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    • 12. 发明授权
    • Translucent polycrystalline ceramic and method for making same
    • 半透明多晶陶瓷及其制作方法
    • US06417127B1
    • 2002-07-09
    • US09574202
    • 2000-05-19
    • Hiroshi YamamotoTakashi MitsuokaSatoshi Iio
    • Hiroshi YamamotoTakashi MitsuokaSatoshi Iio
    • C04B3510
    • C04B35/115C04B35/6455C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3244C04B2235/3251C04B2235/3272C04B2235/3418C04B2235/5436C04B2235/656C04B2235/77C04B2235/785C04B2235/788C04B2235/96C04B2235/963H01J5/04H01J61/302H01J61/825
    • An translucent polycrystalline ceramic capable of transmitting a visible light and excellent in strength, hardness, abrasion resistance, light transmittance, transparency and high-temperature characteristics and usable as a material, for instance, for cutting tools, outer tubes for high pressure sodium lamps and high temperature furnace window plates. The translucent polycrystalline ceramic has at least one characteristic features that (1) a mean particle size of crystal particles formed inside the ceramic is not larger than 1.0 &mgr;m, (2) a mean aspect ratio thereof is from 1.0 to 1.5, (3) a density thereof is substantially a theoretical density, (4) a light transmittance through its thickness of 1 mm is at least 50%, (5) a mean facet length of crystal particles formed inside the ceramic is not longer than a maximum wave length of the light. One of the embodiments is a translucent polycrystalline Al2O3 ceramic containing 0.02-2.0 mol % of oxide of metal belonging to IIIA and/or IVA group (excluding Ti), having its density of at least 3.98 g/cm3, a mean crystal particle size of 0.3-1.0 &mgr;m, its bending strength of at least 1900 MPa and its Vickers hardness of at least 850 at 1000° C.
    • 能够透过可见光并具有优异的强度,硬度,耐磨性,透光性,透明性和高温特性的半透明多晶陶瓷,可用作切割工具,高压钠灯外管和 高温炉窗板。半透明多晶陶瓷具有至少一个特征,即(1)在陶瓷内形成的晶体颗粒的平均粒径不大于1.0μm,(2)其平均纵横比为1.0〜 1.5,(3)其密度基本上是理论密度,(4)其厚度为1mm的透光率为至少50%,(5)陶瓷内部形成的晶体颗粒的平均面长度不能大于 光的最大波长。实施例中的一个是包含0.02-2.0mol%属于IIIA和/或IVA族的金属的氧化物的半透明多晶Al 2 O 3陶瓷 (不包括Ti),其密度为至少3.98g / cm 3,平均晶粒度为0.3-1.0μm,其弯曲强度为至少1900MPa,维氏硬度在1000℃下为至少850。
    • 19. 发明授权
    • Silicon oxynitride sintered body
    • 氮氧化硅烧结体
    • US5128285A
    • 1992-07-07
    • US335844
    • 1989-04-10
    • Hitoshi YokoiSatoshi IioMasakazu Watanabe
    • Hitoshi YokoiSatoshi IioMasakazu Watanabe
    • C04B35/597C04B35/80
    • C04B35/806C04B35/597
    • Silicon oxynitride sintered body is obtained by sintering a base starting material mixture comprising silicon oxynitride componentand a solution of at least one alkoxide selected from alkoxides of at least one element selected from the group consisting of Al, Sc, Y and rare-earth elements.Fiber-reinforced ceramic sintered body is obtained by sintering the base starting material mixture further inclusing 5-40% by weight of SiC whiskers and/or .beta.-Si.sub.3 N.sub.4 whiskers, wherein alkoxide component is 0.5-30% by weight as oxides.The alkoxide component is deposited on the other material powders and calcined to provide well dispersed oxide layer on the powder surface which forms uniform matrix phase giving high density by sintering. Sintered bodies (with or without whiskers) have low deterioration at high temperatures.
    • 氮氧化硅烧结体是通过将包含氮氧化硅成分的基底原料混合物和至少一种选自Al,Sc,Y和稀土元素中的至少一种元素的醇盐的醇盐的溶液进行烧结而获得的。 纤维增强陶瓷烧结体通过烧结基础原料混合物而获得,其进一步包含5-40重量%的SiC晶须和/或β-Si 3 N 4晶须,其中醇盐组分为氧化物的0.5-30重量%。 将醇盐组分沉积在其他材料粉末上并煅烧,以在粉末表面上提供良好分散的氧化物层,其形成均匀的基质相,通过烧结提供高密度。 烧结体(有或没有晶须)在高温下具有低的劣化。