STTR Phase I: Demonstration of Enhanced Corrosion Resistance using a Nano-composite Thermal Barrier Coating

STTR 第一阶段：使用纳米复合热障涂层增强耐腐蚀性的演示

• 批准号: 0637297
• 负责人: Michael Cutbirth
• 金额: $ 15万
• 依托单位: Mainstream Engineering Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0637297&HistoricalAwards=false
• 关键词: STTR; Phase; Demonstration; Enhanced; Corrosion

This Small Business Technology Transfer (STTR) Phase I project will experimentally validate the theory that inclusion of nanostructures within the Thermal Barrier Coatings (TBC) will enhance the resistance to hot corrosion by increasing the fracture strength of the ceramic thereby inhibiting grain growth similar to reinforcing concrete with rebar. The grain growth leads to the formation and growth of interconnected cracks needed for wicking of molten salts that result in spallation. The novel nanocomposite coating would find application within fossil energy power generation devices (dirty fuel) and aircraft engines (marine environments). Current technology turbine blades are comprised of single crystal nickel superalloys. Historically, protective TBC have allowed for operation of the turbine while subjected to hot gases exiting the combustor at temperatures exceeding the superalloy melting point. The increase in turbine inlet temperature has yielded improvements in efficiency, power density, and emission quality. However, these protective barriers are susceptible to hot corrosion, an electrochemical reaction between the superalloy and molten salts resulting in spallation or fragmentation of the thermal barrier coating. The reduction of premature spalling will allow for the simultaneous increase of the turbine inlet temperature and the reduction of the turbine coolant air. This combination has the potential to increase efficiency, reduce toxic emissions, and save capital costs.

这个小企业技术转让（STTR）第一阶段项目将通过实验验证理论，即在热障涂层（TBC）中加入纳米结构将通过增加陶瓷的断裂强度来增强抗热腐蚀性，从而抑制晶粒生长，类似于用钢筋加固混凝土。 晶粒生长导致熔融盐芯吸所需的互连裂纹的形成和生长，从而导致飞溅。 这种新型纳米复合材料涂层将在化石能源发电设备（脏燃料）和飞机发动机（海洋环境）中得到应用。 当前技术的涡轮机叶片由单晶镍超合金构成。 历史上，保护性TBC允许涡轮机在经受以超过超合金熔点的温度离开燃烧器的热气体时操作。 涡轮机进口温度的提高提高了效率、功率密度和排放质量。 然而，这些保护性屏障易受热腐蚀、超合金与熔融盐之间的电化学反应的影响，从而导致热障涂层的剥落或碎裂。 过早剥落的减少将允许同时增加涡轮机入口温度和减少涡轮机冷却剂空气。 这种组合有可能提高效率，减少有毒排放，并节省资本成本。