TY - JOUR
T1 - Emission characteristics of 411 aluminates in Ba-W cathode
AU - Tang, Zhilan
AU - Shen, Chunying
AU - Li, Zhishun
AU - Qiu, Tai
PY - 2011/6
Y1 - 2011/6
N2 - The 411 aluminate was prepared by high temperature solid phase reaction of a mixture of BaCO3, CaCO3 and Al2O3 powders with the 4:1:1 ratio, for the fabrication of Ba-W cathode. The influence of relative humidity during long time storage on its properties, such as emission characteristics, stability, and impregnation with tungsten sponge, was experimentally studied. The results show that the humidity inversely affects the microstructures, properties and stability of the 411 aluminate. For instance, humidity in air increased its weight by 9%; reduced its impregnation in W-matrix, changed the dominant phase from Ba3CaAl2O7 phase into a mixed phases of Ba3Al2O7, BaCO3, and CaCO3. Worse, the moisture treatment reduced its emission current density of the cathode at 1050°C from 25.86 A·cm-2 to 16.42 A·cm-2, a reduction by 36.5%.
AB - The 411 aluminate was prepared by high temperature solid phase reaction of a mixture of BaCO3, CaCO3 and Al2O3 powders with the 4:1:1 ratio, for the fabrication of Ba-W cathode. The influence of relative humidity during long time storage on its properties, such as emission characteristics, stability, and impregnation with tungsten sponge, was experimentally studied. The results show that the humidity inversely affects the microstructures, properties and stability of the 411 aluminate. For instance, humidity in air increased its weight by 9%; reduced its impregnation in W-matrix, changed the dominant phase from Ba3CaAl2O7 phase into a mixed phases of Ba3Al2O7, BaCO3, and CaCO3. Worse, the moisture treatment reduced its emission current density of the cathode at 1050°C from 25.86 A·cm-2 to 16.42 A·cm-2, a reduction by 36.5%.
KW - 411 aluminate
KW - Ba-W cathode
KW - Electron emission materials
KW - Emission characteristics
UR - http://www.scopus.com/inward/record.url?scp=79959225699&partnerID=8YFLogxK
U2 - 10.3969/j.issn.1672-7126.2011.03.11
DO - 10.3969/j.issn.1672-7126.2011.03.11
M3 - 文章
AN - SCOPUS:79959225699
SN - 1672-7126
VL - 31
SP - 305
EP - 308
JO - Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology
JF - Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology
IS - 3
ER -