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以Sc2O3、Zr(NO3)4·3H2O和NH3·H2O为原料制备出了钪锆陶瓷粉。运用差示/热重(DSC/TG)、X-射线衍射(XRD)、扫描电镜(SEM)等手段,对钪锆陶瓷粉前驱体的热稳定性、相结构、表观状态及脱水动力学参数进行了分析。通过多重速率扫描法记录样品在不同升温速率下的DSC/TG曲线,采用kissinger法对钪锆陶瓷粉前驱体的热分解动力学进行研究。结果表明,钪锆前驱体为无明显晶形,400℃完成脱水反应生成钪锆陶瓷粉,486℃开始晶型转变为立方相,前驱体脱水反应的表观活化能E为99.62 kJ/mol,指前因子A为3.53×107,反应级数为1.2。
Scandium zirconium ceramic powders were prepared from Sc2O3, Zr (NO3) 4 · 3H2O and NH3 · H2O. The thermal stability, phase structure, apparent state and dehydration kinetics of the precursor of scandium zirconate ceramic powder were characterized by DSC / TG, XRD and SEM. The parameters were analyzed. The DSC / TG curves of the sample at different heating rates were recorded by multiple rate scanning. The thermal decomposition kinetics of the precursor of scandium zirconate ceramic powder was studied by Kissinger method. The results show that the precursor of scandium-zirconium is amorphous, and the dehydration reaction at 400 ℃ results in the formation of scandium-zirconium ceramic powder. The crystal form transitions to the cubic phase at 486 ℃. The apparent activation energy E of the dehydration reaction is 99.62 kJ / mol Pre-factor A was 3.53 × 107 and the reaction order was 1.2.