铸铁中碳测定方法的改进

摘要

Carbon is the most important element in cast iron. It therefore has to be constantly monitored during the casting process. Sample taking is critical, too slowly chilling produces graphite inclusions. However, it is well known that spark emission spectrometers need completely graphite-free samples to produce accurate results. The reasons for this requirement are investigated and discussed. Finally the principles and capabilities of a new carbon determination method are described. This method improves the accuracy of the carbon determination in suboptimal cast iron samples, and indicates if poorly taken samples are measured.%碳是铸铁中最重要的元素.因此,在铸造过程中需要经常对碳进行监控.取样过程非常关键,冷凝速度过慢就会产生石墨夹杂.然而,火花直读光谱仪进行测定时需要完全不含石墨的样品才能得到精确的测量结果.本文对这种要求的原因进行了研究和讨论,并对一种测定碳新方法的原理和可行性进行了阐述.该方法改进了测定未达到最佳标准要求的铸铁样品中碳含量的准确性,并能提示取样过程是否恰当.