氧化锌压敏电阻器耐冷热冲击性的影响因素研究OA

The various influencing factors on the thermal shock resistance of zinc oxide varistor are investi-gated,including epoxy powder encapsulation material,residual flux and cleaning agent,lead diameter of zinc oxide varistor,silicone inner coating,degree of curing of encapsulation material,as well as thermal shock conditions.It has been found that different epoxy powder encapsulation materials have a significant impact.The residual flux can seriously deteriorate the thermal shock resistance,and the cleaning effect of different cleaning agents varies.Insufficient curing of epoxy powder encapsulation material can reduce its resistance to cold and hot impacts.Silicone inner coating,due to poor compatibility with epoxy,will sig-nificantly deteriorate its resistance to cold and hot impacts.Among different thermal shock conditions,the impact is more obvious in the low-temperature zone.