ICCAS OpenIR
Effect of pore size distribution of carbon-covered alumina on the preparation of submicrometer alpha-alumina powders
Wang, Pei; Lin, Li; Zhu, Yuexiang; Xie, Youchang
2007-02-01
Source PublicationJOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN0002-7820
Volume90Issue:2Pages:402-406
AbstractCalcining carbon-covered alumina (CCA) samples at 800 degrees C in an oxygen flow is an efficient method to prepare alpha-alumina powders. It is found that the pore size distribution of CCA samples, which depends on the carbon content and the pore size distribution of the precursor alumina used, is one of the key factors for the total conversion of gamma-alumina to alpha-alumina and the complete combustion of carbon in the pores of alumina. No matter how high the carbon content, total conversion does not occur for CCA samples prepared from alumina possessing the most probable pore size of about 5.2 nm. Using gamma-alumina with the most probable pore size of 6.1 nm as the precursor of CCA samples, total transformation occurs when the carbon content of CCA ranges from 11.9 to 17.3 wt%, but the color of as-prepared alpha-alumina is not pure white but light gray. Polyethylene glycol (PEG 20 000), added to the sucrose/gamma-alumina system, can expand the pores of CCA samples after carbonization, and calcining of thus-prepared CCA results in a complete transformation of gamma-alumina to pure white alpha-alumina with a particle size of about 1 mu m when the carbon content of CCA is between 6 and 19 wt%.
DOI10.1111/j.1551-2916.2006.01417.x
Indexed BySCI
Language英语
WOS IDWOS:000243754700009
PublisherBLACKWELL PUBLISHING
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/62692
Collection中国科学院化学研究所
Corresponding AuthorZhu, Yuexiang
AffiliationPeking Univ, Natl Lab Mol Sci, State Key Lab Struct Chem Unstable & Stable Speci, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Wang, Pei,Lin, Li,Zhu, Yuexiang,et al. Effect of pore size distribution of carbon-covered alumina on the preparation of submicrometer alpha-alumina powders[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY,2007,90(2):402-406.
APA Wang, Pei,Lin, Li,Zhu, Yuexiang,&Xie, Youchang.(2007).Effect of pore size distribution of carbon-covered alumina on the preparation of submicrometer alpha-alumina powders.JOURNAL OF THE AMERICAN CERAMIC SOCIETY,90(2),402-406.
MLA Wang, Pei,et al."Effect of pore size distribution of carbon-covered alumina on the preparation of submicrometer alpha-alumina powders".JOURNAL OF THE AMERICAN CERAMIC SOCIETY 90.2(2007):402-406.
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