STTR Phase I: A CBN/TiN Nanocomposite Coating for Cutting Tools

这个小企业技术转让（STTR）第一阶段项目将开发一种新型涂层，最初用于硬车削刀具应用，使用新的混合涂层技术。 具体地，提出使用cBN粉末的静电喷涂（ESC）和TiN的化学气相渗透（CVI）的组合来开发立方氮化硼-氮化钛（cBN-TiN）纳米和微米颗粒复合涂层。该项目将遵循一个概念，即初步工作表明，可以使用ESC/CVI组合在实际的混合沉积工艺中沉积厚的cBN/TiN复合涂层，并且使用这种方法涂覆的切削刀具可以显著改善加工性能。在商业上，cBN刀具是加工硬化铁合金和高温合金刀具的优秀候选者。 cBN涂层工艺的开发可以规避现有工具的限制，从而在cBN工具根本不存在的情况下（例如， 断屑器刀片、圆柄刀具如端铣刀和钻头）。

This Small Business Technology Transfer (STTR) Phase I project will develop a novel class of coatings, initially for hard turning cutting tool application, using a new hybrid coating technology. Specifically, it is proposed to develop cubic boron nitride-titanium nitride (cBN-TiN) nano and micro particulate composite coatings using a combination of electrostatic spray coating (ESC) of cBN powder and chemical vapor infiltration (CVI) of TiN. The project will follow a concept where initial work indicates that a thick cBN/TiN composite coating can be deposited in a practical hybrid deposition process using the ESC/CVI combination, and that cutting tools coated using this method can provide significant improvement in machining performance. Commercially, cBN tools are excellent candidates for machining hardened ferrous alloys and superalloys tools. Development of a cBN coating process can circumvent limitations of existing tools and thereby provide a significant improvement in cutting tool selection, productivity and application range where cBN tools simply do not exist (e.g., chip-breaker inserts, round-shank tools such as end-mills, and drills).