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    • 72. 发明授权
    • Glass-ceramic substrate for an information storage medium
    • 用于信息存储介质的玻璃陶瓷衬底
    • US06174827B1
    • 2001-01-16
    • US09267743
    • 1999-03-15
    • Naoyuki GotoJunko IshiokaYasuyuki Kawashima
    • Naoyuki GotoJunko IshiokaYasuyuki Kawashima
    • C03C1004
    • G11B5/7315C03C10/0027C12N2510/00C12N2517/04Y10S428/90
    • A glass-ceramic substrate for an information storage medium includes, as a predominant crystal phase, lithium disilicate (Li2O·2SiO2) or a combination of lithium disilicate and at least one crystal phase selected from the group consisting of &agr;-quartz (&agr;-SiO2), &agr;-quartz solid solution (&agr;-SiO2 solid solution), &agr;-cristobalite (&agr;-SiO2) and &agr;-cristobalite solid solution (&agr;-SiO2 solid solution). This substrate has Young's modulus (GPa)/specific gravity of 37 or over, surface roughness Ra (arithmetic mean roughness) of 5.0 Å or below, a coefficient of thermal expansion within a temperature range from −50° C. to +70° C. which ranges from +65×10−7/° C. to +130×10−7/° C. and bending strength of 400 MPa or over.
    • 用于信息存储介质的玻璃陶瓷基板包括作为主要晶相的二硅酸锂(Li 2 O 2 SiO 2)或二硅酸锂和至少一种选自α-石英(α-SiO 2)的晶相的组合 ),α-石英固溶体(α-SiO 2固溶体),α-方英石(α-SiO 2)和α-方英石固溶体(α-SiO 2固溶体)。 该基板的杨氏模量(GPa)/比重为37以上,表面粗糙度Ra(算术平均粗糙度)为5.0以下,在-50℃〜+ 70℃的温度范围内的热膨胀系数 其范围为+ 65×10 -7 /℃至+ 130×10 -7 /℃,弯曲强度为400MPa或更高。