CN106252013B - 一种μ=60铁镍软磁磁粉芯的制备方法 - Google Patents
一种μ=60铁镍软磁磁粉芯的制备方法 Download PDFInfo
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14708—Fe-Ni based alloys
- H01F1/14733—Fe-Ni based alloys in the form of particles
- H01F1/14741—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together
- H01F1/1475—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together the particles being insulated
-
- B22F1/0003—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/142—Thermal or thermo-mechanical treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/16—Metallic particles coated with a non-metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
Abstract
本发明公开了一种μ=60铁镍软磁磁粉芯的制备方法。它利用气雾化FeNi粉末,通过铁镍粉末的粒度配比、粉末退火处理、绝缘包覆、压制成型、磁芯热处理及表面涂层工艺,来实现μ=60铁镍软磁磁粉芯的制备。本发明的有益效果是:所需的设备以及工艺简单,成本低;产品性能优异,有较高的直流叠加性能,很低的功率损耗及较高的品质因数,达到行业领先水平;避免了有机粘结剂的使用,提高磁粉芯热处理温度的同时,也减少有机物在热处理过程中产生的废气污染。
Description
技术领域
本发明涉及软磁材料相关技术领域,尤其是指一种μ=60铁镍软磁磁粉芯的制备方法。
背景技术
金属软磁磁粉芯具有高饱和磁感应强度、高居里温度和高直流叠加性能等优点,被广泛应用于大电流功率器件中。其中,铁镍软磁磁粉芯的直流叠加性能最佳,且具有较高的饱和磁感应强度、高居里温度、低磁致伸缩系数 (噪音小)和低成本等优点,因此具有很大的市场容量。
专利号CN201110133836.5的发明专利公开了一种铁镍软磁合金材料的制造方法,该工艺采用磷酸钝化后加入酚醛树脂进行粘结,再压制成型。有机树脂的加入,可以在一定程度上降低涡流损耗,但磁芯的热处理温度受树脂特性的限制,不能很好消除磁芯的内应力,同时有机树脂的分解容易产生裂纹,降低磁粉的绝缘性,从而影响磁粉芯的功率损耗等性能。
专利号CN200610018160.4的发明专利公开了利用水雾化铁镍磁粉,通过粉末退火处理,绝缘包覆制备出铁镍磁粉芯,但由于水雾化粉末的氧含量高,且粉末形状为不规则片状结构,因此该磁粉芯的直流叠加性能以及损耗性能都较差。
发明内容
本发明是为了克服现有技术中存在上述的不足,提供了一种直流叠加性能好以及损耗低的μ=60铁镍软磁磁粉芯的制备方法。
为了实现上述目的,本发明采用以下技术方案:
一种μ=60铁镍软磁磁粉芯的制备方法,利用气雾化FeNi粉末,通过铁镍粉末的粒度配比、粉末退火处理、绝缘包覆、压制成型、磁芯热处理及表面涂层工艺,来实现μ=60铁镍软磁磁粉芯的制备,具体操作步骤如下:
(1)粉末粒度配比:将气雾化FeNi粉末按+45μm和-45μm两种粒度进行分级,然后按+45μm∶-45μm=2∶3的比例混合均匀;
(2)粉末退火:将步骤(1)得到的混合磁粉,放入退火炉中,并通入氢气和氮气中的一种或两种,温度控制在800℃~900℃,热处理时间1~6h;
(3)绝缘包覆:把退火后的铁镍磁粉加入到磷酸二氢铝溶液中,焙炒至干燥后,再加入到水玻璃和高岭土的混合溶液中,继续焙炒至干燥;
(4)压制成型:成型压力为15~25吨/cm2;
(5)磁芯热处理:在氮气的保护气氛下,温度控制在750℃~850℃,保温时间40~60min;
(6)表面涂层:磁粉芯表面用环氧树脂喷涂。
其中:在步骤(2)中,通入氢气和氮气中的一种或两种,是为了防止混合磁粉在退火过程中被氧化。使用本方法制备得到的铁镍软磁磁粉芯的直流叠加性能在85%以上(100Oe),在25℃时该磁粉芯的功率损耗在700kW/m3以下(测试条件:100kHz/100mT),且具有较高的品质因数,产品性能优异,达到行业领先水平。
作为优选,在步骤(1)中,气雾化FeNi粉末中镍的含量为42-50%,余量为铁。
作为优选,在步骤(3)中,磷酸二氢铝的量为铁镍磁粉重量的0.5%~2%,水玻璃的量为铁镍磁粉重量的0.5%~2%,高岭土的量为铁镍磁粉重量的0.5%~1%,焙炒温度为120℃~180℃。
作为优选,在步骤(4)中,压制成型时加入脱模剂,所述脱模剂为硬脂酸盐、滑石粉、二硫化钼中的一种或几种。
作为优选,所述脱模剂的量为铁镍磁粉重量的0.3%~1%。
本发明的有益效果是:所需的设备以及工艺简单,成本低;产品性能优异,有较高的直流叠加性能,很低的功率损耗及较高的品质因数,达到行业领先水平;避免了有机粘结剂的使用,提高磁粉芯热处理温度的同时,也减少有机物在热处理过程中产生的废气污染。
具体实施方式
下面结合具体实施方式对本发明做进一步的描述。
实施例1
取气雾化FeNi粉末,其中镍的含量为50%,余量为铁,用超声振动筛将其按+45μm和-45μm两种粒度进行分级,然后按+45μm∶-45μm=2∶3的比例混合均匀;放入退火炉中,通氮气,800℃保温6h;把磁粉加入到磷酸二氢铝溶液中加热到150℃焙炒至干燥,冷却后,再把磁粉加入到水玻璃和高岭土混合溶液中加热至150℃焙炒至干燥,其中磷酸二氢铝的量为铁镍磁粉重量的1%,水玻璃的量为铁镍磁粉重量的1.2%,高岭土的量为铁镍磁粉重量的0.8%;压制成型前加入铁镍磁粉重量的1%的二硫化钼作为脱模剂,混合均匀后,压制成27mm*14.6mm*11.2mm的磁环,成型压力位20吨/cm2;将成型后的磁芯在氮气气氛下,850℃保温50min进行热处理;冷却后在磁芯表面喷涂环氧树脂,固化后得到μ=60铁镍磁粉芯。经检测,得到的铁镍磁粉芯的磁性能如表1所示。
实施例2
取气雾化FeNi粉末,其中镍的含量为45%,余量为铁,用超声振动筛将其按+45μm和-45μm两种粒度进行分级,然后按+45μm∶-45μm=2∶3的比例混合均匀;放入退火炉中,通氢气,900℃保温1h;把磁粉加入到磷酸二氢铝溶液中加热到180℃焙炒至干燥,冷却后,再把磁粉加入到水玻璃和高岭土混合溶液中加热至180℃焙炒至干燥,其中磷酸二氢铝的量为铁镍磁粉重量的2%,水玻璃的量为铁镍磁粉重量的0.5%,高岭土的量为铁镍磁粉重量的0.5%;压制成型前加入铁镍磁粉重量的0.8%的硬脂酸盐作为脱模剂,混合均匀后,压制成27mm*14.6mm*11.2mm的磁环,成型压力位25吨/cm2;将成型后的磁芯在氮气气氛下,750℃保温60min进行热处理;冷却后在磁芯表面喷涂环氧树脂,固化后得到μ=60铁镍磁粉芯。经检测,得到的铁镍磁粉芯的磁性能如表1所示。
实施例3
取气雾化FeNi粉末,其中镍的含量为42%,余量为铁,用超声振动筛将其按+45μm和-45μm两种粒度进行分级,然后按+45μm∶-45μm=2∶3的比例混合均匀;放入退火炉中,通氮气和氢气的混合气体,850℃保温3h;把磁粉加入到磷酸二氢铝溶液中加热至120℃焙炒至干燥,冷却后,再把磁粉加入到水玻璃和高岭土混合溶液中加热到120℃焙炒至干燥,其中磷酸二氢铝的量为铁镍磁粉重量的0.5%,水玻璃的量为铁镍磁粉重量的2%,高岭土的量为铁镍磁粉重量的1%;压制成型前加入铁镍磁粉重量的0.3%的硬脂酸盐和滑石粉的混合物作为脱模剂,混合均匀后,压制成 27mm*14.6mm*11.2mm的磁环,成型压力位15吨/cm2;将成型后的磁芯在氮气气氛下,800℃保温40min进行热处理;冷却后在磁芯表面喷涂环氧树脂,固化后得到μ=60铁镍磁粉芯。经检测,得到的铁镍磁粉芯的磁性能如表1 所示。
表1实施例磁粉芯性能
由表1可知,使用本方法制备得到的铁镍软磁磁粉芯的直流叠加性能在 85%以上(100Oe),在25℃时该磁粉芯的功率损耗在700kW/m3以下(测试条件:100kHz/100mT),达到行业领先水平。
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。
Claims (4)
1.一种μ=60铁镍软磁磁粉芯的制备方法,其特征是,利用气雾化FeNi粉末,通过铁镍粉末的粒度配比、粉末退火处理、绝缘包覆、压制成型、磁芯热处理及表面涂层工艺,来实现μ=60铁镍软磁磁粉芯的制备,具体操作步骤如下:
(1)粉末粒度配比:将气雾化FeNi粉末按﹢45μm和﹣45μm两种粒度进行分级,然后按﹢45μm:﹣45μm=2:3的比例混合均匀,其中气雾化FeNi粉末中镍的含量为42-50%,余量为铁;
(2)粉末退火:将步骤(1)得到的混合磁粉,放入退火炉中,并通入氢气和氮气中的一种或两种,温度控制在800℃~900℃,热处理时间1~6h;
(3)绝缘包覆:把退火后的铁镍磁粉加入到磷酸二氢铝溶液中,焙炒至干燥后,再加入到水玻璃和高岭土的混合溶液中,继续焙炒至干燥;
(4)压制成型:成型压力为15~25吨/cm2;
(5)磁芯热处理:在氮气的保护气氛下,温度控制在750℃~850℃,保温时间40~60min;
(6)表面涂层:磁粉芯表面用环氧树脂喷涂。
2.根据权利要求1所述的一种μ=60铁镍软磁磁粉芯的制备方法,其特征是,在步骤(3)中,磷酸二氢铝的量为铁镍磁粉重量的0.5%~2%,水玻璃的量为铁镍磁粉重量的0.5%~2%,高岭土的量为铁镍磁粉重量的0.5%~1%,焙炒温度为120℃~180℃。
3.根据权利要求1所述的一种μ=60铁镍软磁磁粉芯的制备方法,其特征是,在步骤(4)中,压制成型时加入脱模剂,所述脱模剂为硬脂酸盐、滑石粉、二硫化钼中的一种或几种。
4.根据权利要求3所述的一种μ=60铁镍软磁磁粉芯的制备方法,其特征是,所述脱模剂的量为铁镍磁粉重量的0.3%~1%。
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