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Alumina ceramics is widely used as an insulating material for high voltage devices, because of low outgassing, hardness, low dielectric loss and high bulk breakdown voltage. However, there is serious problem to solve that the flashover voltage along the surface in vacuum is lower than that of a vacuum gap at the same length between electrodes. Many intensive researches have been carried out to improve...
Surgical instruments with computerization is demanded to prevent medical error, the burden reduction of the nurse, quality improvement of the operation. In this study, a radio frequency identification tag was made from ceramic was developed. As the results, the sterilization characteristic of repetition was 2% of failure rate. The above-mentioned heating tolerance, the characteristic of ultrasonic...
Secondary electron emission (SEE) coefficients of alumina ceramics with three different surface finishes have been measured using a scanning electron microscope with a single-pulse electron beam (100 pA, 1 ms). SEE coefficients of those aluminas with annealing process became lower after mechanical grinding operations even though its average roughness was almost same as those of as-sintered ones. SEE...
Cubic perovskite-structured platelike SrTiO3 particles were synthesized by topochemical microcrystal conversion (TMC) method from platelike precursor of layer-structured SrBi4Ti4O15 particles. SrTiO3 particles inherited the shape of precursor particles having a thickness of about 0.5 microns and a width of 5-10 microns. X-ray diffraction measurement of cast particles on glass substrate elucidated...
The breakdown of alumina rf windows is mostly caused by multipactor, as well as by material defects and contamination. Since multipator induces localized surface heating, leading to surface melting, it is necessary to observe secondary electron emission (SEE) coefficients of alumina ceramics under high temperature conditions. The SEE coefficients of commercial alumina ceramics and sapphire were measured...
The breakdown of the alumina RF-windows used in high-power klystrons is one of the most serious problems in the development of klystrons. This breakdown results from excess heating of alumina due to multipactor bombardment and/or localized RF dissipation. In order to develop RF windows having high durability for the KEKB klystrons, several kinds of alumina ceramics are being examined, and the breakdown...
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