High performance rare-earth composite ferrite with low temperature coefficient and manufacturing technology thereof
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A low temperature coefficient, rare earth composite technology, applied in the direction of inorganic material magnetism, can solve the problems of high reversible temperature temperature coefficient, backward technology, affecting application, etc., to achieve the effect of improving temperature coefficient
Inactive Publication Date: 2008-12-24
潘树明
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Problems solved by technology
The technology is relatively backward, the temperature coefficient of reversible temperature is high, and the magnetic performance is low, which affects its wider application
Method used
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Embodiment 1
[0040] Raw materialSrCO 3 、Nd 2 o 3 , ZnO, Fe 2 o 3 , press Sr 0.71 Nd 0.29 Fe 11.71 Zn 0.29 o 19 The ingredients are weighed, dried after mixing in a sand mill, put into a granulator to granulate, put into a kiln for pre-calcination, heat up to 1200°C in the air for sintering for 1 hour, crush and add SiO 2 , CaCO 3 Pulverize in a vibrating dry ball mill, add xylene as a grinding solvent, add a dispersant 1.2wt% oleic acid dispersant, put it in a wet magnetic field forming machine, shape it in a magnetic field, put it in a kiln for sintering, and keep it warm at 1220 ° C for 1 Hours, rapidly cooled to 300°C, slowly cooled below 300°C to room temperature, and measured magnetic properties after room temperature. The magnetic properties measured in the magnetic parameter measurement are as follows: Br=462mT, jHc=207.9KA / m, bHc=205KA / m, (BH) max =41.37KJ / m 3 , Ir / Ix=98.1%, measured coercive force temperature coefficient 25℃, 0.18%℃ -1 .
Embodiment 2
[0042] Raw materialSrCO 3 , La 2 o 3 , ZnO, Fe 2 o 3 , press Sr 0.71 La 0.29 Fe 11.71 Zn 0.29 o 19 Batching is weighed, and other is with embodiment 1, records magnetic property as follows: Br=461.5mT, jHc=207.5KA / m, bHc=205.5KA / m, (BH) max =41.35KJ / m 3 .
Embodiment 3
[0044] Raw materialSrCO 3 , (PrNd) 2 o 3 (Pr accounts for 40% Nd60%), ZnO, Fe 2 o 3 , press Sr 0.71 (NdPr) 0.29 Fe 11.71 Zn 0.29 o 19 Batching is weighed, and other is with embodiment 1, records magnetic property as follows: Br=461.65mT, jHc=207.7KA / m, bHc=206.2KA / m, (BH) max =41.36KJ / m 3 .
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Abstract
The invention relates to a high-performance rare earth composite ferrite with low temperature coefficient and a manufacturing process technology thereof, which is characterized in that: (1) burdening is carried out according to a stoichiometry mol ratio that is as follows: Sr1-XPX (Fe12-YMy) 2O19, wherein, X is less than or equal to 0.55 and is more than or equal to 0.03; Z is less than or equal to 1.3 and is more than or equal to 0.6; M is equal to Zn, Ca, Al, Co and Si; evenly mixing, pelleting, sintering at a temperature of 1190 to 1210 DEG C for 1 to 1.5h, grinding, adding with dimethylbenzene, molding in a magnetic field and multi-section sintering at a temperature of 1210 to 1240 DEG C are carried out in sequence; (2) according to Ba1-XPX (Fe12-YMY) 2O19 (wherein, X, Z and M are the same as (1)), preburning at a temperature of 1280 to 1295 DEG C for 2h, milling, molding in a magnetic field and multi-section sintering at a temperature of 1000 DEG C and 1150 DEG C to 1300 DEG C are carried out in sequence. Temperature coefficient is improved and magnetic performance is increased. High-quality ferrites with high performance and low temperature coefficient are obtained.
Description
technical field [0001] The invention belongs to the field of magnetism and magnet materials, in particular to a permanent magnet ferrite and a manufacturing method thereof. Background technique [0002] Permanent magnet ferrite is a magnetic material developed in the 20th century. This material is very active in the high-tech fields of industrial production, electronics industry, agriculture and machinery industry. For example, permanent magnets in electro-acoustic devices account for about 50% of permanent magnets, followed by applications in motors accounting for 30%, and there is a growing trend. The performance-price ratio of permanent magnet ferrite is better than that of metal permanent magnet materials. In the past two decades, some new magnetic materials have come out continuously, especially the output of high-performance rare earth permanent magnets has continued to expand. By 2006, the output of permanent magnets is still about 10 times that of high-performance r...
Claims
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