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首页> 外文会议>ASME turbine blade tip technical symposium 2013 : Turbine blade tip steady and unsteady aerodynamics ... >DEVELOPMENT OF NEW ABRADABLE/ABRASIVE SEALING SYSTEMS FOR CLEARANCE CONTROL IN GAS TURBINES
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DEVELOPMENT OF NEW ABRADABLE/ABRASIVE SEALING SYSTEMS FOR CLEARANCE CONTROL IN GAS TURBINES

机译：燃气轮机间隙控制的新型可磨耗密封系统的开发

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Abradable/abrasive sealing systems are currently used in gas turbines to reduce the blade tip gas leakage and consequently improve the turbine efficiency. The coatings selection is directly related to the section in which they are used. Seal systems for hot gas paths are primarily required to withstand high temperature. The abradable coating should be easily removed by the tip blade without causing significant blade wear, whereas the blades should have sufficient cutting capabilities. Durability properties, such as erosion resistance, are also required. Owing to their temperature capabilities, porous ceramic coatings are successfully used as abradable coatings. Although they are characterized by good abradability properties, their resistance to environmental attacks, such as solid particle erosion, is limited by the porous microstructure which negatively affects their service life. It is apparent that durability and abradability are the main targets to be simultaneously achieved for ensuring longer service life and improved efficiency. The present work is aimed at developing new abradable/abrasive coatings pairs able to ensure both the durability performances of the coatings and good abradability properties. Three ceramic abradable coatings with DVC and porous microstructure have been studied. The down-selection process has been carried out by considering the microstructure, the hardness, the tensile adhesion strength, the erosion resistance, and the furnace cycle test resistance. A composite coating made by NiCoCrAlY matrix containing abrasive grits applied by electrolytic process was selected as abrasive material system. The abrasive grits (patent application in process by GE Oil&Gas) consists of a mixture of ceramic particles. These grits ensure both short-term cutting capability and thermal stability, assuring the clearance maintenance over time. The abradability of the seal system was assessed by a properly designed test, namely Rub Rig test, which simulates the blade incursion in the abradable coating. Surface patterns on abradable coating were also considered to further enhance the abradability. Engine tests are foreseen for assessing the service behavior of this seal system.
机译：目前，可燃气体/磨料密封系统用于燃气轮机中，以减少叶片尖端气体泄漏，从而提高燃气轮机效率。涂层的选择与使用部分直接相关。热气路径的密封系统主要需要承受高温。易磨损的涂层应易于由尖端刀片除去，而不会引起刀片的明显磨损，而刀片应具有足够的切割能力。还需要耐用性，例如耐蚀性。由于它们的温度能力，多孔陶瓷涂层已成功地用作耐磨涂层。尽管它们的特点是具有良好的耐磨性，但它们对诸如固体颗粒侵蚀之类的环境侵蚀的抵抗力却受到多孔微结构的限制，这会对它们的使用寿命产生负面影响。显然，耐用性和耐磨性是要同时确保延长使用寿命和提高效率的主要目标。当前的工作旨在开发能够确保涂层的耐久性能和良好的耐磨性的新型耐磨/磨料涂层对。研究了三种具有DVC和多孔微结构的陶瓷耐磨涂层。通过考虑微观结构，硬度，拉伸粘合强度，耐蚀性和炉膛试验耐性来进行向下选择过程。选择由NiCoCrAlY基体制成的复合涂层作为磨料系统，该复合涂层包含通过电解工艺施加的磨料。磨料砂砾（GE Oil＆Gas正在申请专利）由陶瓷颗粒的混合物组成。这些砂粒可确保短期切削能力和热稳定性，从而确保随时间的间隙维护。密封系统的耐磨性是通过适当设计的测试（即“摩擦钻机”测试）进行评估的，该测试可模拟刀片在可磨耗涂层中的侵入。还考虑了耐磨涂层上的表面图案以进一步提高耐磨性。预计将进行发动机测试以评估该密封系统的使用性能。

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