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Effect of sodium on the creep resistance of yttrium aluminium garnet (YAG) fibres by R.C. Pullar; M.D. Taylor; A.K. Bhattacharya is a Materials Science article available to read on EtoBox.

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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-free gel precursor fibres were made using the same process, and upon firing in air at 900 • C these formed pure phase YAG fibres, of 4 m diameter. When steamed over 200-500 • 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 • C, grains averaging 0.5 m and pores of 0.17 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 • C higher. This demonstrates that even small levels of sodium contamination are harmful to creep resistance in YAG.

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Author

R.C. Pullar; M.D. Taylor; A.K. Bhattacharya

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0955-2219)

Published

2006

Language

EN

Field

Materials Science (Physical Sciences)