Ying LI
材料科学技术（英文）
Oxide materials NaCo2O4 and (Na1-yMy)1.6Co2O4 (M=K, 0.05≤y≤0.35; M=Ca, Sr, 0.10≤y≤0.40) were prepared by a sol-gel method. Experimental results indicated that the Seebeck coefficient and the Power-factor of Na Co2O4 were improved by doping Ca and Sr but not by K. The Power-factor of NaCo2O4 is in its maximum, 1.68×10-4 W•m-1•K-2 and 11% bigger than that of the original one when the dopant fraction of Ca was 0.1. Doping Sr makes NaCo2O4 have the biggest Power-factor, 1.68×10-4 W•m-1•K-2 that is 50% bigger than the non-doping oxide. The experimental results indicate that suitable dopants and addition amounts could improve the thermoelectric properties of NaCo2O4 greatly.
关键词:
Thermoelectric materials
,
materials
,
Electric
,
proper
王丹
,
高延敏
功能材料
doi:10.3969/j.issn.1001-9731.2015.05.006
Si O 2微球是齿科树脂的重要填充物,为进一步研究其对齿科树脂性能的影响,采用溶胶-凝胶法制备纳米Si O 2微球,并将其改性后应用于齿科树脂中,通过 FT-IR、SEM、TEM、激光粒度分析仪、微机控制万能拉伸试验机、DMA 等对制备的 Si O 2及其齿科复合材料进行表征分析.结果表明,γ-甲基丙烯酰氧基丙基三甲氧基硅烷成功改性SiO2,得到的SiO2微球分散性较好,呈规则的球形,平均粒径为450 nm；复合材料的强度与填充量有关,随着 Si O 2含量的增多力学性能增大,当填充量为45％时,复合材料的力学性能最大,弯曲强度为123．682 MPa,压缩强度为208．802 MPa,E′和 tanδ均达到最大值,并分析了力学性能存在差异的原因.
关键词:
溶胶-凝胶法
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SiO2微球
,
齿科复合材料
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性能
