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    • 24. 发明公开
    • Method of producing cordierite bodies utilizing substantially reduced firing times
    • Verfahren zur Herstellung von Cordierit-Körpernmit wesentlich verringerten Brandzeiten
    • EP0894777A1
    • 1999-02-03
    • EP98112270.8
    • 1998-07-02
    • CORNING INCORPORATED
    • Cornelius, Edward ElmerMerkel, Gregory Albert
    • C04B35/195B01J21/14
    • C04B38/0006B01J21/14C04B35/195C04B2111/00129C04B2111/00793C04B2111/0081C04B2111/325C04B40/0268
    • A cordierite body is produced by providing cordierite-forming raw materials as talc, calcined talc, MgO-forming component, magnesium aluminate spinel, SiO 2 -forming component, Al 2 O 3 -forming component, kaolin, calcined kaolin, and/or mullite, such that the quantity R is less than about 10.156. R is

      0.140 (wt.% mullite powder)
      +0.433(wt.% SiO 2 powder)
      +0.0781 (wt.% alpha Al 2 O 3 powder)(mean particle size of alpha Al 2 O 3 powder)
      +0.0872 (wt.% Al(OH) 3 powder)(mean particle size of Al(OH) 3 powder)
      +0.00334(wt.% SiO 2 powder)(wt.% spinel powder)
      +2.330 log 10 (1+(wt.% MgO-forming component)(wt.% calcined kaolin))
      -0.244 (wt.% MgO-forming component)
      -0.167 (wt.% dispersible high surface area Al 2 O 3 -forming component)
      +1.1305 (heating time at maximum temperature) -1 .

      The raw materials are intimately blended with effective amount of vehicle and forming aids to impart plastic formability and green strength to the raw materials and form a plastic mixture. A green body is formed which is dried and heated from room temperature up to a maximum temperature of about 1360°C to 1435°C at an average heating rate of at least about 315°C per hour and held at maximum temperature for about 0.05 to 4.4 hours. The total heating time from room temperature to the end of the hold at the maximum temperature is less than about 4.5 hours. The resulting body is predominately cordierite, having a mean coefficient of thermal expansion from about 25°C to 800°C of less than about 15 x 10 -7 °C -1 in at least one direction. In another embodiment, the raw materials are talc, an alumina-forming source, and silica, wherein the mean particle diameter of the talc is less than about 4 micrometers, and that of the alumina--forming source is less than about 2 micrometers.
    • 通过提供堇青石形成原料作为滑石,煅烧滑石,形成MgO的组分,铝酸镁尖晶石,形成SiO 2的组分,Al2O3形成组分,高岭土,煅烧高岭土和/或莫来石,生产堇青石体,使得 数量R小于约10.156。 R为0.140(重量%莫来石粉末)+0.433(重量%SiO 2粉末)+0.0781(重量%Al 2 O 3粉末)(αAl 2 O 3粉末的平均粒度)+0.0872(重量%Al(OH)3粉末 (Al(OH)3粉末的平均粒径)+0.00334(重量%SiO 2粉末)(重量%尖​​晶石粉末)+2.330log10(1+(重量%MgO形成组分)(重量%煅烧高岭土 ))-0.244(重量%MgO形成成分)-0.167(重量%可分散高表面积Al2O3形成组分)+1.1305(最高温度下的加热时间)< - 1>。 将原料与有效量的载体和成型助剂紧密混合,以赋予原料塑性成形性和生坯强度并形成塑料混合物。 形成一个生坯,其干燥并从室温加热至约1360℃至1435℃的最高温度,平均加热速率为至少约315℃/小时,并保持在最高温度下约0.05至 4.4小时。 在最高温度下从室温到保持结束的总加热时间小于约4.5小时。 所得的主体主要是堇青石,在至少一个方向上具有从约25℃至800℃的平均热膨胀系数小于约15×10 -7℃。 在另一个实施方案中,原料是滑石,氧化铝形成源和二氧化硅,其中滑石的平均粒径小于约4微米,氧化铝形成源的平均粒径小于约2微米。