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Hybrid CO2 laser waterjet heat (LWH) treatment of bindered boron nitride composites with hardness improvement
Affiliation:1. Mechanical Engineering College, Tianjin University of Science and Technology, Tianjin 300222, China;2. Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA;1. UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk ridge, PO Box 392, Pretoria-South Africa;2. Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure road, Somerset West 7129, PO Box 722, Somerset West, Western Cape, South Africa.;3. Physics Department, Politecnico di Milano, Piazza Leonardo Da Vinci, 32, 20133 Milano, Italy;4. Department of MechanicalEngineereing, Politecnico di Milano,Via La Masa 1, 20156 Bovisa, Italy;5. IFN-CNR, Piazza Leonardo da Vinci, 23, 20133 Milano, Italy;6. University of the Free State, Physics Department, 205 Nelson Mandela Drive, Park West, Bloemfontein, 9301;1. Physical Chemistry Department, National Research Centre, 33 E l Bohoth St. (Former El Tahrir St.), Dokki, P.O. 12622, Giza, Egypt;2. Glass Research Department, National Research Centre, 33 E l Bohoth St. (Former El Tahrir St.), Dokki, P.O. 12622, Giza, Egypt;1. School of Materials Science and Technology, Xi’an University of Technology, Xi’an 710048, China;2. College of Chemistry & Chemical Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China;3. Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0020, Japan;1. Department of Applied Chemistry and Biotechnology, National Institute of Technology, Niihama College, 7-1, Yagumo-cho, Niihama-shi, Ehime 792-8580, Japan;2. Department of Social Design Engineering, National Institute of Technology, Kochi Collage, Nankoku-shi, Kochi 783-8508, Japan;3. Honda R&D Co., Ltd., Wako-shi, Saitama 351-0193, Japan
Abstract:Boron nitride (BN) material is chemically and thermally stable which makes it desirable for high speed machining in demanding chemical and thermal environments. Although the hardness of BN material is well below that of single polycrystalline diamond (PCD), a laser waterjet heat (LWH) treatment process provides a new potential approach to achieve hardness values that are comparable to diamond hardness. This study investigates the hardness change of LWH-treated bindered cBN/TiN and cBN/AlN composites. Results indicate that measured hardness increase is dependent on the laser beam pass and the distance from the beam center.
Keywords:Bindered boron nitride  Laser heat treatment  Hardness  Fracture toughness  Microstructure
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