Abstract
Today, high performance applications of cemented carbide cutting tool inserts demand coatings with enhanced wear resistance. Chemical vapour deposited coatings based on Ti(C,N) and Al2O3 are the systems of choice for these applications. The influence of experimental variables on process stability and Al2O3 modification and structure was investigated. Deposition characteristics of Al2O3 as a function of doping combinations, generated by additional gases (TiCl4, BCl3), and deposition temperature are reported. The Al2O3 coatings were deposited in the temperature range of 930–1030 °C at atmospheric pressure. Doping element concentrations and distribution were investigated by inductively coupled plasma mass spectrometry, energy-dispersive X-ray spectra and scanning transmission electron microscopy. Microstrain and substructure were evaluated by high temperature X-ray diffraction analysis and discussed in consideration of doping element type and deposition temperature and phase stability in the application temperature range of 800–1100 °C. The investigations have shown that the deposition rates can be enhanced by doping with Titanium. The temperature range of κ-Al2O3 phase stability during deposition is extended by Boron. Ti-and B-doped κ-Al2O3 exhibited lower full width half maximum values at temperatures above 1000 °C. It was concluded that the kinetic of the κ→α-Al2O3 transformation is affected thereby and results in enhanced wear resistance for high temperature applications of κ-Al2O3 coated cutting tool inserts.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
