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ntc effect
    When EVA content less than 27. 4wt%, the room temperature resistivity of composite material is less than 2. 4 Ω·m, the PTC intensity is larger than 7. 1, the NTC effect is less than 0. 5;
    当EVA的质量含量<27.4%时,复合材料的室温电阻率<2.4Ω·m,PTC强度>7.1,NTC效应<0.5。
    The NTC Effect of PZT/Y_(0.9)Ca_(0.1)Ba_2Cu_4O_8 and Ag_2O-Doped Composites
    PZT/Y_(0.9)Ca_(0.1)Ba_2Cu_4O_8及Ag_2O掺杂的复合氧化物陶瓷的NTC效应
    ·cm, PTC intensity of 4.7 orders of magnitude, and middle NTC effect.
    ·cm,PTC强度为4.7个数量级,但出现中等程度NTC效应
    However, Cu-Ag composite with low room resistivity requires 15%wt higher content of filler than that of MCMB, and its PTC intensity do not tend to decrease with an increase in conductive filler content, but appears serious NTC effect.
    镀银铜粉复合材料低阻时所需的填充量比MCMB的高15%wt左右,PTC强度较高且不易随导电填料含量增加而下降,但NTC效应也较为严重。
    NTC effect of PVDF/CB compound can be weakened by γ60Co irradiation, but cannot be eliminated completely during irradiating below 40 Mrad.
    并用DSC测试结果解释了这一现象,40Mrad以下剂量γ-60Co辐照能削弱NTC效应,但不能完全消除。
    SiO_2 or ZrO_2-added samples have obvious NTC-PTC composite effects. Small addition of PbO helps to decrease ρ25 and the NTC effect.
    其中,SiO_2或 ZrO_2增强了居里点以下的 NTC 效应,降阻比可达 1个数量级;
    The NTC effect corresponded to thermal activation conduction mechanism, while the PTC effect was related to the breakdown of conductive network caused by volume expansion.
    c时,阻温关系只呈现NTC效应,NTC效应对应热活化导电机理,而PTC效应取决于体积膨胀所引起的导电网络局部破坏有关。
    In this paper, some factors influencing room temperature resistivity, PTC intensity and NTC effect were firstly studied, including carbon black content, properties of carbon black, dispersion of cabon black, mixing with other inorganic filler, chain structure of matrix, melt fluidity of matrix, crystallinity of matrix, etc.
    本文较系统地研究了影响聚乙烯/炭黑复合体系渗滤效应、PTC效应和NTC效应的因素,包括炭黑的含量、炭黑的性质、炭黑的分散、与一些无机填料的复合体系、基体的链结构、基体的熔融流动性、基体的结晶性等方面。
    Through gamma ray irradiation, the PTC intensity and the stability of PTC effect could be improved and the NTC effect is weakened.
    本文应用辐照交联的方法提高了聚乙烯/炭黑复合体系的PTC强度,抑制了NTC效应,改善PTC效应的稳定性。
    The effect of EVA with different VA content on HDPE/CB composite was also researched. The phase separation of HDPE and EVA, and thetendency for carbon black to concentrate in EVA phase make HDPE/EVA/CB composite have a lower percolation threshold, a higher PTC intensity and the NTC effect is avoided. Through irradiation of HDPE and ozonization of carbon black, the compatibility between HDPE and CB are improved.
    本文还深入研究了不同VA含量的EVA与聚乙烯/炭黑共混体系中EVA的改性作用,通过HDPE和EVA的分相结构和炭黑的偏析分布降低了体系的室温电阻率,同时应用辐照交联的方法提高了体系的PTC强度,抑制了NTC效应
    It is found that plated wollastonite/HDPE composite, in which filler has a ratio of length, possesses very high PTC intensity and nearly zero NTC effect, as well as low room resistivity.
    我们发现具有一定长径比的镀镍硅灰石/HDPE复合材料拥有特别高的PTC强度、基本没有NTC效应、室温电阻率较低等特性。
    In this paper, a new method of making NTCR semiconductor material was introduced, which could cut the gap of sensitive and temperature components between the international level, and was able to find the appropriate dopant material with NTC effect, combining the fact that thermal resistors have high sensitivity, controlling resistance easy and bad linearity. Then the experiment process was laid out in order.
    本文介绍了制备NTCR半导体材料的新方法,即着重于和国际水平差距很大的感温元件,结合NTC热敏电阻器灵敏度高、阻值易于调控、但线性差的实际,寻找能够产生线性NTC效应的合适的掺杂材料,同时给出规模化的实验流程。
    This paper proposes a new mechanism of PTC/NTC effects of LDPE/Carbon black electrical conductive composites, based on the study of crystallization properties of composites. It shows that PTC effect is mainly caused by thetransition of crystalline phase to amorphous phase and the thermal expansionduring polymer melting, NTC effect is related to the agglomeration effect ofcarbon black particles.
    本文从LDPE/炭黑复合导电材料的结晶性能出发,探讨了复合材料电阻率的正温度系数(PashiveTemperatareCoefficient,简称PTC)效应和负温度系数(NTC)效应的形成机理,认为PTC效应是由聚合物熔融时发生的晶相向非晶相的转变以及由此而产生的热膨胀共同引起,NTC效应主要与炭黑粒子的附聚效应有关。
    The experimental results show that this means can eliminate NTC effect, and improve the reproducibility of the lg ρ ~ T curve, and enhance the PTC intensity.
    实验表明,该法可以消除NTC效应,提高电阻稳定性及PTC强度。
    The results show that among all the factors,the grain boundary composition of the materials plays the dominant role in controlling NTC effect.
    结果表明,材料的化学不均匀性对NTC效应有一定的影响,而材料的晶界成分对NTC效应起决定性的作用。
    The composite oxide ceramics are prepared and electrical conductivity are determined. Results show that the material have stronger NTC effect.
    这种复合氧化物陶瓷的制备方法及电导率的测试结果 ,表明材料具有很强的NTC效应
    An interesting phenomenon was founded that at 400 kGy the NTC effect was nearly eliminated and when the radiation dose raise, the NTC effect reappears. The explanation of this particular behavior was discussed.
    在 4 0 0kGy时 ,NTC效应基本消除 ,当辐射剂量继续增加时 ,NTC效应又重新出现。
    The elimination of NTC effect in CB filled polymer composite could be made by using a very high viscosity polymer as one of the components.
    在复合物中应用粘度非常高的聚合物作为一种组分可以有效消除NTC效应
    It is estimated that the volatilization of Pb and the different concentration of Pb 2+ from grain to grain-boundary are the radical elements resulting in the obvious NTC effect of Sr xPb 1-xTiO 3 ceramics below curie temperature. The semiconducting mechanism of Sr xPb 1-xTiO 3 ceramics is also discussed.
    作者认为在烧结过程中由于存在 Pb挥发 ,使 Srx Pb1 - x Ti O3陶瓷材料中出现了梯度 Pb2 +离子空位及缺陷缔合是 Srx Pb1 - x Ti O3基 V型热敏陶瓷材料产生显著 NTC效应主要原因 ,同时对 Srx Pb1 - x Ti O3陶瓷的半导化机制进行了初步探讨
    Sufficient crosslinking can eliminate NTC effect.
    充分交联可消除材料的 NTC效应
 

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