CN103588486B - Manganese zinc ferrite powder pre-sintering technology capable of controlling magnetization degree - Google Patents
Manganese zinc ferrite powder pre-sintering technology capable of controlling magnetization degree Download PDFInfo
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- CN103588486B CN103588486B CN201310571858.9A CN201310571858A CN103588486B CN 103588486 B CN103588486 B CN 103588486B CN 201310571858 A CN201310571858 A CN 201310571858A CN 103588486 B CN103588486 B CN 103588486B
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Abstract
The invention discloses a manganese zinc ferrite powder pre-sintering technology capable of controlling the magnetization degree. The manganese zinc ferrite powder is taken and pre-sintered in a sectional rotary kiln, the pre-sintering temperature ranges from 900 DEG C to 1, 050 DEG C, the holding time ranges from 30 min to 50 min, when the temperature in the kiln is decreased to 450 DEG C from the pre-sintering temperature, the cooling rate is controlled to range from 35 DEG C/min to 45 DEG C/min, and the air amount is controlled to range from 0.10 m<3>/s to 0.42 m<3>/s; and when the temperature in the kiln is decreased to 100 DEG C from 450 DEG C, the cooling rate is controlled to range from 40 DEG C/min to 50 DEG C/min, the air amount is controlled to range from 0.21 m<3>/s to 0.42 m<3>/s, and the magnetization degree of the obtained pre-sintered manganese zinc ferrite powder ranges from 0.4 mu H/g to 2.0 mu H/g. The cooling rate and the air feed amount in the manganese zinc ferrite powder pre-sintering technology are regulated, so that problems of production efficiency reduction due to insufficient magnetic force of green bodies, sintering adhesion of a magnetic core of a small-sized product, sintering crack of a magnetic core of a large-sized product and the like can be solved as required, and the manganese zinc ferrite powder pre-sintering technology has the advantages of simple regulation method, convenience in operation, los cost and high benefit.
Description
Technical field
The present invention relates to manganese-zinc ferrite magnetic manufacture of materials technical field, be specifically related to the pre-sinter process that a kind of manganese-zinc ferrite powder controls magnetization degree.
Background technology
At present, in manganese-zinc ferrite core is produced, the adhesion of frequent appearance sintering, sintering problems of crack, affect conforming product rate, and along with the raising of molding procedure automaticity, increasing producer brings into use automatic blank arranging machine, and green compact magnetic force deficiency can cause automatic blank arranging machine cannot continuous operation, affects production efficiency.
About sintering adhesion problems, it is generally acknowledged that Nitrogen ion content height is the main cause causing sintering adhesion, but the section of intensification air draft pipe is unobstructed in nitrogen kiln in reality, generally can not cause sintering adhesion; But magnetization degree too low time, the expansion rate that sintering intensification section blank presents is large, and contraction change is little, easily causes adjacent blank pieces to stick together; Increase blank vent gap and can improve adhesion phenomenon, but be reduction of production efficiency, energy consumption increases; Magnetization degree is too low simultaneously is also the main cause causing green compact magnetic force low.And sinter problem of Cracking be due to magnetization degree too high time, the shrinkage curvilinear motion of blank is excessive, excessive velocities, strong deformation easily occurs and causes cracking.
Summary of the invention
The present invention needs the technical scheme solved to be to provide one can effectively control product magnetization degree, solves product green compact magnetic force deficiency, sinters adhesion, sinters the pre-sinter process that the manganese-zinc ferrite powder of problem of Cracking controls magnetization degree.
The technical solution used in the present invention is: a kind of manganese-zinc ferrite powder controls the pre-sinter process of magnetization degree, get manganese-zinc ferrite powder, pre-burning in segmented revolution cellar for storing things, calcined temperature is 900 DEG C ~ 1050 DEG C, temperature retention time is 30 ~ 50 minutes, in cellar for storing things, temperature is when being down to 450 DEG C from calcined temperature, and cooling rate controls at 35 DEG C/min ~ 45 DEG C/min, and air capacity controls at 0.10m
3/ s ~ 0.42m
3/ s; In cellar for storing things, temperature is when being down to 100 DEG C from 450 DEG C, and cooling rate controls at 40 DEG C/min ~ 50 DEG C/min, and air capacity controls at 0.21m
3/ s ~ 0.42m
3/ s, the magnetization degree of the pre-burning manganese-zinc ferrite powder obtained is 0.4 ~ 2.0 μ H/g.
Preferably, the magnetization degree of this pre-burning manganese-zinc ferrite powder is 0.6 ~ 1.7 μ H/g
By the cooling rate in adjustment manganese-zinc ferrite pre-sinter process and air inlet amount, green compact magnetic force deficiency can be solved as required and reduce production efficiency, the adhesion of small-size product magnetic core sintering, large scale product magnetic core sintering problems of crack, there is method of adjustment simple, operation is convenient, and cost is low, the advantage of high efficiency.
Embodiment:
Can understand the present invention further by specific embodiment of the invention case given below, but they not limitation of the invention.
Embodiment 1
Get manganese-zinc ferrite powder, pre-burning in segmented revolution cellar for storing things, calcined temperature is 900 DEG C, and temperature retention time is 50 minutes, and when in cellar for storing things, temperature is down to 450 DEG C from 900 DEG C, cooling rate controls at 35 DEG C/min, and air capacity controls at 0.42m
3/ s; When in cellar for storing things, temperature is down to 100 DEG C from 450 DEG C, cooling rate controls at 40 DEG C/min, and air capacity controls at 0.21m
3/ s, the magnetization degree of the pre-burning manganese-zinc ferrite powder obtained is 0.4 μ H/g.
Embodiment 2
Get manganese-zinc ferrite powder, pre-burning in segmented revolution cellar for storing things, calcined temperature is 940 DEG C, and temperature retention time is 40 minutes, and when in cellar for storing things, temperature is down to 450 DEG C from 940 DEG C, cooling rate controls at 37 DEG C/min, and air capacity controls at 0.35m
3/ s; When in cellar for storing things, temperature is down to 100 DEG C from 450 DEG C, cooling rate controls at 43 DEG C/min, and air capacity controls at 0.30m
3/ s, the magnetization degree of the pre-burning manganese-zinc ferrite powder obtained is 0.6 μ H/g.
Embodiment 3
Get manganese-zinc ferrite powder, pre-burning in segmented revolution cellar for storing things, calcined temperature is 980 DEG C, and temperature retention time is 37 minutes, and when in cellar for storing things, temperature is down to 450 DEG C from 980 DEG C, cooling rate controls at 40 DEG C/min, and air capacity controls at 0.27m
3/ s; When in cellar for storing things, temperature is down to 100 DEG C from 450 DEG C, cooling rate controls at 45 DEG C/min, and air capacity controls at 0.33m
3/ s, the magnetization degree of the pre-burning manganese-zinc ferrite powder obtained is 1.1 μ H/g.
Embodiment 4
Get manganese-zinc ferrite powder, pre-burning in segmented revolution cellar for storing things, calcined temperature is 1010 DEG C, and temperature retention time is 35 minutes, and when in cellar for storing things, temperature is down to 450 DEG C from 1010 DEG C, cooling rate controls at 43 DEG C/min, and air capacity controls at 0.21m
3/ s; When in cellar for storing things, temperature is down to 100 DEG C from 450 DEG C, cooling rate controls at 47 DEG C/min, and air capacity controls at 0.35m
3/ s, the magnetization degree of the pre-burning manganese-zinc ferrite powder obtained is 1.7 μ H/g.
Embodiment 5
Get manganese-zinc ferrite powder, pre-burning in segmented revolution cellar for storing things, calcined temperature is 1050 DEG C, and temperature retention time is 30 minutes, and when in cellar for storing things, temperature is down to 450 DEG C from 1050 DEG C, cooling rate controls at 45 DEG C/min, and air capacity controls at 0.10m
3/ s; When in cellar for storing things, temperature is down to 100 DEG C from 450 DEG C, cooling rate controls at 50 DEG C/min, and air capacity controls at 0.42m
3/ s, the magnetization degree of the pre-burning manganese-zinc ferrite powder obtained is 2.0 μ H/g.
Manganese-zinc ferrite has the process of oxygen uptake in pre-burning temperature-fall period, oxygen absorbed increases can generate the magnetic Mn ferrite oxidation of band by partial reaction during pre-burning, namely material magnetic is reduced, shows as magnetization degree and reduce, also degree of oxidation and magnetization degree be inversely.
Manganese-zinc ferrite has the process of expansion-contraction in sintering process between 300 DEG C ~ 800 DEG C, the blank that magnetization degree is lower is inflationary spiral when heating up, now can produce between two blanks and contact because of expansion, after entering high temperature section, contact-making surface reacts and finally causes adhesion; The blank expansion rate that magnetization degree is higher is less, even only there is dull contraction, but the too fast blank that makes of contraction speed is out of shape, and the excessive product that causes of final distortion ftractures.
Magnetization degree, mainly according to above-mentioned principle, by the air capacity of adjustment pre-burning temperature descending section, controls within the specific limits by the present invention.Magnetization degree available instrumentation is tested, enclose with enamelled wire columnar nonmetallic vessel Shangrao 400 at a designated volume, with the inductance value L0 of inductance instrument test air core coil, after Preburning material is filled container, the inductance value L1 of test coil again, then weigh the weight of tested Preburning material, magnetization degree calculates according to the following formula:
x=(L1-L0)/m
Wherein, x: magnetization degree; L0: air cored coil inductors amount, unit is μ H; L1: the inductance value of coil after loading Preburning material, unit is μ H; M: survey the weight of Preburning material, unit is g.
Compared with prior art, the present invention is by the cooling rate in adjustment manganese-zinc ferrite pre-sinter process and air inlet amount, green compact magnetic force deficiency can be solved as required and reduce production efficiency, the adhesion of small-size product magnetic core sintering, large scale product magnetic core sintering problems of crack, have method of adjustment simple, operation is convenient, cost is low, the advantage of high efficiency.
Claims (2)
1. the pre-sinter process of a manganese-zinc ferrite powder control magnetization degree, it is characterized in that getting manganese-zinc ferrite powder, pre-burning in segmented revolution cellar for storing things, calcined temperature is 900 DEG C ~ 1050 DEG C, temperature retention time is 30 ~ 50 minutes, in cellar for storing things, temperature is when being down to 450 DEG C from calcined temperature, and cooling rate controls at 35 DEG C/min ~ 40 DEG C/min, and air capacity controls at 0.10m
3/ s ~ 0.42m
3/ s; In cellar for storing things, temperature is when being down to 100 DEG C from 450 DEG C, and cooling rate controls at 43 DEG C/min ~ 50 DEG C/min, and air capacity controls at 0.21m
3/ s ~ 0.42m
3/ s, the magnetization degree of the pre-burning manganese-zinc ferrite powder obtained is 0.4 ~ 2.0 μ H/g.
2. a kind of manganese-zinc ferrite powder according to claim 1 controls the pre-sinter process of magnetization degree, it is characterized in that the magnetization degree of described pre-burning manganese-zinc ferrite powder is 0.6 ~ 1.7 μ H/g.
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| CN107240495B (en) * | 2017-06-26 | 2018-11-16 | 重庆正峰电子有限公司 | A kind of high density high stability network bead preparation method |
| CN108975897A (en) * | 2018-08-27 | 2018-12-11 | 安洁无线科技（苏州）有限公司 | One-piece type large scale ferrite and its production technology |
| CN113135747A (en) * | 2021-04-26 | 2021-07-20 | 中国电子科技集团公司第九研究所 | Preparation method of microwave ferrite |
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