Research on the Large-scale Preparation of Ultrafine LaB6 Powders by Salt-assisted Combustion Synthesis and Its Sintered Properties
AN Ning1, WU Haokai1, ZHU Min2, ZHENG Yuehong1, ZHAN Faqi1, LA Peiqing1,2
1 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China 2 School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Abstract: LaB6 is an excellent cathode material for field emission, with strong anti-radiation and anti-poisoning pollution capabilities. It is widely used in military and high-tech fields such as aerospace, electronic industry, instrumentation and medical equipment. In this work, kilogram-scale LaB6 powders were successfully prepared by the salt-assisted combustion synthesis method. The LaB6 powder was characterized by X-ray diffraction (XRD), cold field emission scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). LaB6 particles adopted the cubic phase with the average particle size of 345—890 nm, and the purity is higher than 99.9%. Then, the LaB6 bulk materials were obtained by spark plasma sintering (SPS) and hot sintering under the same sintering pressure of 35 MPa at different sintering temperatures of 1 600—1 800 ℃ and 1 800—1 900 ℃ respectively. As a result, the sintered materials with relative densities of 93.50% and 95.75% were obtained. The Vickers hardness of the hot pressed sample at 1 900 ℃ was measured to be (14.83±1) GPa by HBRVU-187.5 Brinell Rockwell & Vickers optical hardness tester, and the flexural strength of the sample was calculated to be 137.04 MPa by the three-point bending method.
安宁, 吴浩恺, 朱敏, 郑月红, 占发奇, 喇培清. 盐助燃烧合成法大规模制备超细LaB6粉体及其烧结性能[J]. 材料导报, 2022, 36(11): 21010240-7.
AN Ning, WU Haokai, ZHU Min, ZHENG Yuehong, ZHAN Faqi, LA Peiqing. Research on the Large-scale Preparation of Ultrafine LaB6 Powders by Salt-assisted Combustion Synthesis and Its Sintered Properties. Materials Reports, 2022, 36(11): 21010240-7.
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2022, Vol. 36 
