JP2001130923A - CHEMICALLY STRENGTHENED Li ABSORBING GLASS AND METHOD FOR PRODUCTION OF CHEMICALLY STRENGTHENED GLASS USING THE SAME - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide Li ion absorbing glass for chemical strengthening and the like suitable for the chemical strengthening without reducing characteristics such as an ion exchanging rate, chemical durability and the like. SOLUTION: This Li absorbing glass for chemical strengthening is soaked in a molten salt in order to absorb Li ion eluted into the molten salt when strengthening Li2O-containing glass with the molten salt containing Na2O and/or K2O and contains 25-40 wt.% of Na2O and 30-60 wt.% of SiO2 as main ingredients. The aforesaid glass for chemical strengthening essentially contains no B2O3, PbO, BaO and Li2O.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a metal salt which elutes from a base glass by ion exchange into a molten salt during chemical strengthening.
The present invention relates to a Li-absorbing glass having a function of absorbing i, and particularly to a Li-absorbing glass for chemical strengthening suitable for chemical strengthening, and a method of manufacturing a chemically strengthened glass using the Li-absorbing glass for chemical strengthening.

[0002]

2. Description of the Related Art It is known that the surface of a glass substrate or the like is chemically strengthened for the purpose of improving the strength of the glass substrate or the like. Specifically, in order to improve mechanical strength such as shock resistance (including strength against drop) and vibration resistance, and to prevent glass substrates etc. from being damaged by shock or vibration,
It is known that a surface of a glass substrate is subjected to a chemical strengthening treatment by a low-temperature ion exchange method.

[0003] The chemical strengthening treatment is performed, for example, by immersing a base material glass containing Li ions in a molten salt containing Na ions and / or K ions.
Na ions having a larger ion radius than Li ions,
This is a process of increasing the strength by generating a strong compressive stress in the glass surface layer by replacing the ions with K ions by ion exchange.

[0004]

However, due to the chemical strengthening ion exchange reaction, Li ions in the base glass are eluted into the molten salt, and the Li concentration in the molten salt increases as the number of treatments increases. In addition, there is a problem that ion exchange due to chemical strengthening hardly occurs, and a predetermined mechanical strength or the like cannot be obtained. In order to solve this problem, Japanese Patent Publication No. 6-71521 proposes a technique for removing Li ions eluted in a molten salt using an adsorbent composed of γ-alumina. There is a problem that the Li concentration starts to increase after a certain period of time. Also,
Japanese Patent Application Laid-Open No. 64-24053 discloses a technique of absorbing ions eluted in a molten salt with an ion-absorbing glass when producing a refractive index distribution glass by ion exchange. However, such a technique has a harmful effect due to the inclusion of an inappropriate component, and is intended to manufacture a refractive index distribution glass by ion exchange. Therefore, the technique is directly applied to ion exchange for chemical strengthening. Can not.

The present invention has been made under the above-mentioned background, and has as its primary object to provide a Li ion-absorbing glass for chemical strengthening suitable for chemical strengthening. In addition, L for chemical strengthening
A second object is to provide a method for producing chemically strengthened glass using i-ion absorbing glass. Further, a third object is to provide a Li ion absorbing glass or the like having improved performance such as an ion exchange rate.

[0006]

To achieve the above object, the present invention has the following constitution.

(Constitution 1) Glass containing Li ₂ O is replaced with N
When chemically strengthening with a molten salt containing a ₂ O and / or K ₂ O, a Li absorbing glass for chemical strengthening immersed in the molten salt for the purpose of absorbing Li ions eluted in the molten salt, Li for chemical strengthening containing 20 wt% or more of Na ₂ O
Absorbing glass.

(Structure 2) Glass containing Li ₂ O is replaced with N
When chemically strengthening with a molten salt containing a ₂ O and / or K ₂ O, a Li absorbing glass for chemical strengthening immersed in the molten salt for the purpose of absorbing Li ions eluted in the molten salt, Na ₂ O and 20 to 40 wt%, a SiO ₂ 30 to 60
Li absorption glass for chemical strengthening mainly containing wt%.

(Constitution 3) Glass containing Li ₂ O is replaced with N
When chemically strengthening with a molten salt containing a ₂ O and / or K ₂ O, a Li absorbing glass for chemical strengthening immersed in the molten salt for the purpose of absorbing Li ions eluted in the molten salt, Na ₂ O of 23~40wt%, the SiO ₂ 30 to 60
Li absorption glass for chemical strengthening mainly containing wt%.

(Constitution 4) Glass containing Li ₂ O is replaced with N
When chemically strengthening with a molten salt containing a ₂ O and / or K ₂ O, a Li absorbing glass for chemical strengthening immersed in the molten salt for the purpose of absorbing Li ions eluted in the molten salt, Na ₂ O of 25~40wt%, the SiO ₂ 30 to 60
wt%, mainly containing Li absorption glass for chemical strengthening.

(Structure 5) K_Two0 to 15 wt% O, Cs_Two
0-15 wt% O, 0-15 wt% MgO, CaO
0-15 wt%, SrO 0-15 wt%, ZnO
0-15 wt%, TiO_Two0 to 15 wt%, Nb_TwoO_Five
0 to 15 wt%, Ta_TwoO_FiveFrom 0 to 15 wt%, La_Two
O_ThreeFrom 0 to 15 wt%, Y_TwoO_ThreeFrom 0 to 15 wt%, Yb _Two
O_Three0-15 wt%, Gd_TwoO_Three0 to 15 wt%, A
l_TwoO_ThreeFrom 0 to 15 wt%, WO_ThreeFrom 0 to 15 wt%, S
b_TwoO_ThreeFrom 0 to 15 wt%, As_TwoO_ThreeFrom 0 to 15 wt%,
ZrO_Two0-15 wt%, TeO_TwoFrom 0 to 15 wt%,
Bi_TwoO_Three0 to 15 wt._TwoO_Three0-4 wt%, Ba
0 to 4 wt% of O and 0 to 3 wt% of PbO
The chemical strength according to any one of the constitutions 1 to 4, characterized in that:
Li absorption glass for chemical conversion.

(Structure 6) B ₂ O ₃ , PbO, BaO and L
6. The chemical-strengthening Li-absorbing glass according to any one of the constitutions 1 to 5, wherein one or more components of i ₂ O are not substantially contained.

(Constitution 7) A glass containing Li ions in an amount sufficient for the strength of chemical strengthening is used as the base glass,
Using the Li absorption glass for chemical strengthening according to any one of the constitutions 1 to 6, immersing them in a molten salt containing Na ₂ O and / or K ₂ O to chemically strengthen the base glass. A method for producing chemically strengthened glass.

(Configuration 8) Li_TwoGlass containing O
When exchanging ions, absorb the Li ions eluted in the molten salt.
Of Li absorption glass immersed in molten salt for the purpose of
And Na_TwoO containing at least 20 wt%, SiO_Two, P_TwoO_Five
And GeO_TwoContaining 30-60 wt% of any of
And K_Two0 to 15 wt% O, Cs_Two0 to 15
wt%, MgO 0-15 wt%, CaO 0-15 w
t%, SrO: 0 to 15 wt%, ZnO: 0 to 15 wt
%, TiO_Two0 to 15 wt%, Nb_TwoO_Five0-15w
t%, Ta_TwoO_FiveFrom 0 to 15 wt%, La_TwoO_Three0 to 15
wt%, Y_TwoO_ThreeFrom 0 to 15 wt%, Yb_TwoO_Three0 to 15
wt%, Gd_TwoO_ThreeFrom 0 to 15 wt%, Al _TwoO_Three0 to 1
5wt%, WO_Three0 to 15 wt%, Sb_TwoO_Three0 to 1
5wt%, As_TwoO_ThreeFrom 0 to 15 wt%, ZrO_Two0 to
15wt%, TeO_Two0 to 15 wt%, Bi_TwoO_ThreeTo 0
~ 15wt, B_TwoO_Three0-4wt%, BaO 0-4w
tb, and 0 to 3 wt% of PbO.
Li absorption glass.

(Configuration 9) B ₂ O ₃ , PbO, BaO and L
The Li-absorbing glass according to Configuration 8, wherein the Li-absorbing glass is substantially free of at least one component of i ₂ O.

[0016]

The Li ion-absorbing glass for chemical strengthening of the present invention comprises:
Na contains many ₂ O, the chemical strengthening conditions, The more the content of Na ₂ O in the Li ion absorbing glass, L
Since the speed of i-ion absorption is increased and the amount of Li-ion absorbed is increased, the concentration of Li-ion in the molten salt can always be kept low, whereby chemical strengthening having a predetermined mechanical strength and a depth of the compressive stress layer is achieved. A glass is obtained. Further, the Li ion-absorbing glass for chemical strengthening of the present invention does not contain an inappropriate component or has a small amount of an inappropriate component, so that the performance such as the ion exchange rate and the chemical durability does not decrease.

Further, according to the method for producing chemically strengthened glass of the present invention, a glass containing an amount of Li ions sufficient for obtaining a sufficient strength of chemical strengthening is used as the base glass, and the glass for chemical strengthening of the present invention is used. Since the ion absorbing glass is used, a chemically strengthened glass having a predetermined mechanical strength and a predetermined depth of the compressive stress layer can be obtained. Further, there is an effect that the Li ion concentration in the molten salt is not increased, and it is not necessary to replace the molten salt having the increased Li ion concentration, so that the production efficiency is high.

Further, according to the Li ion-absorbing glass of the present invention, since the unsuitable component is not contained or the unsuitable component is small, the Li ion having improved performance such as ion exchange rate and chemical durability is provided. An absorbing glass is obtained.

Hereinafter, the present invention will be described in detail. The reasons for limiting the contents in the chemical strengthening Li ion absorbing glass of the present invention and the Li ion absorbing glass of the present invention are as follows.

Na ₂ O is an essential component as a component for performing ion exchange again with Li ions eluted in the molten salt during ion exchange, particularly during ion exchange during chemical strengthening. Na ₂ O
It was found that as the content of Li in the Li-absorbing glass increased, the speed of absorbing Li in the molten salt and the absolute amount of absorbing Li increased. In particular, at the time of ion exchange during chemical strengthening, the speed of absorbing Li in the molten salt is important.
This is because if the speed of absorbing Li in the molten salt is high, the Li ion concentration in the molten salt can always be kept low. From these facts, Na ₂ O is 20w
It is preferable to contain t% or more. Na ₂ O is 4
If the content exceeds 0 wt%, vitrification may not occur, or the chemical durability of the glass may be reduced, and the Li-absorbing glass itself may be dissolved in the molten salt. Therefore, the upper limit is preferably set to 40 wt% or less. More preferably, the content of Na ₂ O is 23 to 40 wt%, and further preferably, 25 to 40 wt%.
%.

SiO ₂ is used as a glass forming component and N 2
It is preferred that the a ₂ O vitrification also contain many as 20 to 40 wt%, and contains as a component for strong chemical resistance to the molten salt. The preferred content of SiO ₂ is in the range of 30 to 60 wt%. As the glass forming component, P ₂ O ₅ or GeO ₂ may be used instead of SiO ₂ . The preferred content of P ₂ O _5, GeO ₂ is in the range of 30 to 60 wt%, respectively.

B_TwoO_ThreeIs added as a glass forming component
Chemical resistance against molten salt deteriorates,
Since it elutes in the molten salt, B_TwoO_Three: 4 wt% or less
Preferably, B_TwoO_Three: 1 wt% or less
More preferably, further, B _TwoO_ThreeDoes not substantially contain
Is most preferred.

Since the absorption of Li is inhibited when Li is contained in the Li absorption glass, the Li absorption glass preferably does not contain Li ions. In particular, in the Li ion absorbing glass for chemical strengthening, in order to chemically strengthen in a short time and obtain a predetermined strength and a depth of a compressive stress layer (strain layer), L
Preferably, it does not contain i-ions.

Other optional components include K ₂ O, Cs ₂ O,
MgO, CaO, SrO, BaO, PbO, ZnO, T
iO ₂ , Nb ₂ O ₅ , Ta ₂ O ₅ , La ₂ O ₃ , Y ₂ O ₃ , Yb ₂
O ₃ , Gd ₂ O ₃ , Al ₂ O ₃ , WO ₃ , Sb ₂ O ₃ , As
₂ O ₃ , ZrO ₂ , TeO ₂ and Bi ₂ O ₃ are each 0-15
It can be added in the range of wt%. However, BaO, Pb
O reduces the ion conversion rate of Li ₂ O, so Ba
O: 4 wt% or less, PbO: preferably 3 wt% or less, BaO: 1 wt% or less, more preferably PbO: 1 wt% or less, furthermore, BaO, P
Most preferably, bO is not substantially contained.

The composition of the Li absorbing glass of the present invention is as follows:
The glass composition has no relation to the composition of the base glass, has a high ability to absorb Li and the like, and does not contain any inappropriate components.

In the method for producing a chemically strengthened glass of the present invention, it is necessary to use a glass containing Li ions in such an amount that a sufficient strength of the chemical strengthening can be obtained as the base glass. As a composition of such a base glass, for example, L
i ₂ O: 8 to 13 wt%, SiO ₂ : 76 to 84 wt%, A
l ₂ O ₃ : 1 to ₇ wt%, Na ₂ O: 0 to ₃ wt%, K ₂ O:
0~6wt%, B ₂ O _3: contains 0 to 3wt%, MgO,
Base glass (hereinafter, referred to as base glass 1) containing 0 to 5 wt% of at least one of CaO, SrO, BaO, PbO, and ZnO.

Other compositions of the base glass include, for example,
SiO _2: 62-75 wt%, Al ₂ O _3: 5~15 wt%, Li ₂ O: 4~10 wt%, Na ₂ O: 4~12 wt%, ZrO _2: 5.5 to 15 wt% And the weight ratio of Na ₂ O / ZrO ₂ is 0.5 to
2.0, Al ₂ O ₃ / ZrO ₂ weight ratio of 0.4 to 2.5
Aluminosilicate glass (hereinafter referred to as base material glass 2). Moreover, the undissolved product of ZrO ₂ is eliminated protrusion of the glass substrate surface caused by cause, by mol%, a SiO ₂ fifty-seven to seventy-four%, a ZrO ₂ 0 to
2.8%, the Al ₂ O ₃ 3 to 15% of LiO ₂ 7 to 16
%, 4-14% of Na ₂ O, (hereinafter referred to as the mother glass 3) aluminosilicate glass containing, and the like are preferable. Still another composition of the base glass includes, for example, the following glasses. wt%, SiO ₂ : 61-7
_{5%, Al 2 O 3:} 10~22%, Li 2 O: 4~8%,
Na ₂ O: 10.1~15%, (hereinafter referred to as matrix glass 4) aluminosilicate glass containing. In mole%, S
_{iO 2: 35~70%, Al 2} O 3: 0~15%, Li 2 O
+ Na ₂ O: 3 to 30%, CaO: 1 to 45%, CaO
_{+ MgO: 3~45%, TiO 2} : 0.1~30%, ( hereinafter referred to as the mother glass 5) aluminosilicate glass containing. Such aluminosilicate glass is chemically strengthened to provide excellent balance among the compressive stress generated in the surface layer, tensile stress generated inside, and the depth of the compressive stress layer, as well as excellent bending strength and heat resistance. In addition, even under a high temperature environment, there is no precipitation of Na, flatness is maintained, and Knoop hardness is excellent. Such an aluminosilicate glass is suitable, for example, as a glass substrate for a magnetic recording medium.

In the method for producing chemically strengthened glass, the base glass and the Li ion absorbing glass have different compositions.

In the method for producing chemically strengthened glass of the present invention, the conditions for chemically strengthening with a molten salt containing Na ₂ O and / or K ₂ O are as follows. Temperature: 280 to 490 ° C., Processing time: several hours to several tens of hours, temperature of molten salt: 300 to 450 ° C.
Processing time: 2 hours to 8 hours is more preferable. Under this condition, the balance between the strength and the depth of the compressive stress layer is excellent. In particular, the temperature of the molten salt: about 400 ° C., the processing time: 8
When the time is about the time, the strength is large and the depth of the compressive stress layer is also deep, which is preferable. Similarly, the base glass 2 to 5
In this case, the temperature of the molten salt is preferably from 280 ° C. to the strain point or lower, the processing time is preferably several minutes to several tens of hours, and the temperature of the molten salt is 300.
To 500 ° C., treatment time: several minutes to several tens of hours are more preferable.

[0030]

EXAMPLES The present invention will be described below more specifically based on examples. (Examples 1 to 15 and Comparative Examples 1 and 2) Li-absorbing glasses were prepared according to the compositions (% by weight) of Examples 1 to 15 shown in Tables 1 and 2 (continuation of Table 1). Any of carbonates, nitrates and oxides can be used as the blended raw materials. These raw materials are weighed in a desired ratio, mixed and prepared as blended raw materials, and put into a melting furnace heated to 1100 ° C. to 1450 ° C. The mixture was dissolved, clarified, stirred, homogenized, and then cast into a mold. These Li absorption glasses were immersed in a molten salt to which Li ions had been added in advance, and the Li ion concentration in the molten salt was examined. Further, these Li ion-absorbing glasses and the base glasses shown in Tables 1 and 2 were immersed in a molten salt, and the bending strength and the depth of the compressive stress layer of the base glasses were examined. The results are shown in Tables 1 and 2 (continued from Table 1).

[0031]

[Table 1]

[Table 2]

The Li ion concentration in Tables 1 and 2 is as follows:
The size of the powder to remain in 1mm square through a 2.8mm angle finely grinding the Li ion absorbing glass obtained in the above as a _{sample, KNO 3: NaNO 3 = 1} : in first molten salt, Li ions 300 ppm, and Li ion-absorbing glass at 10% with respect to the weight of the molten salt.
It shows the Li ion concentration in the molten salt after holding for a day.

From the results of Tables 1 and 2, it was confirmed that Li ions previously added to the molten salt were absorbed by the action of the Li-absorbing glass, and the Li ion concentration in the molten salt was greatly reduced. In addition, it was also confirmed that the greater the amount of Na ₂ O in the Li-absorbing glass, the lower the Li concentration in the molten salt.

Table 1 shows the bending strength 1 and the depth of the compressive stress layer.
And a standard specimen for bending strength test (size 40 × 3 mm, thickness 1 mm, polished on both sides) consisting of a base glass having the composition shown in Table 2 and a molten salt of KNO ₃ : NaNO ₃ = 1: 1 400 ℃ × 8h from initial state without Li ion
It is a result of the transverse rupture strength and the depth of a compressive stress layer when chemical strengthening was performed on condition r. Flexural strength 2 is obtained by finely pulverizing a Li-absorbing glass, passing a 2.8 mm square, and keeping a 1 mm square powder as a sample. Assuming that Li ions are eluted at 50 ppm / day due to chemical strengthening, Li ions are added at 50 ppm / day and 400 ° C.
The results are obtained by performing chemical strengthening at 400 ° C. for 8 hours after 30 days and measuring the bending strength. The bending strength 3 is 400 ° C. after 60 days after further adding 50 ppm / day of Li ions.
This is the result of measuring the bending strength by chemically strengthening for 8 hours.

From the results shown in Tables 1 and 2, it was found that Li
In both cases where the absorbing glass was not immersed (Comparative Example 1) and where Li in the molten salt was adsorbed using γ-alumina (Comparative Example 2), the transverse rupture strength decreased as the chemical strengthening was performed. However, it was confirmed that even if chemical strengthening was performed by adding the Li-absorbing glass of Examples 1 to 15, the reduction in bending strength was small. In addition, it was confirmed that the depth of the compressive stress layer was within a predetermined range by adding the Li absorption glass of Examples 1 to 15. Furthermore, it was also confirmed that the degree of reduction in bending strength was smaller as the amount of Na ₂ O in the Li-absorbing glass was larger.

The present invention has been described with reference to the embodiments.
The present invention is not limited to the above embodiment.

For example, the composition and shape of the Li-absorbing glass, the composition and shape of the base glass, the conditions for chemical strengthening, and the like are not limited to the scope of the embodiment, but can be changed as appropriate within the scope of the present invention.

The chemically strengthened glass obtained by the method for producing a chemically strengthened glass of the present invention can be widely used for applications such as glass substrates and glass products that require mechanical strength such as drop strength and impact resistance.

[0039]

As described above, the Li ion absorbing glass for chemical strengthening of the present invention contains a large amount of Na ₂ O,
The Na ₂ O content in the ion-absorbing glass can be adjusted to control (increase) the speed and amount of Li ion absorption under chemical strengthening conditions, and the Li ion concentration in the molten salt can always be kept low. A chemically strengthened glass having a predetermined strength and a depth of the compressive stress layer is obtained. Further, the Li ion-absorbing glass for chemical strengthening of the present invention does not contain an inappropriate component or has a small amount of an inappropriate component, so that the performance such as the ion exchange rate and the chemical durability does not decrease.

Further, according to the method for producing chemically strengthened glass of the present invention, a glass containing an amount of Li ions sufficient for the strength of chemical strengthening is used as the base glass, and the glass for chemical strengthening of the present invention is used. Since the ion absorbing glass is used, a chemically strengthened glass having a predetermined strength and a depth of the compressive stress layer can be obtained.

Further, according to the Li ion-absorbing glass of the present invention, since an inappropriate component is not contained or the amount of the inappropriate component is small, the Li ion having improved performance such as ion exchange rate and chemical durability is provided. An absorbing glass is obtained.

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 4G059 AA08 AC16 HB03 HB13 HB14 HB15 4G062 AA01 BB01 BB09 BB10 DA05 DA06 DB01 DB02 DB03 DB04 DC01 DC02 DC03 DD05 DD06 DE01 DE02 DE03 DE04 DF01 DF02 DF03 EA01 EC04 EC03 EC05 ED02 ED03 ED04 EE01 EE02 EE03 EE04 EF01 EF02 EF03 EF04 EG01 EG02 EG03 FA01 FB01 FB02 FB03 FB04 FC01 FC02 FC03 FC04 FD05 FD06 FE01 FF01 FG01 FG02 FG03 FG04 F03 F01 F02 F01 F03 F01 F02 F01 GC01 GD01 GD02 GD03 GD04 GE01 HH01 HH02 HH03 HH05 HH07 HH08 HH09 HH11 HH13 HH15 HH17 HH20 JJ01 JJ03 JJ04 JJ05 JJ07 JJ10 KK01 KK03 KK03 KK04 KK05 KK07 KK08 KK27 NN33

Claims (9)

[Claims] When a glass containing Li ₂ O is chemically strengthened with a molten salt containing Na ₂ O and / or K ₂ O, the glass contained in the molten salt is used to absorb Li ions eluted in the molten salt. Li-absorption glass for chemical strengthening, which is immersed in water, containing at least 20 wt% of Na ₂ O. 2. When chemically strengthening a glass containing Li ₂ O with a molten salt containing Na ₂ O and / or K ₂ O, the molten salt is used to absorb Li ions eluted in the molten salt. a chemical strengthening for Li absorbing glass is immersed in, 20 to 40 wt% of Na ₂ O, 30 to 60 wt of SiO ₂
% Li-absorbing glass for chemical strengthening mainly containing. 3. When chemically strengthening a glass containing Li ₂ O with a molten salt containing Na ₂ O and / or K ₂ O, the molten salt is used to absorb Li ions eluted in the molten salt. a chemical strengthening for Li absorbing glass is immersed in, 23~40wt% of Na ₂ O, 30 to 60 wt of SiO ₂
% Li-absorbing glass for chemical strengthening mainly containing. 4. When chemically strengthening a glass containing Li ₂ O with a molten salt containing Na ₂ O and / or K ₂ O, the molten salt is used to absorb Li ions eluted in the molten salt. a chemical strengthening for Li absorbing glass is immersed in, 25~40wt% of Na ₂ O, 30 to 60 wt of SiO ₂
%, Mainly containing Li absorption glass for chemical strengthening. 5. The K ₂ O and 0 to 15 wt%, 0 to the Cs ₂ O
15 wt%, MgO 0-15 wt%, CaO 0-1
5 wt%, SrO: 0 to 15 wt%, ZnO: 0 to 15
wt%, the TiO ₂ 0 to 15 wt%, the Nb ₂ O ₅ 0 to 1
5wt%, Ta ₂ O ₅ and 0 to 15 wt%, the La ₂ O ₃ 0 to
15 wt%, 0 to 15 wt% of Y ₂ O _3, the Yb ₂ O ₃ 0 to
15 wt%, 0 to 15 wt% of Gd ₂ O _3, the Al ₂ O ₃ 0
１５15 wt%, WO ₃ ０〜0-15 wt%, Sb ₂ O ₃ ０0
~15wt%, As ₂ O ₃ and 0 to 15 wt%, a ZrO ₂ 0~15wt%, 0~15wt% of TeO _2, Bi ₂ O ₃
0~ 0~15wt, B ₂ O ₃ and 0~4wt%, of BaO and
The chemical strengthening L according to any one of claims 1 to 4, comprising 4 wt% and 0 to 3 wt% of PbO.
i absorption glass. 6. The chemical strengthening Li according to claim 1, wherein one or more components of B ₂ O ₃ , PbO, BaO and Li ₂ O are not substantially contained. Absorbing glass. 7. A glass containing Li ions in an amount capable of sufficiently obtaining the strength of chemical strengthening as a base glass.
The chemical strengthening of the base glass is carried out by immersing them in a molten salt containing Na ₂ O and / or K ₂ O by using the Li absorption glass for chemical strengthening described in any of the above items 6 to 6. Manufacturing method of chemically strengthened glass. 8. Li_TwoIon exchange glass containing O
To absorb the Li ions eluted in the molten salt
In the Li absorption glass immersed in the molten salt, Na_TwoO containing 20 wt% or more, SiO_Two, P_TwoO_FiveAnd GeO_TwoAny of 30 to
Containing 60 wt% and K_Two0 to 15 wt% O, Cs_Two0 to 15 wt% of O, M
gO 0-15 wt%, CaO 0-15 wt%, Sr
0 to 15 wt% of O, 0 to 15 wt% of ZnO, TiO
_Two0 to 15 wt%, Nb_TwoO_Five0 to 15 wt%, Ta_Two
O_FiveFrom 0 to 15 wt%, La_TwoO_ThreeFrom 0 to 15 wt%, Y_Two
O_ThreeFrom 0 to 15 wt%, Yb_TwoO_Three0 to 15 wt%, G
d_TwoO_ThreeFrom 0 to 15 wt%, Al_TwoO_ThreeFrom 0 to 15 wt%,
WO_Three0 to 15 wt%, Sb_TwoO_ThreeFrom 0 to 15 wt%,
As_TwoO_ThreeFrom 0 to 15 wt%, ZrO_Two0 to 15 wt
%, TeO_Two0 to 15 wt%, Bi_TwoO_Three0-15w
t, B _TwoO_Three0-4 wt%, BaO 0-4 wt%, P
characterized by containing 0 to 3 wt% of bO.
Collecting glass. 9. The Li-absorbing glass according to claim 8, wherein one or more components of B ₂ O ₃ , PbO, BaO and Li ₂ O are not substantially contained.