镀镍碳纤维水泥基材料的电热性能研究

Electrothermal Performance of Nickel-Plated Carbon Fiber Cement-Based Materials

采用镀镍碳纤维(Ni-CF)制备导热水泥基复合材料,研究水灰比、纤维掺量和长度对水泥净浆试件升温值的影响,分析了Ni-CF掺量对水泥净浆试件电热升温和电热转化率的提升效果。结果表明:随着Ni-CF掺量的增加,试件的最大升温值呈先升高后降低的趋势,纤维掺量为0.4%(质量分数)时试件升温效果的提升最明显;当Ni-CF长度从4 mm增至8 mm时,水泥净浆试件的最大升温值逐渐降低;水灰比(W/C)为0.5时,Ni-CF水泥净浆试件通电发热的温度最高;Ni-CF提高水泥净浆试件电热转化率的效果较好,最高可达71.98%,是同配合比下碳纤维(CF)水泥净浆试件电热转化率的两倍。

To investigate the electrothermal properties of nickel-plated carbon fiber(Ni-CF) cement-based materials,the Ni-CF was mixed into cement to prepare thermally conductive cement-based composites.The effects of water-cement ratio(W/C),fiber content and length on the heating law of cement paste specimens were studied,and the variation law of the maximum temperature rise and the difference of the electrothermal conversion rate were analyzed.The results show that when the content of nickel-plated carbon fiber increases from 0.3% to 0.6%,the maximum temperature rise of the specimens increase first and then decrease,among them,the sample with 0.4%(mass fraction) Ni-CF content has the best heating effect.With the increase of Ni-CF length from 4 mm to 8 mm,the maximum temperature rise of cement paste specimen decreases gradually.The increase of the water-cement ratio leads to the maximum temperature rise of the nickel-plated carbon fiber cement paste.Under the same intensity of the current,the electrothermal conversion rate of Ni-CF cement specimens reach 71.98%,which is twice as high as that of carbon fiber(CF) cement specimens under the same mix ratio.