Effect of y2o3-al2o3 ratio on inter-granular phases and films in tape-casting alpha-sic with high toughness
文献类型：期刊论文
| 作者 | Huang, R; Gu, H; Zhang, JX; Jiang, DL |
| 刊名 | Acta materialia
 |
| 出版日期 | 2005-05-01 |
| 卷号 | 53期号:8页码:2521-2529 |
| 关键词 | Silicon carbides Meta-stable phases Inter-granular film Wetting and de-wetting Aem |
| ISSN号 | 1359-6454 |
| DOI | 10.1016/j.actamat.2004.10.055 |
| 通讯作者 | Gu, h() |
| 英文摘要 | Silicon carbide (sic) ceramics prepared from liquid phase sintering after aqueous-tape-casting can yield high toughness when appropriate amount of y2o3-al2o3 are added, even though no elongated grains are present. grain boundaries (gb), second-phases and hetero-phase boundaries (hb) in 2 samples with additive mole ratios of 3:5 and 3:7 are investigated using high-resolution and analytical electron microscopy (hrem and aem). the meta-stable yalo3 (yap) was nucleated from sic surfaces in the sample with y/a1 = 3:5 as revealed by crystallographic relations across the hb, whilst relatively thick amorphous films were found at gb. in contrary, the higher level of al2o3 additives decreases the gb film thickness in the sample with y/al = 3:7, and the homogeneous nucleation of y3al5o12 (yag) occurs at triple pockets accompanying with thick hb films. the strong variation of gb widths is a result of gb wetting in the sample with y/al = 3:5 and hb wetting in the sample of y/al = 3:7, both by liquid al2o3. the energy of gb in the former sample is higher than the energy of hb as exhibited by the preferential nucleation of meta-stable yap on sic surfaces, which results in wetting of gb by the liquid; the situation is opposite in the latter sample as the wetting of hb occurs, leading to de-wetting of gb. the thermal mismatch between sic and yap or yag as well as the presence of amorphous films facilitate the creation of micro-crack to promote inter-granular fracture and result in high toughness in both sic ceramics. (c) 2005 acta materialia, inc. published by elsevier ltd. all rights reserved. |
| WOS关键词 | SILICON-CARBIDE CERAMICS ; YTTRIUM-ALUMINUM-GARNET ; GRAIN-BOUNDARY FILMS ; MECHANICAL-PROPERTIES ; MICROSTRUCTURAL DEVELOPMENT ; FRACTURE-TOUGHNESS ; NITRIDE ; ADDITIONS ; BEHAVIOR ; EVOLUTION |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS类目 | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000228818600032 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2377307 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Gu, H |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100864, Peoples R China |
| 推荐引用方式 GB/T 7714 | Huang, R,Gu, H,Zhang, JX,et al. Effect of y2o3-al2o3 ratio on inter-granular phases and films in tape-casting alpha-sic with high toughness[J]. Acta materialia,2005,53(8):2521-2529. |
| APA | Huang, R,Gu, H,Zhang, JX,&Jiang, DL.(2005).Effect of y2o3-al2o3 ratio on inter-granular phases and films in tape-casting alpha-sic with high toughness.Acta materialia,53(8),2521-2529. |
| MLA | Huang, R,et al."Effect of y2o3-al2o3 ratio on inter-granular phases and films in tape-casting alpha-sic with high toughness".Acta materialia 53.8(2005):2521-2529. |
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来源：中国科学院大学
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