中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 24 No. 6 June 2014 |
(State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)
Abstract:C/C-ZrC composites were prepared by precursor infiltration and pyrolysis using the organic zirconium as precursor. The conversion mechanisms of the precursors such as the thermal behavior, structural evolution, phase composition, microstructure, composition of the precursors and products were analyzed by thermal gravimetric analyzer, Fourier transform infrared spectrometer, X-ray diffraction and scanning electron microscope. The results indicate that the ZrC precursor transforms to inorganic ZrO2 from room temperature to 1200 °C, then reduces to ZrC at 1600 °C through the carbothermal reduction reaction. The microstructure of the C/C-ZrC composites was also investigated. The composites exhibit an interesting structure, a coating composed of ZrC ceramic covers the exterior of the composite, and the ZrC ceramic is embedded in the pores of the matrix inside the composite.
Key words: ZrC precursor; pyrolysis mechanism; precursor infiltration and pyrolysis; C/C-ZrC composites