【摘要】：為建立電氣火災(zāi)物證鑒定關(guān)于一次短路熔痕和二次短路熔痕的量化分析,研究外熱條件對(duì)短路熔痕的影響,借助X射線衍射儀和掃描電鏡及能譜儀,分析短路熔痕的微觀結(jié)構(gòu)和成份信息。實(shí)驗(yàn)結(jié)果顯示:在特定的熱處理時(shí)間變化趨勢(shì)下,一次短路熔痕晶粒大小的發(fā)展趨勢(shì)與熱處理時(shí)間趨勢(shì)一致,二次短路熔痕晶粒大小的發(fā)展方向與熱處理時(shí)間的變化趨勢(shì)相反,而且,一次短路熔痕織構(gòu)系數(shù)的平均值隨外熱溫度的上升,先增大后減小,二次短路熔痕織構(gòu)系數(shù)的平均值只在較小數(shù)值范圍內(nèi)波動(dòng)。進(jìn)一步分析短路熔痕不同區(qū)域的化學(xué)成份發(fā)現(xiàn),一次短路熔痕和二次短路熔痕主要含有C、O和Cu三種元素,在熔痕的沉積層,一次短路熔痕的氧含量約為6%,二次短路熔痕的氧含量約為3%,但在熔痕基體區(qū),一次短路熔痕和二次短路熔痕的氧含量基本無(wú)變化,均在3%左右,不隨外熱溫度和熱處理時(shí)間變化。從研究結(jié)果可知,在600℃內(nèi)的電氣火災(zāi)中,短路熔痕隨外熱溫度和熱處理時(shí)間變化的相關(guān)數(shù)據(jù)可以成為短路熔痕量化分析的基礎(chǔ)。
[Abstract]:In order to establish the quantitative analysis of primary and secondary short-circuit melting marks and to study the influence of external heat conditions on short-circuit melting marks, X-ray diffractometer, scanning electron microscope and energy spectrometer were used to establish the evidence of electrical fire. The microstructure and composition information of short-circuit melting mark are analyzed. The experimental results show that the development trend of the grain size of the primary short-circuit melting mark is consistent with that of the heat-treatment time, and the developing direction of the grain size of the secondary short-circuit melting mark is opposite to that of the heat-treatment time under the changing trend of the specific heat treatment time. Moreover, the average value of the texture coefficient of the primary short-circuit melting mark increases at first and then decreases with the increase of the external heat temperature, and the average value of the texture coefficient of the secondary short-circuit melting mark fluctuates only in the smaller range of the numerical value. Further analysis of the chemical composition of different regions of short-circuit melting marks shows that the primary and secondary short-circuit fuses mainly contain C, O and Cu elements, and the oxygen content of the primary short-circuit melting marks is about 6% in the deposition layer of the melting marks, and the oxygen content of the primary short-circuit melting marks is about 6%. The oxygen content of the secondary short-circuit weld is about 3%, but the oxygen content of the primary-short-circuit and the second-short-circuit fusion is almost unchanged in the base region of the weld, and is about 3%, not with the external heat temperature and heat treatment time. The results show that in the electric fire at 600 鈩，

本文編號(hào)：2465826