【摘要】 采用固相反应法和化学液相共沉淀法合成钡钨阴极电子发射材料铝酸盐。XRD,TG-DSC分析表明:液相共沉淀法最佳合成温度为1100℃,比高温固相反应法的合成温度降低了150℃;产物主晶相为Ba5CaAl4O12;合成的盐制备成阴极,化学液相共沉淀法的脉冲发射电流密度25.3865A/cm2,是固相反应法的2倍;平均蒸散速率为Vevap=5.04×10-8(g·cm-2)·s-1。液相法合成的铝酸盐满足了钡钨阴极的使用要求。更多还原

【Abstract】 The electron emission materials——aluminates have been synthesized by solid-phase reaction and chemistry liquid-phase co-precipitation. The results of XRD and TG-DSC indicate that the optimal synthesis temperature is 1100 ℃, 150 ℃ lower than solid-phase reaction, by chemistry co-precipitation with the crystal phase of Ba5CaAl4O12. The impulse emission current density is 25.3865 A/cm2, and the average evaporation velocity Vevap is 5.04×10-8 (g·cm-2)·s-1. So the aluminates synthesized by chemistry liquid-phase co-precipitation can satisfy the requirement of Ba-W cathodes.更多还原