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    • 10. 发明公开
    • Method of producing fast-fired cordierite bodies
    • Verfahren zur Herstellung von Cordierit-Körpernmittels Schnellbrand
    • EP0894776A1
    • 1999-02-03
    • EP98112269.0
    • 1998-07-02
    • CORNING INCORPORATED
    • Cornelius, Edward ElmerMerkel, Gregory Albert
    • C04B35/195B01J21/14
    • B01J21/14C04B35/195
    • A cordierite body is produced by providing cordierite-forming raw materials as talc, calcined talc, MgO-forming component, magnesium aluminate spine, 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 1.207. R is

      0.253 (wt.%. mullite powder)
      +0.278(wt.% SiO 2 powder)
      +0.00590(wt.% SiO 2 powder)(wt.% spinel powder)
      -0.0193(wt.% SiO 2 powder)(heating time at maximum temperature)
      -0.348(heating time at maximum temperature)
      -0.00237(mean heating rate from 25°C to 1275°C)
      +0.0736(wt.% alpha Al 2 O 3 powder)(mean particle size of alpha Al 2 O 3 powder)
      +0.0892(wt.% Al(OH) 3 powder)(mean particle size of Al(OH) 3 powder)
      -0.215(wt.% dispersible high surface area Al 2 O 3 -forming component)
      +2.392(log 10 (1+(wt.% MgO-forming component)(wt.% calcined kaolin))). The
      raw materials are intimately blended with effective amount of vehicle and forming aids to 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 70°C per hour and held at maximum temperature for about 0.05 to 18 hours. The total heating time from room temperature to the end of the hold at the maximum temperature is about 4.5 to 20 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 9 x 10 -7 °C -1 in at least one direction.
    • 堇青石体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,铝酸镁骨,SiO 2形成组分,Al 2 O 3形成组分,高岭土,煅烧高岭土和/或莫来石制成, 数量R小于1.207。 R为0.253(重量%莫来石粉末)+0.278(重量%SiO 2粉末)+0.00590(重量%SiO 2粉末)(重量%尖​​晶石粉末)-0.0193(重量%SiO 2粉末)(加热时间最大 温度)-0.348(最高温度下的加热时间)-0.00237(平均加热速度为25℃至1275℃)+0.0736(重量%Al 2 O 3粉末)(αAl 2 O 3粉末的平均粒度)+0.0892(wt。 %Al(OH)3粉末)(Al(OH)3粉末的平均粒径)-0.215(可重结晶的高表面积Al 2 O 3形成组分的重量%)+2.392(log10(1+(重量百分比的MgO形成组分 )(重量%煅烧高岭土)))。 将原料与有效量的载体和成型助剂紧密混合以形成塑料混合物。 形成生坯,将其从室温干燥并加热至最高温度约1360℃至1435℃,平均加热速率为至少约70℃/小时,并保持在最高温度下约0.05 至18小时。 在最高温度下,从室温到保持结束的总加热时间为约4.5至20小时。 所得的主体主要是堇青石,在至少一个方向上具有约25℃至800℃的平均热膨胀系数小于约9×10 -7℃。