Fabrication and mechanical properties of Al2O3-SiCw-TiCnp ceramic tool material |
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| Affiliation: | 1. Centre for Advanced Jet Engineering Technologies (CaJET), School of Mechanical Engineering, Shandong University, Jinan 250061, PR China;2. Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Shandong University), Ministry of Education, PR China;3. School of Mechanical and Manufacturing Engineering, The University of New South Wales (UNSW), Sydney, NSW 2052, Australia;1. Centre for Advanced Jet Engineering Technologies (CaJET), School of Mechanical Engineering, Shandong University, Jinan 250061, PR China;2. Key Laboratory of High-efficiency and Clean Mechanical Manufacture, Shandong University, Ministry of Education, Jinan, PR China;1. Advanced Manufacturing Centre, Faculty of Manufacturing Engineering, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, Durian Tunggal Melaka 76100, Malaysia;2. Department of Manufacturing Engineering Technology, Faculty of Mechanical and Manufacturing Engineering Technology, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, Durian Tunggal Melaka 76100, Malaysia;1. School of Mechanical Engineering, Shandong University, Jinan 250061, China;2. School of Mechanical and Automotive Engineering, Qilu University of Technology, Jinan 250353, China;3. Key Laboratory of Advanced Manufacturing and Measurement and Control Technology for Light Industry in Universities of Shandong, Qilu University of Technology, Jinan 250353, China;1. Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;2. Center of Excellence in Nanotechnology, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;1. Department of Mechanical Engineering, National Institute of Technology Silchar, Silchar 788010, India;2. Department of Mechanical Engineering, Osmania University, Hyderabad, Telangana 500007, India;3. Department of Materials Processing & Microsystems Laboratory, CSIR-CMERI, Durgapur 713209, India;4. Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Assam 781039, India;5. Department of Mechanical Engineering, Indian Institute of Technology Tirupati, Andhra Pradesh 517506, India;1. Centre for Advanced Jet Engineering Technologies (CaJET), School of Mechanical Engineering, Shandong University, Jinan, 250061, PR China;2. Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Shandong University, Ministry of Education, PR China;3. National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, PR China |
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| Abstract: | Whiskers and nanoparticles are usually used as reinforcing additives of ceramic composite materials due to the synergistically toughening and strengthening mechanisms. In this paper, the effects of TiC nanoparticle content, particle size and preparation process on the mechanical properties of hot pressed Al2O3-SiCw ceramic tool materials were investigated. The results showed that the Vickers hardness and fracture toughness of the materials increased with the increasing of TiC content. The optimized flexural strength was obtained with TiC content of 4 vol% and particle size of 40 nm. The particle size has been found to have a great influence on flexural strength and small influence on hardness and fracture toughness. It was concluded that the flexural strength increased remarkably with the decreasing of the TiC particle size, which was resulted from the improved density and refined grain size of the composite material due to the dispersion of the smaller TiC particle size. SEM micrographs of fracture surface showed the whiskers to be mainly distributed along the direction perpendicular to the hot-pressing direction. The fracture toughness was improved by whisker crack bridging, crack deflection and whisker pullout; the TiC nanoparticles in Al2O3 grains caused transgranular fracture and crack deflection, which improved the flexural strength and fracture toughness with whiskers synergistically. Uniaxial hot-pressing of SiC whisker reinforced Al2O3 ceramic composites resulted in the anisotropy of whiskers’ distribution, which led to crack propagation differences between lateral crack and radical crack. |
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| Keywords: | Ceramic tool material SiC whisker TiC nanoparticle Particle size Mechanical properties |
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