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

GOALI合作研究项目的目标是研究在钴硬质合金工具上化学气相沉积(CVD)生长的金刚石薄膜中的材料衬底加工界面条件。涂层剥离是影响金刚石涂层WC-Co刀具寿命的主要因素。通过表面处理和过渡层的界面工程以及最佳的纳米金刚石(NCD)沉积是获得高质量干式加工金刚石涂层的关键解决方案。这项合作研究将集中于界面制备的基本机制、性能和功能，以在刀具寿命内提高基材/涂层的性能，并将形成表面处理、界面界面准备和后续沉积过程的建模、表征和优化的联合任务。将通过机械加工分析和磨损表征来验证界面性能增强的有效性。此外，还将利用为生命周期清单和环境影响分析收集的数据，对金刚石涂层工具的涂层和干切削过程进行环境监测。如果成功，这项研究将导致性能可与昂贵的聚晶金刚石工具相媲美或更好的钻石涂层工具的突破。夹层工程和NCD涂层优化，以及材料特性和性能分析，将进一步成熟工业应用中的金刚石涂层工具技术。这项研究还将促进界面科学的知识，这对涂层系统的功能至关重要，特别是在苛刻的摩擦学服务中。在界面特征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化的知识。拟议中的计划还将通过为教职员工和学生提供在工业环境中进行研究和获得生产过程经验的机会，来协同大学和行业合作伙伴关系。这些合作将为学生提供与行业同行合作并使用他们最先进的设备设施的机会。

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.