Preparation and characterization of Si3N4-based composite ceramic tool materials by microwave sintering |
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| Affiliation: | 1. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China;2. Key Laboratory of High-efficiency and Clean Mechanical Manufacture at Shandong University, Ministry of Education, PR China;3. Collaborative Innovation Center of High-End Equipment Manufacturing Technology (Nanjing University of Science and Technology), Ministry of Industry and Information Technology, PR China;1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing 210009, China;3. Institute 53 of China''s Ordnance Industry, Ji’nan, Shandong 250031, China;1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China;2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;1. Institute of Materials Science and Technology (IMST), University of Miskolc (UM), Miskolc-Egyetemváros, H-3515, Hungary;2. Institute of Materials and Environmental Chemistry (IMEC), Research Centre for Natural Sciences, (RCNS, AKI) Hungarian Academy of Sciences (HAS), Magyar tudósok körútja 2, Budapest H-1117, Hungary;3. Institute of Manufacturing Sciences (IMS), University of Miskolc (UM), Miskolc-Egyetemváros, H-3515, Hungary;4. Institute for Technical Physics and Materials Science, Research Centre for Natural Sciences, (RCNS, ITPMS), Hungarian Academy of Sciences (HAS), Konkoly-Thege Miklós út 29-33, Budapest H-1127, Hungary;1. Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004, PR China;2. Hebei Vocational & Technical College of Building Materials, Qinhuangdao, Hebei 066004, PR China;3. Jingri Diamond Industrial Co., Ltd., Langfang, Hebei 065201, PR China |
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| Abstract: | Si3N4-based composite ceramic tool materials with (W,Ti)C as particle reinforced phase were fabricated by microwave sintering. The effects of the fraction of (W,Ti)C and sintering temperature on the mechanical properties, phase transformation and microstructure of Si3N4-based ceramics were investigated. The frictional characteristics of the microwave sintered Si3N4-based ceramics were also studied. The results showed that the (W,Ti)C would hinder the densification and phase transformation of Si3N4 ceramics, while it enhanced the aspect-ratio of β-Si3N4 which promoted the mechanical properties. The Si3N4-based composite ceramics reinforced by 15 wt% (W,Ti)C sintered at 1600 °C for 10 min by microwave sintering exhibited the optimum mechanical properties. Its relative density, Vickers hardness and fracture toughness were 95.73 ± 0.21%, 15.92 ± 0.09 GPa and 7.01 ± 0.14 MPa m1/2, respectively. Compared to the monolithic Si3N4 ceramics by microwave sintering, the sintering temperature decreased 100 °C，the Vickers hardness and fracture toughness were enhanced by 6.7% and 8.9%, respectively. The friction coefficient and wear rate of the Si3N4/(W,Ti)C sliding against the bearing steel increased initially and then decreased with the increase of the mass fraction of (W,Ti)C., and the friction coefficient and wear rate reached the minimum value while the fraction of (W,Ti)C was 15 wt%. |
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| Keywords: | Microwave sintering Mechanical properties Microstructure Frictional characteristics |
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