Inorganic composition article and crystallized glass

Abstract

To provide an inorganic composition article containing at least one kind selected from α-cristobalite and α-cristobalite solid solution as a main crystal phase, in which by mass % in terms of oxide, a content of a SiO2 component is 50.0% to 75.0%, a content of a Li2O component is 3.0% to 10.0%, a content of an Al2O3 component is 5.0% or more and less than 15.0%, and a total content of the Al2O3 component and a ZrO2 component is 10.0% or more, and a surface compressive stress value is 600 MPa or more.

What is claimed is: 
     
         1 . An inorganic composition article containing at least one kind selected from α-cristobalite and α-cristobalite solid solution as a main crystal phase, wherein
 by mass % in terms of oxide, 
 a content of a SiO 2  component is 50.0% to 75.0%, 
 a content of a Li 2 O component is 3.0% to 10.0%, 
 a content of an Al 2 O 3  component is 5.0% or more and less than 15.0%, and 
 a total content of the Al 2 O 3  component and a ZrO 2  component is 10.0% or more, and 
 a surface compressive stress value is 600 MPa or more. 
 
     
     
         2 . The inorganic composition article according to  claim 1 , wherein by mass % in terms of oxide,
 a content of a ZrO 2  component is more than 0% and 10.0% or less,   a content of a K 2 O component is 0% to 10.0%, and   a content of a P 2 O 5  component is 0% to 10.0%.   
     
     
         3 . The inorganic composition article according to  claim 1  or  2 , wherein by mass % in terms of oxide,
 a content of a Na 2 O component is 0% to 10.0%, 
 a content of a MgO component is 0% to 10.0%, 
 a content of a CaO component is 0% to 10.0%, 
 a content of a SrO component is 0% to 10.0%, 
 a content of a BaO component is 0% to 10.0%, 
 a content of a ZnO component is 0% to 10.0%, and 
 a content of a Sb 2 O 3  component is 0% to 3.0%. 
 
     
     
         4 . The inorganic composition article according to any one of  claims 1  to  2 , wherein by mass % in terms of oxide,
 a content of a Nb 2 O 5  component is 0% to 10.0%, 
 a content of a Ta 2 O 5  component is 0% to 10.0%, and 
 a content of a TiO 2  component is 0% or more and less than 7.0%. 
 
     
     
         5 . A crystallized glass containing at least one kind selected from α-cristobalite and α-cristobalite solid solution as a main crystal phase, wherein
 by mass % in terms of oxide, 
 a content of a SiO 2  component is 50.0% to 75.0%, 
 a content of a Li 2 O component is 3.0% to 10.0%, 
 a content of an Al 2 O 3  component is 5.0% or more and less than 15.0%, 
 a content of a ZrO 2  component is more than 0% and 10.0% or less, and 
 a total content of the Al 2 O 3  component and the ZrO 2  component is 10.0% or more. 
 
     
     
         6 . The crystallized glass according to  claim 5 , wherein by mass % in terms of oxide,
 a content of a K 2 O component is 0% to 5.0%, and   a content of a P 2 O 5  component is 0% to 10.0%.   
     
     
         7 . The crystallized glass according to  claim 5  or  6 , wherein by mass % in terms of oxide,
 a content of a Na 2 O component is 0% to 4.0%, 
 a content of a MgO component is 0% to 4.0%, 
 a content of a CaO component is 0% to 4.0%, 
 a content of a SrO component is 0% to 4.0%, 
 a content of a BaO component is 0% to 5.0%, 
 a content of a ZnO component is 0% to 10.0%, and 
 a content of a Sb 2 O 3  component is 0% to 3.0%. 
 
     
     
         8 . The crystallized glass according to any one of  claims 5  to  6 , wherein by mass % in terms of oxide,
 a content of a Nb 2 O 5  component is 0% to 5.0%, 
 a content of a Ta 2 O 5  component is 0% to 6.0%, and 
 a content of a TiO 2  component is 0% or more and less than 1.0%.