Surface roughening is an important material surface treatment technique, and it is particularly useful for use in secondary electron yield (SEY) suppression on metal surfaces. Porous structures produced via roughening on coatings have been confirmed to reduce SEY, but the regulation strategy and the influence of process parameters both remain unclear in the practical fabrication of effective porous structures. In this paper, the effect of the surface morphology of porous coatings on the SEY of aluminum alloy substrates was studied. Surface characterization and SEY measurements were carried out for samples with a specific process technique on their surfaces. An exponential fitting model of the correlation between surface roughness and the peak values of SEY curves, δm, was summarized. Furthermore, an implementation strategy to enable low surface SEY was achieved from the analysis of the effect of process parameters on surface morphology formation. This work will aid our understanding of the effect of the irregular surface morphology of porous coatings on SEY, thereby revealing low-cost access to the realization of an easy-to-scale process that enables low SEY.
Abstract. This article introduces a kind of reinforced concrete hollow pillar, the pillar with hollow beam and column composed of reticular cells, each mesh cell in the horizontal direction through the telescopic column connection, in the vertical direction through the internal screw sleeve connection, terminal in the reticular cells in horizontal direction through the elbow connection pipe is connected with the telescopic rod is matched by a positioning pin through, upright positioning hole on the pin connected with the template. The pillar of reticular cells can be combined arbitrarily in the horizontal direction and the vertical direction, the hollow pillar according to the construction size requirements to good combination reticular cells form, with the template will be pouring concrete inside the template, can be installed through the lifting device at the top of the upright post of the whole mechanism to lift the mobile, reduced the construction equipment covers an area of, shorten the building time, easy to move, can complete the construction without support. At the same time, through the contrast calculation, the pillar of compressive bearing capacity calculation formula of good, can be extended.
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