KR101738599B1 - Aluminosilicate glass and method for manufacturing the same - Google Patents

Abstract

The present invention discloses an alkali aluminosilicate glass which is light and has good processability and is suitable for chemical strengthening treatment, and a method for producing the same. A glass according to one aspect of the present invention is an alkali aluminosilicate glass which comprises 73 to 78% of SiO ₂ , 1 to 6% of Al ₂ O ₃ , 10 to 14% of Na ₂ O, and ZnO 7 To 13%.

Description

[0001] Aluminosilicate glass and method for manufacturing same [0002]

TECHNICAL FIELD The present invention relates to a glass manufacturing technique, and more particularly, to an alkali aluminosilicate glass composition and a method for producing such a glass.

Among them, flat glass is used in various fields such as window glass, window screen of a vehicle, mirror, and the like, and the kind thereof is also developed and used in various ways to suit the application.

Glass may be required to have a variety of properties depending on the equipment, equipment, and location to which it is applied. Among them, the mechanical strength of glass is one of the characteristics that has recently become important. Since the glass has characteristics that are fragile due to its characteristics, the improvement of the mechanical strength of the glass is a very important factor in improving the usability of the glass.

Furthermore, in recent years, display devices such as mobile phones, portable computers, digital cameras, and PDAs such as smart phones have become widespread, and glass can also be used for such display devices. In particular, a touch panel is often applied to such a display device. Cover glass is commonly used for a display device to which such a touch panel is applied.

The cover glass is also called a protective glass, and high mechanical strength is required for its application characteristics. Therefore, in such a display device, a tempered glass substrate having improved mechanical strength of the glass substrate as the cover glass is mainly used. The tempered glass substrate can be manufactured in various ways, but the most commonly used method is to chemically strengthen the glass substrate. Such a chemical strengthening mode is generally performed by chemically treating the glass substrate, for example, by immersing the glass substrate in a solution such as potassium nitrate to cause ion exchange in the glass substrate.

As described above, in order to manufacture the chemically tempered glass, the glass substrate is chemically treated, and the mechanical strength of the glass substrate is improved through ion exchange. Thus, in order to produce chemically tempered glass, there is a need for a glass that is suitable for chemical reinforcement treatment, such as a suitable composition to ensure good ion exchange performance.

In addition to being suitable for chemical reinforcement, glass also needs to be equipped with a variety of other properties.

For example, in the case of a glass used for a display device such as a smart phone, a PDA, or a TV, lightness must be secured. Particularly, in recent years, as the display device such as a TV or a monitor is gradually enlarged, the area of the glass used for the display device is also becoming larger. In this case, since the warping of the glass due to the load of the glass itself may become larger, the glass needs to be made lighter in order to prevent it. In addition, when such a glass is used in a small portable display device such as a cellular phone, a PDP, and a notebook, it is required to reduce the weight of glass in order to improve portability.

In addition, the glass should have adequate processability and moldability. Otherwise, it is difficult to process or form the glass, so that it is difficult to produce a glass product meeting the desired shape and quality, and the energy and time required for processing and molding are increased, and the productivity of the glass product may be decreased.

Accordingly, an object of the present invention is to provide an alkali aluminosilicate glass which is lightweight and has good processability and is suitable for chemical strengthening treatment, and a method for producing the same, which is designed to solve the above problems.

Other objects and advantages of the present invention will become apparent from the following description, and it will be understood by those skilled in the art that the present invention is not limited thereto. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

In order to achieve the above object, the present inventor has invented a glass composition suitable for chemical strengthening while having desirable physical properties after repeated studies on aluminosilicate glass.

A glass according to one aspect of the present invention is an alkali aluminosilicate glass which comprises 73 to 78% of SiO ₂ , 1 to 6% of Al ₂ O ₃ , 10 to 14% of Na ₂ O, and ZnO 7 To 13%.

Preferably, the alkali aluminosilicate glass contains Al ₂ O ₃ + ZnO-Na ₂ O 3 -3% in terms of oxide based on weight%.

Preferably, the alkali aluminosilicate glass contains 75 to 78% of SiO ₂ , 2 to 5% of Al ₂ O ₃ , 11 to 13% of Na ₂ O and 7 to 12% of ZnO, .

Also preferably, the alkali aluminosilicate glass has a density of 2.55 g / cm ³ or less.

Preferably, the alkali aluminosilicate glass has a coefficient of thermal expansion of 6.0 10 ^-6 / ° C to 8.0 10 ^-6 / ° C.

Preferably, the alkali aluminosilicate glass has a temperature of 1200 DEG C or less at a viscosity of 10 < ⁴ > dPas.

Preferably, the alkali aluminosilicate glass has a distortion point of 490 DEG C or more and 540 DEG C or less.

According to another aspect of the present invention, there is provided a tempered glass which is chemically reinforced with the above-described aluminosilicate glass.

Preferably, the tempered glass has a surface compressive stress greater than 200 MPa and a compressive stress layer greater than 10 um.

More preferably, the tempered glass has a surface compressive stress greater than 400 MPa and a compressive stress layer greater than 20 um.

According to another aspect of the present invention, there is provided a display device including the above-described aluminosilicate glass.

According to another aspect of the present invention, there is provided a method of manufacturing an alkali aluminosilicate glass, which comprises: 73 to 78% of SiO ₂ , Al ₂ O ₃ 1 to 6%, Na ₂ O 10 to 14% and ZnO 7 to 13%.

Preferably, the glass raw material is combined so that the Al ₂ O ₃ + ZnO-Na ₂ O content is -3 to 3% based on the oxide based weight%.

Preferably, the glass raw material combination step further comprises: 75 to 78% of SiO ₂ , 2 to 5% of Al ₂ O ₃ , 11 to 13% of Na ₂ O and 7 to 12% of ZnO And combining the glass raw materials.

Also preferably, the density of the produced glass is 2.55 g / cm ³ or less.

Also preferably, the produced glass has a coefficient of thermal expansion of 6.0 占^10-6 / 占 폚 to 8.0 占^10-6 / 占 폚.

Also preferably, the viscosity of the produced glass is at a temperature of 10 < ⁴ > dPas below 1200 < 0 > C.

Also, preferably, the distortion point of the produced glass is 490 DEG C or more and 540 DEG C or less.

According to another aspect of the present invention, there is provided a method of manufacturing a tempered glass, comprising chemically reinforcing the glass produced by the method of manufacturing an aluminosilicate glass as described above.

Preferably, the prepared tempered glass has a surface compressive stress greater than 200 MPa and the prepared tempered glass has a compressive stress layer thickness greater than 10 um.

More preferably, the prepared tempered glass has a surface compressive stress greater than 400 MPa and the prepared tempered glass has a compressive stress layer thickness greater than 20 um.

According to the present invention, an alkali aluminosilicate glass suitable for improving the strength in a chemical strengthening manner can be provided.

Particularly, according to the present invention, when tempered glass is produced by the chemical strengthening treatment, it is possible to increase the surface compressive stress while increasing the thickness of the compressive stress layer.

Therefore, the glass according to the present invention can be usefully used for a cover glass of a display device which requires high mechanical strength.

According to another aspect of the present invention, a glass having a low density can be provided. Therefore, even if the glass plate has a large area, it is possible to reduce the warping due to its own weight, and it can meet the trend of increasing the size of display devices such as TVs and monitors. In addition, even in the case of a small portable device such as a portable telephone or a notebook in which a glass plate is used, its weight can be reduced, and portability can be improved.

According to still another aspect of the present invention, a glass having a thermal expansion coefficient of 6.0 x 10 ^-6 / ° C to 8.0 x 10 ^-6 / ° C can be provided. Therefore, it is suitable for use with a material having a thermal expansion coefficient in a similar range.

According to another aspect of the present invention, the temperature T ₄ at a temperature of 10 ⁴ dPas is low, so that the processing of the glass can be facilitated by lowering the processing temperature of the glass. Therefore, energy and time required for processing the glass can be reduced, and productivity of the glass and the product using the same can be improved.

In addition, according to another aspect of the present invention, a glass having a low distortion point can be provided. Therefore, the moldability of the glass can be improved, and particularly, the 3D molding of the glass can be facilitated. Therefore, according to this aspect, it is easy to manufacture the glass in a desired form including the three-dimensional shape, so that the applicability of the glass can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further the understanding of the technical idea of the invention. And should not be construed as limiting.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart schematically illustrating a process for producing aluminosilicate glass according to one embodiment of the present invention.
FIG. 2 is a graph comparing the compressive stress and the compressive stress layer thickness measurement results formed in the chemical strengthening treatment for the glass of one embodiment and the comparative example of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, it should be understood that the embodiments described herein are merely the most preferred embodiments of the present invention, and are not intended to be exhaustive of the present invention, so that various equivalents and modifications It should be understood.

The glass according to the present invention is an alkali aluminosilicate glass containing an alkali metal oxide, aluminum oxide and silicon dioxide.

More specifically, the aluminosilicate glass according to the present invention comprises SiO ₂ , Al ₂ O ₃ , Na ₂ O and ZnO as constituent components.

In particular, the aluminosilicate glass according to the present invention may contain 73 to 78% of SiO ₂ based on oxide based on weight%. SiO ₂ is a network structure product oxide that forms glass, which can contribute to increase the chemical resistance of the glass and to have an appropriate coefficient of thermal expansion that can be matched with the surrounding material of the glass. However, if SiO ₂ is contained too high, melting and molding of the glass becomes difficult, the coefficient of thermal expansion becomes too low, and the devitrification properties of the glass may deteriorate. On the other hand, when SiO ₂ is contained too low, the chemical resistance is reduced, the density is increased, the thermal expansion coefficient is increased, and the strain point may be lowered. Accordingly, the aluminosilicate glass according to the present invention comprises 73 to 78% by weight of SiO ₂ . Preferably, the SiO _{2 content} is 75 to 78% by weight.

The aluminosilicate glass according to the present invention may contain 1 to 6% by weight of Al ₂ O ₃ based on the oxide. Al ₂ O ₃ increases the high temperature viscosity, chemical stability and thermal shock resistance of glass, and can contribute to enhancement of strain point and Young's modulus. However, when Al ₂ O ₃ is contained too high, the devitrification resistance, hydrochloric acid resistance and BHF resistance can be decreased and the viscosity can be increased. On the other hand, when the content of Al ₂ O ₃ is too low, the effect of the addition is hardly achieved and the modulus of elasticity can be lowered. Accordingly, the aluminosilicate glass according to the present invention comprises 1 to 6% by weight of Al ₂ O ₃ . Preferably, the Al ₂ O ₃ is contained in an amount of 2 to 5% by weight. More preferably, the Al ₂ O _{3 content} is 3 to 5% by weight.

The aluminosilicate glass according to the present invention may contain 10 to 14% by weight of Na ₂ O based on oxide. Na ₂ O is a component to be ion-exchanged in a chemical strengthening treatment process in a potassium nitrate (KNO ₃ ) solution or the like, and can improve the melting property, moldability or moldability of the glass, lower the viscosity of the glass at high temperature, have. However, when Na ₂ O is contained excessively, the coefficient of thermal expansion of the glass becomes too large to be matched with the surrounding material, and the resistance to devitrification and thermal shock may be deteriorated. On the other hand, if Na ₂ O is contained too low, the effect of the addition is difficult to achieve and the ion exchange performance in the chemical strengthening treatment process may be deteriorated. Therefore, the aluminosilicate glass according to the present invention contains 10 to 14% by weight of Na ₂ O. Preferably, the Na ₂ O is contained in an amount of 11 to 13% by weight.

The aluminosilicate glass according to the present invention may contain 7 to 13% by weight of ZnO based on oxide. ZnO can contribute to improve the ion exchange performance, strain point and Young's modulus of glass. However, if ZnO is contained too high, the devitrification property of the glass may be deteriorated, which is not preferable from the viewpoint of cost. On the other hand, when the ZnO content is too low, it is difficult to achieve the ZnO addition characteristics described above. Accordingly, the aluminosilicate glass according to the present invention comprises 7 to 13% by weight of ZnO. Preferably, the ZnO is contained in an amount of 7 to 12% by weight. More preferably, the ZnO is contained in an amount of 7 to 9% by weight.

Here, it is more preferable that the aluminosilicate glass according to the present invention contains Al ₂ O ₃ , ZnO, and Na ₂ O in an amount expressed by weight% based on the oxide in the following relationship.

_{-3 ≤ Al 2 O 3 + ZnO} -Na 2 O ≤ 3

That is, in the aluminosilicate glass according to the present invention, it is preferable that the total content of Al ₂ O ₃ and ZnO minus the content of Na ₂ O is -3 to 3 wt%. More preferably, each component is contained in an amount of from -3 to 1% by weight of Al ₂ O ₃ + ZnO-Na ₂ O. In such a concentration range, the effect of containing them can be further improved, and in particular, ion exchange performance, melting property, moldability and the like can be further improved.

Preferably, the aluminosilicate glass according to the present invention may have a density of 2.55 g / cm < ³ > or less. More preferably, the aluminosilicate glass according to the present invention may have a density of 2.50 g / cm < ³ > or less. According to this embodiment, the density of the glass is low, so that it is easy to achieve weight reduction of the glass product. Particularly, in a situation where a glass device is enlarged as a display device and the area of the glass is gradually increasing, when the density of the glass is lowered, the warping due to the self-load of the glass is reduced and the weight of the glass- . Further, the weight of the glass itself can be lowered also for a portable apparatus or a device, and portability can be improved.

Also, preferably, the aluminosilicate glass according to the present invention may have a coefficient of thermal expansion (CTE) of 6.0 × 10 ^-6 / ° C. to 8.0 × 10 ^-6 / ° C. According to this aspect, it is possible to prevent the problem of peeling due to the thermal expansion difference when the material is used together with a material having a similar range of thermal expansion coefficient, such as a similar range of metal, organic adhesive, and the like.

Also preferably, the aluminosilicate glass according to the present invention may have a T ₄ of 1200 ° C or less at a temperature of 10 ⁴ dPas. More preferably, the aluminosilicate glass according to the present invention may have a T ₄ of 1180 캜 or less at a temperature of 10 ⁴ dPas. According to this embodiment, since the T ₄ associated with the processing temperature of the glass is low, the processing of the glass can be facilitated, and the energy and time required for processing the glass can be saved.

Also preferably, the aluminosilicate glass according to the present invention has a strain point of 490 DEG C or higher and 540 DEG C or lower. Therefore, according to this aspect of the present invention, the moldability of the glass can be improved. Particularly, the 3D molding of glass is easy, and the glass can be easily manufactured in a desired shape, so that the usability of the glass can be further improved.

The tempered glass according to the present invention can be produced using the above-described aluminosilicate glass. That is, the tempered glass according to the present invention is an aluminum oxide containing 73 to 78% of SiO ₂ , 1 to 6% of Al ₂ O ₃ , 10 to 14% of Na ₂ O and 7 to 13% of ZnO, It is tempered glass whose strength is improved by chemically reinforcing the non-silicate glass.

The tempered glass according to the present invention can have a compressive stress layer on its surface by chemical strengthening treatment. At this time, the compressive stress (CS) of the compressive stress layer may exceed 200 MPa. That is, the aluminosilicate glass according to the present invention may have a surface compressive stress exceeding 200 MPa during chemical strengthening treatment. More preferably, the compressive stress of the surface compressive stress layer may exceed 400 MPa. More preferably, the surface compressive stress may exceed 500 MPa. According to this embodiment, since the compressive stress of the compressive stress layer is large, the mechanical strength of the tempered glass can be improved.

Further, the tempered glass according to the present invention may have a compressive stress layer (DOL) of more than 10 mu m. That is, the aluminosilicate glass according to the present invention may have a compressive stress layer thickness exceeding 10 탆 formed by the chemical strengthening treatment. More preferably, the thickness of the compressive stress layer may exceed 20 [mu] m. More preferably, the thickness of the compressive stress layer may exceed 40 [mu] m. According to this embodiment, since the thickness of the compressive stress layer is large, the mechanical strength of the tempered glass can be improved. Particularly, if the thickness of the compressive stress layer is large, the glass may not be damaged even if it is damaged to a certain depth.

The display device according to the present invention may include the above-described alkali aluminosilicate glass. In particular, the display device according to the present invention may include a tempered glass chemically reinforced with the above-described alkali aluminosilicate glass. For example, the display device according to the present invention may be a display device such as an LCD, a PDP, an LED, and an OLED, and the above-described tempered glass may be included as a cover glass (protective glass).

Hereinafter, a method for producing the above-described alkali aluminosilicate glass according to a preferred embodiment of the present invention will be described.

1 is a flow chart schematically illustrating a method of producing an alkali aluminosilicate glass according to an embodiment of the present invention.

Referring to FIG. 1, raw materials of respective components contained in glass are first combined to a target composition (S110). At this time, in step S110, it is preferable that 73 to 78% of SiO ₂ , 1 to 6% of Al ₂ O ₃ , 10 to 14% of Na ₂ O, and 7 to 13% of ZnO are contained Combine raw ingredients.

At this time, it is preferable that the glass raw materials are combined so that Al ₂ O ₃ + ZnO-Na ₂ O is in the range of -3 to 3 in terms of oxide based weight%.

More preferably, the glass raw material may be combined so that Al ₂ O ₃ + ZnO-Na ₂ O is in the range of -3 to 1 in terms of oxide based weight%.

Preferably, the step of S110 may further include a step of forming an oxide film on the basis of 75 to 78% of SiO ₂ , 2 to 5% of Al ₂ O ₃ , 11 to 13% of Na ₂ O, and 7 to 12 of ZnO, % ≪ / RTI >

Next, the glass raw material thus combined is heated to a predetermined temperature, for example, 1500 to 1600 ° C to melt the glass raw material (S120), and the melted glass is formed (S130). In this case, step S130 may be performed by a float method using a float bath, but the present invention is not necessarily limited to such a molding method. For example, the step of S130, that is, the step of forming the glass, may be performed by a down draw method or a fusion method.

If the glass is formed in step S130, the formed glass is transferred to the annealing furnace and is slowly cooled (S140). Then, the slowly cooled glass is cut to a desired size, and further processing such as polishing is performed, and the glass product can be manufactured through this series of processes.

As described above, the aluminosilicate glass produced by the glass manufacturing method according to an embodiment of the present invention may have a density of 2.55 g / cm ³ or less. Preferably, the aluminosilicate glass thus produced may have a density of 2.50 g / cm ³ or less. The thermal expansion coefficient of the produced aluminosilicate glass may be 6.0 to 8.0 [占 10 ^-6 / 占 폚]. Also, the aluminosilicate glass thus produced may have a T ₄ of 1200 ° C or less. Preferably, the aluminosilicate glass thus produced may have a T ₄ of less than or equal to 1180 ° C. The aluminosilicate glass thus produced may have a distortion point of 490 DEG C or more and 540 DEG C or less.

The method for manufacturing a tempered glass according to the present invention includes chemical strengthening treatment of the glass produced by the above-described method for producing an aluminosilicate glass.

That is, the tempered glass manufacturing method according to the present invention can perform the chemical strengthening treatment of the aluminosilicate glass manufactured through steps S110 to S140 by performing the tempering after step S140. In this case, the chemical strengthening treatment step may be performed by immersing the aluminosilicate glass in a molten salt such as potassium nitrate (KNO ₃ ) for a predetermined time, but the present invention is not necessarily limited to the chemical strengthening treatment method.

Thus, tempered glass produced by the tempered glass manufacturing method according to an embodiment of the present invention can have a surface compressive stress exceeding 200 MPa and a compressive stress layer thickness exceeding 10 um. Preferably, tempered glass produced in accordance with the present invention may have a surface compressive stress exceeding 400 MPa and a compressive stress layer thickness exceeding 20 um. More preferably, tempered glass produced according to the present invention can have a surface compressive stress exceeding 500 MPa and a compressive stress layer thickness exceeding 40 um.

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. It should be understood, however, that the embodiments of the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The embodiments of the present invention are provided to enable those skilled in the art to more fully understand the present invention.

Table 1 shows the glass composition and physical properties of the examples according to the present invention.

The raw materials of the respective components were combined so as to have a composition (based on weight%) as shown in Table 1 and melted by heating at 1600 캜 for 3 hours using a platinum crucible. During the melting, a platinum stirrer was inserted and the glass was homogenized by stirring for 1 hour. Subsequently, the molten glass was slowly cooled at 730 DEG C to obtain a glass of each of the Examples. On the other hand, the obtained glass was confirmed by fluorescent X-ray analysis.

Further, density, thermal expansion coefficient, T ₄ , distortion point and standing point were measured by the following methods as physical properties for each glass of the examples, and the results are shown in Table 1.

(density)

For each example glass, the density was measured using the Archimedes method. At this time, the density unit is g / cm ³ .

(Thermal Expansion Coefficient) (CTE)

For each example glass, the average thermal expansion coefficient was measured using a dilatometer. At this time, the thermal expansion coefficient unit is 10 ^-6 / ° C.

(T ₄ )

For each example glass, the viscosity was measured using a high-temperature viscometer, and the temperature T ₄ at which the viscosity reached 10 ⁴ dPa · s was measured. In this case, the unit of T ₄ is ° C.

(Distortion point)

For each example glass, the distortion points were measured by the fiber elongation method using ASTM C336. In this case, the unit of the distortion point is ° C.

(West cold point)

For each example glass, the cold point was measured by a fiber elongation method using ASTM C336. At this time, the unit of the standing cold point is ℃.

Referring to Table 1, the glass of Examples (Examples 1 to 10) had a density of 2.55 g / cm ³ or less, more specifically 2.50 g / cm ³ or less, and an average coefficient of thermal expansion (CTE) 8.0 (占 10 ^-6 / 占 폚). Further, in the case of the glass of the examples, it was confirmed that T ₄ was 1200 ° C or less, more specifically 1180 ° C or less, and the distortion point was 490 ° C or more and 540 ° C or less.

As a result of various physical property measurement results of this embodiment, it can be seen that the aluminosilicate glass according to the present invention is low in density and easy to achieve weight reduction. In addition, in the case of the aluminosilicate glass according to the present invention, it can be seen that the glass having a low T ₄ has good workability and a low distortion point so that glass molding such as 3D molding can be easily performed.

In addition, the aluminosilicate glass according to the present invention can be formed to have a high surface compressive stress and a high compressive stress layer in the chemical strengthening treatment.

In order to examine these effects, the surface compressive stress (CS) and the compressive stress layer thickness (DOL) were measured after the chemical strengthening treatment was performed on the glass of Example 1. The results are shown in Table 2.

At this time, the compressive stress and the compressive stress layer thickness were measured using a surface stress measuring instrument (FSM-6000LE).

Here, the chemical strengthening treatment was performed by immersing the glass of Example 1 for a predetermined time in a bath containing a potassium nitrate (KNO ₃ ) solution. At this time, the chemical strengthening treatment temperature and time for Example 1 are as shown in Table 2.

For comparison with the chemical strengthening treatment effect of Example 1, a glass of a predetermined comparative example was prepared.

At this time, each of the raw materials was combined so as to be 70.6% SiO ₂ , 1.9% Al ₂ O ₃ , 13.3% Na ₂ O, 0.3% K ₂ O, 4.6% MgO, and 8.8% CaO, Thereafter, as in the case of the above example, melting was performed by heating at a temperature of 1600 ° C for 3 hours using a platinum crucible, followed by slow cooling at 730 ° C.

The surface compression stress (CS) and the compressive stress layer thickness (DOL) were measured after the chemical strengthening treatment was applied to the thus obtained comparative glass. The results are shown in Table 3.

Also in this comparative example, the chemical strengthening treatment was performed by immersing the glass of the comparative example in a bath containing a potassium nitrate (KNO ₃ ) solution for a predetermined time. At this time, the temperature and time for the chemical strengthening treatment for the glass of the comparative example are as shown in Table 3.

On the other hand, the measurement results of the compressive stress and the compressive stress layer thickness for the glass of Example 1 of Table 2 and Table 3 and the glass of the comparative example are shown in Fig. 2 for convenience of comparison.

Referring to Tables 2 and 3 and FIG. 2, it can be seen that, in the case of the glass of Example 1 according to the present invention, the compressive stress layer thickness is formed to be close to 20 μm or more and more to 80 μm, . On the other hand, in the case of the glass of the comparative example, it can be seen that the compressive stress layer thickness is relatively thin, which is only 8 μm to 15 μm.

Therefore, when the chemical tempered glass is manufactured using the aluminosilicate glass according to the present invention, it is possible to increase the thickness of the compressive stress layer while securing a surface compressive stress of a predetermined level or more. can confirm.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

Claims (19)

SiO _2, Al ₂ O _3, Na ₂ O and ZnO,
As an oxide based weight percent indication,
73 to 78% SiO ₂ ;
1 to 5% of Al ₂ O ₃ ;
Na ₂ O 11-14%; And
ZnO 7-13%
≪ / RTI >
A coefficient of thermal expansion of 6.0 占^10-6 / 占 폚 to 7.3 占^10-6 / 占 폚,
And the distortion point is from 490 DEG C to 540 DEG C inclusive. The method according to claim 1,
Al ₂ O _3, ZnO and Na ₂ O in terms of% by weight based on the oxide,
Wherein the aluminosilicate glass has the following relationship.
_{-3 ≤ Al 2 O 3 + ZnO} -Na 2 O ≤ 3 The method according to claim 1,
As an oxide based weight percent indication,
75 to 78% SiO ₂ ;
Al ₂ O ₃ 2 to 5%;
Na ₂ O 11 to 13%; And
ZnO 7-12%
≪ RTI ID = 0.0 > aluminosilicate < / RTI > The method according to claim 1,
Alumino-silicate glass, characterized in that a density of less than 2.55 g / cm ^3. The method according to claim 1,
Wherein the temperature at a viscosity of 10 < ⁴ > dPas is 1200 [deg.] C or lower. delete delete delete delete A display device comprising an aluminosilicate glass according to any one of claims 1 to 5. SiO _2, Al ₂ O _3, Na ₂ O and ZnO,
As an oxide based weight percent indication,
73 to 78% SiO ₂ ;
1 to 5% of Al ₂ O ₃ ;
Na ₂ O 11-14%; And
ZnO 7-13%
≪ RTI ID = 0.0 > and / or < / RTI &
The produced glass has a thermal expansion coefficient of 6.0 占^10-6 / 占 폚 to 7.3 占^10-6 / 占 폚,
And the distortion point of the produced glass is 490 DEG C or more and 540 DEG C or less. 12. The method of claim 11,
Wherein the glass raw material combining step comprises:
Al ₂ O _3, ZnO and Na ₂ O in terms of% by weight based on the oxide,
Wherein the glass raw material is combined so as to have the following relationship.
_{-3 ≤ Al 2 O 3 + ZnO} -Na 2 O ≤ 3 12. The method of claim 11,
As an oxide based weight percent indication,
75 to 78% SiO ₂ ;
Al ₂ O ₃ 2 to 5%;
Na ₂ O 11 to 13%; And
ZnO 7-12%
≪ / RTI > by weight of the aluminosilicate glass. 12. The method of claim 11,
Aluminosilicate glass production method, characterized in that the density of the produced glass not more than 2.5 g / cm ^3. 12. The method of claim 11,
Wherein the glass has a viscosity of 10 < ⁴ > dPas and a temperature of 1200 DEG C or less. delete delete delete delete

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