High performance low temperature sintered hexagonal M-type strontium ferrite and preparation method thereof

A low-temperature sintering and strontium ferrite technology, which is applied in the field of high-performance low-temperature sintering hexagonal M-type strontium ferrite and its preparation, can solve the problems of sintering density, saturation magnetization, poor coercive force and electromagnetic properties, etc.

Inactive Publication Date: 2016-12-07
CHENGDU UNIV OF INFORMATION TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a high-performance low-temperature sintered hexagonal crystal M-type strontium ferrite and its preparation method, aiming at solving the problem of preparing MFe by traditional solid-phase method. 12 o 19 Ferrite has the problem of poor sintering density, saturation magnetization, coercive force, and electromagnetic loss of low-temperature sintered materials.

Method used

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  • High performance low temperature sintered hexagonal M-type strontium ferrite and preparation method thereof

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preparation example Construction

[0066] Such as figure 1 As shown, the preparation method of the high-performance low-temperature sintered hexagonal M-type strontium ferrite in the embodiment of the present invention includes the following steps:

[0067] S101: SrCO 3 , Fe 2 o 3 , La 2 o 3 、Ni 2 o 3 Powder raw material according to Sr 1-x La x Fe 2n-y Ni y o 19 (x=0~0.3, y=0~0.3, n=5.5~5.9) chemical formula for batching, and put it into a stainless steel ball mill tank for ball milling and mixing for 2 to 4 hours. The speed of the ball mill is set to 400 rpm. The quality is 10:1, and the ball milling medium is deionized water;

[0068] S102: Put the ball-milled raw material of S101 in a drying oven, dry it at 80-120°C, pass it through a 40-mesh sieve after drying, and obtain a powder with uniform particles;

[0069] S103: putting the powder obtained in S102 into a high-temperature sintering furnace, and pre-sintering at 1250-1300° C. for 2-4 hours;

[0070] S104: the powder and Pwt% Bi after pr...

Embodiment 1

[0079] 1. According to Sr 0.9 La 0.1 Fe 11.7 Ni 0.1 o 19 Components are batched, and the SrCO with a purity greater than 99.9wt% is weighed 3 -12.28g, Fe 2 o 3 -86.32g, La 2 o 3 -0.64g, Ni 2 o 3 -0.76g, a total of 100g of powder; put 100g of powder and 1000g of balls into a stainless steel ball mill tank, add an appropriate amount of deionized water, and mill on a planetary ball mill for 4 hours, with the speed of the ball mill set at 400 rpm;

[0080] 2. Put the ball-milled raw material in a drying oven, dry it at 120°C and pass it through a 40-mesh sieve to obtain a powder with uniform particles; pre-fire the powder at 1250°C for 2 hours;

[0081] 3. Weigh 80g of the pre-fired powder and put it into the ball mill jar, and weigh 1wt% Bi 2 o 3 -0.8g and 1wt% of V 2 o 5 -0.8g was added to the ball mill jar, and then 800g of balls were weighed and added to the mill jar, an appropriate amount of deionized water was added, and ball milled on a planetary ball mill for...

Embodiment 2

[0087] 1. According to Sr 0.8 La 0.2 Fe 11.7 Ni 0.1 o 19 Components are batched, and the SrCO with a purity greater than 99.9wt% is weighed 3 -11.0g, Fe 2 o 3 -86.94g, La 2 o 3 -1.29g, Ni 2 o 3 -0.77g, a total of 100g of powder; add 100g of powder and 1000g of magic balls into a stainless steel ball mill tank, add an appropriate amount of deionized water, and mill on a planetary ball mill for 4 hours, with the speed of the ball mill set at 400 rpm;

[0088] 2. Put the ball-milled raw material in a drying oven, dry it at 120°C and pass it through a 40-mesh sieve to obtain a powder with uniform particles; pre-fire the powder at 1250°C for 2 hours;

[0089] 3. Weigh 80g of the pre-fired powder and put it into the ball mill jar, and weigh 1wt% Bi 2 o 3 -0.8g and 1wt% of V 2 o 5 -0.8g was added to the ball mill jar, and then 800g of balls were weighed and added to the mill jar, an appropriate amount of deionized water was added, and ball milled on a planetary ball mil...

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Abstract

The invention discloses high performance low temperature sintered hexagonal M-type strontium ferrite and a preparation method thereof. According to the preparation method, based on SrFe12O19 ferrite, deficient iron and La<3+> replace Sr<2+>, Ni<2+> replaces Fe<3+>, SrCO3, Fe2O3, La2O3 and Ni2O3 powdery raw materials are blended according to a chemical formula of Sr1-xLaxFe2n-yNiyO19, x represents 0-0.3, y represents 0-0.3, n represents 5.5-5.9, Bi2O3 and V2O5 are used as sintering aids and a hot pressing sintering process and sintering aids such as Bi2O3 and V2O5 are combined. The preparation method has simple processes and does not produce pollution in the process. The produced strontium ferrite has high sintering density, saturation magnetization, intrinsic coercivity and DC resistivity and has a great meaning and value of solving the prominent problem of deficiency of a key substrate material in the existing LTCC circulator.

Description

technical field [0001] The invention belongs to the technical field of microwave ferrite materials, in particular to a high-performance low-temperature sintered hexagonal M-type strontium ferrite and a preparation method thereof. Background technique [0002] At present, the in-depth development of low-temperature co-fired ceramics (LTCC) technology plays an important role in promoting the miniaturization and integration of microwave communication systems, and the development is very rapid. However, after the successful development of various LTCC passive components such as multilayer chip inductors, transformers, and filters, research on non-reciprocal microwave ferrite devices such as circulators, isolators, and phase shifters in the LTCC technology field is still ongoing. No major breakthrough has been made, which greatly restricts the development of microwave LTCC integrated components and systems. The low-temperature sintering and performance regulation of microwave fe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622C04B35/645
CPCC04B35/2633C04B35/622C04B35/645C04B2235/3213C04B2235/3227C04B2235/3239C04B2235/3272C04B2235/3279C04B2235/3298C04B2235/767C04B2235/96
Inventor 彭龙李乐中胡跃斌贾博
Owner CHENGDU UNIV OF INFORMATION TECH
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