TRANSPARENT POLYCRYSTALLINE BODY WITH HIGH ULTRAVIOLET TRANSMITTANCE, PROCESS FOR MAKING AND APPLICATIONS THEREOF

    公开(公告)号:CA1325511C

    公开(公告)日:1993-12-28

    申请号:CA572399

    申请日:1988-07-19

    Abstract: A transparent polycrystalline body having high ultraviolet transmissivity is provided. The body is preferably a sintered magnesia-alumina spinel body having a transmittance of at least 85 percent in the wavelength range from 0.4 microns to 0.8 microns and a transmittance at some wavelength in the wave length range between about 0.2 and about 0.4 microns of at least about 85 percent and a porosity of less than about 0.001 percent. The sintered body is produced by a two-step method comprising forming a closed porosity body from a spinel powder and subjecting the closed porosity body to a hot isostatic pressure treatment. The resulting body has a high transmissivity of electromagnetic radiation in the range between about 0.2 microns and about 6 microns, is resistant to abrasion or erosion, does not substantially deteriorate after exposure to ultraviolet light, and has high strength. The sintered body is useful in a variety of applications, including as a dome and window for missiles and launch tubes.

    Dental appliance and method of manufacture
    15.
    发明公开
    Dental appliance and method of manufacture 失效
    Zahnersatz und Herstellungsverfahren。

    公开(公告)号:EP0030850A1

    公开(公告)日:1981-06-24

    申请号:EP80304485.8

    申请日:1980-12-12

    CPC classification number: A61C13/0003 A61C5/77

    Abstract: A tooth crown or the like dental appliance made of a fired ceramic which undergoes substantially no shrinkage when fired, the appliance being made by forming a compact of the raw pre-fired ceramic with an undersurface shaped for a precise fit onto the prepared tooth on which the appliance is to be used, and thereafter firing the compact to dense, hard monolithic structure.

    Abstract translation: 由烧制陶瓷制成的牙冠或类似的牙科器具,其在烧制时基本上不收缩,该器具通过将原始预烧陶瓷的压块形成为用于精确配合的下表面制成在其上制备的齿上, 使用该器具,然后将该致密体烧成致密,硬的整体结构。

    TRANSPARENT POLYCRYSTALLINE BODY WITH HIGH ULTRAVIOLET TRANSMITTANCE, PROCESS FOR MAKING, AND APPLICATIONS THEREOF
    16.
    发明授权
    TRANSPARENT POLYCRYSTALLINE BODY WITH HIGH ULTRAVIOLET TRANSMITTANCE, PROCESS FOR MAKING, AND APPLICATIONS THEREOF 失效
    具有高紫外透射率的透明多晶体,制造方法及其应用

    公开(公告)号:EP0447390B1

    公开(公告)日:1994-02-02

    申请号:EP88908431.5

    申请日:1988-05-04

    CPC classification number: H01Q1/42 C04B35/443

    Abstract: A transparent polycrystalline body having high ultraviolet transmissivity is provided. The body is preferably a sintered magnesia-alumina spinel body having a transmittance of at least 85 percent in the wavelength range from 0.4 microns to 0.8 microns and a transmittance at some wavelength in the wavelength range between about 0.2 and about 0.4 microns of at least about 86 percent and a porosity of less than about 0.001 percent. The sintered body is produced by a two-step method comprising forming a closed porosity body from a spinel powder and subjecting the closed porosity body to a hot isostatic pressure treatment. The resulting body has high transmissivity of electromagnetic radiation in the range between about 0.2 microns and about 6 microns, is resistant to abrasion or erosion, does not substantially deteriorate after exposure to ultraviolet light, and has high strength. The sintered body is useful in a variety of applications, including as a dome and window for missiles and launch tubes.

    Abstract translation: 提供具有高紫外透射率的透明多晶体。 所述主体优选为烧结的氧化镁 - 氧化铝尖晶石主体,其在0.4微米至0.8微米的波长范围内具有至少85%的透射率,并且在约0.2微米至约0.4微米的波长范围内的一些波长处的透射率为至少约 86%,孔隙率小于约0.001%。 烧结体通过两步法生产,包括由尖晶石粉末形成封闭孔隙体并使封闭孔隙体进行热等静压处理。 所得到的物体具有大约0.2微米至大约6微米范围内的高电磁辐射透射率,耐磨损或侵蚀,在暴露于紫外光后基本上不会劣化,并且具有高强度。 烧结体可用于各种应用,包括导弹和发射管的圆顶和窗口。

    Dental appliance and method of manufacture
    17.
    发明授权
    Dental appliance and method of manufacture 失效
    牙科器具及其制造方法

    公开(公告)号:EP0030850B1

    公开(公告)日:1984-10-31

    申请号:EP80304485.8

    申请日:1980-12-12

    CPC classification number: A61C13/0003 A61C5/77

    Abstract: A tooth crown or the like dental appliance made of a fired ceramic which undergoes substantially no shrinkage when fired, the appliance being made by forming a compact of the raw pre-fired ceramic with an undersurface shaped for a precise fit onto the prepared tooth on which the appliance is to be used, and thereafter firing the compact to dense, hard monolithic structure.

    Abstract translation: 由烧制陶瓷制成的牙冠或类似的牙科器具,其在烧制时基本上不收缩,该器具通过将原始预烧陶瓷的压块形成为用于精确配合的下表面制成在其上制备的齿上, 使用该器具,然后将该致密体烧成致密,硬的整体结构。

    Method for making cast epoxy resin bodies and epoxy formulation therefor
    18.
    发明公开
    Method for making cast epoxy resin bodies and epoxy formulation therefor 失效
    一种用于制备环氧Giessharzgegenständen和为此所用的环氧树脂组合物的方法。

    公开(公告)号:EP0077142A1

    公开(公告)日:1983-04-20

    申请号:EP82305081.0

    申请日:1982-09-27

    Abstract: A method for making cast precision epoxy resin bodies and an epoxy resin formulation for use therein, the epoxy resin formulation having Component A consisting essentially of from 40 to 70% by weight epoxy novolac polymer, from 30 to 50% by weight vinyl -3-cyclohexene diepoxide and from 0 to 20% by weight 3.4 epoxy cyclohexylmethyl -3,4-epoxy cyclohexane carboxylate and Component B consisting essentially of partially hydrolyzed aryl tetracarboxylic acid dianhydride, preferably partially hydrolyzed pyromellitic acid dianhydride. in the preferred embodiments a tertiary amine catalyst is also included. These components are mixed, just before use, in a ratio of from 20 to 50 parts by weight Component B to each 100 parts by weight Component A. To make the cast precision bodies such mixture is cast in a mold of the shape desired, allowed to cure to a solid body while in the mold, and thereafter heated to cause permanent expansion thereof at least sufficient to compensate for any shrinkage occurring during the casting and hardening thereof while in the mold.

    TRANSPARENT POLYCRYSTALLINE BODY WITH HIGH ULTRAVIOLET TRANSMITTANCE, PROCESS FOR MAKING, AND APPLICATIONS THEREOF
    19.
    发明公开
    TRANSPARENT POLYCRYSTALLINE BODY WITH HIGH ULTRAVIOLET TRANSMITTANCE, PROCESS FOR MAKING, AND APPLICATIONS THEREOF 失效
    具有增强的紫外线透射,方法的生产和使用透明多晶硅对象。

    公开(公告)号:EP0447390A1

    公开(公告)日:1991-09-25

    申请号:EP88908431.0

    申请日:1988-05-04

    CPC classification number: H01Q1/42 C04B35/443

    Abstract: Le corps polycristallin ayant un facteur élevé de transmission des ultraviolets est de préférence un corps fritté en spinelle d'alumine-magnésie ayant un facteur de transmission d'au moins 85 % dans la gamme des longueurs d'ondes comprises entre 0,4 et 0,8 microns et un facteur de transmission à certaines longueurs d'ondes dans cette gamme entre 0,2 environ et 0,4 microns environ d'au moins 86 % environ et une porosité inférieure à 0,001 % environ. Le corps fritté est produit par un procédé en deux étapes consistant à former un corps à porosité fermée à partir d'une poudre de spinelle et à soumettre le corps à porosité fermée à un traitement chaud sous pression isostatique. Le corps obtenu possède un facteur de transmission élevé d'un rayonnement électromagnétique dans la plage comprise entre 0,2 microns et 6 microns environ, est résistant à l'abrasion ou à l'érosion, ne se détériore pratiquement pas après avoir été exposé à la lumière ultraviolette, et est très solide. Le corps fritté est utile dans une grande variété d'applications, y compris en temps que dôme et fenêtre pour des missiles et des tubes de lancement.

    CERAMIC MUNITIONS PROJECTILE
    20.
    发明公开
    CERAMIC MUNITIONS PROJECTILE 失效
    陶瓷弹药

    公开(公告)号:EP0324761A1

    公开(公告)日:1989-07-26

    申请号:EP87906247.0

    申请日:1987-08-31

    CPC classification number: F42B8/16 C04B35/486 C04B35/64 F42B12/74

    Abstract: Un projectile pour munitions en céramique (10) est particulièrement utile pour des munitions d'entraînement ou utilisées contre des cibles. Le projectile est constitué de préférence en zircone qui est densifié par un procédé de frittage sans pression. Le projectile possède une résistance suffisante pour supporter les accélérations et les couples engendrés au moment où le projectile est tiré et pendant sa trajectoire.

    Abstract translation: 用于陶瓷弹药的弹丸(10)对训练弹药或用于对付目标特别有用。 抛射体优选由氧化锆制成,其通过烧结工艺而无压力致密化。 抛射体具有足够的强度以承受炮弹射击时和弹道内产生的加速度和扭矩。

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