Patent ID: 6426311
Filing Date: 2002-07-30
Classification: C03C,G11B

Abstract:
Glass-ceramics containing, as a predominant crystal phase or phases, at least one selected from the group consisting of &agr;-cristobalite, &agr;-cristobalite solid solution, &agr;-quartz and &agr;-quartz solid solution, containing substantially no lithium disilicate (Li2OÂ·2SiO2), lithium silicate (Li2OÂ·SiO2), &bgr;-spodumene, &bgr;-eucryptite, &bgr;-quartz, mica or fluorrichterite, containing substantially no Cr ingredient or Mn ingredient, and having average linear thermal expansion coefficient within a range from +65Ã—10âˆ’7/Â° C. to +140Ã—10âˆ’7/Â° C. within a temperature range from âˆ’50Â° C. to +70Â° C., said predominant crystal phase or phases having an average crystal grain diameter of less than 0.10 &mgr;m.