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以锆英石、氧化硼和活性炭为原料,通过硼热/碳热还原合成工艺制备Zr B2-Si C复合粉体。用X射线衍射、场发射扫描电子显微镜和透射电子显微镜研究了Zr B2-Si C复合粉体的物相组成和显微结构。用综合热分析仪研究Zr B2-Si C复合粉体的氧化动力学。结果表明:以锆英石为原料,采用硼热/碳热还原反应工艺,1 500℃反应3 h,合成出纯相Zr B2-Si C复合粉体;复合粉体中,Zr B2呈柱状或颗粒状,Si C则呈晶须状。采用Kissinger法和Ozawa法,计算了Zr B2和Si C的表观活化能,其数值分别为369和211 k J/mol。
ZrB2-SiC composite powder was prepared by boron-thermal / carbothermal reduction synthesis using zircon, boron oxide and activated carbon as raw materials. The phase composition and microstructure of Zr B2-Si C composite powders were investigated by X-ray diffraction, field emission scanning electron microscopy and transmission electron microscopy. Study on Oxidation Kinetics of Zr B2-Si C Composite Powder by Comprehensive Thermal Analyzer. The results show that ZrB2-SiC composite powder is synthesized from zirconite by boron hot-carbothermal reduction reaction at 1500 ℃ for 3 h. In the composite powder, Zr B2 is cylindrical or Granular, Si C was whisker-like. The apparent activation energies of Zr B2 and Si C were calculated by Kissinger method and Ozawa method, and their values were 369 and 211 kJ / mol, respectively.