本文選題：功能材料 + 電性能�。� 參考：《南京航空航天大學(xué)》2013年碩士論文

【摘要】：摻功能材料制備的水泥基材料在道路融冰化雪、建筑采暖和屏蔽以及機(jī)場跑道吸波等方面的應(yīng)用將會帶來巨大的社會和經(jīng)濟(jì)效益。本文研究了摻功能材料水泥基材料的電性能和磁性能，具體研究內(nèi)容和結(jié)論如下： 研究了各因素對摻功能材料水泥基材料導(dǎo)電性能的影響：水泥凈漿的電阻率會隨功能材料C摻量和長度的增加而降低，功能材料C的滲流閾值約為1%；功能材料B在0.25%摻量時凈漿電阻率下降明顯，繼續(xù)增加摻量在小于4%時電阻率降低幅度較小；納米材料F具有較高的磁導(dǎo)率，會降低凈漿的電阻率；納米材料N和C分別具有空穴導(dǎo)電特性和氣敏性，能夠降低凈漿的電阻率；納米材料T摻入凈漿中對水泥凈漿電阻率降低幅度較小。按體積比例在砂漿中摻入功能材料C，砂漿的電阻率會隨砂膠比增加而增大，隨水灰比的增加而降低。 通過正交實(shí)驗(yàn)研究了水灰比、功能材料C和B的摻量對混凝土導(dǎo)電性能、力學(xué)性能的影響，最后確定混凝土最優(yōu)組分為：水灰比0.44，功能材料C19.09g，功能材料B38.16g。測試了長期通電條件下混凝土溫度和電阻率的變化，混凝土的溫度會隨著通電時間的增加而呈現(xiàn)先上升后下降的趨勢，，電阻率則單調(diào)增加。 研究了摻功能材料水泥基吸波材料的吸波性能與力學(xué)性能。雙層水泥基吸波板的反射率在2-18GHz頻率范圍內(nèi)均低于-5.4dB，小于-10dB的有效帶寬為3.7GHz；三層水泥基吸波板的反射率均低于-5.9dB，小于-10dB的有效帶寬為10.8GHz。分別測試了雙層吸波板和三層吸波板各層及整體的7d和28d抗壓強(qiáng)度。對雙層吸波材料的上層和下層進(jìn)行了SEM和EDS分析。 運(yùn)用有限元模擬了初始溫度及環(huán)境溫度為-15℃、輸入電壓50V、電阻率為455導(dǎo)電混凝土在底部絕熱條件下的融冰過程，在5270s時冰層完全融化；通過能量守恒計(jì)算融冰時間為5244s，實(shí)驗(yàn)測試融冰時間為6000s。
[Abstract]:The application of cement-based materials mixed with functional materials in road ice melting snow building heating and shielding and airport runway absorbing will bring great social and economic benefits. In this paper, the electrical and magnetic properties of cement-based materials doped with functional materials are studied. The specific contents and conclusions are as follows: The effects of various factors on the electrical conductivity of cement-based materials doped with functional materials are studied. The resistivity of cement paste decreases with the increase of C content and length of functional materials. The percolation threshold of functional material C is about 1: 1, the net slurry resistivity of functional material B decreases obviously when the content of material B is 0.25%, the decrease of resistivity decreases slightly when the content of functional material B is less than 4, and the permeability of nano-material F is higher. Nanomaterials N and C have hole conductivity and gas sensitivity respectively, which can reduce the resistivity of paste. The resistivity of mortar increases with the increase of the ratio of sand to cement and decreases with the increase of water / cement ratio when the functional material C is added into the mortar according to the volume ratio. The effects of water-cement ratio and the content of C and B on the conductivity and mechanical properties of concrete were studied by orthogonal experiment. The optimum composition of concrete was determined as follows: water-cement ratio 0.44, functional material C 19.09 g, functional material B38.16g. The change of temperature and resistivity of concrete under the condition of long term electrification is tested. The temperature of concrete will rise first and then decrease with the increase of electrification time, but the resistivity will increase monotonously. The absorbing and mechanical properties of cement based absorbing materials were studied. The reflectivity of the double-layer cement based absorbing plate is lower than -5.4 dB and the effective bandwidth less than -10 dB is 3.7 GHz in the 2-18GHz frequency range, and the reflectivity of the three-layer cement based absorbing plate is less than -5.9 dB, and the effective bandwidth less than -10 dB is 10.8 GHz. The compressive strength of the bilayer absorbing plate and the three-layer absorbing plate were measured for 7 days and 28 days, respectively. The upper and lower layers of bilayer absorbing materials were analyzed by SEM and EDS. The melting process of initial temperature and ambient temperature of -15 鈩

本文編號：1807120