Premium
Polymer precursor‐derived HfC–SiC ultrahigh‐temperature ceramic nanocomposites
Author(s) -
Cai Tao,
Liu Dan,
Qiu WenFeng,
Han WeiJian,
Zhao Tong
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15192
Subject(s) - carbothermic reaction , materials science , ceramic , polymer , nanocomposite , chemical engineering , phase (matter) , fourier transform infrared spectroscopy , composite material , polymer chemistry , organic chemistry , chemistry , carbide , engineering
Due to poor mechanical properties and antioxidation properties, etc of single phase ultrahigh‐temperature ceramics (UHTCs), the second phase such as SiC was usually introduced for improving those properties. Herein, a novel stratagem for synthesis of binary HfC–SiC ceramics has been presented. A Hf–O–Hf polymer as a HfO 2 precursor has been synthesized for preparing soluble HfC–SiC precursors with high solid content and low viscosity solutions without additional organic solvents. The structure of PHO was characterized by FTIR and 1 H‐NMR, the crystalline behavior and morphologies of polymer‐derived ceramics were identified by XRD, SEM‐EDS, and TEM. It was shown that PHO firstly transformed into HfO 2 , and then reacted with in situ carbon derived from DVB and PCS thus producing cubic HfC through carbothermal reduction. In addition, the obtained HfC–SiC nanopowders exhibited spherical morphology with a diameter less than 100 nm, while the Hf, Si, and C are homogeneously distributed.