纳米炭黑水泥砂浆的导电性与电热特性研究

Study on electrical and electrothermal properties of nano carbon black cement mortar

研究了纳米炭黑水泥砂浆的导电性和电热特性。研究表明,当炭黑掺量＜2．5%时,随着炭黑掺量的增加,电阻率下降明显；炭黑掺量为2．5%时,发黑水泥砂浆电阻率可达到102Ω·cm；而炭黑掺量＞2．5%时,电阻率下降趋缓。在炭黑掺量为5%左右电阻率基本不变,电阻率在30～40Ω·cm之间。与石墨粉相比,纳米炭黑做导电相只需较小掺量,就可制备满足电热功能应用的导电混凝土。当炭黑掺量＞1%时,龄期对电阻率影响小,其电阻比较稳定。炭黑水泥砂浆板电功率稳定、电热功能重复性好。

Research of the nano carbon black cement mortar electrical and electrothermal properties. Experiment show that when the content of carbon black less than 2.5% ,the higher quantity,the lower resistivity;when the content is 2.5%, the resistivity attain 102Ω·cm;and more than 2.5%, the resistivity decline trend to steady. As the content is about 5% ,the resistivity remain steadyness basically and round about 30-4012 Ω· cm. Compare to the graphite,as the conductive additive to get concrete which have electrothermal function applied, the carbon black need smaller. As the content more than 1%, the age have litter influence on the resistivity and it will be steady relative. The carbon black cement mortar also have steady electric power and good reiteration.