In this paper,glass fibers were prepared by centrifugal-spinneret-blow(CSB) process.The molten glass got different flow rate from 390 kg/h to 270 kg/h by adjusting the electric current of platinum/10 rhodium alloy bus...In this paper,glass fibers were prepared by centrifugal-spinneret-blow(CSB) process.The molten glass got different flow rate from 390 kg/h to 270 kg/h by adjusting the electric current of platinum/10 rhodium alloy bushing.The diameter and microstructure of glass fibers have been investigated by scanning electron microscopy(SEM) and vertical optical microscope(VOM).The results indicated that the flow rate of molten glass was proportional to the diameter of glass fibers when the molten glass got main flow rate of 330 kg/h.The lower the flow rate was,the finer the average diameter was.展开更多
This paper reports the study of structure of oxide interface in Pt-Rh alloy by atom probe field ion microscope (AP-FIM) which is well suited for the study of atom distribution with atomic scale at the surface and inte...This paper reports the study of structure of oxide interface in Pt-Rh alloy by atom probe field ion microscope (AP-FIM) which is well suited for the study of atom distribution with atomic scale at the surface and interface of alloy. AP depth profiles show that oxide interface exist in the Pt-Rh alloy which consists of PtO, RhO, PtO2 and RhO2. The mechanism of oxidation of the alloy is considered as that first oxygen molecules adsorbed on-to the surface of alloy then dissociate into oxygen atoms (O2&rarr2O). Consequently oxygen atoms diffuse into interior through grain boundary forming oxide (M+O&rarrMO). When the concentration of oxygen continuously increases the dioxide (MO+O&rarrMO2) forms.展开更多
文摘In this paper,glass fibers were prepared by centrifugal-spinneret-blow(CSB) process.The molten glass got different flow rate from 390 kg/h to 270 kg/h by adjusting the electric current of platinum/10 rhodium alloy bushing.The diameter and microstructure of glass fibers have been investigated by scanning electron microscopy(SEM) and vertical optical microscope(VOM).The results indicated that the flow rate of molten glass was proportional to the diameter of glass fibers when the molten glass got main flow rate of 330 kg/h.The lower the flow rate was,the finer the average diameter was.
文摘This paper reports the study of structure of oxide interface in Pt-Rh alloy by atom probe field ion microscope (AP-FIM) which is well suited for the study of atom distribution with atomic scale at the surface and interface of alloy. AP depth profiles show that oxide interface exist in the Pt-Rh alloy which consists of PtO, RhO, PtO2 and RhO2. The mechanism of oxidation of the alloy is considered as that first oxygen molecules adsorbed on-to the surface of alloy then dissociate into oxygen atoms (O2&rarr2O). Consequently oxygen atoms diffuse into interior through grain boundary forming oxide (M+O&rarrMO). When the concentration of oxygen continuously increases the dioxide (MO+O&rarrMO2) forms.
