Transparent strengthened glass ceramic having high stress depth, preparation method therefor and application thereof

A transparent strengthened glass ceramic having high stress depth, wherein, a crystal phase of the strengthened glass ceramic comprises spinel crystal and zirconium oxide crystal, and does not comprise a Li-containing crystal;

• and
• the strengthened glass ceramic has a compressive stress zone extending from a surface of the strengthened glass ceramic to a compressive depth, the depth of compressive stress layer DOL_0 of the strengthened glass ceramic is greater than or equal to 14% of the thickness of the strengthened glass ceramic, and the linear density of center tension CT_LD of the strengthened glass ceramic is 25,000 to 40.000 MPa/mm;
• the strengthened glass ceramic comprises a compressive stress layer on the surface and a tensile stress layer inside, and in molar percentage of oxides, the tensile stress layer of the strengthened glass ceramic comprises:
• Li2O:
• 3.50 to 6.00 mol %,
• Na2O:
• 2.00 to 4.00 mol %,
• SiO2:
• 50.00 to 65.00 mol %,
• Al2O3:
• 14.50 to 25.00 mol %,
• MgO:
• 3.50 to 8.00 mol %,
• ZnO:
• 8.00 to 16.00 mol %,
• BaO:
• 0 to 2.00 mol %, and
• TiO2+ZrO2:
• 3.00 to 5.50 mol %;
• and
• in molar percentage of oxides, the tensile stress layer of the strengthened glass ceramic satisfies:
• 0.4
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