碳纤维硫铝酸盐水泥基复合材料的机敏性能

Influence of Forming Pressure on Smart Properties of Carbon Fiber Reinforced Sulphoaluminate Cement Composites

采用压制成型方法，制备了碳纤维硫铝酸盐水泥基复合材料（carbon fiber reinforced sulphoaluminate cement composites，简称CFSC），研究了成型压力对CFSC压阻效应和温阻效应的影响．结果表明：成型压力为7，10MPa时，CFSC的压阻性能较好，压应力与CFSC的电阻率之间呈现一一对应关系；碳纤维掺量相同时，成型压力越大，CFSC的电阻率越小；测量频率越大，CFSC的电阻率越小，这与CFSC的极化有关；成型压力对CFSC的温度-电阻率曲线的变化规律没有影响；压制成型CFSC的温度-电导率曲线1（1/T-1nσ曲线）在-40～85℃内近似呈线性关系，可以应用此特性来测量周围的环境温度．

Carbon fiber reinforced sulphoaluminate cement composites（CFSC） was fabricated by press moulding; the influence of forming pressure on smart properties of CFSC was studied. The results indicate CFSC has good piezo-resistivity effect, the fractional change in resistivity of CFSC is corresponding to the load change when the CFSC is fabricated under the stress of 7,10 MPa; when the carbon fiber content is 0.5 %, with the forming pressure rising the resistivity value becomes smaller; when the measure frequency becomes higher, the resistivity measured decreases, and this is related to the polarization effect; the forming pressure is not related to the curve of temperature and the resistivity of CFSC; the natural logarithm of the CFSC conductance is linear with the reciprocal value of absolute temperature between minus 40 ℃ and 85 ℃, this characteristic could be used to measure surrounding temperature.