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    • 39. 发明授权
    • High density leucite based ceramics from zeolite
    • 来自沸石的高密度白云母基陶瓷
    • US5071801A
    • 1991-12-10
    • US557347
    • 1990-07-25
    • Robert L. BedardEdith M. Flanigen
    • Robert L. BedardEdith M. Flanigen
    • B01J20/02B01J29/04C01B25/45C01B37/00C01B39/06C01B39/46C01B39/52C01B39/54C04B35/19C07B61/00C10G45/12C10G47/16C10G47/20C10G49/08
    • C04B35/19
    • This invention relates to processes for preparing ceramic articles. One process involves taking a potassium exchanged zeolite, the zeolite characterized in that it has a SiO.sub.2 /Al.sub.2 O.sub.3 ratio of 3.5 to about 7.5, and calcining it at a temperature of about 900.degree. to about 1100.degree. C. for a time sufficient to collapse the zeolite framework and provide an amorphous powder. Next, the amorphous powder is formed into a shaped article and the article is sintered at a temperature of about 1150.degree. to about 1400.degree. C. for a time of about 0.5 to about 12 hours to give a ceramic article whose principal crystalline phase is tetragonal leucite, is substantially crack free, and has less than 5% porosity. When the zeolite is exchanged with cesium, one obtains a ceramic article whose principal crystalline phase is pollucite, when a rubidium exchanged zeolite is used one obtains a ceramic article whose principal crystalline phase is rubidium leucite, and when a potassium/cesium exchanged zeolite is used one obtains a ceramic article having as its principal crystalline phase a leucite/pollucite solid solution. The addition of pollucite to the leucite article provides a ceramic article whose thermal expansion coefficient can be varied from about 2.times.10.sup.-6 to about 27.times.10.sup.-60 C.sup.-1 as measured over the range 50.degree.-700.degree. C. This invention also relates to this leucite/pollucite ceramic article.
    • 本发明涉及制备陶瓷制品的方法。 一个方法涉及获得钾交换的沸石,该沸石的特征在于其SiO 2 / Al 2 O 3比为3.5至约7.5,并在约900℃至约1100℃的温度下煅烧足够的时间, 沸石骨架,并提供无定形粉末。 接下来,将无定形粉末形成为成型制品,并将制品在约1150℃至约1400℃的温度下烧结约0.5至约12小时,得到其主晶相为四方晶的陶瓷制品 白云母基本上无裂纹,孔隙率小于5%。 当沸石与铯交换时,得到主要结晶相为铯原子的陶瓷制品,当使用铷交换的沸石时,得到主要结晶相为铷白云母的陶瓷制品,并且当使用钾/铯交换的沸石时 得到具有白云母/琉璃灰固体溶液的陶瓷制品的主要结晶相。 将白矾石添加到白云石制品中提供了陶瓷制品,其热膨胀系数可以在50-700℃下测量的约2×10-6至约27×10-60℃-1变化。本发明还涉及这种白云母 /琉璃陶瓷制品。