GOALI: A Fundamental Investigation of the Design, Processing and Evaluation of a Model, Oxidation Resistant, Functionally-Graded Coating System for Refractory Metals

GOALI：耐火金属模型、抗氧化、功能分级涂层系统的设计、加工和评估的基础研究

• 批准号: 9730775
• 负责人: John Moore
• 金额: $ 38.99万
• 依托单位: Colorado School of Mines
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-05-01 至 2001-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9730775&HistoricalAwards=false
• 关键词: GOALI; Fundamental; Investigation; Design; Processing

9730775 Moore The research program investigates functionally-graded coating systems that incorporate an amorphous diffusion barrier layer. Past research identified a functionally- graded molybdenum-silicon based coating system (MoSi2-SiC), deposited on the refractory metal substrate using physical vapor deposition as a promising processing route. A sufficiently thick, outer layer of MoSi2 can be subsequently applied to the functionally-graded layer using plasma spraying. The earlier research also identified the potential of utilizing MoSi2-SiC composite targets as compared with elemental targets (e.g. Mo, Si, and C). However, a suitable diffusion barrier layer between the MoSi2-SiC functionally-graded coating and the refractory metal substrate must be identified in order to minimize diffusion of silicon and carbon into the refractory (Mo or W) substrate. If this barrier is not used, sub-silicides and carbides of the refractory metals are produced at the coating-substrate interface, resulting in deterioration of oxidation resistance and mechanical properties of the coating system, as well as a reduction in the coating life. A Mo-Si-N-C diffusion barrier has recently been identified that remains amorphous up to 1260C. Thermal cycling of the MoSi2-SiC functionally-graded coating system between the service temperature and room temperature can produce stresses in the coating system. Therefore, finite element modeling will be used to predict the optimized compositional gradient, and coating architecture, i.e. substrate-barrier layer-functionally-graded layer-outer thick kinetic layer, consistent with minimizing the stresses generated, and maintaining oxidation resistance for prolonged times up to 1600C in air. ? Industrial advisors are Mel Jackson (GE Corp. Research and Development) and William Allen (UTRC - East Hartford). These co mpanies have interest in high temperature materials and coatings for materials used in turbine engines. Students spend time in the industrial laboratory research facilities and present their research activities at CSM Center meetings. It is an excellent opportunity for the students to participate in superb industrial materials laboratories in the United States. The MPS OMA Office is co-supporting this GOALI activity. %%% The main objective of this GOALI research program is to explore oxidation-resistant coating systems for refractory metals for application in high temperature, oxidizing environments. The coatings are designed using finite element modeling and deposited by physical vapor deposition using novel MoSi2-SiC or MoSi2-Si3N4 composite targets. The research program is managed in the Advanced Coatings and Surface Engineering Laboratory (ACSEL), an industry- university consortium, at Colorado School of Mines. ***

摩尔9730775 的 研究 方案调查 结合了非晶扩散阻挡层的功能梯度涂层系统。 过去的研究确定了一种功能梯度的基于钼-硅的涂层系统（MoSi 2-SiC），其使用物理气相沉积沉积在难熔金属基底上作为有前景的处理路线。 足够厚的MoSi 2外层可以随后使用以下方法施加到功能梯度层： 等离子喷涂 的 早期的研究还发现， 利用MoSi 2-SiC复合靶材的潜力 与元素靶（例如Mo、Si和C）相比。 然而，必须确定MoSi 2-SiC功能梯度涂层和难熔金属基底之间的合适的扩散阻挡层，以使硅和碳向难熔（Mo或W）基底中的扩散最小化。 如果不使用该阻挡层，则在涂层-基底界面处产生难熔金属的亚硅化物和碳化物，导致涂层的抗氧化性和机械性能劣化。 涂层系统，以及涂层寿命的减少。 最近已经确定了一种Mo-Si-N-C扩散阻挡层，其在高达1260 ℃时保持非晶。 MoSi 2-SiC功能梯度涂层系统在服役期间的热循环 温度和室温可以 在涂层系统中产生应力。 因此，将使用有限元建模来预测优化的成分梯度和涂层结构，即基底-阻挡层-功能梯度层-外部厚动力层，与最小化所产生的应力一致，并在高达1600 C的空气中长时间保持抗氧化性。? 工业顾问是梅尔杰克逊（通用电气公司的研究和开发）和威廉艾伦（UTRC -东哈特福德）。 这些公司对高温材料和用于涡轮机发动机中的材料的涂层感兴趣。 学生花时间在工业实验室研究设施，并在CSM中心会议上展示他们的研究活动。 这是一个很好的机会，让学生参加在美国一流的工业材料实验室。 MPS OMA办公室正在共同支持这一GOALI活动。 该GOALI研究计划的主要目标是探索难熔金属的抗氧化涂层系统 适用于高温、氧化环境。 涂层设计使用 有限元建模并使用新型MoSi 2-SiC或MoSi 2-Si 3 N4复合靶通过物理气相沉积来沉积。 该研究计划是在先进的涂料和表面管理 工程实验室（ACSEL）， 一个 工业-大学联盟，在科罗拉多矿业学院。 ***