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Pyrolysis synthesis and microstructure of yttrium modified hafnium carbide from polymer precursor.
Pyrolysis synthesis and microstructure of yttrium modified hafnium carbide from polymer precursor.
- Source :
-
Journal of the American Ceramic Society . Dec2024, p1. 10p. 10 Illustrations. - Publication Year :
- 2024
-
Abstract
- In this work, a novel polymer precursor for yttrium modified hafnium carbide (HfC) was prepared by blending polyhafnium carboxane, yttrium acetylacetonate with xylene. The pyrolysis behavior and structural evolution of the precursor were comprehensively investigated, along with a thorough examination of the microstructure and composition of the synthesized HfC particles. The results showed that Y element was introduced into the ceramics to form c‐HfO2, with Hf, Y, C and O elements well distributed. The pyrolysis of the polymer precursor at 1600°C produced HfC nanocrystallites with an average grain size of 43 nm, encapsulated by an amorphous carbon shell. The synthesized HfC ceramics exhibited distinct nanostructures that varied from amorphous structure to almost spherical morphology under different pyrolysis temperatures. The underlying formation mechanisms were also discussed. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ULTRA-high-temperature ceramics
*AMORPHOUS carbon
*HAFNIUM
*YTTRIUM
*GRAIN size
Subjects
Details
- Language :
- English
- ISSN :
- 00027820
- Database :
- Academic Search Index
- Journal :
- Journal of the American Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 181640206
- Full Text :
- https://doi.org/10.1111/jace.20300