CN103664154A - Formula and process of Li-Ti-Zn soft magnetic ferrite material with high frequency and high resistivity - Google Patents

The invention discloses a formula and process of a Li-Ti-Zn soft magnetic ferrite material with high frequency and high resistivity, relating to the physical technical field of soft magnetic ferrites. According to the formula, the Li-Ti-Zn soft magnetic ferrite material comprises 50-65mol% of Fe2O3, 1-4mol% of MnO, 10-20mol% of ZnO, 1-4mol% of TiO2, 0.1-0.5mol% of Co2O3, 15-28mol% of Li2CO3 and 0.2-0.8mol% of Bi2O3. The design originality of the formula is as follows: NiO in a nickel-zinc ferrite is replaced with LiCO3 on the premise that the performance of a product is unchanged, so that the production cost is greatly reduced, and the favorable economic benefit and social value are achieved.

High frequency high resistivity Li-Ti-Zn soft magnetic ferrite formula and technique

Technical field:

The present invention relates to soft magnetic ferrite physical technique field, be specifically related to a kind of high frequency high resistivity Li-Ti-Zn soft magnetic ferrite formula and technique.

Background technology:

High performance soft magnetic ferrite technology is compared with proven technique, MnZn Ferrite Material is used 1MHZ to make below inductance ratio conventionally, transformer, concussion circle magnetic core, accounts for 20% of soft magnetic ferrite market, also be the low soft magnetic ferrite of price comparison, but there is following defect in the ferritic technology of MnZn: below the high 1MHZ of being limited to of frequency of utilization, and resistivity is low, and Curie temperature is less than 300 ℃, equipment investment is high, and technology difficulty is large; And NiZn soft magnetic ferrite, resistivity can reach 10 ⁶high-frequency loss is little, Curie temperature high (being less than 500 ℃), and production unit is simpler than MnZn, sintering in air, magnetic permeability is 8～3000, applies extensively especially, is only second to MnZn material, but NiZn ferrite is porous material, moisture-sensitive, is used metal oxide containing precious metals material NiO, and manufacturing cost is high; MnZn Ferrite Material, can partly replace NiZn ferrite, and for 10～100MHz frequency range, technique and NiZn are basic identical, up to the present, Ferrite Material is only limited to deflecting core application, and EMI/RFI magnetic core, low price, filtering performance is poor, and electromagnetic performance is not as NiZn; LiZn soft magnetic ferrite Curie temperature is high, and resistivity is high, and sintering temperature is low, and production unit is relatively simple, energy-conservation, can replace expensive NiZn Ferrite Material, but under hot conditions, Li easily volatilizees in a lot of fields, complex manufacturing, and difficulty is large.

Summary of the invention:

The object of this invention is to provide a kind of high frequency high resistivity Li-Ti-Zn soft magnetic ferrite formula and technique, the originality of formulating of recipe is to use LiCO ₃substitute the NiO in nickel-zinc ferrite, significantly reduced material cost, reduced sintering temperature, thereby saved the energy, there is good economical effectiveness and social value.

The present invention has that Curie temperature is high, a _flittle, λ _sand K ₁also lower, also lower to application susceptibility.The present invention has carried out ion exchange, as Ti, Zn, Mn, Ni, Co etc., by displacement, can obtain the needed electromagnetic property that has using value, meet consumers' demand, and the Li that what is more important the present invention uses ₂cO ₃cost only has 25% of NiO, and compares NiFeO ₂material cost low by 50%.The performance of Li-Ti-Zn soft magnetic ferrite has reached the level of NiZn Ferrite Material.Li-Ti-Zn soft magnetic ferrite is blank on the application foundation of soft magnetism field, on documents and materials and textbook, also cannot consult.

In order to solve the existing problem of background technology, the present invention is by the following technical solutions:

Formula of the present invention is: Fe ₂o ₃(50～65mol%), MnO (1～4mol%), ZnO (10～20mol%), TiO ₂(1～4mol%), Co ₂o ₃(0.1～0.5mol%), Li ₂cO ₃(15～28mol%), Bi ₂o ₃(0.2～0.8mol%).

Technical process of the present invention is: 1, batch mixing: by Fe ₂o ₃, Li ₂cO ₃, MnO, ZnO, TiO ₂, Co ₂o ₃, Bi ₂o ₃by above-mentioned formula, adopt sand mill batch mixing, disperse means are deionized water, material: ball: water=1: 0.8: 5, and mixing time 2 hours, centrifuge dehydration is dried broken, crosses 20 mesh sieves;

2, pre-burning: equipment is air pushed bat kiln (17m), 800 ℃～950 ℃ of presintering room temperatures;

3, abrasive material: adopt 300kg ball mill, Hc >=60, material: water: ball=1: 0.7～0.9: 4, Ball-milling Time is 18 to 24 hours, centrifuge dehydration is dried;

4, granulation: adopt machinery to carry out granulation, tackiness agent is Pcv-1788, Pcv: deionized water=500kg: 45kg, automatic stirring heating for dissolving, broken 70 mesh sieves of crossing of material piece, powder: material: tackiness agent=100: 10: 12, repeatedly roll 3 to 4 times, damping (water content approximately 6%) fragmentation is sieved;

5, moulding: by particulate material damping, water content approximately 3% ± 0.5, adds Zinic stearas 1～1.5%, adopts mixer batch mixing 10～15 minutes, then by 60～140 mesh sieves, particulate material meets forming requirements, compacting mark ring and product.

6, sintering: adopt air pushed bat kiln, sintering temperature is 800 ℃～1000 ℃.

The present invention has following beneficial effect: it has substituted nickel oxide with Quilonum Retard in original formula, has reduced material cost, also enhances product performance, and good product consistency, has saved the energy, has good economical effectiveness and social value.

Embodiment:

This embodiment is taked following technical scheme: the formula of this embodiment is: Fe ₂o ₃(50～65mol%), MnO (1～4mol%), ZnO (10～20mol%), TiO ₂(1～4mol%), Co ₂o ₃(0.1～0.5mol%), Li ₂cO ₃(15～28mol%), Bi ₂o ₃(0.2～0.8mol%).

The technical process of this embodiment is: 1, batch mixing: by Fe ₂o ₃, Li ₂cO ₃, MnO, ZnO, TiO ₂, Co ₂o ₃, Bi ₂o ₃by above-mentioned formula, adopt sand mill batch mixing, disperse means are deionized water, material: ball: water=1: 0.8: 5, and mixing time 2 hours, centrifuge dehydration is dried broken, crosses 20 mesh sieves;

2, pre-burning: equipment is air pushed bat kiln (17m), 800 ℃～950 ℃ of presintering room temperatures;

3, abrasive material: adopt 300kg ball mill, Hc >=60, material: water: ball=1: 0.7～0.9: 4, Ball-milling Time is 18 to 24 hours, centrifuge dehydration is dried;

4, granulation: adopt machinery to carry out granulation, tackiness agent is Pcv-1788, Pcv: deionized water=500kg: 45kg, automatic stirring heating for dissolving, broken 70 mesh sieves of crossing of material piece, powder: material: tackiness agent=100: 10: 12, repeatedly roll 3 to 4 times, damping (water content approximately 6%) fragmentation is sieved;

5, moulding: by particulate material damping, water content approximately 3% ± 0.5, adds Zinic stearas 1～1.5%, adopts mixer batch mixing 10～15 minutes, then by 60～140 mesh sieves, particulate material meets forming requirements, compacting mark ring and product.

6, sintering: adopt air pushed bat kiln, sintering temperature is 800 ℃～1000 ℃.

This embodiment has following beneficial effect: the originality of its formulating of recipe is, is guaranteeing to use LiCO under the constant prerequisite of product performance ₃replace the NiO in nickel-zinc ferrite, thereby significantly reduced production cost, there is good economical effectiveness and social value.