Thermal oxidative stability of yttrium containing oligomeric silazanes with organoelement substituents and multiceramics on their basis

Thermal oxidative stability of yttrium containing oligomeric silazanes with organoelement substituents and multiceramics on their basis

Characteristics of thermal transformations of oligomeric silazanes with organoelement substituents at the N atoms (M-OESs) containing one element M = Y, Zr, or Hf or a pair of elements, viz. , Zr and Y or Hf and Y, in air in the temperature range 200–1500 °C were investigated. The introduction of yt...

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Bibliographic Details
Published in:Russian chemical bulletin Vol. 69; no. 8; pp. 1503 - 1510
Main Authors: Ryzhova, O. G., Storozhenko, P. A., Gerasimov, K. N., Timofeev, P. A., Kurishev, A. O., Yakimova, A. Ya, Drachev, A. I., Timofeev, I. A., Kuznetsova, M. G.
Format: Journal Article
Language:English
Published: New York Springer US 01-08-2020
Springer Nature B.V
Subjects:
Ceramics
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
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Hafnium
Heat treatment
Inorganic Chemistry
Loss reduction
Organic Chemistry
Parameter modification
Stability
Synergistic effect
Thermal transformations
Yttrium
Zirconium
oligosilazanes with organoelement substituents
preceramic oligomers
ceramics of the SiCN composition
impregnating compositions
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Summary:Characteristics of thermal transformations of oligomeric silazanes with organoelement substituents at the N atoms (M-OESs) containing one element M = Y, Zr, or Hf or a pair of elements, viz. , Zr and Y or Hf and Y, in air in the temperature range 200–1500 °C were investigated. The introduction of yttrium into zirconium- or hafnium-containing oligosilazanes results in an increase in the mass loss at the stage of ceramization and to a decrease in the mass loss in the formed ceramics during subsequent stepwise heat treatment up to 1500 °C. The combination of yttrium with hafnium or zirconium in M-OESs results in a synergistic effect of overall mass loss reduction. The (Zr, Y)-OES and (Hf, Y)-OES multiceramics outperform ceramics modified with one metal in this parameter. The obtained multiceramics is characterized by high thermo-oxidative stability in the temperature range 1100–1500 °C. It is also found that yttrium-containing oligosilazane (Zr, Y)-OES exhibits oleophilic properties with respect to carbon materials.
ISSN:1066-5285
1573-9171
DOI:10.1007/s11172-020-2929-x