JP5796731B2 - Glass article manufacturing apparatus and glass article manufacturing method - Google Patents

Description

  The present invention relates to a technique for improving a glass article manufacturing apparatus for manufacturing a glass article such as a glass plate.

  As is well known, when manufacturing a glass article such as a glass plate, for example, a melting furnace serving as a supply source of molten glass, and a supply channel for supplying the molten glass flowing out of the melting furnace toward the downstream side, , And a glass article manufacturing apparatus including a forming portion that communicates with the downstream end of the supply flow path.

  In this kind of glass article manufacturing apparatus, the walls of the melting kiln and the flow path for supply are made of metal members made of platinum or a platinum alloy because of their chemical and physical stability at high temperatures, The wall portion is made of a brick such as a zircon refractory having the above metal member (plate-like body) attached to the inner surface side.

  On the other hand, in recent years, as a material of a metal member used on the wall portion of the melting kiln or supply flow path or the inner surface thereof, chemical and physical stability at a higher temperature than platinum or platinum alloy. Iridium having the property has attracted attention.

  However, iridium has a high melting point of 2400 ° C. or higher, but is easily oxidized in an oxygen atmosphere such as in the air, and the oxide volatilizes at 1060 ° C.

  For such a problem, for example, in Patent Documents 1 and 2, a metal layer containing at least platinum and iridium is provided on one surface of a structure made of iridium or an iridium alloy, and platinum or a platinum alloy is provided on this surface. The thing provided with the metal layer which consists of is disclosed.

JP 2002-167654 A JP 2002-180268 A

By the way, the three metal layers disclosed in Patent Documents 1 and 2 are formed of an alloy containing an intermediate layer of platinum and iridium. It is made of a different metal material. In this case, platinum has a higher thermal expansion coefficient than iridium (linear expansion coefficient: platinum 9.1 × 10 ⁻⁶ / ° C., iridium 6.8 × 10 ⁻⁶ / ° C.), and the difference is considerably large.

  Therefore, in the three metal layers disclosed in Patent Documents 1 and 2, when heat is applied, the platinum or platinum alloy layer expands more than the iridium or iridium alloy layer, and the iridium or iridium alloy layer Deformation that bends to the side occurs. For this reason, when these three metal layers are used in the wall of a melting furnace or a supply flow path, the three metal layers are deformed by the heat of the molten glass, resulting in damage or the like. However, durability may be reduced.

  This invention makes it a technical subject to improve the durability of the wall part of the melting kiln used for a glass article manufacturing apparatus and the flow path for supply in view of the said situation.

The glass article manufacturing apparatus of the present invention for solving the above problems includes a melting kiln serving as a molten glass supply source, a supply flow channel for supplying the molten glass flowing out of the melting kiln toward the downstream side, In a glass article manufacturing apparatus including a molding unit that communicates with a downstream end of a supply channel, a wall portion that forms at least a part in an upstream / downstream direction of the melting furnace and the supply channel, or an inner surface of the wall portion The side part is composed of a metal member containing platinum and iridium, and the metal member has a higher platinum content and iridium content at both ends than at the center in the thickness direction. rate is small at each of both ends of its thickness direction, towards the content of platinum than the content of iridium is rather large, the metallic member, the both end portions from the central portion in the thickness direction Of platinum gradually toward Yes rate is marked particular feature large and iridium content decreases.

  According to such a configuration, there is a clear difference between the content ratio of platinum and the content ratio of iridium in the central portion and both end portions in the thickness direction of the metal member, whereas in the thickness direction Since the platinum content is greater than the iridium content in the one end and the other end, it is possible to avoid a large difference in material between the one end and the other end. Therefore, it is possible to make the thermal expansion coefficients equal at both ends in the thickness direction of the metal member, and to suppress a large deformation of the metal member that is bent in one of the thickness directions. it can. This avoids the inconvenience that this metallic member is damaged due to deformation due to the heat of the molten glass, and it is possible to improve the durability of the wall portion, and to smoothly distribute the molten glass. Can be secured.

  Moreover, since the both ends of the iridium content in the metal member are smaller than the central portion in the thickness direction, the metal member can be prevented from being worn out by volatilization of iridium from the front and back surfaces of the metal member. Also from this, the durability of the wall portion can be improved.

Said structure WHEREIN: It is preferable that the content rate of iridium is 10% or less in the said both ends .

Said structure WHEREIN: It is preferable that the content rate of platinum is 70% or more in the said both ends .

In the above configuration, the surface of each of said end portions, it is preferred components and their proportions are identical to each other.

In this way, the thermal expansion coefficient at both ends become substantially equal, the effect of improving the durability of the wall portion can be reliably enjoyed.

  In any one of the configurations described above, the metal member is preferably a tubular body that forms the wall portion.

  In this way, since it is possible to suppress undue deformation of the tubular body due to the difference in thermal expansion between the inner surface side and the outer surface side of the tubular body, the flow of the molten glass flowing through the internal passage of the tubular body. Can be avoided.

  In any one of the configurations described above, the metal member is preferably a plate-like body that forms at least an inner surface side portion of the wall portion that contacts the molten glass.

  This makes it difficult to cause undue deformation due to the difference in thermal expansion in the thickness direction of the plate-like body, even though the inner surface side portion of the wall portion is formed of a thin plate-like body. Therefore, also in this case, the molten glass can smoothly flow through the passage formed by the plate-like body.

  The glass article manufacturing method of the present invention for solving the above-described problems is characterized in that a glass article is manufactured using the glass article manufacturing apparatus described above.

  Since the configuration of this method is substantially the same as the configuration of the glass article manufacturing apparatus according to the present invention described above, the operational effects thereof are substantially the same as those already described for the apparatus.

  As described above, according to the present invention, it is possible to suppress deformation of the wall portion of the melting furnace and the supply flow channel used in the glass article manufacturing apparatus, so that the durability of the molten glass can be reduced without causing any obstacle to the distribution of the molten glass. Can be improved.

It is a plane sectional view showing an example of 1 composition of a glass article manufacture device concerning an embodiment of the present invention. It is AA arrow sectional drawing of FIG. It is a figure which illustrates the content rate of iridium and platinum in the thickness direction of a wall part.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  First, based on FIG. 1, the whole structure in the planar view of the glass article manufacturing apparatus 1 which concerns on embodiment of this invention is demonstrated. The glass article manufacturing apparatus 1 includes a substantially rectangular melting furnace 2 serving as a molten glass supply source, a distribution unit (clarification tank) 3 communicated with an outlet 2 a of the melting furnace 2, and a downstream of the distribution unit 3. A plurality of branch flow paths 4 communicated with the side end portions, and the downstream ends of these branch flow paths 4 respectively communicate with the molding portion 5. The number of the branch flow paths 4 is two in the illustrated example, but may be three or more, or may be a single flow path that does not branch. Moreover, the melting kiln 2 may be arranged in a state where two or more are connected in series or in parallel from the upstream side to the downstream side, for example.

  Further, the melting furnace 2 has a bottom wall 21, side walls 22 to 25, and an arched ceiling wall (not shown) covering the entire upper area thereof, and an outlet 2 a at the center in the width direction of the downstream side wall 24. Is formed, and the melting furnace 2 and the distribution unit 3 communicate with each other through a narrow outflow passage 6 having the outlet 2a at the upstream end. The distribution unit 3 includes a bottom wall 31, side walls 32 to 35, and an arched ceiling wall (not shown) that covers the entire area above the bottom wall 31, and the outflow path 6 includes a bottom wall 61, side walls 62, 63, And an arched ceiling wall (not shown) covering the entire upper area thereof. The bottom wall, the side wall, and the ceiling wall (wall part) in the melting furnace 2, the distribution part 3, and the outflow channel 6 are made of bricks such as zircon refractories.

  The downstream end of the outflow passage 6 is opened at the central portion in the width direction of the upstream side wall 32 in the distribution unit 3, and the downstream side wall 34 in the distribution unit 3 faces the downstream side at a plurality of positions in the width direction. The upstream ends of the plurality of branched flow paths 4 that are extended are opened. The plurality of branch channels 4 are arranged in parallel to each other, and all of the individual branch channels 4 extend linearly. In the present embodiment, the supply flow path 7 for supplying molten glass from the melting furnace 2 to the molding unit 5 is constituted by the outflow path 6, the distribution section 3, and the branch flow path 4, and these branch flow paths 4 are: It is comprised by the tubular body.

  As shown in FIG. 2, the peripheral wall 41 of the tubular body which comprises the branch flow path 4 is comprised with the metal member, This metal member is a 3 layer structure, and is laminated | stacked in the thickness direction 3 It consists of layers L1-L3. The layers L1, L3 on both ends in the thickness direction of the peripheral wall 41 are made of platinum or a platinum alloy, and the center layer L2 is made of iridium or an iridium alloy. The platinum content is higher in the layers L1 and L3 on both ends than the central layer L2, and the iridium content is lower in the layers L1 and L3 on both ends than the central layer L2. In each of the layers L1 and L3 on both ends, the platinum content is higher than the iridium content. In the present embodiment, the thicknesses, the components, and the ratios of the layers L1 and L3 on both ends are the same, but the present invention is not limited to this.

  The layer L1 inside the peripheral wall 41 is in contact with the molten glass g, while the layer L3 outside the peripheral wall 41 is not in contact with the molten glass g.

  When a platinum alloy is used for the layers L1 and L3 on both ends, the platinum alloy is preferably an alloy containing at least one of iridium, rhodium, gold, palladium, and ruthenium. On the other hand, when an iridium alloy is used for the central layer L2, the iridium alloy is preferably an alloy containing at least one of platinum, rhodium, gold, palladium, and ruthenium.

  The thickness of each of the three layers L1 to L3 is preferably 10 to 1000 μm, particularly preferably 100 to 500 μm. If this thickness is less than 10 μm, the chemical and physical properties of the layer may not be sufficiently exhibited, and if it exceeds 1000 μm, the production cost may increase. The thickness difference between the layers L1 and L3 on both ends is preferably 0 to 500 μm, 0 to 300 μm, 0 to 200 μm, 0 to 100 μm, particularly 0 to 90 μm, and most preferably 0 μm. It is. When this difference exceeds 500 μm, the influence due to the difference in thermal expansion coefficient between the layer L1 and the layer L3 increases, and the possibility that the peripheral wall 41 is deformed by heat increases. That is, when the present invention is implemented, platinum diffuses from the layers L1 and L3 to the layer L2 and iridium from the layers L2 to the layers L1 and L3 through the boundary surface as time passes. For this reason, when the difference in thickness between the layer L1 and the layer L3 is large, the difference in the contents of platinum and iridium in the layer L1 and the layer L3 becomes large, thereby causing the thermal expansion coefficients of the layers L1 and L3 to be different. Therefore, as described above, the possibility that the peripheral wall 41 is deformed increases.

  In the glass article manufacturing apparatus 1 according to the embodiment of the present invention configured as described above, the following effects can be enjoyed.

  If the branch channel 4 is formed of a tubular body and the thicknesses of the layers L1 and L3 on both ends of the peripheral wall 41 and the component ratios thereof are the same, the thermal expansion coefficients of the layers L1 and L3 on both ends are the same. Are identical to each other. Therefore, it is possible to suppress the deformation of the peripheral wall 41 due to the difference in thermal expansion between the inner surface side and the outer surface side of the peripheral wall 41. As a result, it is possible to improve the durability of the peripheral wall 41 by avoiding the inconvenience that the peripheral wall 41 is damaged due to deformation by the heat of the molten glass, and to ensure smooth circulation of the molten glass. can do.

  Moreover, since the iridium content rate in the metal member is smaller in the layers L1 and L3 on both ends than the central layer L2, the metal member is worn out by volatilization of iridium from the front and back surfaces of the metal member. Can be suppressed. Also from this, the durability of the peripheral wall 41 can be improved.

  In the above embodiment, the metal member constituting the peripheral wall 41 has a three-layer structure, but does not necessarily have a layer structure. That is, as illustrated in FIG. 3, the iridium or platinum content may be gradually changed from the center toward both ends in the thickness direction of the peripheral wall 41. Even in this case, the platinum content is greater than the iridium content at each of the ends. Further, as illustrated in FIG. 3, the content of iridium and platinum need not be 100% at the maximum, and need not be 0% at the minimum. In FIG. 3, the position where the content of iridium is maximized (the content of platinum is minimized) is the center in the thickness direction. Moreover, in FIG. 3, when both end sides are compared, the iridium and platinum contents are the same, but they may be different.

  The iridium content is preferably 10% or less at both ends, and preferably 30% or more at the center. When the content of iridium exceeds 10% at both ends, there is a high possibility that iridium is oxidized and volatilized during use. If the iridium content is less than 30% at the center, it may not be possible to fully enjoy the chemically and physically advantageous properties of iridium.

  The platinum content is preferably 70% or more at both ends, and preferably 70% or less at the center. If the platinum content is less than 70% at both ends, the chemical and physical advantageous properties of platinum may not be fully enjoyed. If the platinum content exceeds 70% at the center, the content of iridium at the center will decrease, and the chemical and physical advantageous properties of iridium may not be fully enjoyed.

The glass article manufacturing apparatus of the present invention is alkali-free glass (particularly, as a glass composition in mass%, SiO ₂ 50 to 70%, Al ₂ O ₃ 10 to 25%, B ₂ O _{3 3 to} 20%, MgO 0 to 10%, CaO 3 to 15%, BaO 0 to 10%, SrO 0 to 10% non-alkali glass) is suitable as a manufacturing apparatus for a glass plate. This alkali-free glass is suitable as a glass substrate for liquid crystal displays, organic EL displays and the like, and is highly required to be produced at high temperatures, and is required to have high quality. For this reason, the necessity to use the glass article manufacturing apparatus of this invention is high, and the effect by it becomes relatively high. “Non-alkali glass” refers to glass having an alkali metal oxide content of less than 1000 ppm in the glass composition.

  This inventor evaluated the glass article manufacturing apparatus which concerns on the Example of this invention, and the glass article manufacturing apparatus as a comparative example. The configuration of this example is the same as that of the above embodiment, and the peripheral wall 41 of the branch flow path 4 is configured by a metal member made of three layers L1 to L3. The layer L1 inside the peripheral wall 41 is made of molten glass. g (for example, OA-10G manufactured by Nippon Electric Glass Co., Ltd.), the outer layer L3 of the peripheral wall 41 is not covered and is in contact with the atmosphere. Molten glass g which contacts layer L1 is 1400-1750 degreeC. The comparative example is the same as the embodiment except for the structure of the peripheral wall 41.

  In the evaluation, the device after 60 days of use (the periphery of the peripheral wall 41) was examined for the presence or absence of deformation and the presence or absence of wear due to iridium volatilization. Tables 1 and 2 show the conditions of the examples and comparative examples, the survey results, and the overall evaluation. In addition, in the comprehensive evaluation of Tables 1 and 2, the symbol “◯” indicates good, the symbol “Δ” indicates slightly good, and the symbol “x” indicates failure.

  In Examples 1 to 6, the thicknesses and components of the layers L1 and L3 on both ends are the same. In Examples 1 and 2, the components of the layers L1 and L3 on both ends are platinum, and the component of the central layer L2 is iridium. In Examples 3 and 4, the components of the layers L1 and L3 on both ends are platinum and iridium alloys. In Examples 5 and 6, rhodium is included in the components of the layers L1 and L3 on both ends. In Examples 7 and 8, the thicknesses of the layers L1 and L3 on both ends are different from each other.

  In Comparative Example 1, the content of iridium is smaller in the central layer L2 than the layers L1 and L3 on both ends, and the content of platinum is higher in the central layer L2 than the layers L1 and L3 on both ends. The platinum content is smaller than the iridium content in each of the layers L1 and L3 on both ends. In Comparative Examples 2 and 3, the peripheral wall 41 is formed of two layers instead of three layers.

  In Examples 1-6, it can be understood that no wear due to deformation or volatilization is observed, and good results are obtained. Further, in Examples 7 and 8, although a slight deformation is seen, it is not a problem level when viewed in the short term. Compared to these examples, Comparative Example 1 shows wear due to volatilization, Comparative Example 2 shows deformation, and Comparative Example 3 shows both deformation and wear due to volatilization. I understand that.

  In the above embodiment, the peripheral wall 41 is composed only of a metal member composed of the three layers L1 to L3. However, the metal member composed of the three layers L1 to L3 is disposed inside a brick such as a zircon refractory. You may comprise the surrounding wall 41 by providing. In this case, the metal member may be a plate-like body that forms at least an inner surface side portion of the wall portion 41 that contacts the molten glass. It goes without saying that the present invention may be applied to wall portions of the melting furnace 2 and the supply flow path 7 other than the peripheral wall 41.

  Moreover, in the said embodiment, although the branch flow path 4 is comprised by the tubular body and has the surrounding wall 41, it is not limited to this. For example, the branch flow path 4 may have a bottom wall, a side wall, and an arched ceiling wall that covers the entire upper area thereof, or may have an open upper area.

  The present invention is not limited to the above description, and various modifications are possible within the scope of the technical idea. For example, the present invention can be applied to a clarification tank or a stirring tank.

DESCRIPTION OF SYMBOLS 1 Glass article manufacturing apparatus 2 Melting furnace 3 Distribution part 4 Branch flow path 41 Perimeter wall (wall part)
5 Molding part 6 Outflow channel 7 Supply channel g Molten glass L1-L3 layer

Claims (7)

A glass provided with a melting furnace serving as a supply source of molten glass, a supply channel for supplying molten glass flowing out of the melting furnace toward the downstream side, and a molding portion leading to the downstream end of the supply channel In an article manufacturing apparatus,
The wall part forming at least part of the upstream and downstream direction in the melting furnace and the supply flow path or the inner surface side part of the wall part is made of a metal member containing platinum and iridium,
The metal member has a higher platinum content and a lower iridium content at both ends than at the center in the thickness direction, and the iridium content at each end in the thickness direction. If the content of platinum than is rather large,
The said metal member is a glass article manufacturing apparatus characterized by the content rate of platinum becoming large gradually and the content rate of iridium becoming small toward the said both ends from the said center part in the thickness direction . The glass article manufacturing apparatus according to claim 1 , wherein the iridium content is 10% or less at both ends . The content of platinum, glass article manufacturing apparatus according to claim 1 or 2, characterized in that at the both end portions is 70% or more. The glass article manufacturing apparatus according to any one of claims 1 to 3 , wherein the respective surfaces of the both end portions have the same components and ratios thereof. The said metal member is a tubular body which forms the said wall part, The glass article manufacturing apparatus in any one of Claims 1-4 characterized by the above-mentioned. The said metal member is a plate-shaped body which forms the inner surface side site | part which contacts at least molten glass of the said wall part, The glass article manufacturing apparatus in any one of Claims 1-4 characterized by the above-mentioned. Using a glass article manufacturing apparatus according to any one of claims 1 to 6, the glass article producing method characterized by producing a glass article.

Images