CN105253918B - 一种易分散六角片状W型铁氧体BaZn2Fe16O27的制备方法 - Google Patents

一种易分散六角片状W型铁氧体BaZn2Fe16O27的制备方法 Download PDF

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CN105253918B
CN105253918B CN201510618597.0A CN201510618597A CN105253918B CN 105253918 B CN105253918 B CN 105253918B CN 201510618597 A CN201510618597 A CN 201510618597A CN 105253918 B CN105253918 B CN 105253918B
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冯永宝
王国雨
丘泰
杨建�
李晓云
沈春英
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Abstract

本发明涉及一种易分散六角片状W型铁氧体BaZn2Fe16O27的制备方法,首先按BaZn2Fe16O27的化学计量比称取BaCl2·2H2O、ZnCl2、FeCl3·6H2O和尿素的原始混合溶液进行水热协助均匀共沉淀,然后滴加碱溶液调节pH值至9~11,陈化6~12h,反复过滤清洗至上层清液呈中性,沉淀物烘干,并在沉淀物中加入盐,研磨成粉末,在热处理炉中进行煅烧合成,所得产物用去离子清洗,烘干即得易分散六角片状W型铁氧体BaZn2Fe16O27。本方法制备的易分散六角片状W型铁氧体,在吸波材料领域有着广泛的潜在用途。本发明线路简单、可操作性强、耗能低,具有较大的社会效益和经济效益。

Description

一种易分散六角片状W型铁氧体BaZn2Fe16O27的制备方法
技术领域:
本发明涉及的是一种非金属材料领域的方法,具体涉及的是一种易分散六角片状W型铁氧体BaZn2Fe16O27的制备方法。
背景技术:
铁氧体作为功能无机材料的一种,在当今信息化社会占有举足轻重的作用。1878年人们人工合成了锰-铁磁性氧化物,1932年制成了钴铁氧体,继而开展了软磁铁氧体(尖晶石型)的系统研究。40年代,尖晶石型的软磁铁氧体得到迅速的发展,进入工业生产的规模。1952年制成了磁铅石型的永磁铁氧体,1956年又在此晶系中发展处平面型的超高频铁氧体。同年,发现了稀土族石榴石铁氧体,从而奠定了尖晶石型、磁铅石型、石榴石型三大晶系三足鼎立的局面。铁氧体按晶体结构分类,主要是尖晶石型、石榴石型和六角晶系三大类。六角晶系铁氧体又有M型(AB12O19)、X型(A2Me2B28O46)、Y型(A2Me2B12O22)、U型(A4Me2B36O60)、Z型(A3Me2B24O41)、W型(AMe2B16O27)这六种。其中,W型六角晶形铁氧体由于其高饱和磁化率、高矫顽力、良好的化学稳定性和抗腐蚀性,而适用于电子元器件。又因为它们平面的微观结构,在高频下极好的磁损耗,而非常适合用作电磁干涉抑制和雷达吸波材料。
现今,W型铁氧体磁粉的制备方法主要有固相法、溶胶凝胶法、化学共沉淀法、自蔓延法等。工业上广泛运用的是固相球磨法,固相法操作简单,但是后续煅烧合成温度较高,达到1300℃,甚至以上。诸如溶胶凝胶法、化学共沉淀法、自蔓延法等方法合成温度也要达到1250℃左右。且合成出的铁氧体磁粉容易团聚在一起,不易分散,后续还需球磨。
发明内容:
本发明旨在提供一种易分散六角片状W型铁氧体BaZn2Fe16O27的制备方 法。该方法简便易操作,最后制备出的粉体易于分散,不需再球磨,微观形貌发育完整,呈现规整的六角片状。
本发明的技术方案为:一种易分散六角片状W型铁氧体BaZn2Fe16O27的制备方法,其具体步骤为:按BaZn2Fe16O27的化学计量比称取BaCl2·2H2O、ZnCl2、FeCl3·6H2O和尿素的原始混合溶液进行水热协助均匀共沉淀,然后缓慢滴加碱溶液调节pH值至9~11,陈化,反复过滤清洗至上层清液呈中性,沉淀物烘干,并在沉淀物中加入盐,研磨成粉末,在热处理炉中进行煅烧合成,所得产物用去离子清洗去除盐,烘干即得易分散六角片状W型铁氧体BaZn2Fe16O27。其中碱溶液为NaOH、Na2CO4的混合溶液,盐为NaCl或Na2SO4和KCl或K2SO4的混合物。
优选原始混合溶液中BaCl2·2H2O与尿素的摩尔比为1:(50~200);更优选原始溶液中BaCl2·2H2O与尿素的摩尔比为1:(70~150)。
优选陈化时间为6~12h。
优选水热法协助共沉淀的反应温度为160℃~210℃,反应时间为4h~12h。
优选上述的碱溶液为NaOH和Na2CO3的混合溶液;其中NaOH和Na2CO3摩尔比为3~8:1。优选用碱溶液调节的pH值至9~10.5。
优选所述的盐为NaCl、Na2SO4、KCl或K2SO4中的任意一种或几种的混合物;沉淀物与盐的质量比为1:(0.4~1)。
优选所述的热处理炉中反应温度为1150℃~1300℃,反应时间为1h~3h。更优选热处理炉中反应温度为1150℃~1250℃。
有益效果:
本发明提供了一种易分散六角片状W型铁氧体BaZn2Fe16O27的制备方法,能够在1150℃~1300℃的温度条件下制备出六角片状微观形貌发育完整的W型铁氧体,且制备出的铁氧体易于分散,不需后续的球磨即可得到磁粉。该方法易于操作,可控性强。
附图说明:
图1为具体实施例2制备出的铁氧体磁粉的X射线衍射图谱(XRD);
图2为具体实施例2制备出的铁氧体磁粉的扫描电镜图(SEM)。
具体实施方式:
实施例1:
将4.89g BaCl2·2H2O、5.45g ZnCl2、86.49g FeCl3·6H2O、60.04g尿素加入1000mL的蒸馏水配制成均匀混合溶液,将400mL混合溶液转移至容量为500mL水热反应釜反应釜中,水热反应温度160℃,保温12h。水热协助均匀共沉淀后溶液用碱溶液(摩尔比NaOH:Na2CO3=8:1)滴定至pH为9,陈化6h,反复过滤清洗至上层清液呈中性,沉淀物烘干,取20g沉淀物,加入8g NaCl,研磨成粉末,在热处理炉中进行煅烧合成,温度为1150℃,保温时间为3h,所得产物用去离子清洗去除盐,烘干即得纯净的W型铁氧体,并呈现规整的六角片状微观形貌,平均粒径为5微米左右。
实施例2:
将4.89g BaCl2·2H2O、5.45g ZnCl2、86.49g FeCl3·6H2O、120.08g尿素加入1000mL的蒸馏水配制成均匀混合溶液,将400mL混合溶液转移至容量为500mL水热反应釜反应釜中,水热反应温度180℃,保温10h。水热协助均匀共沉淀后溶液用碱溶液(摩尔比NaOH:Na2CO3=5:1)滴定至pH为10,陈化8h,反复过滤清洗至上层清液呈中性,沉淀物烘干。取20g沉淀物,加入6g NaCl和6g KCl,研磨成粉末,在热处理炉中进行煅烧合成,温度为1200℃,保温时间为2h,所得产物用去离子清洗去除盐,烘干即得。制备出的铁氧体磁粉的X射线衍射图谱(XRD)如图1所示,从图中可以看出制备出的样品没有出现杂相,表明制备出的样品为纯净的W型铁氧体。所制备出的铁氧体磁粉的扫描电镜图(SEM)如图2所示,从图2可以看出制备出的铁氧体呈现规整的六角片状微观形貌,平均粒径为5微米左右。
实施例3:
将4.89g BaCl2·2H2O、5.45g ZnCl2、86.49g FeCl3·6H2O、180.12g尿素加入1000mL的蒸馏水配制成均匀混合溶液,将400mL混合溶液转移至容量为500mL水热反应釜反应釜中,水热反应温度200℃,保温8h。水热协助均匀共沉淀后溶液用碱溶液(摩尔比NaOH:Na2CO3=4:1)滴定至pH为10.5,陈化10h,反复过滤清洗至上层清液呈中性,沉淀物烘干,取20g沉淀物,加入8g Na2SO4、4g K2SO4和4g KCl,研磨成粉末,在热处理炉中进行煅烧合成,温度为1250℃,保温时间为1h,所得产物用去离子清洗去除盐,烘干即得纯净的W型铁氧体,并呈现规整的六角片状微观形貌,平均粒径为5微米左右。
实施例4:
将4.89g BaCl2·2H2O、5.45g ZnCl2、86.49g FeCl3·6H2O、240.16g尿素加入1000mL的蒸馏水配制成均匀混合溶液,将400mL混合溶液转移至容量为500mL水热反应釜反应釜中,水热反应温度210℃,保温6h。水热协助均匀共沉淀后溶液用碱溶液(摩尔比NaOH:Na2CO3=3:1)滴定至pH为10.5,陈化12h,反复过滤清洗至上层清液呈中性,沉淀物烘干,取20g沉淀物,加入8g Na2SO4和12g K2SO4,研磨成粉末,在热处理炉中进行煅烧合成,温度为1300℃,保温时间为1h,所得产物用去离子清洗去除盐,烘干即得纯净的W型铁氧体,并呈现规整的六角片状微观形貌,平均粒径为5微米左右。

Claims (6)

1.一种易分散六角片状W型铁氧体BaZn2Fe16O27的制备方法,其具体步骤为:按BaZn2Fe16O27的化学计量比称取BaCl2·2H2O、ZnCl2、FeCl3·6H2O和尿素配制原始混合溶液进行水热协助均匀共沉淀,然后滴加碱性溶液调节pH值至9~11,陈化,反复过滤清洗至上层清液呈中性,沉淀物烘干,并在沉淀物中加入盐,研磨成粉末,在热处理炉中进行煅烧合成,所得产物用去离子水清洗,烘干即得易分散六角片状W型铁氧体BaZn2Fe16O27;其中碱性溶液为NaOH、Na2CO3的混合溶液,盐为NaCl、Na2SO4、KCl或K2SO4中的任意一种或几种的混合物;沉淀物与盐的质量比为1:(0.4~1);水热法协助共沉淀的反应温度为160℃~210℃,反应时间为4h~12h;热处理炉中反应温度为1150℃~1300℃,反应时间为1h~3h。
2.根据权利要求1所述的制备方法,其特征在于原始混合溶液中BaCl2与尿素的摩尔比为1:(50~200)。
3.根据权利要求1所述的制备方法,其特征在于所述原始溶液中BaCl2与尿素的摩尔比为1:(70~150)。
4.根据权利要求1所述的制备方法,其特征在于陈化时间为6~12h。
5.根据权利要求1所述的制备方法,其特征在于所述碱性溶液为NaOH和Na2CO3的混合溶液;其中NaOH和Na2CO3摩尔比为3~8:1。
6.根据权利要求1所述的制备方法,其特征在于热处理炉中反应温度为1150℃~1250℃。
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