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E. I. Suzdal’tsev D. V. Kharitonov A. A. Anashkina 《Refractories and Industrial Ceramics》2010,51(3):202-205
Radioparent materials that exist in the world, that may be used in the production of the radome of high-speed zenith guided
rocket fairings are analyzed. The main physicotechnical indices are provided for these materials and the future for their
application in radome production is indicated. 相似文献
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介绍大型地面雷达天线阵列防护罩所用的材料及其制造工艺。首次采用低压共固化工艺成功地制造了大尺寸的A型夹层结构雷达罩。结果表明,所选用的材料和工艺可行,雷达罩的整体性能和尺寸精度均满足性能指标要求。 相似文献
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An electromagnetically transparent, structurally robust and environmentally resistant enclosure of radar antenna for ground based systems to modern avionics in military aircraft and missiles is called as radome. Radome materials are classified based on: (i) type of function - surface-based or flight-mode and (ii) speed of operation - subsonic, supersonic to hypersonic. The desired properties of these materials are low dielectric constant and low loss factor in addition to its capacity to withstand the high temperature of operation. Composite laminates of glass or aramid fibre reinforced polymeric resins are radome material candidates for applications in subsonic range. However, ceramics are the only viable option for military aerospace applications such as a fighter jet travelling at Mach 3 or an advanced hypersonic missile speeding up to Mach 5. This review outlines the hand-full of ceramic materials already in application as radome materials like high-purity-alumina, pyroceram, slip-cast-fused-silica, their processing technology, electromagnetic and mechanical properties, advantages and disadvantages with respect to advanced military vehicles. Use of silicon nitride based radome materials, that has exceptional mechanical strength and thermal stability up to 1400 °C is illustrated with respect to reaction bonded silicon nitride, hot pressed silicon nitride, silicon oxynitride, sialon and their composites. Design of new generation radome materials was conceptualized and discussed as applicable to silicon nitride and related ceramics, wherein incorporation of varied degree of porosity improves electromagnetic properties, simultaneously, maintaining the required mechanical strength. Multilayer and graded porosity and its influence on electromagnetic properties were briefly discussed. Si3N4 ceramics having controlled porosity leading to optimum electromagnetic and mechanical properties produced through systematic processing is proposed as the futuristic high temperature radome material for supersonic applications. 相似文献
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