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    • 17. 发明公开
    • HOCHLEISTUNGSGLASKERAMIK UND VERFAHREN ZUR HERSTELLUNG EINER HOCHLEISTUNGSKERAMIK
    • 高效陶瓷及其制备方法高性能陶瓷
    • EP2456729A1
    • 2012-05-30
    • EP10734044.0
    • 2010-07-13
    • Schott AG
    • GABEL, FalkRUDIGIER-VOIGT, EvelineHENN, ChristianLEROUX, RolandSTRENGE, LorenzDUDEK, Roland
    • C03C10/06C03C10/14
    • The invention relates to high-performance glass ceramics and to a method for producing said glass ceramics. A glass or glass ceramic material is used as starting material, which may be a lithium-aluminium silicate (LAS) having a composition within the following limit values in weight %: 60-73 SiO
      2 , 15-25 Al
      2 O
      3 , 2.2-5 Li
      2 O, 0-5 CaO+SrO+BaO, 0-5 TiO
      2 , 0-5 ZrO­
      2 , >0-4 ZnO, 0-3 Sb
      2 O
      3 , >0-3 MgO, 0-3 SnO
      2 , 0-9 P
      2 O
      5 , 0-1.5 As
      2 O
      3 , >0-1 Na
      2 O, >0-0.5 K
      2 O, >0-1.2 Na
      2 O+K
      2 O and 0-1 colouring oxides. The green body is subjected to a thermal treatment for ceramization: room temperature 660°C at a heating rate of > 15 K/min, e.g. within 11 min at 58 K/min; up to about 20 min process time with the slow reduction of the heating rate to zero; 30 min constant at 790°C; heating to maximum temperature (1080-1300°C) at >10 K/min, e.g. 30 K/min; no holding time at maximum temperature; cooling to 400°C at a cooling rate of 15-350 K/min; cooling to room temperature. During tempering the temperature at the workpiece is preferably registered by sensors having a response time of less than 10 s. The kiln regulates the temperature accordingly with a response time of at most 10 s. The LAS glass ceramics produced in this way is characterised in the non-reworked state or processed state
      inter alia by a high impact resistance in the falling ball test of more than 15 cm (e.g. 56 ± 13 cm), an acid resistance according to DIN 12116 of 1 or 2 (e.g. 1) and a resistance to temperature differences (RTD) of more than 700°C. It is suitable as
      inter alia an oven cladding, oven window, stove top, chemically resistant laboratory vessel, white goods, translucent article with UV protection, etc.