| METALS AND METAL MATRIX COMPOSITES |
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| Preparation and Cutting Performance of Si3N4 Ceramic Tool Toughened by Intermetallic Compound MoSi2 and SiC Whisker |
| ZHOU Houming*, ZHOU Jinhu, LIU Gang, CHEN Haoyue
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| School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, Hunan, China |
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Abstract In order to further improve the strength and toughness of Si3N4 ceramic tool, overcome the limitations of single toughening method and metal binder toughening, MoSi2 particles and SiC whiskers were added to the Si3N4 ceramic matrix to prepare Si3N4/MoSi2/SiCw (SMC) compo-site ceramic tool material by toughening and reinforcing them with intermetallic compounds and whiskers. The results show that the addition of SiC whisker can effectively improve the fracture toughness of Si3N4 ceramics, and the addition of MoSi2 can significantly improve the bending strength of Si3N4 ceramics. In continuous dry cutting of 45# quenched steel, the tool life and cutting reliability of SMC composite ceramic tool are significantly improved compared with commercial tool YBC251. Among them, the tool life of SMC3 (MoSi2 10wt%, SiCw 10wt%) and SMC2 (MoSi2 0wt%, SiCw 10wt%) with SiC whisker is better than that of SMC1 (MoSi2 10wt%, SiCw 0wt%) without SiCw. With the increase of cutting depth, SMC2 without MoSi2 is prone to chipping, and the cutting reliability is not as good as SMC3 with synergistic toughening.
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Published: 25 January 2024
Online: 2024-01-26
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| Fund:Hunan Provincial Department of Education Project (21A0117), Hunan Provincial Natural Science Foundation (2020JJ4585), National Natural Science Foundation of China (51775470, 51775469). |
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2024, Vol. 38 
