warming up to 1350-1400 ℃ with 80-110 ℃ of/hour speed again, the sintered heat insulating time is 3-5 hour; Behind the sintering in the blanket of nitrogen of the long-pending content of 0.05-0.1% oxysome with after 60-70 ℃ of/hour speed cooling and get final product.