GOALI/Collaborative Research: A Combined Materials and Mechanics Study on Failure and Materials Improvement of Coating/Substrate Interfaces

该GOALI项目是路易斯安那州立大学（LSU）、范德比尔特大学（Vanderbilt）和铁姆肯公司（Timken）的合作项目，主要研究表面工程领域的一个子课题。我们计划对陶瓷涂层与基体界面的断裂韧性如何取决于界面区域的结构和化学性质进行系统的研究。我们的计划结合了涂层/界面层合成、原子级结构/化学表征和定量界面断裂韧性测量。这种关于界面区域的结构和化学如何影响其抗断裂性的详细材料/力学研究是在特定应用中为涂层/基体界面建立定量材料设计标准的关键。通过涂层改变近表面机械/化学性能对于传统机械和运输行业以及新兴的微机电系统（MEMS）行业的应用非常重要。涂料的正确应用可以使宏观/微观尺度的机械系统和制造技术超越当前的外壳。更好地了解涂层系统的故障对于“旧”（例如机械和运输）和“新”（例如MEMS）行业的未来成功至关重要。路易斯安那州立大学、范德比尔特大学和铁姆肯公司的这个GOALI项目建立在过去和正在进行的关于涂层/界面/基板系统（LSU）的合成和结构/化学表征、层状材料的新型机械性能表征，特别是它们的界面（Vanderbilt）的重要研究基础上。工业合作伙伴（铁姆肯公司）的参与为涂层部件的摩擦学测试提供了额外的专业知识，并在工程接触条件下建立了界面机械性能和性能之间的牢固联系。路易斯安那州立大学-范德比尔特-铁姆肯公司的合作是跨学科的，并承诺为路易斯安那州立大学和范德比尔特大学的学生提供更多的教育机会。我们现有的路易斯安那州立大学和南方大学的教育合作为少数民族学生提供了了解和参与前沿研究的机会，并推动了NSF？美国在研究和教育方面的目标。

This GOALI project is a collaborative effort between Louisiana State University (LSU), Vanderbilt University (Vanderbilt), and the Timken Company (Timken), and concentrates on a subtopic within the field of surface engineering. We plan to conduct a systematic investigation of how the fracture toughness of the interface between a ceramic coating and a substrate depends on the structure and chemistry of the interface region. Our plan combines coating/interfacial layer synthesis, atomic-level structural/chemicalcharacterization, and quantitative interfacial fracture toughness measurements. Such a detailed materials/mechanics study on how the structure and chemistry of the interfacial region impact its fracture resistance is the key to establishing quantitative materials design criteria for coating/substrate interfaces in specific applications.Modifying the near-surface mechanical/chemical properties by applying coatings is important to applications in the traditional machinery and transportation industries and to the emerging micro-electromechanical systems (MEMS) industries. Correct applications of coatings enable macro/micro scalemechanical systems and manufacturing techniques to perform beyond their current envelopes. A better understanding of the failure of coated systems is critical to the future success of "old" (e.g., machinery and transportation) and "new" (e.g., MEMS) industries.This GOALI project from LSU, Vanderbilt, and Timken builds on significant past and ongoing research on the synthesis and structural/chemical characterization of coating/interface/substrate systems(LSU), novel mechanical property characterization of layered materials, and in particular, their interfaces (Vanderbilt). The participation of the industrial partner (Timken) offers added expertise in tribological testing of coated components, and establishes a firm connection between interfacial mechanical properties and performance under engineering contact conditions.This LSU-Vanderbilt-Timken collaboration is interdisciplinary, and promises enhanced educational opportunities for LSU and Vanderbilt students. Our existing LSU/Southern University educational collaborations offer opportunities for minority students to be informed of and involved in cutting-edge research, and advance NSF?s goals in both research and education.