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Thermal degradation behavior of cellulose-based material for gating systems in iron casting production

机译：用于铸铁生产中浇口系统的纤维素基材料的热降解行为

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This study presents a fragment of research aimed at determining the thermal stability of a cellulose-based composite material used for building gating systems for large iron castings. The behavior of the material itself at elevated temperatures is of major significance for the mould filling process. In this research, thermal analysis methods (DTG, TG, DSC) were used to explain the course of the thermal degradation of the analysed material by establishing thermal effects of transformations occurring during its heating as well as its structural and mass changes. The research was conducted at the temperature range of 40 - 1000 °C. The degradation process was found to start at the temperature of approx. 300 °C, and the total mass loss at the range of 300-750 °C amounted to 48.8 %. The mass loss observed is accompanied by very strong exothermal effects. The remaining part of the sample mass which had not decomposed up to the temperature of 1000 °C (approx. 51.2 %) probably represents the carbon fibres and ceramic clay present in the material, because these decompose at a temperature higher than the range of the performed thermal analysis and higher than the temperature of the liquid metal fed into the gating system (about 1300- 1400 °C). In addition, volatile products of degradation were analysed using IR spectrum and the thermogravimetry (TG) method coupled online with mass spectrometry (MS). In the temperature range 300 - 750 °C signals for small molecular masses were noticed, which indicates that the degradation process and fragmentation of polymer chains in the cellulose occur as well as formation of small particle compounds, primarily H2O and CO2. No signals given off by aromatic compounds were detected.
机译：这项研究提出了一部分研究，旨在确定用于大型铸铁浇铸系统的纤维素基复合材料的热稳定性。材料本身在高温下的行为对模具填充过程具有重要意义。在这项研究中，热分析方法（DTG，TG，DSC）用于通过建立在加热过程中发生的转变及其结构和质量变化的热效应来解释被分析材料的热降解过程。该研究是在40-1000°C的温度范围内进行的。发现降解过程始于约200℃的温度。 300°C时，在300-750°C范围内的总质量损失为48.8％。观察到的质量损失伴随着非常强烈的放热效应。样品物料的剩余部分在高达1000°C的温度下仍未分解（约51.2％），可能代表了材料中存在的碳纤维和陶瓷粘土，因为它们在高于温度范围内的温度下分解。进行了热分析，并高于送入浇口系统的液态金属的温度（约1300-1400°C）。此外，使用红外光谱和热重分析（TG）方法在线结合质谱（MS）分析了降解的挥发性产物。在300-750°C的温度范围内，发现了小分子的信号，这表明发生了纤维素中聚合物链的降解过程和断裂，以及小颗粒化合物（主要是H2O和CO2）的形成。没有检测到芳族化合物发出的信号。

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