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    • 23. 发明授权
    • Beryllium oxide based ceramics
    • 氧化铍基陶瓷
    • US4981823A
    • 1991-01-01
    • US281919
    • 1988-12-07
    • Michael CrutchleyRonald Stevens
    • Michael CrutchleyRonald Stevens
    • C04B35/08
    • C04B35/08
    • A ceramic article made from a mixture comprising (on a dry weight basis) magnesium oxide (MgO) in an amount up to 2% by weight, a defined rare earth oxide in amount up to 10% by weight, balance beryllium oxide, and trace elements, the defined rare earth oxide being zirconium oxide (ZrO.sub.2), hafnium oxide (HfO.sub.2), cerium oxide (Ce.sub.2 O.sub.3), yttrium oxide (Y.sub.2 O.sub.3), ytterbium oxide (Yb.sub.2 O.sub.3) or thorium oxide (ThO.sub.2). Such ceramic articles have much improved properties in particular higher densities than attainable hitherto and better crossbreak strength and surface smoothness as fired. The ceramic compositions can also be admixed with supplementary ceramic materials such as silicon carbide to produce microwave absorbing materials.
    • 一种由混合物制成的陶瓷制品,其含有至多2重量%的(基于干重的)氧化镁(MgO),至多10重量%的定义的稀土氧化物,平衡氧化铍和痕量 元素,所定义的稀土氧化物是氧化锆(ZrO 2),氧化铪(HfO 2),氧化铈(Ce 2 O 3),氧化钇(Y 2 O 3),氧化镱(Yb 2 O 3)或氧化钍(ThO 2)。 这种陶瓷制品具有特别高的密度,特别是可达到的迄今为止和更好的交叉裂纹强度和烧制时的表面平滑度。 陶瓷组合物也可以与补充陶瓷材料如碳化硅混合以产生微波吸收材料。