CN1139813A - 掺杂的钛酸锶电流变液及其制备方法 - Google Patents
掺杂的钛酸锶电流变液及其制备方法 Download PDFInfo
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Abstract
本发明涉及一种电介质材料的制造技术,特别是涉及利用胶体化学方法来制备掺杂的钛酸锶电流变液技术。本发明的目的为了提供一种结构稳定,不易沉降,机械性能好的掺杂钛酸锶电流变液。本发明用SrCl2、TiCl4和MCl3乙二酸盐(或草酸)、柠檬酸、乙二酸醇脂作原料,按Sr1-xMxTiO3配制成陈化液,经陈化、离心、洗涤、烧结制成掺杂钛酸锶球形颗粒,再将它与200#硅油按不同体积分比混和,搅拌均匀制成掺杂钛酸锶电流变液。
Description
本发明涉及一种电介质材料的制造技术领域,特别是涉及利用胶体化学方法来制备掺杂的钛酸锶电流变液技术。
电流变液是目前很受重视的智能液体,在外加电场时,这种液体的粘滞性(剪切强度)立即(毫秒)增大4-5个数量级而变成类似固体。一旦撤去外电场,材料又恢复原来的液体状态,其剪切强度近似与外加电场强度的平方成正比,从而通过调节外加电压可连续改变剪切强度。这种新奇特性在技术上有重要的应用前景。其主要优点是响应时间快、连续可调、能耗低、便于计算机控制。可实现机电一体化的控制、传动、阻尼。例如可作减震器、离合器、无机调速、刹车、阀门等。在自动化、机器人汽车、航空等工业部门应用,将会产生革命性的影响。
电流变液这种效应在五十多年前就已发现,由于当时系采用含水的材料,例如玉米粉等,在较高温度时,水分易挥发,因此实际应用受到限制。如:专利文献2,417850 3/1947Winslow 175#320 US.3,047,567 7/1947 Winslow 252#75US.等。1987年以后发展了不含水的电流变液材料,如采用SiO2浮石等,可以在很宽的温度范围使用,但这些材料在低电压下,其剪切力很低,且比重大,易沉淀,仍难以广泛应用,如:专利文献4687,589 8/1987 Block 169#04US,1,501,635 2/1978 UK,2,153372 8/1985UK。
由于技术的发展和需求,促进了电流变液的研究,近年来美、英、日、俄等国均投入了很大力量开展电流变液材料和应用技术研究。又如“Nature”(1992)“Science”(1992)“Scientific American”(1993)等都作了专题报告和评述,日本石油公司在1994年新材料展示会上推出的电流变液剪切力为2Kpa的材料(具体材料未有公开)。我们国家在八十年代后期有少数单位开始进行硅铝酸盐、聚丙烯睛基、聚异丁烯酸等电流变液材料和应用方面的研究。总之,综合上述目前世界上还找不到一种在低电压下,剪切强度高达5Kpa的化学结构稳定、比重小、不易沉降的无机盐电流变液材料。
本发明的目的在于克服上述已有技术的缺点和不足,为了提供一种结构稳定,不易沉降,机械性能好,它能在外加电压达2500V/mm时,其剪切强度达5.5Kpa的掺杂钛酸锶电流变液;其次为了提供一种采用胶体化学方法来达到简化制备手续,提高成品率的制备球形掺杂钛酸锶电流变液的方法。
本发明的目的是这样实现的:采用化学纯以上等级的原料,用SrCl2、TiCl4做为阳离子基团和MCl3;(其中M可以是La、Y、Nd、Ce等轻稀土元素)作为掺杂剂;乙二酸盐如:乙二酸钾、钠盐或草酸做为阴离子基团;还可以加入适量柠檬酸做为掩蔽剂,调节陈化溶液的PH值在2-5之间;也可再加入适量乙二酸醇脂做为溶剂起到溶胶作用,按Sr1-xMxTiO3组成(其中X=0-0.4)来配比称料,取SrCl2按Sr2+0.05-0.4mol/l,TiCl4按Ti4+0.05-0.4mol/l;乙二酸为0.1-0.8mol/l;M的量由Sr1-xMxTiO3中X的含量确定MCl3的重量,搅拌混合均匀,此为陈化液,再将此陈化液置于50℃-70℃恒温水浴内陈化10-50分钟,然后用水冷,离心,经离心后所得沉淀物再用二次蒸馏水洗涤三次,一般的真空干燥,后放入马弗炉中在950℃烧结5-10小时,可得到白色掺杂的钛酸锶颗粒;把它与硅油等按不同体积分比混和均匀,SrTiO3+硅油按体积分比,即按: 式中Vp=颗粒总体积
Vf=油的体积即配成掺杂的钛酸锶电流变液。
下面结合附图及实施例对本发明做详细地说明:
图1:SiTiO3单晶球形颗粒的透射电镜照片。
图2:SiTiO3电流变液剪切强度对外加电场的变化曲线。
图3:Sr1-xMxTiO3球形链状的透射电镜照片。
图4:Sr1-xMxTiO3系列的剪切强度对外加电场的变化曲线。
实施例1:
将120ml浓度为1mol/l的乙二酸(或草酸)溶液加入含有50ml浓度为1mol/l SrCl2及50ml浓度为1mol/lTiCl4,柠檬酸10g,乙酸二醇脂10ml水溶液中,加水770ml,使混和后体系的组成为:0.05mol/lSr2+、0.05mol/lTi4+、0.12mol/l乙二酸(或草酸),将此陈化液置于65℃恒温水浴陈化50分钟,水冷、离心。所得沉淀物用二次蒸馏水洗涤三次,真空干燥,然后在950℃烧结7小时,即得钛酸锶,与200#硅油按体积分比0.41混匀成电流变液,其剪切强度与外加电场的关系如图2所示。
实施例2:
将240ml浓度为1mol/l的乙二酸(或草酸)溶液加入含有100ml浓度为1mol/l SrCl2及100ml浓度为1mol/lTiCl4,20ml浓度为1mol/l YCl3,柠檬酸20g,乙二酸醇脂10ml水溶液中,加水510ml,使混和后体系的组成为:0.1mol/l Sr2+、0.1mol/l Ti4+、0.24mol/l乙二酸、0.02mol/l Y3+,将此陈化液置于65℃恒温水浴中陈化30分钟,水冷、离心。所得沉淀物用二次蒸馏水洗涤三次,真空干燥,然后在马弗炉中950℃烧结7小时,即得原始配比为:Sr0.8Y0.2TiO3的白色颗粒,再将Sr0.8Y0.2TiO318.89与200#硅油6毫升按体积分比为0.38配制成电流变液,其性能参见图3、图4。
实施例3:取实施例2制备出的Sr0.8Y0.2TiO3的白色颗粒与200#硅油混和,按体积分比为0.33,称取Sr0.8Y0.2TiO3料15.1g同200#硅油6ml混和搅拌均匀为0.33的掺杂钛酸锶电流变液。
实施例4:取实施例2制备出的Sr0.8Y0.2TiO3的白色颗粒与200#硅油混和,按体积分比为0.29混合,可配成0.29系列的掺杂钛酸锶电流变液。
实施例5:同实施例2工艺所述,按照Sr1-xMxTiO3组成选取M为Ce(No3),制备原始组成为Sr0.8Ce0.2TiO3的掺铈钛酸铈,取Sr0.8Ce0.2TiO3白色颗粒粉末13.1g,200#硅油6毫升,按体积分比为0.23,混和搅拌均匀即可做成掺铈钛酸锶电流变液。所测的该电流变液剪切强度(在外加电场为2500V/mm时)为2000Pa。
实施例6:同实施例2所述的工艺相同来制备掺钕钛酸锶电流变液,用Nd2O3原料配制成Sr0.9Nd0.1TiO3,然后用掺钕钛酸锶与200#硅油混和,按体积分比为0.38混和,搅拌均匀做成掺钕的电流变液。
本发明的优点在于:
1.在低电压2500v/mm,剪切强度高达5.5Kpa。
2.不易沉降。
3.化学结构稳定。
4.材料颗粒形状一致,尺寸大小分布窄的单晶球形均匀分散
体系,单晶颗粒达0.5μ。
5.制备方法简单,成品率高。
Claims (6)
1.一种掺杂的钛酸锶电流变液,其特征在于:包括Sr1-xMxTiO3,其中M=La、Y、Nd、Ce;X=0-0.4等轻稀土元素,与200#硅油,两者按体积分比从0.23-0.65组成。
2.一种制备权利要求1所述的掺杂钛酸锶电流变液的方法,其特征在于:采用SrCl2、TiCl4、MCl3乙二酸盐(或草酸)做原料,按Sr1-xMxTiO3比例称料,其中M=La、Y、Nd、Ce,混合搅拌均匀配成陈化液,将陈化液置于50℃-70℃恒温水浴内陈化10-50分钟,然后用水冷,离心,经离心后所得沉淀物再用二次蒸馏水洗涤三次,经真空干燥后,放入马弗炉中在950℃烧结5-10小时,可得到白色球形颗粒掺杂的钛酸锶颗粒与200#硅油按体积分比均匀混和,制成掺杂钛酸锶电流变液。
3.按权利要求2所述的掺杂钛酸锶电流变液的方法,其特征在于:所述的原料MCl3M=La、Y、Nd、Ce的氯化物。
4.按权利要求2所述的制备掺杂钛酸锶电流变液的方法,其特征在于:所述的乙二酸盐原料为乙二酸钾、乙二酸钠。
5.按权利要求2、3、4所述的制备掺杂钛酸锶电流变液的方法,其特征在于:掺杂钛酸锶与200#硅油的混和比例,按体积分比0.23-0.65混和。
6.按权利要求2所述的制备掺杂钛酸锶电流变液的方法,其特征在于:还包括在SrCl2、TiCl4、MCl3、乙二酸盐配好的陈化液内加入柠檬酸PH调节到2-5之间。
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000064814A1 (en) * | 1999-04-27 | 2000-11-02 | Mcmaster University | Mixed electronic and ionic conducting ceramics |
WO2003094268A3 (en) * | 2002-05-03 | 2004-06-03 | Battelle Memorial Institute | Cerium-modified doped strontium titanate composition for solid oxide fuel cell anodes and electrodes for other electrochemical devices |
CN100360650C (zh) * | 2004-12-29 | 2008-01-09 | 西北工业大学 | 一种纳米钛酸盐电流变液 |
CN111968794A (zh) * | 2020-08-17 | 2020-11-20 | 王成艳 | 一种线缆绝缘层包覆方法 |
CN113845964A (zh) * | 2021-08-04 | 2021-12-28 | 杭州赛聚科技有限公司 | 一种电流变液的制备方法 |
Family Cites Families (2)
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US4687589A (en) * | 1985-02-06 | 1987-08-18 | Hermann Block | Electronheological fluids |
US4772407A (en) * | 1987-12-02 | 1988-09-20 | Lord Corporation | Electrorheological fluids |
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1995
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000064814A1 (en) * | 1999-04-27 | 2000-11-02 | Mcmaster University | Mixed electronic and ionic conducting ceramics |
WO2003094268A3 (en) * | 2002-05-03 | 2004-06-03 | Battelle Memorial Institute | Cerium-modified doped strontium titanate composition for solid oxide fuel cell anodes and electrodes for other electrochemical devices |
US7670711B2 (en) | 2002-05-03 | 2010-03-02 | Battelle Memorial Institute | Cerium-modified doped strontium titanate compositions for solid oxide fuel cell anodes and electrodes for other electrochemical devices |
CN100360650C (zh) * | 2004-12-29 | 2008-01-09 | 西北工业大学 | 一种纳米钛酸盐电流变液 |
CN111968794A (zh) * | 2020-08-17 | 2020-11-20 | 王成艳 | 一种线缆绝缘层包覆方法 |
CN113845964A (zh) * | 2021-08-04 | 2021-12-28 | 杭州赛聚科技有限公司 | 一种电流变液的制备方法 |
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