The strength of SiO2 added MgO ceramics to withstand flashover-treeing appearance under electron bombardment in vacuum

To improve insulating capability of magnesia (MgO) ceramics under electron beam bombardment in vacuum, the addition of SiO2 was studied. A scanning electron microscope (SEM) was used as a source of electron beam and vacuum condition. The capability which was represented by a waiting time to appear the first flashover treeing (hereinafter time to flashover treeing / TTF) changed with adding SiO2 to MgO. It was found that increasing SiO2 additions increased the TTF and got its maximum value for 6 wt% additions. From this study when 6 wt% SiO2 added MgO was used, the insulation property of MgO was significantly increased 5.5 times of withstanding the appearance of first flashover. From three terminals method, it was found that the 6 wt% SiO2 added MgO had the lowest surface conductivity

Novel nuclear technology for controlled production of n-type semiconductor

Use of semiconductors for power electronics requires unique material characteristics because of the high power levels flowing in the devices. In this research, NTD silicon was try to be developed by using Cf-252 isotopic neutron radioactive sourced (1.6 mCi) instead of using neutron source from nuclear reactor. It was found that concentration of P between 0.5 and 14 wt% could be produced by irradiating silicon using netron between 1 and 5 days. It was proved that the irradiation time did not change the mechanical property of the material

Green technology of energy-efficient materials up to 70% for plasma display panel

A plasma display panel (PDP) is a type of flat panel display common to large TV displays (32" inches or larger). Many tiny cells between two panels of glass hold a mixture of noble gases. The gas in the cells is electrically turned into a plasma which then excites phosphors to emit light. One of major part in the plasma display panel is its protecting layer. MgO thin film has been widely used as a protective layer for dielectric materials. An addition material to MgO as base material is an alternative method for improving its property as protective layer. A study of reducing the surface discharge potential of single pure MgO protecting layer by the addition of ZrO2 with several compositions is presented. The discharge properties approach taken is by utilizing the flashover treeing for material characterization, produced by a scanning electron microscope (SEM). From the experiment, ZrO2 addition into high purity MgO has influenced the property of MgO. Since secondary electron emission coefficient contributes in increasing the electric field of the surface, it could be found that 5 wt% ZrO2 added MgO has highest secondary electron emission coefficient because the charging and discharging process happened within a shorter time. Therefore comparing with pure MgO, this new material could increase the efficiency of the energy consumption of a plasma display up to 70%