论文部分内容阅读
使用火场环境模拟设备对工业纯Cu及Q235钢在600,700及800℃条件下的火场燃烧环境进行暴露,通过光学显微镜对其表面的氧化物层进行观察,重点分析表面氧化层剥落特点及其原因。结果表明:与相同温度空气中暴露相比,火场燃烧环境进行暴露后两种金属材料表面的氧化物层厚度成倍增加,冷却至室温后为层状,而且有大量的开裂区域存在;工业纯Cu在煤油气氛环境中的氧化性能变化更为明显,表面氧化膜的粘附性严重蜕化,在整个实验过程中均发生明显的剥落;Q235钢在高温煤油燃烧环境气氛中生成的氧化物层粘附性和表面颜色显著不同,这与其所处环境中的气体成分密切相关。以上研究结果可为火灾现场的温度、燃烧时间及是否有助燃剂的加入提供初步的判断依据。
The field combustion environment of industrial pure Cu and Q235 steel at 600, 700 and 800 ℃ was exposed by using fire environment simulation equipment. The oxide layer on the surface was observed by optical microscope. The characteristics and causes of the surface oxide layer flaking were analyzed emphatically. The results show that the thickness of the oxide layer on the surface of the two metal materials increases exponentially when exposed to the fire environment compared with that at the same temperature. After cooling to room temperature, the thickness of the oxide layer is lamellar and there are a large number of cracking areas. The oxidation behavior of Cu in kerosene atmosphere is more obvious. The adhesion of the surface oxide film is seriously degenerated, and it is obviously exfoliated during the whole experiment. The oxide layer of Q235 steel is oxidized in the high temperature kerosene combustion environment Apperance and surface color are significantly different, which is closely related to the gas composition of the environment in which they are located. The results of the above research can provide the preliminary judgment basis for the temperature, burning time and the presence of combustion improver on the fire site.