【摘要】 工艺温度是影响陶瓷金属化质量的关键因素之一,针对高温氢炉中陶瓷金属化层温度难以实时测量的问题,本文建立氧化铝陶瓷金属化过程的三维流动传热数学模型。模型采用随温度变化的动态材料物性参数,考虑辐射、对流、传导三种传热形式,利用有限体积法求解陶瓷金属化过程中炉内的流动与传热问题,获得陶瓷金属化温度实时变化曲线。瞬态计算结果表明不同位置处最高烧结温度相差26℃,且比金属化工艺设定温度曲线低20~40℃,这为优化氢炉结构、进一步提高炉温均匀性提供参考依据。更多还原

【Abstract】 The 3-D fluid-flow and temperature fields,in the furnace for Mo-covered Al₂O₃ ceramic metallization,were mathematically described with fluidflow heat transfer model theoretically analyzed in fluiddynamics,numerically simulated in finite volume method（FVM）,and experimentally measured.The impact of the realistic situation,including the workpiece’s geometry and position,H₂ flow-rate,temperature-dependent properties of the materials involved,radiation and convection and transfer of heat,on the time-evolution of the fluid-flow and temperature fields was investigated.The simulated results show that the time-evolution of the temperature distribution significantly depends on the H₂ flow-rate,heating time and position.For example,the highest transient spatial sintering temperature-difference was 26℃,and the realistic temperature variation of the three metallization layers were 20⁴0℃ lower than that of the loaded metallizationprofile.The simulated and measured results were in good agreement with a discrepancy below 0.67%.We suggest that the simulated results be of some technological interest in Al₂O₃ ceramic metallization.更多还原