Precipitation coating of monazite on woven ceramic fibers: III - Coating without strength degradation using a phytic acid precursor

Geoff E. Fair, Randall S. Hay, Emmanuel E. Boakye, Peter E D Morgan, Robert F. Marzke, Ramesh Sharma

Research output: Contribution to journalArticle

12 Citations (Scopus)

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 languageEnglish (US)
Pages (from-to)420-428
Number of pages9
JournalJournal of the American Ceramic Society
Volume93
Issue number2
DOIs
StatePublished - Feb 2010

Fingerprint

Monazite
Ceramic fibers
Phytic Acid
Degradation
Coatings
Acids
Fibers
monazite
Degassing
Microstructural evolution
Citric acid
Citric Acid
Powders
Oxides
Nuclear magnetic resonance spectroscopy
Nucleation

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 journalArticle

Fair, Geoff E. ; Hay, Randall S. ; Boakye, Emmanuel E. ; Morgan, Peter E D ; Marzke, Robert F. ; Sharma, Ramesh. / Precipitation coating of monazite on woven ceramic fibers : III - Coating without strength degradation using a phytic acid precursor. In: Journal of the American Ceramic Society. 2010 ; Vol. 93, No. 2. pp. 420-428.
@article{b788e9af80114073974c192f7659f668,
title = "Precipitation coating of monazite on woven ceramic fibers: III - Coating without strength degradation using a phytic acid precursor",
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.",
author = "Fair, {Geoff E.} and Hay, {Randall S.} and Boakye, {Emmanuel E.} and Morgan, {Peter E D} and Marzke, {Robert F.} and Ramesh Sharma",
year = "2010",
month = "2",
doi = "10.1111/j.1551-2916.2009.03406.x",
language = "English (US)",
volume = "93",
pages = "420--428",
journal = "Journal of the American Ceramic Society",
issn = "0002-7820",
publisher = "Wiley-Blackwell",
number = "2",

}

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.

UR - http://www.scopus.com/inward/record.url?scp=76049119702&partnerID=8YFLogxK

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 -