Effects of trace Y and Si doping on the microstructure and mechanical properties of MoAlB ceramics
LIU Yakun1,2, JIAN Yongxin1,2, KONG Hanbing1,3, QI Hongjun1, HUANG Guosheng2, HE Peipei1
1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China; 2. State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China; 3. Henan SF Diamond Co., Ltd., Zhengzhou 450048, China
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 Al2O3 phases, 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.
刘亚坤, 坚永鑫, 孔寒冰, 齐泓钧, 黄国胜, 何培培. 微量Y和Si掺杂对MoAlB陶瓷显微组织和力学性能的影响[J]. 粉末冶金材料科学与工程, 2023, 28(4): 329-337.
LIU Yakun, JIAN Yongxin, KONG Hanbing, QI Hongjun, HUANG Guosheng, HE Peipei. Effects of trace Y and Si doping on the microstructure and mechanical properties of MoAlB ceramics. Materials Science and Engineering of Powder Metallurgy, 2023, 28(4): 329-337.
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2023, Vol. 28 
