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（范德比尔特）和铁姆肯公司（Timken）之间的合作成果，专注于表面工程领域的一个子课题。我们计划进行一个系统的研究陶瓷涂层和基体之间的界面断裂韧性如何取决于界面区域的结构和化学。我们的计划结合涂层/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。对界面区域的结构和化学性质如何影响其抗断裂性能进行详细的材料/力学研究是建立特定应用中涂层/基体界面定量材料设计标准的关键，通过施加涂层来改变近表面的机械/化学性质对于传统机械和运输工业以及新兴的微机电系统（MEMS）的应用具有重要意义。行业涂层的正确应用使宏观/微观尺度的机械系统和制造技术能够超越其当前的信封。更好地了解涂层系统的故障对“旧”系统（例如，机械和运输）和“新的”（例如，LSU、范德比尔特和铁姆肯公司的GOALI项目建立在过去和正在进行的关于涂层/界面/基材系统（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（范德比尔特）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。LSU-范德比尔特-铁姆肯公司的合作是跨学科的，并有望为LSU和范德比尔特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/南方大学的教育合作提供机会，少数民族学生被告知和参与前沿研究，并推进NSF？的研究和教育目标。

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.