Reversible thermal fusing model of carbon black current-limiting thermistors
Reversible thermal fusing model of carbon black current-limiting thermistors
复制标题
炭黑限流热敏电阻的可逆热熔断模型
DOI：
10.1103/physrevb.62.9390
复制
发表时间：
2000
影响因子：
3.7
通讯作者：
M. B. Heaney
中科院分区：
文献类型：
--
作者：
James E. Martin;M. B. Heaney
聚乙烯中炭黑颗粒的复合材料随着施加的电场的增加而表现出异常快速的电阻率增加，使得这种材料在商业上可用作限流晶闸管，也称为自动复位保险丝。在这种应用中，复合材料与它所保护的电路串联：在低施加电压下，电路是负载，但在高施加电压下，复合材料成为负载，限制电路的电流。我们提出了一个简单的模型，这种行为的一个网络的非线性电阻。每个电阻器的电阻值明确且可逆地取决于其瞬时功耗。该模型预测，在软熔断，或限流，制度，其中通过复合材料的电流随着电压的增加而降低，片状耗散不稳定性发展正常的所施加的领域，与实验观察，这仅仅是由于在微观结构中的波动。
Composites of carbon black particles in polyethylene exhibit an unusually rapid increase in resistivity as the applied electric field is increased, making this material commercially useful as current-limiting thermistors, also known as automatically resettable fuses. In this application the composite is in series with the circuit it is protecting: at low applied voltages the circuit is the load, but at high applied voltages the composite becomes the load, limiting the current to the circuit. We present a simple model of this behavior in terms of a network of nonlinear resistors. Each resistor has a resistance that depends explicitly and reversibly on its instantaneous power dissipation. This model predicts that in the soft fusing, or current-limiting, regime, where the current through the composite decreases with increasing voltage, a platelike dissipation instability develops normal to the applied field, in agreement with experimental observations, which is solely due to fluctuations in the microstructure.