JP2013095638A - Glass production apparatus and glass production method using the apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass production apparatus which can prevent the occurrence of bubbles in molten glass.SOLUTION: The glass production apparatus 1 includes a glass producing container 10, and a water content adjusting mechanism 50. The glass producing container 10 has a container body 11 and an electron donor 12. The container body 11 is composed of a noble metal or an alloy containing the noble metal. The container body 11 has an inner surface 11b in contact with glass melt 14 and an outer surface 11c not in contact with the glass melt 14. The electron donor 12 is connected electrically to the outer surface 11c of the container body 11. The electron donor 12 contains an electron donating substance which donates electrons to the container body 11 at a use temperature. The water content adjusting mechanism 50 adjusts the water content in an atmosphere with the electron donor 12 arranged to be 1.0-5.0 mass%.

Description

  The present invention relates to a glass manufacturing apparatus and a glass manufacturing method using the same.

  Conventionally, as an industrial manufacturing method of glass, a method including a step of melting a glass raw material, a step of refining molten glass, and a step of forming a glass after refining is generally used. Examples of the container for producing glass include a container formed of a refractory and a container formed of Pt or an alloy containing Pt.

  For example, when manufacturing glass such as window glass that does not require high quality with respect to foreign matters and bubbles, a refractory container may be used as a glass manufacturing container. When manufacturing glass that requires high quality with respect to foreign matters and bubbles, such as display substrate glass for displays, etc., it contains noble metals such as Pt, Ir, and Rh, and noble metals such as Pt, Ir, and Rh. An alloy container is generally used. The reason for this is that when a container made of a noble metal such as Pt, Ir or Rh or an alloy containing a noble metal (hereinafter referred to as a “noble metal container”) is used for the production of glass, foreign matter from the container is contained in the molten glass. It is because it is hard to mix.

  However, when a noble metal container is used for glass production, bubbles due to moisture in the glass may be generated on the surface of the noble metal container on the molten glass side. The reason why this bubble is generated is that oxygen generated by the decomposition of water contained in the glass passes through the noble metal container and is released to the outside, so that the oxygen concentration of the molten glass located near the surface of the noble metal container It is thought that this is because of an increase. That is, while hydrogen gas generated by the reaction shown in the following formula (1) permeates the noble metal container and is released to the outside, oxygen that does not permeate the noble metal container remains in the molten glass located near the surface of the noble metal container. By doing so, it is considered that the oxygen concentration of the molten glass located near the surface of the noble metal container increases and bubbles are generated.

OH ⁻ → 1 / 2O ₂ + 1 / 2H ₂ + e ⁻ (1)

  In view of such a problem, for example, in Patent Document 1, an electron donor made of an electron-donating substance that donates electrons to the container body at the operating temperature is electrically applied to the outer surface of the container body made of a noble metal or an alloy containing a noble metal. It has been proposed to suppress the generation of bubbles by connecting them electrically.

JP 2011-068550 A

  However, even when the production container described in Patent Document 1 is used, bubbles may be generated in the glass melt.

  The main object of the present invention is to provide a glass manufacturing apparatus in which bubbles are not easily generated in molten glass.

  The glass manufacturing apparatus according to the present invention includes a glass manufacturing container and a moisture content adjusting mechanism. The container for glass production includes a container body and an electron donor. The container body is made of a noble metal or an alloy containing a noble metal. The container body has an inner surface that contacts the glass melt and an outer surface that does not contact the glass melt. The electron donor is electrically connected to the outer surface of the container body. The electron donor includes an electron donating substance that donates electrons to the container body at the use temperature. The moisture content adjusting mechanism sets the moisture content in the atmosphere in which the electron donor is arranged to 1.0% by mass to 5.0% by mass.

  In the present invention, the “glass manufacturing container” means a member having an inner surface in contact with the glass melt and an outer surface not in contact with the glass melt. For this reason, the “glass manufacturing container” includes a member capable of storing glass melt (a container in a narrow sense), a pipe for transporting the glass melt, a molding member, and the like. Here, the “forming member” refers to a member used for forming a glass melt into a member having a predetermined shape. Accordingly, the “molding member” includes a molding sleeve, a bowl-shaped molded body used in the downdraw method, a nozzle, and the like.

  The water content can be calculated by the following equation.

  Water content (%) = 62.1 × average vapor pressure / (average atmospheric pressure−average vapor pressure)

  The moisture content adjusting mechanism preferably has an enclosing member that encloses at least a portion of the glass manufacturing container in which the electron donor is arranged. The moisture content adjusting mechanism may be constituted by an enclosing member.

  It is preferable that the electron donating substance donates electrons to the container body in at least a part of the temperature range of 500 ° C to 1800 ° C.

  The Fermi level of the electron donating substance is preferably located at an energy level higher than the Fermi level of the container body.

  The electron donating substance is preferably made of an oxide containing one or more metals selected from the group consisting of Zn, Mg, Ti, Sn and Al.

  The container body may be made of Pt, Ir, Rh or an alloy containing at least one of Pt, Ir, Rh.

  The electron donor is in contact with a portion of the outer surface of the container body, and the outer surface of the container body may have a portion that is not in contact with the electron donor.

  The glass manufacturing apparatus according to the present invention preferably further includes an electron acceptor that is electrically connected to the electron donor.

  The Fermi level of the electron acceptor is preferably located at an energy level lower than the Fermi level of the electron donating substance.

  The electron acceptor is preferably an oxide containing one or more metals selected from the group consisting of Cu, Ni, Co, Mn, and Li.

  The electron acceptor is preferably NiO doped with Li.

  In the glass manufacturing method according to the present invention, glass is manufactured using the glass manufacturing apparatus according to the present invention.

  The β-OH value of the glass may be 0.3 / mm or more.

  In the present invention, the “β-OH value” is an index indicating the amount of water contained in the glass, and is represented by the following formula.

(Β-OH value) = (1 / X) log 10 (T ₁ / T ₂ )
However,
X: Glass thickness (mm),
T ₁ : transmittance (%) at a reference wavelength of 3846 cm ⁻¹ (= 2600 nm),
T ₂ : Minimal transmittance (%) in the vicinity of hydroxyl group absorption wavelength 3600 cm ⁻¹ (= 2800 nm) (3400 cm ^{−1 to} 3700 cm ⁻¹ ),
It is.

  The glass may be a display glass substrate.

It is a typical lineblock diagram of the glass manufacture device concerning one embodiment of the present invention. It is a schematic sectional drawing of the container for glass manufacture in one Embodiment of this invention. 1 is a schematic cross-sectional view of a glass melt conveying pipe in an embodiment of the present invention. It is a schematic sectional drawing of the container for glass manufacture in a 1st modification. It is a schematic cross-sectional view of a glass melt conveying pipe in a first modification. It is a schematic sectional drawing of the container for glass manufacture in a 2nd modification. It is schematic-drawing sectional drawing of the container for glass manufacture in a 3rd modification. In a 1st experiment example, it is a plane photograph of glass in case water content in atmosphere is 0.5 mass%. In a 1st experiment example, it is a plane photograph of glass in case water content in atmosphere is 1.5 mass%. It is a schematic sectional drawing for demonstrating the 2nd experiment example. In the 2nd experiment example, it is a plane photograph of glass in case moisture content in atmosphere is 0.5 mass%. In the 2nd experiment example, it is a plane photograph of glass in case moisture content in atmosphere is 1.5 mass%.

  Hereinafter, although an example of the preferable form which implemented this invention is demonstrated, this invention is not limited to the following embodiment at all.

  FIG. 1 is a schematic configuration diagram of a glass manufacturing apparatus 1 according to the present embodiment. The glass manufacturing apparatus 1 is an apparatus for forming a glass substrate for display by the overflow downdraw method.

  The glass manufacturing apparatus 1 includes a melting container 31, a fining container 32, a stirring container 33, a pot 34, a forming member 35 (forming member), and a heating element (not shown). The melting container 31 is a container for melting the charged glass raw material (batch). The melting container 31 is connected to the fining container 32 by a first connection passage 36 a formed inside the first connection member 36. The clarification container 32 is a container for clarifying the glass melt shared from the melting container 31. The clarification container 32 is connected to the agitation container 33 by a second connection passage 37 a formed inside the second connection member 37. The stirring container 33 is a container for stirring and homogenizing the clarified glass melt. The stirring container 33 is connected to the molding member 35 by a third connection passage 38 a formed in the third connection member 38, a pot 34, and a pipe 39.

  In this embodiment, at least one of the containers 31 to 33, the pot 34, the connection members 36 to 38, the pipe 39, and the molding member 35 is the glass manufacturing container 10 shown in FIG. 2 or the glass melt transfer shown in FIG. The pipe 20 is used. Among the containers 31 to 33, the pot 34, the connecting members 36 to 38, the pipe 39, and the molding member 35, the containers 32 and 33, the pot 34, the connecting member 38, the pipe 39, and the parts disposed after the portion to be clarified are used. Of the forming member 35, a member formed using a noble metal or a noble metal alloy is preferably constituted by the glass manufacturing container 10 or the glass melt conveying pipe 20.

  As shown in FIG. 2, the glass manufacturing container 10 includes a container body 11, an electron donor 12, and an electron acceptor 13. The glass manufacturing container 10 is disposed in a recess 15 a formed in the refractory 15. Specifically, the container body 11 is disposed in the recess 15a. Between the container main body 11 and the refractory 15, an electron donor 12 and an electron acceptor 13 are arranged in this order from the container main body 11 side.

  The glass manufacturing container 10 of the present embodiment is provided with an AC power source or a separate heating body, and the glass manufacturing container 10 is heated directly by the AC power source or by a separate heating body. is there.

  The container body 11 is made of a noble metal or an alloy containing a noble metal. Specific examples of the noble metal include Pt, Au, Ir, Rh and the like. Examples of the alloy including a noble metal include a Pt—Rh alloy, a Pt—Au alloy, an Ir—Rh alloy, and a Pt—Ir alloy. Especially, it is preferable that the container main body 11 is formed with the alloy containing Pt or Pt. This is because Pt or an alloy containing Pt has a relatively high strength at high temperatures and little elution into molten glass.

  Further, the container main body 11 may be doped with other elements such as Zr and Zr oxides and other elements such as metal oxides for the purpose of improving rigidity and strength. For example, the container body 11 may be made of Pt doped with Zr.

  In this embodiment, the container main body 11 is formed in a bowl shape, and the container main body 11 is formed with a recess 11a in which the glass melt 14 is stored. That is, the container main body 11 has an inner surface 11 b that contacts the glass melt 14 and an outer surface 11 c that does not contact the glass melt 14.

  An electron donor 12 is electrically connected to the outer surface 11 c of the container body 11. Specifically, in this embodiment, the electron donor 12 is provided so that it may contact directly with the outer surface 11c of the container main body 11. FIG. More specifically, the electron donor 12 is arrange | positioned so that the whole surface of the part located in the outer side of the recessed part 11a among the outer surfaces 11c of the container main body 11 may be contacted.

Here, the electron donor 12 is an electron that donates electrons to the container body 11 in a temperature range of 500 ° C. to 1800 ° C., preferably in at least a part of the temperature range of 1000 ° C. to 1800 ° C. It consists of a donating substance. That is, the electron donor 12 is made of an electron donating substance that donates electrons to the container body 11 when heated to a temperature at which glass is melted. For this reason, when glass is melted using the glass production container 10 of the present embodiment, electrons (e ⁻ ) are supplied from the electron donor 12 to the container body 11 during the melting of the glass. The progression of the following formula (1) that generates Therefore, generation of oxygen bubbles can be suppressed.

OH ⁻ → 1 / 2O ₂ + 1 / 2H ₂ + e ⁻ (1)

  In this embodiment, since the container main body 11 is made of a noble metal or an alloy containing a noble metal, the container main body 11 has conductivity. For this reason, the electrons supplied from the electron donor 12 to the container body 11 can freely move within the container body 11. Therefore, if electrons can be supplied to a part of the container body 11, the electron concentration in the entire container body 11 can be increased. Therefore, when the progress of the above formula (1) is suppressed by supplying electrons, the electron donor 12 may be electrically connected to at least a part of the outer surface 11c of the container body 11. For example, the outer surface 11c of the container body 11 may have a portion where the electron donor 12 is not electrically connected. Therefore, the glass manufacturing container 10 of the present embodiment is easy to produce.

  Also, when forming a barrier coating layer on the outer surface of the container body, if the barrier coating layer is cracked or the barrier coating layer is peeled off from the container body, the generation of bubbles cannot be sufficiently suppressed. In the glass manufacturing container 10 according to the embodiment, even when a portion not in contact with the electron donor 12 is generated on the outer surface 11c of the container main body 11, the generation of bubbles can be effectively suppressed.

  In the present embodiment, the electron donating substance is not particularly limited as long as it is a substance that can supply electrons to the container body 11 at the melting temperature of the glass. The electron donating substance may be, for example, a metal or an oxide. The electron donor 12 may be a ceramic such as an oxide ceramic.

  Further, the electron donor 12 may be a particle, or may be a sintered film in the case of a ceramic, for example. In the present embodiment, since the outer surface 11c of the container body 11 does not need to be completely covered with the electron donor 12, the effect of suppressing the generation of bubbles is sufficient even if the electron donor 12 is a particle. To be played.

  In the present embodiment, specifically, a portion of the outer surface 11c of the container main body 11 that is constituted by a layer formed of particles made of an electron donating substance is located outside the recess 11a. It is filled so that it may contact the whole surface. In the case of this configuration, the electron donor 12 can be easily arranged regardless of the shape and size of the container body 11.

  The electron-donating substance may be, for example, an n-type ceramic such as an n-type oxide ceramic in which the Fermi level is located at an energy level higher than the Fermi level of the container body 11.

Preferable specific examples of the electron donating substance include an oxide containing one or more metals selected from the group consisting of Zn, Mg, Ti, Sn, and Al. More specifically, examples of the electron donating substance include ZnO, SnO ₂ , TiO ₂ , SrTiO _{3 and the} like. Among these, more preferable electron donating substances include ZnO ceramics, which are a kind of thermally excited n-type intrinsic semiconductor ceramics, and ZnO ceramics doped with metals such as Al.

  In the present embodiment, the electron acceptor 13 is further provided so as to be electrically connected to the electron donor 12. Specifically, the electron acceptor 13 composed of a layer composed of particles composed of an electron accepting substance is disposed so as to contact the electron donor 12. The electron acceptor 13 is provided outside the electron donor 12 so as not to come into contact with a portion located outside the recess 11 a of the container body 11.

Thus, by arranging the electron acceptor 13 so as to be electrically connected to the electron donor 12, it is caused by water and OH ⁻ ions in the glass melt as supported by the following examples. Generation | occurrence | production of a bubble can be suppressed effectively.

  The electron acceptor 13 is preferably such that the Fermi level is located at an energy level lower than the Fermi level of the electron donating substance. The electron acceptor 13 may be a p-type ceramic such as a p-type oxide ceramic that exhibits p-type characteristics at room temperature, that is, 25 ° C., for example. Specifically, the electron acceptor 13 may be a p-type oxide ceramic made of an oxide containing one or more metals selected from the group consisting of Cu, Ni, Co, Mn and Li, for example. . Among these, the electron acceptor 13 is preferably NiO doped with Li.

The electron acceptor 13 may be a p-type ceramic such as a p-type oxide ceramic, for example. Specifically, the electron acceptor 13 may be a p-type oxide ceramic made of an oxide containing one or more metals selected from the group consisting of Cu, Ni, Co, Mn and Li, for example. . More specifically, examples of the electron acceptor 13 include, for example, NiO doped with Li, CoO doped with Li, FeO doped with Li, MnO doped with Li, and Ba doped. Examples include Bi ₂ O ₃ , Cr ₂ O ₃ doped with Mg, LaCrO ₃ doped with Sr, LaMnO ₃ Cu ₂ O doped with Sr, CuAlO ₂ , NaCo ₂ O ₄ , CaMnO ₃ , and the like. Among these, the electron acceptor 13 is preferably NiO doped with Li. In that case, for example, even if the electron acceptor 13 accidentally contacts a noble metal container such as Pt during construction, it is difficult to promote the generation of bubbles.

  The electron acceptor 13 may be disposed so as to be in direct contact with the container body 11. However, since the member that donates electrons to the container body 11 is the electron donor 12, The contact area with the body 12 is increased, and the electron acceptor 13 is preferably disposed so as not to directly contact the container body 11.

  Further, the glass melt conveying pipe 20 is also arranged so that the electron donor 12 covers the cylindrical container main body 11 in the same manner as the glass manufacturing container 10. Therefore, generation | occurrence | production of a bubble can be suppressed also in the pipe 20 for glass melt conveyance. Further, an electron acceptor 13 is disposed outside the electron donor 12 so as to cover the electron donor 12. Therefore, generation of bubbles can be more effectively suppressed in the glass melt conveying pipe 20.

  Furthermore, in the glass manufacturing apparatus 1, the moisture content in the atmosphere in which the electron donor 12 of the glass manufacturing container 10 and the glass melt conveying pipe 20 is arranged is 1.0% by mass to 5.0% by mass. A moisture content adjusting mechanism 50 is provided. For this reason, generation | occurrence | production of the bubble in the container 10 for glass manufacture and the pipe 20 for glass melt conveyance is suppressed more effectively. Accordingly, it is possible to produce a glass in which the remaining foam is suppressed.

  The reason why the generation of bubbles can be suppressed by providing the moisture content adjusting mechanism 50 and setting the moisture content in the atmosphere in which the electron donor 12 is arranged to be 1.0% by mass to 5.0% by mass is as follows. It is conceivable that moisture acts on the electron donor 12 to increase the electron acceptability of the electron donor 12.

  The moisture content adjusting mechanism 50 is not particularly limited as long as it can control the moisture content in the atmosphere in which the electron donor 12 is disposed. For example, the moisture content control mechanism 50 may include an enclosing member 51 that encloses at least a portion of the glass manufacturing container 10 where the electron donor 12 is disposed. The moisture content control mechanism 50 may be configured by only the surrounding member 51, or may include the surrounding member 51 and a moisture supply mechanism 52 that supplies moisture to the inside of the surrounding member 51. In the present embodiment, the surrounding member 51 specifically surrounds the pot 34, the connecting member 38, and the pipe 39.

  The effect which can suppress generation | occurrence | production of said bubble is acquired when melting what kind of glass. Therefore, the glass manufacturing container 10 of the present embodiment is suitably used for melting any kind of glass. The glass manufacturing container 10 is suitably used for melting, for example, silicate glass, borosilicate glass, borophosphate glass, phosphate glass, and the like. Among them, when producing a glass having a β-OH value of 0.3 / mm or more, bubbles are easily generated. Therefore, the glass production container 10 of the present embodiment has a β-OH value of 0.3 / mm. It is suitably used for the production of glass that is at least mm. Furthermore, the glass production container 10 of the present embodiment is more suitably applied to the production of glass having a β-OH value of 0.35 / mm or more, more preferably 0.4 / mm or more.

  Moreover, when manufacturing the glass substrate for a display, since it is strongly desired that the bubble does not remain | survive in glass, the container 10 for glass manufacture of this embodiment is used suitably by manufacture of the glass substrate for a display. .

  Hereinafter, modifications of the glass manufacturing container will be described. In the following description of the modified examples, members having substantially the same functions as those of the above-described embodiment are referred to by common reference numerals, and description thereof is omitted.

(First modification)
FIG. 4 is a schematic cross-sectional view of a glass manufacturing container in a first modification. FIG. 5 is a schematic cross-sectional view of a glass melt conveying pipe in the first modification.

In the above embodiment, the case where the electron acceptor 13 is provided has been described. However, in the first modified example, as shown in FIGS. 4 and 5, only the electron donor 12 is provided, and the electron acceptor 13 is provided. The receptor 13 is not provided. Even in this case, generation of bubbles due to water and OH ⁻ ions in the glass melt can be effectively suppressed.

(Second and third modifications)
FIG. 6 is a schematic cross-sectional view of a glass manufacturing container in a second modification. FIG. 7 is a schematic cross-sectional view of a glass manufacturing container in a third modification.

In the above embodiment, the case where the electron donor 12 is brought into contact with the entire outer surface of the concave portion 11a of the container body 11 has been described. However, the present invention is not limited to this configuration. For example, in the second modification, as shown in FIG. 6, the electron donor 12 is brought into contact only with the outside in the vicinity of the contact portion with the interface of the glass melt 14 of the container body 11. In the third modified example, as shown in FIG. 7, the electron donor 12 is brought into contact only with the outside of the bottom of the container body 11. Also in such a structure, generation | occurrence | production of the bubble resulting from the water in a glass melt and OH < ^- > ion can be suppressed effectively.

  Which part of the container body 11 is brought into contact with the electron donor 12 can be appropriately determined depending on which part of the inner surface 11b of the container body 11 is likely to generate bubbles.

  Hereinafter, the present invention will be described in more detail. However, the present invention is not limited to the following examples, and can be appropriately modified and implemented without departing from the scope of the present invention.

(First Experiment Example)
First, an alkali-free glass having a β-OH value of 0.55 / mm is arranged on a Pt plate having a thickness of 0.05 mm, and the moisture content in the atmosphere is set to 0.5% by mass or 1.5%. It was made into the mass%, and it was left to stand at 1550 degreeC for 15 minutes. Then, it cooled to room temperature and confirmed the bubble in glass visually. FIG. 8 shows a photograph of the glass when the moisture content in the atmosphere is 0.5 mass%. FIG. 9 shows a photograph of the glass when the moisture content in the atmosphere is 1.5% by mass.

  8 and 9, it can be seen that many bubbles are generated regardless of the moisture content in the atmosphere when the electron donor is not brought into contact with the Pt container. Moreover, the generation | occurrence | production condition of the bubble was substantially the same when the moisture content in atmosphere was 0.5 mass%, and when the moisture content in atmosphere was 1.5 mass%. From this, it can be seen that, when the electron donor is not electrically connected to the Pt container, the generation of bubbles cannot be suppressed even if the moisture content in the atmosphere is changed.

(Second experiment example)
As shown in FIG. 10, an electron donor 12 made of ZnO powder in which Al is dissolved is disposed on an electron acceptor 13 made of NiO powder in which Li is dissolved, and further, The Pt container 40 was arranged on the top. Then, on the Pt container 40, an alkali-free glass 41 having a β-OH value of 0.55 / mm, which is substantially the same as the alkali-free glass used in the first experimental example, is arranged. The water content was set to 0.5% or 1.5%, and the mixture was left at 1550 ° C. for 15 minutes. Then, it cooled to room temperature and confirmed the bubble in glass visually. FIG. 11 shows a photograph of the glass when the moisture content in the atmosphere is 0.5 mass%. FIG. 12 shows a photograph of the glass when the moisture content in the atmosphere is 1.5% by mass.

  First, it can be seen from the comparison between FIG. 8 and FIG. 11 that the generation of bubbles can be suppressed by arranging the electron donor 12 and the electron acceptor 13.

  Moreover, it turns out that generation | occurrence | production of a bubble can be suppressed more effectively by making content of the water | moisture content in atmosphere into 1.5 mass% or more from the comparison with FIG. 11 and FIG.

DESCRIPTION OF SYMBOLS 1 ... Glass manufacturing apparatus 10 ... Glass manufacturing container 11 ... Container main body 11a ... Concave 11b ... Inner surface 11c ... Outer surface 12 ... Electron donor 13 ... Electron acceptor 14 ... Glass melt 15 ... Refractory 15a ... Concave 20 ... Glass melt conveying pipe 31 ... Melting container 32 ... Clarification container 33 ... Stirring container 34 ... Pot 35 ... Forming member 36 ... First connecting member 36a ... First connecting passage 37 ... Second connecting member 37a ... second connection passage 38 ... third connection member 38a ... third connection passage 39 ... pipe 40 ... Pt container 50 ... moisture content adjusting mechanism 51 ... surrounding member 52 ... moisture supply mechanism

Claims (14)

  A container body made of a noble metal or an alloy containing a noble metal, having an inner surface in contact with the glass melt and an outer surface not in contact with the glass melt, electrically connected to the outer surface of the container body and used A glass production container comprising an electron donor containing an electron donating substance that donates electrons to the container main body at a temperature, and a water content in an atmosphere in which the electron donor is arranged is 1.0% by mass. A glass manufacturing apparatus provided with the moisture content adjustment mechanism which is -5.0 mass%.   The said moisture content adjustment mechanism is a glass manufacturing apparatus of Claim 1 which has the surrounding member which surrounds the part by which the said electron donor was distribute | arranged at least of the said glass manufacturing container.   3. The glass manufacturing apparatus according to claim 1, wherein the electron donating substance donates electrons to the container body in at least a part of a temperature range of 500 ° C. to 1800 ° C. 4.   The glass manufacturing apparatus according to any one of claims 1 to 3, wherein a Fermi level of the electron donating substance is located at an energy level higher than a Fermi level of the container body.   The glass production according to any one of claims 1 to 4, wherein the electron donating substance is made of an oxide containing one or more metals selected from the group consisting of Zn, Mg, Ti, Sn, and Al. apparatus.   The said container main body is a glass manufacturing apparatus as described in any one of Claims 1-5 which consists of an alloy containing at least 1 type of Pt, Ir, Rh or Pt, Ir, Rh.   The electron donor is in contact with a part of the outer surface of the container body, and the outer surface of the container body has a part not in contact with the electron donor. The glass manufacturing apparatus according to one item.   The glass manufacturing apparatus according to claim 1, further comprising an electron acceptor electrically connected to the electron donor.   The glass manufacturing apparatus according to claim 8, wherein a Fermi level of the electron acceptor is located at an energy level lower than a Fermi level of the electron donating substance.   The glass manufacturing apparatus according to claim 8 or 9, wherein the electron acceptor is an oxide containing one or more metals selected from the group consisting of Cu, Ni, Co, Mn, and Li.   The glass manufacturing apparatus according to claim 8 or 9, wherein the electron acceptor is NiO doped with Li.   The manufacturing method of the glass using the glass manufacturing apparatus as described in any one of Claims 1-11.   The manufacturing method of the glass of Claim 12 whose (beta) -OH value of glass is 0.3 / mm or more.   The method for producing glass according to claim 12 or 13, wherein the glass is a glass substrate for display.