Next Generation of Abradable Coatings for Intermediate Gas Turbine Compressor Stages: Manufacturing Process Development

用于中间燃气轮机压缩机级的下一代耐磨涂层：制造工艺开发

• 批准号: 543864-2019
• 负责人: Jodoin, Bertrand
• 金额: $ 3.78万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=698828
• 关键词: Next; Generation; Abradable; Coatings; Intermediate

A compressor blade must have a clearance gap between its tip and the engine casing to avoid the blade from seizing and damage. This gap is typically sealed with an abradable (soft) coating to prevent air flowing back over the blade tip during service. To allow safe operation at elevated temperatures typically found in high-pressure compressor stages (up to 500°C), abradable coating matrices are manufactured using secondary phases such as solid lubricants, to minimize the coating's material transfer and promote abradability. AlSi-hBN is a potential metal matrix-solid lubricant coating material successfully manufactured by means of plasma spraying [ref]. However, its abradability is currently limited, mainly due to the inability of the plasma spray process to retain a sufficient amount of hBN in the coating. The proposed project aims at determining if the pulsed gas dynamic spray process (PGDS) can be adapted and developed to produce Al-Si+hBN coatings with properties (microstructure, hardness, adhesion, abradability) meeting the industrial collaborator specifications. Fundamental research is required to increase the understanding of the PGDS application method mechanisms and its ability to improve AlSi+hBN coatings durability.

压缩机叶片的尖端和发动机壳体之间必须有间隙，以避免叶片卡住和损坏。该间隙通常用耐磨（软）涂层密封，以防止空气在使用过程中流回叶片尖端。为了能够在高压压缩机级通常出现的高温（高达 500°C）下安全运行，使用固体润滑剂等第二相制造耐磨涂层基质，以最大限度地减少涂层的材料转移并提高耐磨性。 AlSi-hBN 是一种潜在的金属基固体润滑涂层材料，通过等离子喷涂成功制造[参考]。然而，其耐磨性目前受到限制，主要是由于等离子喷涂工艺无法在涂层中保留足够量的六方氮化硼。拟议项目旨在确定是否可以采用和开发脉冲气体动态喷涂工艺 (PGDS)，以生产性能（微观结构、硬度、附着力、耐磨性）满足工业合作者规范的 Al-Si+hBN 涂层。需要进行基础研究来加深对 PGDS 应用方法机理及其提高 AlSi+hBN 涂层耐久性的能力的理解。