The subsolidus phase relations of the ternary system Zn O-Mo O3-Bi2O3 have been investigated by X-ray diffraction（XRD） analyses. The phase diagrams have been constructed. There are eight binary compounds and no tern...The subsolidus phase relations of the ternary system Zn O-Mo O3-Bi2O3 have been investigated by X-ray diffraction（XRD） analyses. The phase diagrams have been constructed. There are eight binary compounds and no ternary compound in the Zn O-Mo O3-Bi2O3 system. This system can be divided into nine three-phase regions. From the phase relations of Zn O-MoO 3-Bi2O3 system, the possible component regions for Zn O single crystal flux growth are Zn O-Zn3Mo2O9-Bi2 Mo O6, Zn O-Bi2 Mo O6-Bi26Mo10O69, Zn O-Bi26Mo10O69-Bi14 MoO 24, and Zn O-Bi14 Mo O24-Bi38 Zn O58.展开更多
The effect of ZnO-B2O3（ZB） glass addition on the sintering behavior, microstructures and microwave dielectric properties of BaO-Nd2O3-TiO2-Bi2O3 （BNTB） system was investigated with the aid of X-ray diffraction, sc...The effect of ZnO-B2O3（ZB） glass addition on the sintering behavior, microstructures and microwave dielectric properties of BaO-Nd2O3-TiO2-Bi2O3 （BNTB） system was investigated with the aid of X-ray diffraction, scanning electron microscopy and capacitance meter. It is found that the ZB glass addition, acting as a sintering aid, can effectively lower the sintering temperature of BNTB system to 850 ℃. The dielectric constant of BNTB-ZB ceramics increases with the increase of soaking time and the value of dielectric loss decreased with increasing soak time. The optical dielectric properties at 1 GHz of ε=74, tan δ=4×10^-4, and TCC=25 ppm/℃ were obtained for the BNTB system doped with 25 wt% ZB glass sintered at 850 ℃ for 2 h, representing that the BNTB-ZB ceramics could be promising for multilayer low temperature co-fired ceramics applications.展开更多
Because of the different ways in which contact materials work, the basic requirements for silver metal oxide contact materials are different. They are anti-welded and anti-erosion when closed, anti-erosion when broken...Because of the different ways in which contact materials work, the basic requirements for silver metal oxide contact materials are different. They are anti-welded and anti-erosion when closed, anti-erosion when broken, and arc easily moved and have smaller contact resistance. In this paper, La2O3 is used as a stable oxide in contact material to replace CdO. A new type of Ag/SnO2-La2O3-Bi2O3 contact material is first obtained through using powder metallurgical method. Then electrical contact material parameter tester is used to test the electrical contact performance of the contact material. Through experiments, the arcing voltage and current curves, arcing energy curves, fusion power curves while broken and contact resistance while closed were obtained. Analysis of the results showed that the addition of La2O3 makes the contact material have the following advantages: smaller electrical wear, smaller arc energy, smaller contact resistance and arc is more easily extinguished.展开更多
基金supported by the National Natural Science Foundation of China(61474121,51302262 and 21203198)the Major Research plan of the National Natural Science Foundation of China(No.91333207)the Natural Science Foundation of Fujian Province(2012J05033)
文摘The subsolidus phase relations of the ternary system Zn O-Mo O3-Bi2O3 have been investigated by X-ray diffraction（XRD） analyses. The phase diagrams have been constructed. There are eight binary compounds and no ternary compound in the Zn O-Mo O3-Bi2O3 system. This system can be divided into nine three-phase regions. From the phase relations of Zn O-MoO 3-Bi2O3 system, the possible component regions for Zn O single crystal flux growth are Zn O-Zn3Mo2O9-Bi2 Mo O6, Zn O-Bi2 Mo O6-Bi26Mo10O69, Zn O-Bi26Mo10O69-Bi14 MoO 24, and Zn O-Bi14 Mo O24-Bi38 Zn O58.
基金Funded by the Tianjin Natural Science Foundation of China (No.06YFJMJC01000)
文摘The effect of ZnO-B2O3（ZB） glass addition on the sintering behavior, microstructures and microwave dielectric properties of BaO-Nd2O3-TiO2-Bi2O3 （BNTB） system was investigated with the aid of X-ray diffraction, scanning electron microscopy and capacitance meter. It is found that the ZB glass addition, acting as a sintering aid, can effectively lower the sintering temperature of BNTB system to 850 ℃. The dielectric constant of BNTB-ZB ceramics increases with the increase of soaking time and the value of dielectric loss decreased with increasing soak time. The optical dielectric properties at 1 GHz of ε=74, tan δ=4×10^-4, and TCC=25 ppm/℃ were obtained for the BNTB system doped with 25 wt% ZB glass sintered at 850 ℃ for 2 h, representing that the BNTB-ZB ceramics could be promising for multilayer low temperature co-fired ceramics applications.
基金Project (No. 502048) supported by the Natural Science Foundation of Hebei Province, China
文摘Because of the different ways in which contact materials work, the basic requirements for silver metal oxide contact materials are different. They are anti-welded and anti-erosion when closed, anti-erosion when broken, and arc easily moved and have smaller contact resistance. In this paper, La2O3 is used as a stable oxide in contact material to replace CdO. A new type of Ag/SnO2-La2O3-Bi2O3 contact material is first obtained through using powder metallurgical method. Then electrical contact material parameter tester is used to test the electrical contact performance of the contact material. Through experiments, the arcing voltage and current curves, arcing energy curves, fusion power curves while broken and contact resistance while closed were obtained. Analysis of the results showed that the addition of La2O3 makes the contact material have the following advantages: smaller electrical wear, smaller arc energy, smaller contact resistance and arc is more easily extinguished.
