铜导线一次短路熔痕受热过程中的理化反应  

Physical and chemical reaction of copper conductor primary short circuited melted marks during heating

作　　者：孙卓尔 周洋 李阳 SUN Zhuo-er;ZHOU Yang;LI Yang(Hangzhou Fire and Rescue Division,Zhejiang Hang�zhou 310016,China;China People's Police University,Hebei Langfang 065000,China)

机构地区：[1]杭州市消防救援支队,浙江杭州310016 [2]中国人民警察大学,河北廊坊065000

出　　处：《消防科学与技术》2021年第8期1259-1262,共4页Fire Science and Technology

摘　　要：铜导线一次短路熔痕受到火灾高温作用后将发生一定变化。借助同步热分析技术(TG-DSC),精准控制受热温度,模拟火灾中O2/N2气氛变化,根据TG-DSC曲线分析熔痕发生各种理化反应时的类型和起始温度,辅助判断造成组织变化的原因。结果表明:一次短路熔痕熔点为1062℃,此时熔痕将发生熔化而失去其特征组织;在火灾气氛中,受热温度达到850℃时,将发生氧化反应,产生黑色氧化物颗粒和外围环状氧化带;随着温度的继续升高,环状氧化带将不断增厚,黑色氧化物颗粒不断向晶界处集中。此研究结果对于准确检验鉴定铜导线一次短路熔痕,分析其火灾中的受热过程具有一定的理论参考。The copper conductor primary short circuited melted marks will change to some extent after being affected by high temperature in fire.With the help of synchronous thermal analy-sis technology(TG-DSC),the heating temperature is accurately-controlled,the O2/N2 atmosphere changes in the fire are simulat-ed,the types and initial temperatures of various physical and chemical reactions of the melted marks are analyzed according to the TG-DSC curve,and assisted in judging the causes of the tissue changes.The results show that the melting point of the primary short circuited melted mark is 1062℃,then the mark will melt and lose its characteristic structure.In the fire atmo-sphere,when the heating temperature reaches 850℃,the oxida-tion reaction will occur,and the black oxide particles and the outer ring oxidation belt will be produced.With the increasing of temperature,the annular oxidation zone will be thickened and the black oxide particles will concentrate to the grain bound-ary.The research results have certain theoretical reference for the accurate inspection and identification of the copper conduc-tor primary short circuited melted marks and the analysis of its heat process in fire.

关 键 词：火灾物证鉴定 一次短路熔痕 热分析 理化反应 氧化反应 

分 类 号：X928.7[环境科学与工程—安全科学] D918.91[政治法律—法学]