“热得快”火灾痕迹试验研究

对处于4种不同状态下的"热得快"从宏观形貌和微观形貌进行比较、观察和分析;同时系统地分析了"热得快"金属管表面形貌特征和电热丝表面形貌特征形成的机理和主要影响因素。结果表明:不同状态下"热得快"金属管宏观形貌特征存在差异,但容易受到火场复杂条件的影响,不能对火灾前"热得快"所处的状态进行定性;通过扫描电子显微镜(SEM)分析技术观察"热得快"电热丝的微观形貌的差异,可以直观快捷地识别"热得快"在火灾前所处的状态,为"热得快"火灾残留物的鉴定提供一种新的鉴定依据和技术方法。

Experimental Study on the Fire Trace of Quick Heaters

Four different states of a quick heater are compared,observed and analyzed from macro-features and micro-features.At the same time,the surface characteristics of the metal tube and the heating wire installed in this heater are analyzed,their forming mechanism and main affecting factors are explored systematically.This research shows that the macro-features of the heater differ with its states,which is much affected by complicated circumstance of fire field,so they can not be used to qualitatively measure the state of the heater.But,the state of a heater can be quickly distinguished according to the difference of the heating wire in micro-features observed by using SEM (Scanning Electronic Microscope).This method provides a new approach for the identification of quick heater remains caused by fire.