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Method for preparing MnZn ferrite

A technology of ferrite and iron salt, which is applied in the field of preparing MnZn ferrite, can solve the problems of uneven microstructure of sintered body, small nanoparticles and easy agglomeration, and low density of green body, so as to improve the density of green body and facilitate dispersion. stability and fluidity, the effect of reducing particle agglomeration

Active Publication Date: 2013-12-04
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problem that when MnZn ferrite is prepared by nano powder, the nano particles are small and easy to agglomerate, the density of the green body is low, and the distribution is uneven, which in turn causes the microstructure of the sintered body to be uneven and poor in performance. Insufficient, provide a new method for preparing MnZn ferrite

Method used

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  • Method for preparing MnZn ferrite
  • Method for preparing MnZn ferrite
  • Method for preparing MnZn ferrite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: the concrete steps of this embodiment are as follows:

[0039] The first step is to prepare MnZn ferrite nanopowder

[0040] Step 1: Weigh 27.802g of ferrous sulfate (0.1mol iron) and dissolve it in 150ml of deionized water, put it in a 500ml beaker for magnetic stirring (stirring speed 300 rpm). Use a graduated cylinder to measure 100ml ammonium bicarbonate (concentration: 0.5mol / L) and 100ml dilute ammonia water (concentration: 5wt%) and pour them into the separating funnel to mix evenly, slowly add dropwise to the ferrous sulfate solution through the separating funnel (dropping The time is 1.5h), and the precipitation of ferrous particles is carried out. At this time, the pH value of the ferrous sulfate solution is adjusted to 7.2, and the ferrous ions are completely precipitated.

[0041] Step 2: Measure 4.2mL H with a graduated cylinder 2 o 2 The solution was added to the suspension obtained in step 1 to transform the ferrous precipitate into the p...

Embodiment 2

[0052] The first step is to prepare MnZn ferrite nanopowder

[0053] Other steps are the same as in Example 1, and the change is that the nominal chemical formula of the MnZn ferrite nanopowder made is Mn 0.7 Zn 0.2 Fe 2.1 o 4 . (0.1mol iron, 0.0095mol zinc, 0.0333mol manganese)

[0054] The second step is to introduce the coupling agent

[0055] Weigh 10 grams of MnZn ferrite nanopowder, then weigh 0.014gTC-114 according to the mass of silicon element as 0.02% of the mass of the nanopowder, and weigh 0.012gKH-151 according to the mass of titanium element as 0.04% of the mass of the powder, Firstly, the two coupling agents were ultrasonically dispersed with 40 mL of absolute ethanol for 20 min, then the weighed nano-powder was added, ultrasonically stirred for 2 h, and dried at 80°C for 2 h to obtain coated modified nano-powder.

[0056] The third step, add binder molding

[0057] Add polyvinyl butyral (PVB) to the powder obtained in the second step, the amount of which...

Embodiment 3

[0061] The first step, preparation of MnZn ferrite nanobody

[0062] Step 1: Weigh 27.083g of ferrous chloride (0.1mol iron) and dissolve it in 150mL of deionized water, place it in a 500mL beaker and perform magnetic stirring (stirring speed 300 rpm). Use a measuring cylinder to measure 100mL ammonium bicarbonate (concentration: 0.5mol / L) and 100mL dilute ammonia water (concentration: 5wt%) into the separating funnel and mix evenly, slowly add dropwise to the ferrous sulfate solution through the separating funnel (drop The time is 1.0h), and the precipitation of ferrous particles is carried out. At this time, the pH value of the ferrous sulfate solution is adjusted to 7.8, and the ferrous ions are completely precipitated.

[0063] Step 2: Measure 5.6mL H with a graduated cylinder 2 o 2The solution was added to the suspension obtained in step 1 to transform the ferrous precipitate into the precursor δ-FeOOH, and the reaction continued for 0.5 h to completely change the color...

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Abstract

The invention relates to a method for preparing MnZn ferrite. The method comprises the following steps of: carrying out reflux conversion by using ammonium bicarbonate and ammoniacal liquor as precipitating agents, carrying out coating modification by compounding silane and a titanate coupling agent before moulding to prepare an MnZn ferrite nanometer powder with a monoatomic coating, utilizing good reactivity between hydrolysable groups of a coupling agent and the surface of the nanometer powder; adding an organic binder; allowing other atoms in the coupling agent to form a gas and volatilize during the subsequent sintering process with Si<4+> and Ti<4+> left in MnZn ferrite, and raising grain boundary resistance at enriched crystal boundary so as to reduce loss, conduct the doping function and raise magnetic properties of the product. By the adoption of the method, microstructure of MnZn ferrite is improved; density and magnetic properties of MnZn ferrite are raised; density of a sintered body reaches 5.03 g / cm<3>; saturated magnetic induction density Ms, remanent magnetization Mr and coercive force Hc are respectively 102.8 emu / g, 6.3 emu / g and 20.5 Oe; and saturation magnetic flux density Bs reaches 416 mT.

Description

technical field [0001] The invention relates to a method for preparing MnZn ferrite, belonging to the technical field of ferrite magnetic materials. Background technique [0002] MnZn ferrite has become an important magnetic material for high-frequency transformers, choke coils and noise filters due to its high saturation magnetization and low loss. With the development trend of high frequency, miniaturization and thinning of electronic information devices, higher requirements are put forward for MnZn ferrite. High-performance MnZn ferrite should have pure components, uniform and dense microstructure, and be doped according to performance requirements. [0003] At present, MnZn ferrite soft magnetic materials are prepared by conventional high-temperature solid-state reaction, which not only requires high purity of raw materials, but also increases production costs, and is difficult to mix evenly, and the microstructure is uneven; It is very volatile; before and after calci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 王新王桂新侯强李兴华
Owner HEBEI UNIV OF TECH
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