Ni-Cr异形电桥的换能规律研究

Study on Energy Conversion Property of Ni-Cr Special Shaped Electric Bridge

为了探索Ni-Cr合金异形电桥的换能规律,采用高速摄影技术对异形电桥在不同恒流激励下的作用过程进行分析,利用高速示波器记录其两端的电压和电流信号,并通过共聚焦显微镜观察异形电桥作用后的表观形貌。结果表明:不同恒流激励条件下异形电桥的换能特性存在差异,电流由小到大对应电热到电爆转化的过程。在小电流激励下以电热换能为主,电桥在集热区最窄处发生熔化或汽化而断开,作用过程中只有发光现象。随着电流的增加,电桥开始出现电爆现象,作用过程中不仅出现发光现象,还伴随着高温颗粒产物向外喷溅。当电流继续增大时,金属电桥完全汽化,并伴随有柱状的火焰产生。

In order to explore the energy conversion property of special shaped electric bridge, the action process under different constant current excitation was analyzed by high-speed photography technology. Meanwhile, the voltage and current signals were recorded by high-speed oscilloscope, and then the apparent morphology was observed by confocal microscope. The results show that the energy conversion property of special shaped electric bridge is different under different constant current excitation, and the current from small to large corresponds to the conversion process from electric-thermal to electric-explosion.Under the small current excitation, the electric-thermal energy conversion property is main form. The melting or vaporization occurs in the narrowest part of the heat collection area of the electric bridge and only luminescence occurs in the process. With the increase of the current, electric-explosion phenomenon appears in the electric bridge, which is accompanied by the high temperature particle products splashing outward. As the current continues to increase, the electric bridge completely vaporizes and is accompanied by a columnar flame.