Synthesis, Characterization and Pyrolysis Behavior of ZrB2/SiC Precursor†

doi:10.7503/cjcu20140152

Abstract

Abstract:

A novel liquid ZrB₂/SiC precursor was prepared by the blend of polyzirconoxane and polyborosilazane, which were used as zirconium, silicon, boron and carbon source. The precursor was transformed into ZrB₂/SiC ceramic during the pyrolysis, and its pyrolytic behavior, phase composition and microstructure were studied by TGA, XRD and SEM-EDX. The results indicated that the ceramic sample remained amorphous until t-ZrO₂ initially generated at 1500 ℃. Heating to 1600 ℃ led to the formation of ZrC via carbothermal reduction. Further heating to 1700 ℃ led to the formation of ZrB₂. During heat treatments, the compact ceramic sample became porous due to formation of CO and NO. The ceramic powder with particle size of 100—300 nm consisted of high crystalline degree ZrB₂ and SiC phases, and all the elements were well distributed in ceramic powders.

Key words: Liquid precursor, Pyrolysis, Carbothermal reduction, ZrB2/SiC multiphase ceramic, Nano particles, Porous structure(Ed.: D, Z)

CLC Number:

O631
TQ343

TrendMD:

GE Kaikai, QIU Wenfeng, HAN Weijian, YE Li, ZHAO Aijun, ZHAO Tong. Synthesis, Characterization and Pyrolysis Behavior of ZrB₂/SiC Precursor^†[J]. Chem. J. Chinese Universities, 2014, 35(9): 2050.

Figures/Tables 7

Fig.1 Proposed structures of PNZ(A) and PBSZ(B)

Fig.2 TGA(a) and DTG(b) curves of ZBS in N2 for 10 ℃/min

Fig.3 FTIR spectra of ZBS(a), ZBS-300(b) and ZBS-600(c)

Fig.4 XRD patterns of PNZ(A), PBSZ(B) and ZBS(C) pyrolyzed at various temperatures

Fig.5 Dependence of ceramic(ZBS) yield on temperature

Fig.6 SEM images of ZBS pyrolyzed at 1500 ℃(A), 1600 ℃(B), 1700 ℃(C) and 2000 ℃(D)

Fig.7 SEM image(A) and distribution(B—F) of elements in ZBS pyrolyzed at 2000 ℃ (B) Zr; (C) Si; (D) B; (E) C; (E) C; (F) N.

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Synthesis, Characterization and Pyrolysis Behavior of ZrB₂/SiC Precursor^†

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