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

该科学项目的重点是科学探索无硼钝化釉层抗碳结合等静压耐火功能组分的氧侵蚀及其机理。这意味着放弃硼，特别是四硼酸钠，自2010年以来，由于涉及所申报的生育率的健康原因，四硼酸钠非常容易受到影响。特别是在碳结Al_2O_3-C材料中，添加或不添加P、K的CaO-MgO-Al_2O_3-和CaO-MgO-SiO_2-添加剂的影响将被考察。在已有知识的基础上，将在特殊铸钢模拟器上根据塞子和水口的耐蚀性、耐氧性以及与钢液接触时的堵塞性能来探索塞子和水口的部件。加热显微镜、高温X射线衍射仪和扫描电子显微镜/EBSD/FIB分析将支持钝化釉层的形成作为工艺特征的函数的解释，例如循环压制，a)没有脉动，b)在最大压力下脉动，以及c)在压制过程中脉动。基于对关联函数和有序参数，将描述微结构，并将其与涉及氧化、腐蚀和堵塞性能的所获得的性能以及所获得的力学性能相关联。此外，借助ASPEX分析，还将研究新釉料对钢中夹杂物(化学成分、大小和数量)形成的影响。

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.