Abstract
Multiple coatings of La-monazite (LaPO4) were applied to Nextel™ 610 and 720 oxide fibers using a heterogeneous nucleation and growth coating process with phytic acid solution precursors. The as-processed coatings were found to be largely amorphous. Coated fibers were heat treated at 1200°C for 1-2 h, whereupon the coatings crystallized to porous LaPO4 with thin (50-100 nm) layers of AlPO4 at the fiber-coating interface. Heat-treated fibers exhibited full strength retention, in marked contrast to fibers coated by precipitation using citric acid precursors as in a previous work. The microstructural evolution of the amorphous coatings was studied as a function of temperature. AlPO4 forms at the fiber-coating interface between 700° and 800°C, before high-temperature outgassing of the coating as measured by TGA. NMR spectroscopy was used to study as-precipitated powders and as-processed coatings to gain insights into the structural nature of the materials. A possible explanation for the retention of fiber strength through the coating process is proposed and discussed in light of the experimental evidence.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 420-428 |
| Number of pages | 9 |
| Journal | Journal of the American Ceramic Society |
| Volume | 93 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 2010 |
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ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry
Cite this
Precipitation coating of monazite on woven ceramic fibers : III - Coating without strength degradation using a phytic acid precursor. / Fair, Geoff E.; Hay, Randall S.; Boakye, Emmanuel E.; Morgan, Peter E D; Marzke, Robert F.; Sharma, Ramesh.
In: Journal of the American Ceramic Society, Vol. 93, No. 2, 02.2010, p. 420-428.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Precipitation coating of monazite on woven ceramic fibers
T2 - III - Coating without strength degradation using a phytic acid precursor
AU - Fair, Geoff E.
AU - Hay, Randall S.
AU - Boakye, Emmanuel E.
AU - Morgan, Peter E D
AU - Marzke, Robert F.
AU - Sharma, Ramesh
PY - 2010/2
Y1 - 2010/2
N2 - Multiple coatings of La-monazite (LaPO4) were applied to Nextel™ 610 and 720 oxide fibers using a heterogeneous nucleation and growth coating process with phytic acid solution precursors. The as-processed coatings were found to be largely amorphous. Coated fibers were heat treated at 1200°C for 1-2 h, whereupon the coatings crystallized to porous LaPO4 with thin (50-100 nm) layers of AlPO4 at the fiber-coating interface. Heat-treated fibers exhibited full strength retention, in marked contrast to fibers coated by precipitation using citric acid precursors as in a previous work. The microstructural evolution of the amorphous coatings was studied as a function of temperature. AlPO4 forms at the fiber-coating interface between 700° and 800°C, before high-temperature outgassing of the coating as measured by TGA. NMR spectroscopy was used to study as-precipitated powders and as-processed coatings to gain insights into the structural nature of the materials. A possible explanation for the retention of fiber strength through the coating process is proposed and discussed in light of the experimental evidence.
AB - Multiple coatings of La-monazite (LaPO4) were applied to Nextel™ 610 and 720 oxide fibers using a heterogeneous nucleation and growth coating process with phytic acid solution precursors. The as-processed coatings were found to be largely amorphous. Coated fibers were heat treated at 1200°C for 1-2 h, whereupon the coatings crystallized to porous LaPO4 with thin (50-100 nm) layers of AlPO4 at the fiber-coating interface. Heat-treated fibers exhibited full strength retention, in marked contrast to fibers coated by precipitation using citric acid precursors as in a previous work. The microstructural evolution of the amorphous coatings was studied as a function of temperature. AlPO4 forms at the fiber-coating interface between 700° and 800°C, before high-temperature outgassing of the coating as measured by TGA. NMR spectroscopy was used to study as-precipitated powders and as-processed coatings to gain insights into the structural nature of the materials. A possible explanation for the retention of fiber strength through the coating process is proposed and discussed in light of the experimental evidence.
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UR - http://www.scopus.com/inward/citedby.url?scp=76049119702&partnerID=8YFLogxK
U2 - 10.1111/j.1551-2916.2009.03406.x
DO - 10.1111/j.1551-2916.2009.03406.x
M3 - Article
AN - SCOPUS:76049119702
VL - 93
SP - 420
EP - 428
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 2
ER -