Invited Speaker

Assoc. Prof. Fei Cai

School of Materials Science and Engineering, Anhui University of Technology

E-mail: caifei20150126@163.com

Title: Preparation of Boron-containing Hard Coatings with High Hardness Yet Toughness and Research on the High-speed Dry Cutting Performance Against Titanium Alloys

Profile: 

He focuses on the interface and performance regulation of metal surface protective coatings. He published 31 SCI papers in top-level journals, e.g Corrosion Science as the first author/Corresponding author, authorized 14 invention patents, and participated in the formulation of 3 ISO international standards and 2 China national standards. He hosted more than 10 projects including National Key Research and Development Program (sub-project) and the National Natural Science Foundation. He won the Anhui Provincial Science and Technology Progress Award (first prize, ranked 2nd and 10th) twice and the China Standard Innovation Contribution Award (third prize, ranked 3rd).

Abstract: 

Titanium alloys (e.g., Ti-6Al-4V) have been extensively applied for their outstanding features such as high specific strength and corrosion resistance. The high-speed dry cutting is a promising technique to satisfy the growing demands for economic efficiencies and environmental policies, and synthesizing hard coating on the tools is an effective method to improve the high-speed dry cutting performance of them. Nonetheless, under the high-speed dry machining condition, the coated tools usually suffer large wear loss and reduced lifetime under the synergistic effect of cutting forces and heats ascribed to the machining features of Ti alloys such as low thermal conductivity, high chemical activity and work hardening. In recent years, the boron-doped coatings such as AlTiBN and AlCrBN hard coatings which combine the splendid thermal stability of Al-based coating and self-lubrication effect of boron, are prospective for application in high-speed dry cutting of Ti alloys. In this work, AlTiBN coatings with various B contents and AlTiN/AlTiBN multilayer coating with various multilayer structures were synthesized via the cathodic arc ion plating method. The influences of B content and multilayered structure on the chemical compositions, micro-structure, mechanical properties, impacting fatigue resistances and high-temperature properties have been investigated. Furthermore, the cutting performances, wear mechanisms and coating-failure behavior of the coated tools have been assessed and analyzed.