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Alumina ceramics with uniform grains prepared from Al2O3 nanospheres
Sun, Zhiqiang1,2; Li, Baoqiang1,2; Hu, Peng1; Ding, Fei1; Yuan, Fangli1
2016-12-15
发表期刊JOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
卷号688期号:DEC页码:933-938
摘要

Al2O3 nanospheres are employed to synthesize alumina ceramics with uniform grains and superior hardness, and the sintering behaviors of these nanoparticles, including density, grain size and hardness evolution are studied. The results show that the aggregates are avoided during sintering owing to the employment of mono-dispersed spheres. The uniform pores packed by spherical particles can inhibit uneven grain growth effectively, which result in the uniform grains and thus the favorable hardness. The ceramic with 97.6% of theoretical density and 1.1 mu m of average grain size is obtained after sintered at 1550 degrees C, and superior hardness of 23 +/- 1.4 GPa is achieved. Furthermore, the kinetic analysis reveals that surface diffusion is responsible for the mass transport during the initial sintering stage. The higher Ea value than that of irregular powders conforms, on a side-note, the uniform pores are more effective in preventing the merging among grains and are benefit to the homogenization of grains. (C) 2016 Elsevier B.V. All rights reserved.

关键词Spherical Alumina Microstructure Hardness Sintering Kinetics
文章类型Article
WOS标题词Science & Technology ; Physical Sciences ; Technology
DOI10.1016/j.jallcom.2016.07.122
收录类别SCI
语种英语
关键词[WOS]SINTERING BEHAVIOR ; SIZE DISTRIBUTION ; ALPHA-ALUMINA ; SIC WHISKERS ; POWDER ; DENSIFICATION ; STRENGTH ; MICROSTRUCTURE ; TUNGSTEN ; DENSITY
WOS研究方向Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
项目资助者National Natural Science Foundation of China (NSFC)(11535003 ; 11575228)
WOS记录号WOS:000384430800118
引用统计
被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/21616
专题多相复杂系统国家重点实验室
作者单位1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714
Sun, Zhiqiang,Li, Baoqiang,Hu, Peng,et al. Alumina ceramics with uniform grains prepared from Al2O3 nanospheres[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2016,688(DEC):933-938.
APA Sun, Zhiqiang,Li, Baoqiang,Hu, Peng,Ding, Fei,&Yuan, Fangli.(2016).Alumina ceramics with uniform grains prepared from Al2O3 nanospheres.JOURNAL OF ALLOYS AND COMPOUNDS,688(DEC),933-938.
MLA Sun, Zhiqiang,et al."Alumina ceramics with uniform grains prepared from Al2O3 nanospheres".JOURNAL OF ALLOYS AND COMPOUNDS 688.DEC(2016):933-938.
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