Synthesis of ZrO2-Nitride Composite Powder and Effect of Its Addition on Properties of Low Carbon Al2O3-C Refractories
Using zircon and activated carbon as raw materials,ZrO2-nitride composite powder was synthesized by carbothermal reduction and nitridation (CRN) in nitrogen atmosphere.The effect of ZrO2-nitride composite powder addition on thermal shock resistance (TSR) and oxidation resistance of the Al2O3-C refractories was compared by residual CMOR ratio after 1100℃-air quenching and the thickness of oxidation layer respectively.Phase compositions and microstructure of the Al2O3-C refractories were investigated by X-ray diffraction (XRD) and scanning electronic microscope (SEM) fitted with an energy-dispersive spectroscopy (EDS) analyzer.XRD results of ZrO2-nitride composite powder showed that the relative content of ZrO2 and nitride reach about 30% and 70%,respectively.The mainly phases of the nitride are:Zr7O8N4(30%),Si2N2O (20-30%),besides of them,some of ZrN(5%) and β-Si3N4(3%) were also obtained.TSR and oxidation resistance of Al2O3-C refractories can be improved obviously by the addition of the synthesized ZrO2-nitride composite powder.
YU Renhong ZHANG Feifei ZHOU Ningsheng ZHANG MengMeng
High Temperature Materials Institute, Henan University of Science and Technology, Luoyang, China
国际会议
The 6th International Symposium on Refractories (第六届国际耐火材料会议)
郑州
英文
280-283
2012-10-18（万方平台首次上网日期，不代表论文的发表时间）