CN107488028B - 一种铑基氧化物热电材料及其制备方法 - Google Patents

一种铑基氧化物热电材料及其制备方法 Download PDF

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CN107488028B
CN107488028B CN201710572784.9A CN201710572784A CN107488028B CN 107488028 B CN107488028 B CN 107488028B CN 201710572784 A CN201710572784 A CN 201710572784A CN 107488028 B CN107488028 B CN 107488028B
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于杰
战祥浩
张昆华
周晓龙
戴炳蔚
胡明钰
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Kunming University of Science and Technology
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Abstract

本发明涉及一种铑基氧化物热电材料及其制备方法,属于新能源材料及其制备技术领域。本发明铑基氧化物热电材料的化学通式为ABxRh2‑2xO4;其中x=0.1~0.5,A为元素Cu、Li、Bi、Ca、Zn、Sr、Na或La,B为元素Fe、Co、Ni、Mn、Cr、Mg。该铑基氧化物热电材料粉体混合、预烧结、放电等离子体烧结等步骤制备而成。本发明所述的铑基氧化物热电材料具有耐高温、耐腐蚀、耐氧化性高等特点,可应用在废热发电、空调系统、冷热两用箱、干洗机、医疗保健、生物工程、通讯、航空航天领域等领域。

Description

一种铑基氧化物热电材料及其制备方法
技术领域
本发明涉及一种铑基氧化物热电材料及其制备方法,属于新能源材料及其制备技术领域。
背景技术
近年来,人口飞速增长及工业迅猛发展,化石燃料过度开采,能源和环境问题越发凸显,能源危机和环境危机已引起各国关注。然而,全球每年消耗的能源中约有70%以废热的形式被浪费掉,如果能将这些废热进行有效的回收利用,将极大的缓解能源短缺的问题。热电材料能直接将热能转换成电能,具有无传动部件、体积小、无噪音、无污染及可靠性好等优点,在汽车废热回收利用,工业余热发电方面有着巨大的应用前景。
热电材料的转换效率由无量纲热电优值ZT(ZT=s2σT/κ,其中s为Seebeck系数、σ为电导率、κ为导热系数、T为绝对温度,s2σ称为功率因子) 决定。ZT越大,材料的热电转换效率越高。由上述方程式所显见;为了改善热电转换材料的性能,需要提高塞贝克系数s和电导率或需要降低导热系数κ。
Martinez H等通过固相反应法,用Mg对CuRhO2的Rh位掺杂,得到一种在1000 K温度下ZT为0.15的热电结构的CuMgxRh1-xO2热电材料,在x=0.05附近,室温下显示出金属-绝缘体的转变,x=0.2时,样品显示低电阻率(4mΩ•cm),高赛贝克系数(130μV/K),功率因子为4225μW/cm.K2,是一种很好的热电材料。
目前对铑基氧化物热电材料研究较少,尚未有简单易行的制备铑基氧化物热电材料的方法。
发明内容
本发明的目的是公开一种铑基氧化物热电材料,其化学通式为ABxRh2-2xO4;其中x=0.1~0.5,A为元素Cu、Li、Bi、Ca、Zn、Sr、Na或La,B为元素Fe、Co、Ni、Mn、Cr、或Mg。
进一步地,A金属元素与铑金属元素的摩尔比为1:(0.5~1),铑金属元素与B金属元素的摩尔比为1:(0.05~0.5)。
本发明的另一目的是提供该铑基氧化物热电材料的制备方法,具体步骤如下:
(1)将氧化铑、A金属的氧化物和B金属的氧化物混合均匀、过筛得到混合粉体A;
(2)将步骤(1)所得混合粉体A进行预烧结、磨碎、过筛得到混合粉体B;
(3)在真空条件下,将步骤(2)所得混合粉体B进行放电等离子体烧结即得铑基氧化物热电材料;
所述过筛的筛网为200~300目筛网;
所述步骤(1)中A金属的氧化物与铑金属的氧化物摩尔比为1:(0.5~1),A金属的氧化物为CuO、Cu2O、Li2O、Bi2O3、CaO、ZnO、SrO、Na2O或La2O3;铑金属的氧化物与B金属的氧化物的摩尔比为1:(0.1~1),B金属的氧化物为Fe2O3、Co2O3、Ni2O3、MnO2、Cr2O3、或MgO;
所述步骤(2)中预烧结的温度为800~1000℃,时间为24~48h;
进一步地,所述步骤(2)中磨碎为球磨,磨球直径为10~20mm,球磨介质为无水乙醇,球磨球、原料和无水乙醇的质量比为6~8:1:1.5~2;球磨机转速为300~500r/min,球磨时间为6~12h;
所述步骤(3)中放电等离子体烧结温度为700~1100℃,时间为10~30min,压力为15-30kN;
进一步地,所述步骤(3)中真空条件的真空度为5x10-3~1x10-2Pa。
本发明的有益效果是:
(1)本发明所述铑基氧化物热电材料具有耐高温、耐腐蚀、耐氧化性高等特点;
(2)本发明方法可制备出质量好的铑基氧化物热电材料;
(3)本发明方法具有工艺流程简单、效率高、生产成本低、对环境无污染的特点。
附图说明
图1为铜铑基氧化物热电材料的结构示意图;
图2为实施例1铑基氧化物热电材料CuMg0.1Rh1.8O4的XRD图;
图3为实施例1~5的铑基氧化物热电材料的ZT值。
具体实施方式
下面结合具体实施方式对本发明作进一步详细说明,但本发明的保护范围并不限于所述内容。
实施例1:一种铑基氧化物热电材料CuMg0.1Rh1.8O4的制备方法,具体步骤如下:
(1)称取0.8g氧化铜(CuO)、0.04g氧化镁(MgO)、2.54g氧化铑(Rh2O3),即A金属的氧化物(氧化铜)与氧化铑的摩尔比为1:1,氧化铑与B金属的氧化物(氧化镁)的摩尔比为1:0.1;然后将粉体置于玛瑙球磨罐中,按照球磨球、原料和无水乙醇的质量比为6:1:1.5的比例,加入玛瑙磨球和无水乙醇,在转速300r/min磨球机上进行球磨12h将其粉体混合均匀,过200目筛网得到混合粉体A;
(2)将步骤(1)所得混合粉体A置于箱式电阻炉中,设定升温速率为5℃/min,加热至温度为940℃,并进行恒温预烧结36h,随炉冷却至室温,将预烧结产物置于玛瑙球磨罐中,按照球磨球、原料和无水乙醇的质量比为6:1:1.5的比例,加入玛瑙球磨球和无水乙醇,在磨球机上,转速300r/min进行球磨6h将其粉体混合均匀,在过200目筛网得到混合粉体B;
(3)将步骤(2)所得混合粉体B置于石墨模具中,然后再置于放电等离子(SPS)烧结炉中,抽真空至真空度为5x10-3pa,设定升温速率为60℃/min,加热至温度为720℃,压力为15kN,恒温烧结10min,随炉冷却至室温即得铑基氧化物热电材料CuMg0.1Rh1.8O4
本实施例铜铑基氧化物热电材料的结构示意图如图1所示,从图1可知,铜铑基氧化物热电材料由Cu2+和RhO单元沿c轴交替叠加组成,具有热电材料层状分布的结构特点;
本实施例铑基氧化物热电材料CuMg0.1Rh1.8O4的XRD图如图2所示,从图2可知, Mg的掺杂量摩尔比为0.1时,与标准CuRh2O4的标准PDF卡片衍射峰位置相吻合,并无明显杂相峰,说明通过SPS烧结工艺,掺杂效果较好,已完成单一物相的制备;
本实施例铑基氧化物热电材料CuMg0.1Rh1.8O4的ZT值如图3所示,从图3可知,CuMg0.1Rh1.8O4的ZT值随着温度的上升而增大,在温度900℃时可达到0.31。
实施例2:一种铑基氧化物热电材料CaMn0.2Rh1.6O4的制备方法,具体步骤如下:
(1)称取0.56g氧化钙(CaO)、0.087g二氧化锰(MnO2)、2.413g氧化铑(Rh2O3),即A金属的氧化物(氧化钙)与氧化铑的摩尔比为1:0.8,B金属的氧化物(二氧化锰)与氧化铑的摩尔比为1: 0.125;然后将粉体置于玛瑙球磨罐中,按照球磨球、原料和无水乙醇的质量比为6:1:1.5的比例,加入玛瑙球磨球和无水乙醇,在转速400r/min磨球机上进行球磨12h将其粉体混合均匀,过200目筛网得到混合粉体A;
(2)将步骤(1)所得混合粉体A置于箱式电阻炉中,设定升温速率为5℃/min,加热至温度为930℃,并进行恒温预烧结48h,随炉冷却至室温,将预烧结产物置于玛瑙球磨罐中,按照球磨球、原料和无水乙醇的质量比为6:1:1.5的比例,加入玛瑙球磨球和无水乙醇,在磨球机上,转速300r/min进行球磨12h将其粉体混合均匀,过200目筛网得到混合粉体B;
(3)将步骤(2)所得混合粉体B置于石墨模具中,然后再置于放电等离子(SPS)烧结炉中,抽真空至真空度为6x10-3pa,设定升温速率为50℃/min,加热至温度为850℃,压力为20kN,恒温烧结30min,随炉冷却至室温即得铑基氧化物热电材料CaMn0.2Rh1.6O4
本实施例铑基氧化物热电材料CaMn0.2Rh1.6O4的ZT值如图3所示,从图3可知,CaMn0.2Rh1.6O4的ZT值也是随着温度的上升而增大,在温度900℃时达到0.40。
实施例3:一种铑基氧化物热电材料ZnCo0.2Rh1.6O4的制备方法,具体步骤如下:
(1)称取0.83g氧化锌(ZnO)、0.164g氧化钴(Co2O3)、2.413g氧化铑(Rh2O3),即A金属的氧化物(氧化锌)与氧化铑的摩尔比为1:0.8,B金属的氧化物(氧化钴)与氧化铑的摩尔比为1:0.125;然后将粉体置于玛瑙球磨罐中,按照球磨球、原料和无水乙醇的质量比为6:1:1.5的比例,加入玛瑙球磨球和无水乙醇,在转速300r/min磨球机上进行球磨10h将其粉体混合均匀,过200目筛网得到混合粉体A;
(2)将步骤(1)所得混合粉体A置于箱式电阻炉中,设定升温速率为5℃/min,加热至温度为900℃,并进行恒温预烧结36h,随炉冷却至室温,将预烧结产物置于玛瑙球磨罐中,按照球磨球、原料和无水乙醇的质量比为6:1:1.5的比例,加入玛瑙球磨球和无水乙醇,在磨球机上,转速300r/min进行球磨12h将其粉体混合均匀,过300目筛网得到混合粉体B;
(3)将步骤(2)所得混合粉体B置于石墨模具中,然后再置于放电等离子(SPS)烧结炉中,抽真空至真空度为1x10-2pa,设定升温速率为100℃/min,加热至温度为1000℃,压力为25kN,恒温烧结20min,随炉冷却至室温即得铑基氧化物热电材料ZnCo0.3Rh1.4O4
本实施例铑基氧化物热电材料ZnCo0.2Rh1.6O4的ZT值如图3所示,从图3可知,ZnCo0.2Rh1.6O4的ZT值随着温度的上升而增大,在温度900℃时达到0.43。
实施例4:一种铑基氧化物热电材料CuCr0.4Rh1.2O4的制备方法,具体步骤如下:
(1)称取1.44g氧化亚铜(Cu2O)、0.152g氧化铬(Cr2O3)、2.413g氧化铑(Rh2O3),即A金属的氧化物(氧化亚铜)与氧化铑的摩尔比为1:0.6,B金属的氧化物(氧化铬)与氧化铑的摩尔比为1:0.35;然后将粉体置于玛瑙球磨罐中,按照球磨球、原料和无水乙醇的质量比为6:1:1.5的比例,加入玛瑙球磨球和无水乙醇,在转速300r/min磨球机上进行球磨12h将其粉体混合均匀,过200目筛网得到混合粉体A;
(2)将步骤(1)所得混合粉体A置于箱式电阻炉中,设定升温速率为5℃/min,加热至温度为850℃,并进行恒温预烧结48h,随炉冷却至室温,将预烧结产物置于玛瑙球磨罐中,按照球磨球、原料和无水乙醇的质量比为6:1:1.5的比例,加入玛瑙球磨球和无水乙醇,在磨球机上,转速300r/min进行球磨12h将其粉体混合均匀,过250目筛网得到混合粉体B;
(3)将步骤(2)所得混合粉体B置于石墨模具中,然后再置于放电等离子(SPS)烧结炉中,抽真空至真空度为5x10-3pa,设定升温速率为50℃/min,加热至温度为950℃,压力为20kN,恒温烧结30min,随炉冷却至室温即得铑基氧化物热电材料CuCr0.4Rh1.2O4
本实施例铑基氧化物热电材料CuCr0.4Rh1.2O4的ZT值图如图3所示,从图3可知,CuCr0.4Rh1.2O4的ZT值随着温度的上升而增大,在温度900℃时达到0.55。
实施例5:一种铑基氧化物热电材料SrNi0.5RhO4的制备方法,具体步骤如下:
(1)称取1.04g氧化锶(SrO)、0.164g氧化镍(Ni2O3)、2.413g氧化铑(Rh2O3),即A金属的氧化物(氧化锶)与氧化铑的摩尔比为1:0.5,B金属的氧化物(氧化镍)与氧化铑的摩尔比为1:1;然后将粉体置于玛瑙球磨罐中,按照球磨球、原料和无水乙醇的质量比为6:1:1.5的比例,加入玛瑙球磨球和无水乙醇,在磨球机上,转速500r/min进行球磨12h将其粉体混合均匀,过200目筛网得到混合粉体A;
(2)将步骤(1)所得混合粉体A置于箱式电阻炉中,设定升温速率为5℃/min,加热至温度为800℃,并进行恒温预烧结36h,随炉冷却至室温,将预烧结产物置于玛瑙球磨罐中,按照球磨球、原料和无水乙醇的质量比为6:1:1.5的比例,加入玛瑙球磨球和无水乙醇,在磨球机上,转速300r/min进行球磨12h将其粉体混合均匀,过200目筛网得到混合粉体B;
(3)将步骤(2)所得混合粉体B置于石墨模具中,然后再置于放电等离子(SPS)烧结炉中,抽真空至真空度为8x10-3pa,设定升温速率为100℃/min,加热至温度为900℃,压力为30kN,恒温烧结20min,随炉冷却至室温即得铑基氧化物热电材料SrNi0.5RhO4
本实施例铑基氧化物热电材料SrNi0.5RhO4的ZT值如图3所示,从图3可知,SrNi0.5RhO4的ZT值随着温度的上升而增大,在温度900℃时达到0.46。

Claims (5)

1.一种铑基氧化物热电材料,其特征在于,其化学通式为ABxRh2-2xO4;其中x=0.1~0.5,A为元素Cu、Li、Bi、Ca、Zn、Sr、Na或La,B为元素Fe、Co、Ni、Mn、Cr、或Mg,A金属元素与铑金属元素的摩尔比为1:(0.5~1),铑金属元素与B金属元素的摩尔比为1:(0.05~0.5)。
2.如权利要求1所述的铑基氧化物热电材料的制备方法,其特征在于,具体步骤如下:
(1)将氧化铑、A金属的氧化物和B金属的氧化物混合均匀、过筛得到混合粉体A;
(2)将步骤(1)所得混合粉体A进行预烧结、磨碎、过筛得到混合粉体B;
(3)在真空条件下,将步骤(2)所得混合粉体B进行放电等离子体烧结即得铑基氧化物热电材料。
3.根据权利要求2所述的铑基氧化物热电材料的制备方法,其特征在于:步骤(1)中A金属的氧化物与铑金属的氧化物的摩尔比为1:(0.5~1),A金属的氧化物为CuO、Cu2O、Li2O、Bi2O3、CaO、ZnO、SrO、Na2O或La2O3;铑金属的氧化物与B金属的氧化物的摩尔比为1:(0.1~1),B金属的氧化物为Fe2O3、Co2O3、Ni2O3、MnO2、Cr2O3、或MgO。
4.根据权利要求2或3所述的铑基氧化物热电材料的制备方法,其特征在于:步骤(2)中预烧结的温度为800~1000℃,时间为24~48h。
5.根据权利要求2所述的铑基氧化物热电材料的制备方法,其特征在于:步骤(3)中放电等离子体烧结温度为700~1100℃,时间为10~30min,压力为15~30kN。
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