SPS低温增压烧结对方钴矿热电性能的影响
首发时间:2014-05-30
摘要:烧结温度与烧结压力是方钴矿热电材料SPS烧结工艺的重要参数,通常SPS烧结方钴矿热电材料采用的压力为40-60MPa,温度为903-923K。本文尝试在更高压力条件下采用更低温度烧结方钴矿热电材料,研究在100MPa,200MPa压力下采低温烧结所得方钴矿热电材料的结构及性能变化。研究发现,在将烧结压力提高到100MPa时,烧结温度可从903K降低到853K,在烧结压力为200MPa时,烧结温度可降低至803K。烧结产物的致密度均在98%以上,XRD与SEM结果显示,所得块体材料均为单相的方钴矿材料,晶粒尺寸与正常烧结相比有所减小。热电性能测试结果显示,与常规烧结工艺相比,低温增压烧结所得样品的ZT值均有提高。100MPa,853K所得样品在473K其ZT值提升了34.17%,在573K时其ZT值达0.184。
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Lower temperature and higher pressure sintering of SPS to the effect of CoSb3's thermoelectric property
Abstract:Pressure and temperature were the important parameters about CoSb3's SPS sintering technics. Generally, the sintering pressure was between 40 to 60MPa, the sintering temperature was between 903 to 923K. In this article, SPS sintering technics of CoSb3 on lower sintering temperature and higher sintering pressure was investigated, the sintering pressure were 100MPa and 200MPa, and the sintering temperature was lower than common technics, then, studied the change of obtained sample's microstructure and thermoelectric property. The results showed that, when the sintering pressure was 100MPa, the sintering temperature could be decreased from 903K to 853K, when the sintering pressure was 100MPa, the sintering temperature could be decreased to 803K, the densities of obtained bulk samples were above 98%. XRD and SEM results showed that all the samples were single-phased CoSb3, grain size were smaller than common sintering technics. Compared with common technics, low temperature and higher pressure sintering of SPS could improve CoSb3's ZT merit. When used 100MPa, 853K sintering parameter, CoSb3's ZT merit improved 34.17% at 473K, ZT merit arrived 0.184 at 573K.
Keywords: Thermo-electric material CoSb3 SPS thermoelectric property
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No.4598569530973140****
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