铜导线短路熔痕组织特征与烟粒子浓度的关系

针对火灾中铜导线短路形成时的不同环境条件,利用光学显微镜研究了环境条件中烟粒子质量浓度对铜导线短路熔痕组织中晶界、孔洞等特征的影响.结果表明:随着烟粒子质量浓度的增大,短路熔痕组织中晶界由连续逐渐向不连续转变,孔洞数量逐渐增多,孔洞的面积分数逐渐增大,孔洞面积分数与烟粒子质量浓度存在一定的对应关系;相同烟粒子质量浓度条件下,黏滞性大的烟粒子对熔痕内部孔洞的生成影响较黏滞性小的烟粒子大.

Relationship Between Smoke Particle Concentration and Structural Characteristics of Trace of Copper Wire Fused Due to Short-Circuit

According to the environment where short-circuit of copper wire stay, the effect of smoke particle concentration on such structural characteristics as grain boundaries and pores as shown in the trace of fused copper wire was investigated. The results showed that with the increasing smoke particle concentration the grain boundaries in the trace turn to discontinuity from continuity and the number and area fraction of pores both increase gradually. It implies that there is a correspondence between the area fraction of pores and smoke particle concentration, i.e. if the concentration remains unchanged, the highly viscous smoke particles affect greater the formation of pores in the trace than lowly viscous smoke particles.