Crystalline glass of information recording medium and preparation method and application thereof

Abstract

The invention discloses crystalline glass of an information recording medium as well as a preparation method and application of the crystalline glass of the information recording medium. The high-temperature-resistant glass is prepared from the following components in percentage by weight: 40.0% to 60.0% of SiO2, 0.1% to 5.0% of P2O5, 10.0% to 18.0% of Al2O3, 0.1% to 5.0% of B2O3, 0.1% to 10.0% of Na2CO3, 0.1% to 10.0% of NaNO3, 10.0% to 20.0% of 3MgCO3, 1.0% to 8.0% of TiO2, 0.1% to 8.0% of ZnO, 0.1% to 3.0% of SrO, 0.1% to 3.0% of Y2O3, 0.1% to 3.0% of Gd2O3, 0.1% to 3.0% of Bi2O3, 0.1% to 3.0% of TeO2 and 0.1% to 1.0% of Fe2O3. The present invention relates to a substrate for an information recording medium, the substrate having characteristics of high mechanical strength, heat resistance, and low surface roughness. In addition, the invention also relates to a crystallized glass substrate with physical properties required by the specification of the information recording medium substrate.

Description

Technical Field

[0001] The present invention relates to a crystallized glass, and more particularly to a crystallized glass for information recording medium, a preparation method thereof, and an application thereof, which is used as a substrate for information recording medium, and the substrate has the characteristics of high mechanical strength, heat resistance, and low surface roughness. In addition, it also relates to a crystallized glass substrate having the physical properties required by the specifications of the information recording medium substrate. Background Art

[0002] In recent years, the amount of data processed by personal computers, various electronic devices, and cloud servers has been increasing, and therefore large-capacity information recording devices are required.

[0003] Compared with conventional storage methods, the heat-assisted magnetic recording (HARA: Heat Assisted Magnetic Recording) method enables larger capacity recording. Heat-assisted magnetic recording (HAMR) is a technology that aims to stably write data by reducing the size of the magnetic head and using weaker magnetic flux. When a magnetic material is heated, its magnetic properties decrease, and it can be magnetized even at a weaker magnetic flux density. This technology uses this property to locally heat the area where the data (bit) is written to about 500°C. By using a magnetic head to write in this area, the bit size is miniaturized. The size of the heated area is obviously in the single-digit nanometer level, and as a heating means, a laser that can be focused to an extremely small size by applying optical system technology is automatically selected. Summary of the invention

[0004] The object of the present invention is to provide a crystallized glass for information recording medium and a preparation method and use thereof, so as to overcome the above-mentioned shortcomings and deficiencies existing in the prior art.

[0005] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0006] As a first aspect of the present invention, a crystallized glass for an information recording medium comprises the following components in terms of the mass (mol%) percentage of oxides:

[0007] SiO2 accounts for 40.0% to 60.0%, P2O5 accounts for 0.1% to 5.0%, Al2O3 accounts for 10.0% to 18.0%, B2O3 accounts for 0.1% to 5.0%, Na2CO3 accounts for 0.1% to 10.0%, NaNO3 accounts for 0.1% to 10.0%, 3MgCO3 accounts for 10.0% to 20.0%, TiO2 accounts for 1.0% to 8.0%, ZnO accounts for 0.1% to 8.0%, SrO accounts for 0.1% to 3.0%, Y2O3 accounts for 0.1% to 3.0%, Gd2O3 accounts for 0.1% to 3.0%, Bi2O3 accounts for 0.1% to 3.0%, TeO2 accounts for 0.1% to 3.0%, and Fe2O3 accounts for 0.1% to 1.0%.

[0008] Furthermore, the main crystal phase of the crystallized glass of the information recording medium is gahnite, spinel, calcium aluminum spinel, zinc titanate, magnesium titanate, and spinel solid solution containing one or more components selected therefrom.

[0009] Preferably, the grain diameter of the main crystalline phase is 1-30 nm and the crystallinity is 10-100%.

[0010] As a second aspect of the present invention, a method for preparing a crystallized glass for an information recording medium comprises the following steps:

[0011] S1: uniformly mixing, melting and cooling raw materials to obtain raw glass, wherein the raw materials are composed of the following components in percentage by mass (mol%):

[0012] SiO2 accounts for 40.0% to 60.0%, P2O5 accounts for 0.1% to 5.0%, Al2O3 accounts for 10.0% to 18.0%, B2O3 accounts for 0.1% to 5.0%, Na2CO3 accounts for 0.1% to 10.0%, NaNO3 accounts for 0.1% to 10.0%, 3MgCO3 accounts for 10.0% to 20.0%, TiO2 accounts for 1.0% to 8.0%, ZnO accounts for 0.1% to 8.0%, SrO accounts for 0.1% to 3.0%, Y2O3 accounts for 0.1% to 3.0%, Gd2O3 accounts for 0.1% to 3.0%, Bi2O3 accounts for 0.1% to 3.0%, TeO2 accounts for 0.1% to 3.0%, and Fe2O3 accounts for 0.1% to 1.0%;

[0013] S2: subjecting the original glass to thermal nucleation treatment and crystal growth treatment to obtain crystallized glass.

[0014] Preferably, the mixing is carried out in a stirrer for 5-60 minutes; the melting is carried out in a quartz crucible, a zircon crucible or a platinum crucible at a melting temperature of 1500-1700°C.

[0015] Preferably, the temperature of the thermal nucleation treatment is 500° C. to 850° C., and the time of the thermal nucleation treatment is 30 to 4000 min; the temperature of the crystal growth treatment is 500° C. to 850° C., and the time of the crystal growth treatment is 30 to 1800 min.

[0016] Furthermore, the preparation method also includes:

[0017] S3: Grinding and polishing the crystallized glass;

[0018] S4: Immerse the ground and polished crystallized glass in a salt solution containing potassium or sodium; form a compressive stress layer on the surface layer of the crystallized glass by heat strengthening treatment or ion implantation.

[0019] Preferably, the soaking time is 1 to 720 minutes, preferably 300 to 500 minutes; the temperature of the salt solution is 350° C. to 550° C.; the salt solution may be potassium nitrate or sodium nitrate.

[0020] Preferably, the specific method of heat strengthening treatment is: heating the temperature to 300° C. to 600° C. and then rapidly cooling the glass to form a compressive stress layer caused by the temperature difference between the surface and the interior of the crystallized glass.

[0021] Preferably, the ion implantation method is to use ions to impact the surface of the crystallized glass, with an acceleration energy and an acceleration voltage that do not damage the surface of the crystallized glass, so as to implant the ions into the surface of the crystallized glass to form a compressive stress layer.

[0022] As a third aspect of the present invention, a use of crystallized glass for information recording medium is provided, characterized in that the crystallized glass is used for a substrate of the information recording medium.

[0023] The beneficial effects of the present invention are:

[0024] (1) The crystallized glass of the information recording medium of the present invention contains a predetermined amount of the substrate and has the characteristics of high mechanical strength, heat resistance and low surface roughness.

[0025] (2) The skeleton structure of the crystallized glass of the present invention is:

[0026] SiO 2-Al2O3-ZnO-MgO-TiO2-FeO (P2O5-SrO-Y2O3-Gd2O3-Bi2O3-TeO2), the structure of this model has firmness. On the basis of this skeleton, the crystallized glass contains a specified number of components that increase the compressive stress layer and stress depth, such as Na2CO3 and NaNO3 components, which do not affect the structure of the skeleton after ion exchange and have higher physical strength characteristics. At the same time, since it does not contain any coloring material, it can remain colorless and transparent. In summary, the composition of the present invention produces hard, colorless and transparent crystallized glass.

[0027] (3) The present invention also relates to a crystallized glass substrate having the physical properties required by recent information recording medium substrate specifications.

[0028] The crystallized glass of the present invention contains predetermined amounts of components and has a structure in which a compressive stress layer and stress depth are increased.

[0029] In addition, the compressive stress layer can be chemically strengthened by changing the treatment sequence of the single salt components.

[0030] Therefore, while increasing the surface compressive stress, the central compressive stress can be reduced, thereby enhancing the impact resistance.

[0031] The crystallized glass of the present invention contains predetermined amounts of components and has a structure in which a compressive stress layer and stress depth are increased.

[0032] In addition, the compressive stress layer can be chemically strengthened by using mixed acids or changing the treatment sequence of single salt components.

[0033] Therefore, while increasing the surface compressive stress, the central compressive stress can be reduced, thereby enhancing the impact resistance.

[0034] It is noteworthy that one of the characteristics of the product of the present invention is that it does not require chemical strengthening treatment.

[0035] This property is achieved by adjusting the crystallization temperature and time to reduce the size of the crystal particles while increasing the crystallinity, thereby maintaining transmittance and enhancing impact resistance.

[0036] In other words, even without being strengthened, the crystallized glass of the present invention still has the characteristic of high strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a TEM observation picture of the entire electron diffraction image crystal precipitate of the present invention.

[0038] Figure 2 This is a TEM observation picture of the electron diffraction image monomer crystal precipitate of the present invention.

[0039] Reference numerals: DETAILED DESCRIPTION

[0040] The present invention is further described below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0041] The composition and preparation method of the present invention are further described in detail below in conjunction with specific examples, but the present invention is not limited to the following implementation modes and examples and can be implemented with appropriate changes within the scope of the purpose of the present invention.

[0042] In this specification, the content of each component is expressed in terms of mass mol% of oxide conversion unless otherwise specified. Here, "oxide conversion" means that the amount of each oxide contained in the crystallized glass is expressed in mass % when the total mass of the oxide is set to 100 mass (mol%), assuming that all the constituent components of the crystallized glass are decomposed and changed into oxides. In this specification, 0% means that the content is 0%.

[0043] Example

[0044] The present invention provides a crystallized glass for an information recording medium, which contains the following components in terms of the mass (mol%) percentage of oxides:

[0045] SiO2 accounts for 40.0% to 60.0%, P2O5 accounts for 0.1% to 5.0%, Al2O3 accounts for 10.0% to 18.0%, B2O3 accounts for 0.1% to 5.0%, Na2CO3 accounts for 0.1% to 10.0%, NaNO3 accounts for 0.1% to 10.0%, 3MgCO3 accounts for 10.0% to 20.0%, TiO2 accounts for 1.0% to 8.0%, ZnO accounts for 0.1% to 8.0%, SrO accounts for 0.1% to 3.0%, Y2O3 accounts for 0.1% to 3.0%, Gd2O3 accounts for 0.1% to 3.0%, Bi2O3 accounts for 0.1% to 3.0%, TeO2 accounts for 0.1% to 3.0%, and Fe2O3 accounts for 0.1% to 1.0%.

[0046] SiO2 is a glass-forming component that forms a network structure of glass. On the other hand, if the SiO2 component is insufficient, the resulting glass lacks chemical durability and has poor resistance to devitrification. In the present invention, the upper limit of the content of the SiO2 component is preferably ≤60.0%, more preferably ≤59.0%, further preferably ≤58.0%, and most preferably ≤56.0%; the lower limit of the content of the SiO2 component is ≥40.0%, more preferably ≥42.0%, further preferably ≥43.0%, and most preferably ≥44.0%.

[0047] The content of P2O5 component is ≥0.1%, which is a nucleating agent during glass crystallization and can improve the resistance of glass to devitrification. In particular, reducing the content of P2O5 component to below 5.0% can improve the melting performance of glass and reduce the devitrification tendency of glass. In the present invention, the upper limit of the content of P2O5 component is ≥5.0%, more preferably ≥4.5%, and most preferably ≥4.0%.

[0048] When the content of Al2O3 is ≥10.0%, the viscosity of the glass during melting can be increased, and the chemical durability of the glass can be improved. In particular, when the content of Al2O3 is reduced to ≤18.0%, the melting performance of the glass can be improved and the devitrification tendency of the glass can be weakened. In the present invention, the upper limit of the content of Al2O3 is preferably ≤18.0%, more preferably ≤17.5%, and most preferably ≤17.0%.

[0049] The B2O3 component helps to reduce the viscosity of the glass and improve its solubility and formability. Preferably, the upper limit of B2O3 is ≤5.0% and the lower limit is ≥0.1%.

[0050] Na2CO3 and NaNO3 are involved in ion exchange during the chemical strengthening process. Na2CO3 and NaNO3 are nucleating agents (auxiliary agents) of crystallization precipitation components, exchange substances with the object of ion exchange (K+), have the effect of reducing dissolution viscosity, and prevent dissolution devitrification (devitrification-resistant components); excessive content may deteriorate chemical durability and anti-permeability. In the present invention, the upper limit of Na2CO3 and NaNO3 is ≤10.0%, and the lower limit is ≥0.1%.

[0051] MgO has a function of reducing the viscosity of molten glass when the glass is melted. Preferably, the upper limit of MgO is ≤ 20.0% and the lower limit is ≥ 10.0%.

[0052] TiO2 is a nucleating agent during glass crystallization, and can also improve the strain point of glass and the chemical durability of glass. Preferably, the upper limit of TiO2 is ≤8.0% and the lower limit is ≥1.0%.

[0053] The ZnO component not only helps to improve the Young's modulus of the crystallized glass, but also effectively reduces the viscosity of the glass. Preferably, the upper limit of ZnO is ≤8.0% and the lower limit is ≥0.1%.

[0054] SrO reduces the high temperature viscosity of the glass melt when it coexists with MgO, and has the effect of suppressing devitrification. The upper limit of SrO is ≤3.0%, and the lower limit is ≥0.1%.

[0055] Y2O3 works together with TeO2 to achieve good results. Specifically, the upper limit of Y2O3 is ≤3.0%, and the lower limit is ≥0.1%; the upper limit of TeO2 is ≤3.0%, and the lower limit is ≥0.1%. The above raw material combination within the component range has the effect of improving the strength and elastic modulus of glass.

[0056] Gd2O3 has the effect of reducing devitrification when the glass is melted, and also acts as a nucleation aid. The upper limit of Gd2O3 is ≤3.0%, and the lower limit is ≥0.1%;

[0057] Bi2O3 has the effect of reducing the viscosity of molten glass when the glass is melted and improving the solubility. The upper limit of Bi2O3 is ≤3.0% and the lower limit is 0.1%.

[0058] FeO is a nucleating agent for glass crystallization and is also a clarifying compound. However, excessive content may lead to platinum alloying. The upper limit of FeO is ≤1.0% and the lower limit is 0.1%.

[0059] The crystallized glass skeleton structure of the present invention is:

[0060] SiO 2- Al2O3-ZnO-MgO-TiO2-FeO (P2O5-SrO-Y2O3-Gd2O3-Bi2O3-TeO2), the structure of this model has firmness. On the basis of this skeleton, the crystallized glass contains a specified number of components that increase the compressive stress layer and stress depth, such as Na2CO3 and NaNO3 components, which do not affect the structure of the skeleton after ion exchange and have higher physical strength characteristics. At the same time, since it does not contain any coloring material, it can remain colorless and transparent. In summary, the composition of the present invention produces hard, colorless and transparent crystallized glass.

[0061] In one embodiment: the main crystal phase of the crystallized glass of the information recording medium is zinc spinel, spinel, calcium aluminum spinel, zinc titanate, magnesium titanate, spinel solid solution, the grain diameter of the main crystal phase is 10-30nm, and the crystallinity is 10-100%.

[0062] The present invention also provides a method for preparing crystallized glass for information recording medium, comprising the following steps:

[0063] S1: uniformly mixing, melting and cooling raw materials to obtain raw glass, wherein the raw materials are composed of the following components in percentage by mass (mol%):

[0064] SiO2 accounts for 40.0% to 60.0%, P2O5 accounts for 0.1% to 5.0%, Al2O3 accounts for 10.0% to 18.0%, B2O3 accounts for 0.1% to 5.0%, Na2CO3 accounts for 0.1% to 10.0%, NaNO3 accounts for 0.1% to 10.0%, 3MgCO3 accounts for 10.0% to 20.0%, TiO2 accounts for 1.0% to 8.0%, ZnO accounts for 0.1% to 8.0%, SrO accounts for 0.1% to 3.0%, Y2O3 accounts for 0.1% to 3.0%, Gd2O3 accounts for 0.1% to 3.0%, Bi2O3 accounts for 0.1% to 3.0%, TeO2 accounts for 0.1% to 3.0%, and Fe2O3 accounts for 0.1% to 1.0%;

[0065] In one embodiment, mixing is carried out in a mixer for 5 to 60 minutes at a speed of 1.0 to 30 rpm; melting is carried out in a quartz crucible, a zircon crucible or a platinum crucible at a melting temperature of 1500 to 1700°C for 2 to 72 hours; during cooling and forming, the temperature is lowered to between 1000°C and 1450°C, poured into a mold and slowly cooled to produce the original glass.

[0066] S2: subjecting the original glass to thermal nucleation treatment and crystal growth treatment to obtain crystallized glass;

[0067] In one embodiment, the temperature of the thermal nucleation treatment is 500° C. to 850° C., and the time of the thermal nucleation treatment is 30 to 4000 min; the temperature of the crystal growth treatment is 500° C. to 850° C., and the time of the crystal growth treatment is 30 to 1800 min.

[0068] As a further embodiment of the present invention: the preparation method further comprises S3:

[0069] S3: Grinding and polishing the crystallized glass;

[0070] As a further embodiment of the present invention: the preparation method further comprises S4:

[0071] S4: Immersing the ground and polished crystallized glass in a salt solution containing potassium or sodium;

[0072] In one embodiment: the soaking time is 1 to 720 minutes, preferably 300 to 500 minutes; the temperature of the salt solution is 350° C. to 550° C.; the salt solution may be potassium nitrate (KNO3) or sodium nitrate (NaNO3);

[0073] S4: forming a compressive stress layer on the surface layer of the crystallized glass by heat strengthening treatment or ion implantation;

[0074] In one embodiment: the specific method of heat strengthening treatment is: heating to 300°C ~ 600°C, and then rapidly cooling to form a compressive stress layer caused by the temperature difference between the surface and the inside of the crystallized glass; ion implantation method: using ions to impact the surface of the crystallized glass, so as not to destroy the acceleration energy and acceleration voltage of the crystallized glass surface, thereby implanting ions into the crystallized glass surface to form a compressive stress layer.

[0075] The following experiments are used to demonstrate the beneficial effects of the solution of the present invention. The specific experimental steps are as follows:

[0076] The raw materials are mixed and fed into a platinum crucible, melted in an electric furnace at 1500°C to 1700°C for 2 to 72 hours, and then the molten raw materials are stirred to make them uniform, and then the temperature is reduced to between 1000°C and 1450°C, poured into a mold and slowly cooled to produce raw glass;

[0077] The original glass was subjected to a one-step heat treatment (500-850°C, 5 hours) to nucleate and crystallize to produce crystallized glass; the obtained crystallized glass was analyzed using a 200kV field emission transmission electron microscope FE-TEM (manufactured by JEOL, model JEM2100F). The results showed that precipitated crystals with an average crystal diameter between 10 and 30 nm were observed. Figure 1 This is a TEM observation picture of the entire electron diffraction image crystal precipitate of the present invention. Figure 2 TEM observation diagram of the electron diffraction image monomer crystal precipitate of the present invention. Figure 1 and Figure 2 As shown, further lattice image confirmation of electron diffraction images and EDX analysis confirmed that zinc spinel (ZnAl2O4), spinel (MgAl2O4), calcium aluminum spinel (FeAl2O4), zinc titanate (Zn2TiO4), magnesium titanate (Mg2TiO4), and spinel solid solution (Fe2TiO4) components are the main crystalline phases. Transmission electron microscopy was used to determine the 180×180nm 2 The crystal diameters of the crystal particles in the area are calculated and the average value is calculated.

[0078] The prepared crystallized glass mother material is cut and ground, and face-to-face parallel polishing is performed to obtain a substrate with a thickness of 0.635 mm;

[0079] Crystallized glass is obtained by chemical strengthening after parallel polishing;

[0080] Evaluation and stress measurement of crystallized glass:

[0081] The following physical properties of the obtained crystallized glass were measured. The results are listed in Table 1, including specific gravity (d), surface compressive stress value (CS) and thickness of the compressive stress layer (stress depth DOL).

[0082] For the crystallized glasses of Examples 1 to 15 and Comparative Examples 1 to 2 (wherein the comparative examples are the experimental results of the crystallized glasses obtained using the prior art formula), the crystallized glasses generally obtained meet CS 0.0–1488.8Mpa and DOL 7.3-99.9um to achieve the effect of the present invention, and the surface compressive stress value (CS) and the thickness of the compressive stress layer (stress depth DOL) are measured using the FSM-6000LE series glass surface stress meter manufactured by Orihara Manufacturing Co., Ltd. For the light source of the measuring machine used for CS measurement, a light source with a wavelength of 596nm is selected for measurement. The refractive index value at 596nm is used for CS measurement. The refractive index value at a wavelength of 596nm is calculated from the refractive index measurement values ​​of the C, d, F and g line wavelengths using the second-order approximation method according to the V-block method specified in JIS B7071-2:2018. The central compressive stress value (CT) is determined by curve analysis.

[0083] It is noteworthy that one of the characteristics of the product of the present invention is that it does not require chemical strengthening treatment.

[0084] This property is achieved by adjusting the crystallization temperature and time to reduce the size of the crystal particles while increasing the crystallinity, thereby maintaining transmittance and enhancing impact resistance.

[0085] In other words, even without being strengthened, the crystallized glass of the present invention still has the characteristic of high strength.

[0086] It can be concluded from the above table that the crystallized glass substrate obtained by the scheme of the present invention has the characteristics of high mechanical strength, heat resistance and low surface roughness. In addition, it also relates to a crystallized glass substrate having the physical properties required by the specifications of information recording medium substrates in recent years.

[0087] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. The protection scope of the present invention shall be subject to the protection scope of the claims. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention, as long as it does not depart from the purpose of the present invention, the present invention can also have various changes, which still belong to the scope of the technical solution of the present invention.

[0088] Table 1 Composition and physical properties of crystallized glass

[0089]

Claims

1. A crystallized glass for an information recording medium, comprising the following components in terms of the mass (mol%) percentage of oxides: SiO2 accounts for 40.0% to 60.0%, P2O5 accounts for 0.1% to 5.0%, Al2O3 accounts for 10.0% to 18.0%, B2O3 accounts for 0.1% to 5.0%, Na2CO3 accounts for 0.1% to 10.0%, NaNO3 accounts for 0.1% to 10.0%, 3MgCO3 accounts for 10.0% to 20.0%, TiO2 accounts for 1.0% to 8.0%, ZnO accounts for 0.1% to 8.0%, SrO accounts for 0.1% to 3.0%, Y2O3 accounts for 0.1% to 3.0%, Gd2O3 accounts for 0.1% to 3.0%, Bi2O3 accounts for 0.1% to 3.0%, TeO2 accounts for 0.1% to 3.0%, and Fe2O3 accounts for 0.1% to 1.0%.

2. The crystallized glass for information recording medium according to claim 1, characterized in that: The main crystal phase of the crystallized glass is one or more components selected from zinc spinel, spinel, calcium aluminum spinel, zinc titanate, magnesium titanate, and spinel solid solution.

3. The crystallized glass for information recording medium according to claim 1, wherein: The main crystalline phase has a grain diameter of 1-30 nm and a crystallinity of 10-100%.

4. A method for preparing crystallized glass for information recording medium, characterized in that: The following steps are involved: S1: uniformly mixing, melting and cooling raw materials to obtain raw glass, wherein the raw materials are composed of the following components in percentage by mass (mol%): SiO2 accounts for 40.0% to 60.0%, P2O5 accounts for 0.1% to 5.0%, Al2O3 accounts for 10.0% to 18.0%, B2O3 accounts for 0.1% to 5.0%, Na2CO3 accounts for 0.1% to 10.0%, NaNO3 accounts for 0.1% to 10.0%, 3MgCO3 accounts for 10.0% to 20.0%, TiO2 accounts for 1.0% to 8.0%, ZnO accounts for 0.1% to 8.0%, SrO accounts for 0.1% to 3.0%, Y2O3 accounts for 0.1% to 3.0%, Gd2O3 accounts for 0.1% to 3.0%, Bi2O3 accounts for 0.1% to 3.0%, TeO2 accounts for 0.1% to 3.0%, and Fe2O3 accounts for 0.1% to 1.0%; S2: subjecting the original glass to thermal nucleation treatment and crystal growth treatment to obtain crystallized glass.

5. The method for preparing a crystallized glass for an information recording medium according to claim 4, characterized in that: In step S1, the mixing is carried out in a stirrer for 5 to 60 minutes at a stirring speed of 1.0 to 30 rpm; a quartz crucible, a zircon crucible or a platinum crucible is used for melting at a temperature of 1500 to 1700°C for 2 to 72 hours; during cooling and molding, the temperature is lowered to between 1000°C and 1450°C, poured into a mold and slowly cooled to produce the original glass.

6. The method for preparing a crystallized glass for an information recording medium according to claim 4, characterized in that: In step S2, the temperature of the thermal nucleation treatment is 500°C to 850°C, and the time of the thermal nucleation treatment is 30 to 4000 min; the temperature of the crystal growth treatment is 500°C to 850°C, and the time of the crystal growth treatment is 30 to 1800 min.

7. The method for preparing a crystallized glass for an information recording medium according to claim 4, characterized in that: Also includes, S3: Grinding and polishing the crystallized glass; S4: Immerse the ground and polished crystallized glass in a salt solution containing potassium or sodium; form a compressive stress layer on the surface layer of the crystallized glass by heat strengthening treatment or ion implantation.

8. The method for preparing a crystallized glass for an information recording medium according to claim 7, characterized in that: In step S4, the soaking time is 1 to 720 minutes; the temperature of the salt solution is 350° C. to 550° C.; the salt solution can be potassium nitrate or sodium nitrate.

9. The method for preparing a crystallized glass for an information recording medium according to claim 7, characterized in that: In step S4, the specific method of heat strengthening treatment is: after heating the temperature to 300°C to 600°C, rapid cooling is performed to form a compressive stress layer generated by the temperature difference between the surface and the interior of the crystallized glass.

10. The method for preparing crystallized glass for information recording medium according to claim 7, characterized in that: In step S4, the ion implantation method is to use ions to impact the surface of the crystallized glass with an acceleration energy and an acceleration voltage that do not damage the surface of the crystallized glass, thereby implanting the ions into the surface of the crystallized glass to form a compressive stress layer.

11. The use of the crystallized glass for information recording medium according to claim 1, characterized in that: The crystallized glass is used for a substrate of an information recording medium.

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