微量Y和Si掺杂对MoAlB陶瓷显微组织和力学性能的影响

doi:10.19976/j.cnki.43-1448/TF.2023024

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Abstract MoB, Al, Y and Si powders were used as raw materials to prepare MoAlB ceramics with trace Y and Si doping by dry milling and vacuum hot pressing methods. The phase composition and microstructure of the sample were characterized and analyzed by X-Ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The hardness, fracture toughness, bending strength and compressive strength of the ceramic were tested to study the effects of different doping elements on the microstructure and comprehensive mechanical properties of MoAlB ceramics. The results show that the MoAlB ceramics are mainly composed of MoAlB, Al₈Mo₃ and Al₂O₃phases, and new phases are produced after doping with trace Si and Y. The doping of Si element can effectively refine the MoAlB grains, while the MoAlB grain size slightly increases after doping with Y element. MoAlB ceramics have good tolerance to damage. The hardness of MoAlB ceramics increases by doping Si and decrease by doping Y. The fracture toughness and bending strength of MoAlB ceramics increase by doping Si, while the bending strength and fracture toughness of ceramics decrease slightly by doping Y. Both Y and Si doping have a positive effect on improving the compressive strength of MoAlB ceramics, and Si doping has a better strengthening effect.

Key words： MoAlB vacuum hot-pressing elemental doping microstructure mechanical property

Received: 20 March 2023 Published: 21 September 2023

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	Articles by authors
	LIU Yakun
	JIAN Yongxin
	KONG Hanbing
	QI Hongjun
	HUANG Guosheng
	HE Peipei

Cite this article:

LIU Yakun,JIAN Yongxin,KONG Hanbing, et al. Effects of trace Y and Si doping on the microstructure and mechanical properties of MoAlB ceramics[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(4): 329-337.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023024 OR http://pmbjb.csu.edu.cn/EN/Y2023/V28/I4/329

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