Effect of sodium on the creep resistance of yttrium aluminium garnet (YAG) fibres
UNSPECIFIED. (2006) Effect of sodium on the creep resistance of yttrium aluminium garnet (YAG) fibres. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 26 (9). pp. 1577-1583. ISSN 0955-2219Full text not available from this repository.
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2005.03.2...
Aligned YAG fine fibres had been made previously from an aqueous sol-gel process, but it was suspected that sodium contamination in one of the starting materials lessened the creep resistance of the final product. Therefore, sodium-tree gel precursor fibres were made using the same process, and upon firm(, in air at 900 degrees C these formed pure phase YAG fibres, of 4 mu m diameter. When steamed over 200-500 degrees C for 3 h, the amorphous gel fibre formed single phase nanocrystalline YAG between 400 and 500'C, an extraordinarily low temperature for this material to crystallise. Upon postfiring up to 1550 degrees C, grains averaging 0.5 mu m and pores of 0.17 mu m had formed, but despite this porosity and smaller grain size, the sodium-free fibre exhibited superior creep resistance than the sodium contaminated fibres reported previously by the authors, typically creeping at temperatures 50 degrees C higher. This demonstrates that even small levels of sodium contamination are harmful to creep resistance in YAG. (c) 2005 Elsevier Ltd. All rights reserved.
|Item Type:||Journal Article|
|Subjects:||T Technology > TP Chemical technology|
|Journal or Publication Title:||JOURNAL OF THE EUROPEAN CERAMIC SOCIETY|
|Publisher:||ELSEVIER SCI LTD|
|Number of Pages:||7|
|Page Range:||pp. 1577-1583|
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