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    • 95. 发明授权
    • Process for manufacturing high density slip-cast fused silica bodies
    • 制造高密度滑移熔融石英体的方法
    • US08795581B2
    • 2014-08-05
    • US13116643
    • 2011-05-26
    • Andi U. KumarSelvaraj S. Kumar
    • Andi U. KumarSelvaraj S. Kumar
    • C04B33/28
    • C04B35/14C04B35/6261C04B35/6263C04B35/62665C04B2235/3201C04B2235/3206C04B2235/3208C04B2235/3217C04B2235/3272C04B2235/3409C04B2235/5436C04B2235/6027C04B2235/72C04B2235/77
    • Fused silica ceramics plays demanding role in high velocity missile/aircraft'radome development. Slip casting is the most common and commercially viable process utilized for radome production. Unfortunately slip casting cannot afford high density due to its poor green packing density which in turn results in poor rain erosion resistance. Present invention discloses process for preparing high density fused silica bodies by adding boron oxide (B2O3) with the commercially available high purity fused silica as sintering aid cum de-vitrification inhibitor. Various concentrations of B2O3 were added to high purity fused silica. Thus formed compositions were made into slip-castable slurries in aqueous medium without any addition of dispersing agents. The reheological properties like mild shear thinning and low thixotropic behaviour of the slurries were established. These slurries were then slip-casted in plaster of parries mold. The green and sintered properties of the casted samples were studied. The sintered sample with density higher than 2 g/cc (90-95% of the theoretical density) was achieved without de-vitrification. XRD studies on sintered samples showed the amorphous nature of the sample. The improved properties of fused silica system can favor its utilization in radome applications.
    • 熔融二氧化硅陶瓷在高速导弹/飞机的发展中起着重要作用。 滑动铸造是用于天线罩生产的最常见和商业上可行的过程。 不幸的是,由于其较差的绿色堆积密度导致耐雨水侵蚀性差,因此滑移铸造不能承受高密度。 本发明公开了通过将市售的高纯度熔融石英作为烧结助剂和脱玻璃化抑制剂添加氧化硼(B2O3)来制备高密度熔融石英体的方法。 将各种浓度的B2O3加入到高纯度熔融石英中。 如此形成的组合物在水性介质中制成可滑移浇注的浆料,而不加任何分散剂。 确定了浆料的轻度剪切稀化和低触变行为的流变性能。 然后将这些浆料用石膏模具浇注。 研究了铸造样品的绿色和烧结性能。 密度高于2g / cc(理论密度的90-95%)的烧结样品在没有脱玻璃化的情况下实现。 烧结样品的XRD研究显示样品的无定形性质。 熔融石英系统的改进性能有利于其在天线罩应用中的应用。