Alumina ceramics with uniform grains prepared from Al2O3 nanospheres | |
Sun, Zhiqiang1,2; Li, Baoqiang1,2; Hu, Peng1; Ding, Fei1; Yuan, Fangli1 | |
2016-12-15 | |
Source Publication | JOURNAL OF ALLOYS AND COMPOUNDS
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ISSN | 0925-8388 |
Volume | 688Issue:DECPages:933-938 |
Abstract | 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. |
Keyword | Spherical Alumina Microstructure Hardness Sintering Kinetics |
Subtype | Article |
WOS Headings | Science & Technology ; Physical Sciences ; Technology |
DOI | 10.1016/j.jallcom.2016.07.122 |
Indexed By | SCI |
Language | 英语 |
WOS Keyword | SINTERING BEHAVIOR ; SIZE DISTRIBUTION ; ALPHA-ALUMINA ; SIC WHISKERS ; POWDER ; DENSIFICATION ; STRENGTH ; MICROSTRUCTURE ; TUNGSTEN ; DENSITY |
WOS Research Area | Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering |
WOS Subject | Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
Funding Organization | National Natural Science Foundation of China (NSFC)(11535003 ; 11575228) |
WOS ID | WOS:000384430800118 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.ipe.ac.cn/handle/122111/21616 |
Collection | 多相复杂系统国家重点实验室 |
Affiliation | 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 |
Recommended Citation 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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Alumina ceramics wit(1638KB) | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | Application Full Text |
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