CN106336209B - 一种永磁铁氧体磁体的生产方法 - Google Patents
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Abstract
本发明公开了一种永磁铁氧体磁体的生产方法,包括以下步骤:(1)将主成份加入球磨机研磨4~6h,得浆料;(2)将浆料压滤脱水,控制浆料的含水量为35~40%;(3)将步骤(2)中物料打入回转窑预烧,在1220~1260℃温度下进行固相反应生成永磁铁氧体预烧料;(4)将永磁铁氧体预烧料球磨成粗粉后,将粗粉与添加剂混合均匀后投入砂磨机进行二次细磨,得细料浆;(5)将细料浆湿压成型得磁瓦毛坯后进行烧结,即得永磁铁氧体磁体。本发明工艺步骤简单,对设备要求低,可操作性强,能耗低,适合工业化应用,制得永磁铁氧体磁体磁性能佳,各批次产品性能一致性好。
Description
技术领域
本发明涉及永磁铁氧体技术领域,尤其是涉及一种永磁铁氧体磁体的生产方法。
背景技术
永磁铁氧体是目前世界上使用量最广、生产量最大的永磁材料,在汽车、家用电器、电机设备等领域得到了非常广泛的应用。
自上世纪五十年代发现永磁铁氧体以来,其品种、生产方法与生产工艺得到了非常大的发展,经历了从各向同性磁体到各向异性磁体、从钡铁氧体到锶铁氧体和从干压成型到湿压成型等重大技术跨越。
永磁铁氧体具有磁性能稳定,抗退磁能力强;不易锈蚀,无需涂覆保护层;质硬而脆,可用于特殊刀具加工、切割;而且价格低廉,使用成本低等优点;因而广泛地适用于汽车、家用电器,工业自动化等行业。
目前常规方法在生产永磁铁氧体磁体时,预烧料在窑内烧结时间长,能耗高,且各批次得到的产品性能一致性差。
发明内容
本发明是为了解决现有技术的永磁铁氧体磁体生产方法所存在的上述问题,提供了一种工艺步骤简单,对设备要求低,可操作性强,能耗低的永磁铁氧体磁体的生产方法,制得永磁铁氧体磁体磁性能佳,各批次产品性能一致性好。
为了实现上述目的,本发明采用以下技术方案:
本发明的一种永磁铁氧体磁体的生产方法,包括以下步骤:
(1)将主成份加入球磨机研磨4~6h,得浆料。
(2)将浆料压滤脱水,控制浆料的含水量为35~40%。本发明中通过压滤机压滤脱水,使浆料的水分为35~40%,既便于浆料畅通进入窑内,且经过脱水后的浆料在回转窑内易干燥,能使氧化气氛充分进入浆料接触,并提前固相反应,从而减少预烧料在窑内时间,节约能耗的同时提高生产效率。
(3)将步骤(2)中物料打入回转窑预烧,在1220~1260℃温度下进行固反应生成永磁铁氧体预烧料。
(4)将永磁铁氧体预烧料球磨成粗粉后,将粗粉与添加剂混合均匀后投入砂磨机进行二次细磨,得细料浆。
(5)将细料浆湿压成型得磁瓦毛坯后进行烧结,即得永磁铁氧体磁体。
作为优选,步骤(1)中,所述主成份由以下质量百分含量的组分组成:13~15%SrO,余量Fe2O3。
作为优选,步骤(4)中,以主成份的质量为基准,添加剂由以下质量百分比的组分组成:0.8~0.9%CaCO3,0.4~0.5%SiO2,0.1~0.2%Al2O3,0.3~0.4%SrCO3,0.4~0.5%分散剂。
作为优选,步骤(4)中,二次细磨的具体步骤为:第一次采用∮6~8mm的钢球砂磨3~4h,第二次采用∮3.5~4.5mm的钢球砂磨2.5~3h。本发明中采用二次细磨以保证细料浆颗粒的均匀性与一致性,从而得到性能更佳的永磁铁氧体磁体,并能使各批次永磁铁氧体磁体的性能保持稳定一致。
作为优选,步骤(5)中,成型磁场为5000~9000Gs。
作为优选,步骤(5)中,烧结温度为1200~1250℃。
因此,本发明具有如下有益效果:
(1)通过压滤机压滤脱水后再进行预烧,使浆料的水分为35~40%,既便于浆料畅通进入窑内,且经过脱水后的浆料在回转窑内易干燥,能使氧化气氛充分进入浆料接触,并提前固相反应,从而减少预烧料在窑内时间,节约能耗的同时提高生产效率;
(2)采用二次细磨以保证细料浆颗粒的均匀性与一致性,从而得到性能更佳的永磁铁氧体磁体,并能使各批次永磁铁氧体磁体的性能保持稳定一致;
(3)对整个工艺进行了优化改进,步骤简单,对设备要求低,可操作性强,能耗低,适合工业化应用。
具体实施方式
下面通过具体实施方式对本发明做进一步的描述。
实施例1
(1)将主成份加入球磨机研磨4h,得浆料,其中主成份由以下质量百分含量的组分组成:13%SrO,余量Fe2O3;
(2)将浆料压滤脱水,控制浆料的含水量为35%;
(3)将步骤(2)中物料打入回转窑预烧,在1220℃温度下进行固相反应生成永磁铁氧体预烧料;
(4)将永磁铁氧体预烧料球磨成粗粉后,将粗粉与添加剂混合均匀后投入砂磨机进行二次细磨,得细料浆,以主成份的质量为基准,添加剂由以下质量百分比的组分组成:0.8%CaCO3,0.4%SiO2,0.1%Al2O3,0.3%SrCO3,0.4%分散剂,二次细磨的具体步骤为:第一次采用∮6mm的钢球砂磨3h,第二次采用∮3.5mm的钢球砂磨2.5h;
(5)将细料浆湿压成型得磁瓦毛坯后进行烧结,即得永磁铁氧体磁体,成型磁场为5000Gs,烧结温度为1200℃。
实施例2
(1)将主成份加入球磨机研磨4~6h,得浆料,其中主成份由以下质量百分含量的组分组成:15%SrO,余量Fe2O3;
(2)将浆料压滤脱水,控制浆料的含水量为40%;
(3)将步骤(2)中物料打入回转窑预烧,在1260℃温度下进行固相反应生成永磁铁氧体预烧料;
(4)将永磁铁氧体预烧料球磨成粗粉后,将粗粉与添加剂混合均匀后投入砂磨机进行二次细磨,得细料浆,以主成份的质量为基准,添加剂由以下质量百分比的组分组成:0.9%CaCO3,0.5%SiO2,0.2%Al2O3,0.4%SrCO3,0.5%%分散剂,二次细磨的具体步骤为:第一次采用∮8mm的钢球砂磨4h,第二次采用∮4.5mm的钢球砂磨3h;
(5)将细料浆湿压成型得磁瓦毛坯后进行烧结,即得永磁铁氧体磁体,成型磁场为9000Gs,烧结温度为1250℃。
实施例3
(1)将主成份加入球磨机研磨5h,得浆料,其中主成份由以下质量百分含量的组分组成:14%SrO,余量Fe2O3;
(2)将浆料压滤脱水,控制浆料的含水量为38%;
(3)将步骤(2)中物料打入回转窑预烧,在1250℃温度下进行固相反应生成永磁铁氧体预烧料;
(4)将永磁铁氧体预烧料球磨成粗粉后,将粗粉与添加剂混合均匀后投入砂磨机进行二次细磨,得细料浆,以主成份的质量为基准,添加剂由以下质量百分比的组分组成:0.85%CaCO3,0.45%SiO2,0.15%Al2O3,0.35%SrCO3,0.45%分散剂,二次细磨的具体步骤为:第一次采用∮7mm的钢球砂磨3.2h,第二次采用∮4mm的钢球砂磨2.7h;
(5)将细料浆湿压成型得磁瓦毛坯后进行烧结,即得永磁铁氧体磁体,成型磁场为7000Gs,烧结温度为1230℃。
通过上述各实施例制得的永磁铁氧体磁体性能如表1所示:
表1各实施例制得的永磁铁氧体磁体性能测试结果
实施例 | Br(Gs) | Hcb(Oe) | Hcj(Oe) | (BH)max(MGOe) |
1 | 4289 | 3218 | 3293 | 4.277 |
2 | 4323 | 3093 | 3163 | 4.314 |
3 | 4211 | 3333 | 3421 | 4.128 |
通过表1可知,各实施例制得的永磁铁氧体磁体磁性能佳,且稳定一致。
以上所述的实施例只是本发明的一种较佳的方案,并非对本发明作任何形式上的限制,在不超出权利要求所记载的技术方案的前提下还有其它的变体及改型。
Claims (1)
1.一种永磁铁氧体磁体的生产方法,其特征在于,包括以下步骤:
(1)将主成分 加入球磨机研磨4~6h,得浆料;所述主成分 由以下质量百分含量的组分组成:13~15% SrO,余量Fe2O3;
(2)将浆料压滤脱水,控制浆料的含水量为35~40%;
(3)将步骤(2)中物料打入回转窑预烧,在1220~1260℃温度下进行固相反应生成永磁铁氧体预烧料;以主成分 的质量为基准,添加剂由以下质量百分比的组分组成:0.8~0.9%CaCO3,0.4~0.5% SiO2,0.1~0.2% Al2O3,0.3~0.4% SrCO3,0.4~0.5%分散剂;
(4)将永磁铁氧体预烧料球磨成粗粉后,将粗粉与添加剂混合均匀后投入砂磨机进行二次细磨,第一次采用∮6~8mm的钢球砂磨3~4h,第二次采用∮3.5~4.5mm的钢球砂磨2.5~3h,得细料浆;
(5)将细料浆湿压成型得磁瓦毛坯后进行烧结,即得永磁铁氧体磁体;成型磁场为5000~9000Gs,烧结温度为1200~1250℃。
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