Research Initiation Award: Multi-layer Composite Coatings for High Speed Machining

该项目的目标是开发用于高速加工钢和铸铁的硬质合金刀具刀片的多层复合涂层。将采用激光物理气相沉积的非平衡加工。设计并建造了一个多目标高真空室，该室具有保持选择性环境和原位工艺的设施。碳化钛将沉积在碳化钨刀具刀片上，形成初始附着涂层。多层复合涂料将得到发展。激光参数、涂层厚度和层数将得到优化，以获得高质量的涂层。涂层将使用现代分析技术进行表征，以确定界面的第二相形成、相互扩散、偏析和外延性质。将对涂层的机械性能进行评估。涂层刀具将在高速加工中进行测试，以确定磨损和失效机制。该项目将导致切削刀具涂层的发展，具有更好的耐磨性，这将提高加工生产率。

The object of the project is to develop multilayer composite coatings on carbide tool inserts for high speed machining of steel and cast iron. Nonequilibrium processing using laser physical vapor deposition will be employed. A multitarget, high vacuum chamber with facilities to maintain selective environment and in- situ process the coatings has been designed and constructed. Titanium carbide will be deposited on tungsten carbide tool insert to form and initial adherent coating. Multilayer composite coatings will be developed. Laser parameters, thickness and number of the layers of the coatings will be optimized to achieve high quality coatings. The coatings will be characterized using modern analytical techniques to determine second phase formation, interdiffusion, segregation, and epitaxial nature of the interface. Mechanical properties of the coatings will be evaluated. The coated tools will be tested in high speed machining to determine the wear and failure mechanisms. The project should lead to the development of coatings for cutting tools with improved wear resistance which should allow increased productivity in machining.