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Research Article | Open Access

Microwave synthesis of duplex α/β-SiAlON ceramic cutting inserts: Modifying m, n, z values, synthesis temperature, and excess Y2O3 synthesis additive

Dongbo HONGa,bZengbin YINa,b( )Fuzhou GUOa,bJuntang YUANa,b
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Collaborative Innovation Center of High-End Equipment Manufacturing Technology, Nanjing University of Science and Technology, Ministry of Industry and Information Technology, Nanjing 210094, China
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Graphical Abstract


Duplex α/β-SiAlON ceramic cutting inserts (30α:70β) were synthesized by microwave sintering. The effects of solid solution parameters (m, n, z), synthesis temperature, and amount of excess Y2O3 synthesis additive on phase assemblage, microstructure, mechanical properties, and cutting performance were systematically investigated. It was found that increasing m value could improve the formation of α phase while high z value over 1.0 resulted in the dissolution of α phase into β phase and intergranular phase. Increasing the amount of excess Y2O3 could promote densification and elongated β grain growth; however, the excess Y2O3 amount above 4 wt% resulted in substantial crystallization of M'SS phase, thus declining the mechanical properties and wear resistance. The microwave-synthesized α/β-SiAlON cutting insert with modified parameters (m = 1.7, n = 1.0, z = 0.7, and 3 wt% excess Y2O3) was obtained with optimal comprehensive properties, whose tool life was found to increase by approximately 75% in high-speed milling of Inconel 718 superalloy compared to the commercial α/β-SiAlON cutting insert.


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Journal of Advanced Ceramics
Pages 589-602
Cite this article:
HONG D, YIN Z, GUO F, et al. Microwave synthesis of duplex α/β-SiAlON ceramic cutting inserts: Modifying m, n, z values, synthesis temperature, and excess Y2O3 synthesis additive. Journal of Advanced Ceramics, 2022, 11(4): 589-602.








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Received: 09 May 2021
Revised: 31 October 2021
Accepted: 03 December 2021
Published: 17 March 2022
© The Author(s) 2021.

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