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材料导报  2024, Vol. 38 Issue (2): 22040020-5    https://doi.org/10.11896/cldb.22040020
  金属与金属基复合材料 |
金属间化合物MoSi2协同SiC晶须增韧Si3N4陶瓷刀具的制备及切削性能
周后明*, 周金虎, 刘刚, 陈皓月
湘潭大学机械工程学院,湖南 湘潭 411105
Preparation and Cutting Performance of Si3N4 Ceramic Tool Toughened by Intermetallic Compound MoSi2 and SiC Whisker
ZHOU Houming*, ZHOU Jinhu, LIU Gang, CHEN Haoyue
School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, Hunan, China
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摘要 为进一步提高Si3N4陶瓷刀具的强度和韧性,克服单一增韧方式以及金属粘结剂增韧的局限性,本工作利用金属间化合物协同晶须对其增韧补强,将MoSi2颗粒和SiC晶须添加到Si3N4陶瓷基体中,制备出Si3N4/MoSi2/SiCw(SMC)复合陶瓷刀具材料。结果表明:SiC晶须的加入可以有效提高Si3N4陶瓷的断裂韧性,MoSi2的加入可以显著提升Si3N4陶瓷的抗弯强度。连续干切削45#淬火钢时,相较于商用刀具YBC251,SMC复合陶瓷刀具的寿命及切削稳定性提升显著。其中,添加了SiC晶须的SMC3(MoSi2 10%(未作特别说明时均为质量分数),SiCw 10%)及SMC2(MoSi2 0%,SiCw 10%)刀具的寿命均比未添加SiCw的SMC1(MoSi2 10%,SiCw 0%)更长。随着切削深度的增加,未添加MoSi2的SMC2易出现崩刃现象,切削稳定性不如协同增韧的SMC3。
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周后明
周金虎
刘刚
陈皓月
关键词:  陶瓷刀具  协同增韧  切削  力学性能  微观结构    
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.
Key words:  ceramic tool    synergistic toughening    cutting    mechanical property    microstructure
出版日期:  2024-01-25      发布日期:  2024-01-26
ZTFLH:  TG75  
基金资助: 湖南省教育厅项目(21A0117);湖南省自然科学基金(2020JJ4585);国家自然科学基金(51775470; 51775469)
通讯作者:  *周后明,湘潭大学机械工程学院教授、博士研究生导师。2008年于广东工业大学获工学博士学位。主要从事高速加工技术及其工具、刀具与刀具材料方面的研究。发表论文50余篇,包括《中国机械工程》、Ceramics International等。zhouhouming@xtu.edu.cn   
引用本文:    
周后明, 周金虎, 刘刚, 陈皓月. 金属间化合物MoSi2协同SiC晶须增韧Si3N4陶瓷刀具的制备及切削性能[J]. 材料导报, 2024, 38(2): 22040020-5.
ZHOU Houming, ZHOU Jinhu, LIU Gang, CHEN Haoyue. Preparation and Cutting Performance of Si3N4 Ceramic Tool Toughened by Intermetallic Compound MoSi2 and SiC Whisker. Materials Reports, 2024, 38(2): 22040020-5.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.22040020  或          http://www.mater-rep.com/CN/Y2024/V38/I2/22040020
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