PROPERTIES OF SILICON CARBIDE THERMAL PROTECTION IN CERAMIC COATINGS

In recent years, research on the development of protective materials has expanded significantly in order to find efficient and economically viable solutions for application in various industrial segments. Among these materials, those aimed at protecting metallic substrates against high temperatures that end up causing corrosive processes, stand out due to the huge market demand. Advantages such as reproducibility in the process, cost reduction and reduction in environmental impact also directly contribute to the search for protective coatings as an efficient protective alternative. This article presents the characterization of a ceramic coating developed in a previous study that used silicon carbide as a filler, using potassium silicate (water glass) as a matrix (binder), and whose anti-corrosion and thermal protection properties stood out, mainly in applications in the aerospace industry. In this stage of the work, tests of thermal analysis (thermogravimetry) were carried out for the physical and chemical characterization of the material. The results corroborate those previously achieved when applying the coating on components of a hybrid rocket engine tested on a fixed-point bench.近年来，为寻求适用于多工业领域的高效且经济可行的防护材料解决方案，防护材料开发相关研究得到了显著拓展。在这类材料中，用于保护金属基体免受最终引发腐蚀的高温损害的防护材料，因庞大的市场需求而备受关注。该类防护涂层具备工艺可重复性、成本降低与环境影响缩减等优势，这也直接推动了其作为高效防护替代方案的研发探索。本文对一项前期研究中开发的陶瓷涂层进行了表征：该涂层以碳化硅（silicon carbide）作为填料，硅酸钾（potassium silicate，俗称水玻璃）作为基体（粘结剂），其防腐与热防护性能表现突出，尤其适用于航空航天领域的应用场景。在本研究的此阶段，研究人员针对该材料的物理与化学表征开展了热分析（thermogravimetry，热重分析法）测试。本次测试结果与此前将该涂层应用于经定点台架测试的混合火箭发动机（hybrid rocket engine）部件时所获得的结果相一致。