Microstructure and Mechanical Properties of κ-Al₂O₃/TiCN Coating Prepared by CVD

Abstract:

The κ-Al2O3/TiCN multilayer coatings have been deposited on cemented carbide cutting tools using chemical vapor deposition (CVD). The morphology of the surface and cross-section were examined by scanning electron microscope (SEM). The adhesion force and scratch resistance of κ-Al2O3/TiCN coating were determined by CSM scratch tester. The results showed that the etching reagents and etching times had an evident influence on the morphology of the cross-section of κ-Al2O3/TiCN coating. The surface of κ-Al2O3/TiCN coating exhibited hexagon grain structure. The κ-Al2O3 layer showed columnar structure while the TiCN layer exhibited fibrous structure with long-needle grains. The results of scratch testing indicated that the -Al2O3/TiCN coating failed at coating/substrate and layer/layer interface by delaminating rather than by cracking or chipping due to long needle-like and columnar structure.

• Periodical: Applied Mechanics and Materials (Volumes 52-54)
• Pages: 1766-1770
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.52-54.1766
• Online since: March 2011
• Authors: Zheng Bing Qi, Peng Sun, Zhou Cheng Wang, Chong Hu Wu
• Keywords: Coating, CVD, Mechanical Property, Microstructure

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