Degradation of strength properties and its fracture behaviour of TiB2-TiC-based composite ceramic cutting tool materials at the high temperature |
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| Affiliation: | 1. Centre for Advanced Jet Engineering Technologies (CaJET), School of Mechanical Engineering, Shandong University, Jinan 250061, P.R. China;2. Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Shandong University), Ministry of Education, China;3. Shandong Special Equipment Inspection Institute, Jinan 250013, P.R. China;1. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;2. Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15213-3890, USA;3. Zhuzhou Cemented Carbide Cutting Tools Co. Ltd, Zhuzhou 412007, China;1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;1. Shagang Iron and Steel Institute, Soochow University, Jiangsu 215000, China;2. Department of Material and Metallurgy, Northeastern University, Shenyang 110004, China;1. Department of Materials Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran;2. Department of Materials Science and Engineering, University of Tabriz, Tabriz, Iran;3. Chemistry and Chemical Engineering Research Center of Iran, Iran |
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| Abstract: | Strength retention is important for tool materials at high temperature because cutting temperature in machining is ranged from room temperature to 1000 °C. A study examining the strength properties and fracture behaviour of TiB2-TiC-based composite ceramic cutting tool materials is presented at different temperatures. MoSi2 and SiC additives are considered to investigate their effects on the density, microstructure, strength and failure mechanism of composites. It is found that the addition of SiC contributed more to the high-temperature strength of composites than MoSi2, but it did not improve the room-temperature strength, despite grain refinement. The TBAVS8 composite has a flexural strength of 800 MPa at room temperature and can retain 75% at 900 °C. At room temperature, the fracture behaviour of composites was dominated by the strong bonding of the Ni binder phase. At high temperatures, the softer Ni binder phase was pinned, and its sliding was inhibited by SiC particles, which decelerated the strength degradation. |
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