GOALI/Collaborative Research: Interface Engineered Diamond Coatings for Dry Machining

这项学术联络与工业（GOALI）合作研究项目的目标是研究化学气相沉积（CVD）生长的金刚石薄膜在钴硬质合金（WC-Co）工具上的材料基板加工界面条件。涂层分层是影响金刚石涂层WC-Co刀具寿命的主要因素。通过表面处理和中间层的界面工程，以及优化纳米晶金刚石（NCD）沉积是实现高质量干式加工用金刚石涂层的关键解决方案。这项合作研究将集中在界面制造、性能和功能的基本机制上，以提高基材/涂层在刀具寿命期间的性能，并将形成表面调理、层间界面制备和后续沉积工艺的建模、表征和优化的联合任务。将通过加工分析和磨损表征来验证界面性能的增强。此外，将对金刚石涂层刀具的涂层和干式加工进行环境过程监测，并收集数据进行生命周期盘点和环境影响分析。如果这项研究成功，将导致金刚石涂层刀具的突破，其性能与昂贵的聚晶金刚石刀具相当或更好。中间层和非镉涂层优化工程，以及材料表征和性能分析，将进一步成熟金刚石涂层模具技术的工业应用。这项研究还将推进界面科学的知识，这对涂层系统的功能至关重要，特别是在恶劣的摩擦学服务中。在界面特性和行为建模方面的发现也将为其他涂层系统的研究提供可转换的知识。该计划还将通过为教师和学生提供机会进行研究并获得工业生产过程的经验，从而协同大学与工业伙伴关系。这些合作将为学生提供与工业同事一起工作的机会，并使用他们最先进的设备设施。

The objective of this Grant Opportunity for Academic Liaison with Industry (GOALI) collaborative research project is to investigate the material substrate-processing interfacial conditions in chemical vapor deposition (CVD)-grown diamond films on cobalt-cemented tungsten-carbide (WC-Co) tools. Coating delamination is the major life-limiting factor to diamond-coated WC-Co cutting tools. Interface engineering, by means of surface treatments and interlayer, and optimum nanocrystalline diamond (NCD) deposition are the key solutions to achieve high-quality diamond coatings for dry machining. This collaborative research will focus on the fundamental mechanisms of interface fabrications, properties and functions to enhance the substrate/coating performance over the life of the cutting tools, and will form joint tasks of modeling, characterization, and optimization of surface conditioning, interlayer interfacial preparations, and subsequent deposition processes. Validation of enhancements to interfacial performance will be demonstrated through machining analysis and wear characterization. In addition, environmental process monitoring, in both coating and dry machining with diamond coated tools, will be conducted with data collected for life-cycle inventory and environmental impact analysis.If successful, this research will lead to breakthrough of diamond coated tools whose performance is comparable to or better than costly polycrystalline diamond tools. Engineering of interlayer and NCD coating optimization, with material characterizations and performance analysis, will further mature the diamond coated tooling technology for industrial applications. This research will also advance knowledge of interface science, critical to coating system functions, especially in harsh tribological services. The findings gained on interface characteristics and behavior modeling will also offer knowledge transformable to other coating system studies. The proposed program will also synergize universities-industry partnership by providing opportunities for faculty and students to conduct research and gain experiences with production processes in an industrial setting. The collaborations will offer opportunity to students working with industrial colleagues and use of their state-of-the-art equipment facilities.