Active oxidation protection coatings for Mo-Si-B high temperature materials

Mo-Si-B高温材料活性氧化防护涂层

• 批准号: 317275772
• 负责人: Professorin Dr.-Ing. Manja Krüger
• 金额: --
• 依托单位: Institut für Werkstoff- und Fügetechnik (IWF)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/317275772?language=en
• 关键词: Active; oxidation; protection; coatings; Mo

Due to an increase in efficiency, the high-temperature stabile material Mo-Si-B is intensely investigated as a substitute material in combustion turbines. A problem not solved yet in this material system is its oxidation behavior: the Mo component shows pesting in form of Mo(IV) oxid formation. The intrinsic material protection mechanism– the oxidation of near-surface Si and B and its reaction to form an oxygen diffusion limiting glass layer – is insufficient. Aim of this work is to develop a novel-type, active multi-layer environmental barrier coating with an initial protective glass layer formation at low temperatures (500 °C to 800 °C), and a high oxygen-trapping capacity and oxygen diffusion inhibition layer under service conditions (1100 °C to 1200 °C). These layers are based on a perhydropolysilazane filled with particulate Si-, B-, Ti and/or Al-containing components of variable particle size and volume fraction, and it will be applied by dip coating of Mo-Si-B substrate materials followed by heat treatment for the conversion into an active ceramic material (layer conditioning) and heat treatment under service-like conditions. Standard methods will be carried out for solid-state sample characterization after conditioning and treatment under service-like conditions. XPS investigations will give a deeper insight into protective-layer formation mechanisms and nanoindentation experiments allow to characterize and to understand the layers´ mechanical properties. The results will be used for models development to understand the physicochemical layer formation and their function under service conditions. This will help to transfer the development of protective layers for other than Mo-Si-B refractory based alloys.

由于效率的提高，高温稳定材料Mo-Si-B被深入研究为组合涡轮机中的替代材料。在该材料系统中尚未解决的问题是其氧化行为：MO成分以MO（IV）氧化物形成的形式显示了粘发生。固有的材料保护机理 - 近地表Si和B的氧化及其形成氧扩散限制玻璃层的反应 - 不足。这项工作的目的是在低温（500°C至800°C）下开发一种新颖的，主动的多层环境屏障涂层，并在低温下形成初始保护的玻璃层，并在服务条件下（1100°C至1200°C），高氧气捕获能力和氧气扩散层抑制层。这些层是基于一个含有颗粒的粒子粒子和/或含有颗粒的含量粒径和体积分数的含有颗粒的si-，b-，ti和/或含有al的含量的层的层，它将通过浸入Mo-Si-b底物材料的浸入涂层，然后通过热处理（层状态）和热处理下的热处理进行热处理，并通过热处理进行热处理。标准方法将在调节和在类似服务状态下进行调节和治疗后进行固态样品表征。 XPS的研究将使人们对保护性层的形成机理和纳米识别实验有更深入的了解，可以表征和理解层的机械性能。结果将用于模型开发，以了解在服务条件下的物理层形成及其功能。这将有助于将受保护层的开发用于基于MO-SI-B难治的合金以外的其他。