Boron-free environmentally friendly protective glazes for carbon-bonded isostatically pressed refractory functional components

科学项目的重点是对无硼钝化釉层抗氧侵蚀碳键等静压耐火功能组分的科学探索和机理的理解。这实现了硼，特别是四硼酸钠的弃用，自2010年以来，由于健康原因，四硼酸钠极易影响所宣布的生育能力。特别是在碳键合Al2O3-C材料中，将研究添加或不添加P和K的CaO-MgO-Al2O3-和cao - mgo - sio2 -添加剂的影响。基于所获得的知识模型，将在一个特殊的铸钢模拟器中，根据塞器和喷嘴的耐腐蚀、耐氧和与钢熔体接触的堵塞性能，对其部件进行探索。加热显微镜，HT-XRD以及SEM/EBSD/FIB分析将支持钝化釉层形成的解释，作为加工特征的函数，如循环压制，a)无脉动，b)在最大压力下有脉动，c)在压制过程中有脉动。基于对相关函数和有序参数，描述了微观结构，并将其与氧化、腐蚀和堵塞性能以及机械性能相关联。此外，借助于ASPEX分析，还将研究新釉料对钢中夹杂物形成（化学成分、大小和数量）的影响。

The focus of the scientific project is dealing with the scientific exploration of boron-free passivation glaze layers against oxygen attack of carbon bonded isostatically-pressed refractory functional components and the understanding of the mechanisms. This implements the abandonment of boron and especially of sodiumtetraborate, which is since 2010 as very susceptible for healthy reasons dealing with the fertility declared. Especially in carbon bonded Al2O3-C materials the impact of CaO-MgO-Al2O3- und CaO-MgO-SiO2-additives with or without P and K will be investigated. Based on the gained knowledge model components of stoppers and nozzles will be explored according to their corrosion- and oxygen-resistance as well as clogging performance in contact with steel melt in a special steel casting simulator. Heating microscopy, HT-XRD as well as SEM/EBSD/FIB analysis will support the interpretation of the formation of the passivation glaze layer as a function of the processing features such as cycling pressing, a) without pulsation, b) with pulsation at the maximum pressure and c) pulsation during pressing up. Based on pair correlation functions and order parameters the micro- structure will be described and correlated to the achieved properties dealing with the oxidation-, corrosion- and cloghing-performance as well as the achieved mechanical properties. In addition with the aid of ASPEX analysis the impact of the new glaze on the formation of inclusions (their chemistry, size and population) in the steel will be investigated.