TY - JOUR
T1 - In situ synthesis mechanism of ZrB2-ZrC-C composites
AU - Liu, Changqing
AU - Li, Kezhi
AU - Li, Hejun
AU - Zhang, Shouyang
AU - Zhang, Yulei
PY - 2014
Y1 - 2014
N2 - In situ ZrB2-ZrC-C composites were synthesized via pyrolysis of a boron and zirconium containing precursor (PBZC), which was prepared by using phenol, paraformaldehyde, boric acid, ZrOCl2·8H2O, and acetylacetone as raw materials. The structure and thermal properties of PBZC were characterized by Fourier transform infrared spectra (FTIR) and thermogravimetry-derivative thermogravimetry (TG-DTG), respectively. The synthesis mechanism of ZrB2-ZrC-C composites was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicate that boron and zirconium are successfully introduced into the polymer. Decomposition of PBZC is completed at about 800 °C with ZrO2, B2O3 and carbon as pyrolysis products. ZrB appears at 1350 °C as an intermediate phase and will transform into ZrB2 at a relatively high temperature. ZrB2 forms at about 1500 °C, followed by the appearance of ZrC when the amount of B2O3 is limited. The ZrB2-ZrC-C composites are hard and dense solids with ZrB2 and ZrC grains uniformly embedding in the carbon matrix.
AB - In situ ZrB2-ZrC-C composites were synthesized via pyrolysis of a boron and zirconium containing precursor (PBZC), which was prepared by using phenol, paraformaldehyde, boric acid, ZrOCl2·8H2O, and acetylacetone as raw materials. The structure and thermal properties of PBZC were characterized by Fourier transform infrared spectra (FTIR) and thermogravimetry-derivative thermogravimetry (TG-DTG), respectively. The synthesis mechanism of ZrB2-ZrC-C composites was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicate that boron and zirconium are successfully introduced into the polymer. Decomposition of PBZC is completed at about 800 °C with ZrO2, B2O3 and carbon as pyrolysis products. ZrB appears at 1350 °C as an intermediate phase and will transform into ZrB2 at a relatively high temperature. ZrB2 forms at about 1500 °C, followed by the appearance of ZrC when the amount of B2O3 is limited. The ZrB2-ZrC-C composites are hard and dense solids with ZrB2 and ZrC grains uniformly embedding in the carbon matrix.
KW - A. Ceramic precursor
KW - Pyrolysis
UR - http://www.scopus.com/inward/record.url?scp=84900413247&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2014.02.122
DO - 10.1016/j.ceramint.2014.02.122
M3 - 文章
AN - SCOPUS:84900413247
SN - 0272-8842
VL - 40
SP - 10297
EP - 10302
JO - Ceramics International
JF - Ceramics International
IS - 7 PART B
ER -