JP2014162701A - Double glazing, and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide vacuum double glazing having a seal structure in which each of glass substrates is restrained from being deformed by a thermal expansion difference therebetween and which can be produced easily.SOLUTION: The double glazing is obtained by sealing a clearance part 130 to be formed between a first glass substrate 110 and a second glass substrate 120, which are arranged to be opposed to each other, by using a sealing member 150. The sealing member 150 includes: first and second joint layers 160, 165, the former (the latter) of which is formed circularly on the peripheral end face of the first glass substrate 110 (the second glass substrate 120); and a circular metal member 155 which is assembled on the peripheries of both of the first glass substrate 110 and the second glass substrate 120 while interposing the first (second) joint layer 160 (165) therebetween and which has the thermal expansion rate higher than that of each of the first glass substrate 110 and the second glass substrate 120. The circular metal member 155, the peripheral length of whose inside surface is shorter than that of the joint layer-formed first (second) glass substrate 110 (120) at room temperature before assembled, is made longer by heating, assembled on the peripheries of both of the first glass substrate 110 and the second glass substrate 120 and then cooled to form the clearance part.

Description

  The present invention relates to a multilayer glass and a method for producing a multilayer glass.

  A so-called “vacuum double-glazed glass”, which is formed by laminating a pair of glass substrates through a gap and holding the gap under atmospheric pressure or in a vacuum state, has an excellent heat insulating effect. It is widely used for window glass for buildings such as houses.

  The structure of a conventional vacuum multi-layer glass sealing member (sealing structure) is to fix the periphery of a pair of glass substrates with glass frit. However, in such a sealing structure, when a large temperature difference occurs between the room and the room, the vacuum double-glazed glass may be distorted or deformed due to the difference in thermal expansion of each glass substrate. In particular, when this phenomenon becomes significant, the vacuum double-glazed glass may be damaged.

  In order to solve such a problem, a vacuum double-glazed glass having a seal structure composed of a metal member and glass frit that allow the seal member to be deformed to some extent is disclosed (for example, see Patent Document 1). As shown in FIG. 10, Patent Document 1 discloses a first glass substrate 2, a second glass substrate 3, a gap portion 6 formed by a spacer 5 between both glass substrates, and the gap. A vacuum double-glazed glass 51 including a sealing member 70 formed around the portion 6 is shown. The seal member 70 is considered to have a certain degree of deformation function by sealing with a U-shaped metal member 71 between the first glass frit 25 and the second glass frit 26.

European Patent No. 2099997

  However, it is extremely difficult to prepare such a U-shaped metal member 71. Since the sealing structure of the vacuum double-glazed glass is required to have high sealing performance, when using a metal member having a three-dimensional shape such as U-shaped in Patent Document 1, the metal member is made of an annular seamless member (joint). Or a plurality of members joined in a circular shape by welding or the like.

  However, it is almost impossible to produce a complex three-dimensional metal as a seamless member by a general metal processing method. In addition, the U-shaped metal member 71 needs to be configured with a very thin thickness so as to be within the height of the gap (for example, 150 μm), but such a thin three-dimensional metal member is welded. It is very difficult to join by such as. Furthermore, since the U-shaped metal member 71 is used as a sealing member, the joint portion is required to have high sealing performance without defects or gaps. In order to form such a joint having a high sealing performance in a complicated shape member, a highly accurate joining technique is required.

  The present invention has been made in view of the above-described problems, and suppresses deformation of the multilayer glass due to a difference in thermal expansion of each glass substrate and has a sealing structure that is easy to manufacture, and a method for manufacturing the same. The purpose is to provide.

In order to achieve the above object, the present invention provides:
The gap formed between the first glass substrate and the second glass substrate facing each other is a multilayer glass sealed with a sealing member,
The sealing member is
A first bonding layer formed on an end surface around the first glass substrate;
A second bonding layer formed on an end surface around the second glass substrate;
It is assembled around the first glass substrate and the second glass substrate through the first and second bonding layers, and has a higher heat than the first glass substrate and the second glass substrate. An annular metal member having an expansion coefficient,
The first glass substrate or the second joint in which the first joining layer is formed with the circumference of the inner surface of the metal member in a state of room temperature before being assembled to the first and second glass substrates. The first glass substrate or the second bonding layer on which the first bonding layer is formed by heating the metal member that is shorter than the circumference of the second glass substrate on which the layer is formed. The first glass substrate on which the first bonding layer is formed and the second bonding layer are formed in a state that is longer than the peripheral length of the second glass substrate on which is formed Provided is a multi-layer glass formed by being cooled after being assembled around a second glass substrate.

  The present invention provides a double-glazed glass having a seal structure that suppresses deformation of the double-glazed glass due to a difference in thermal expansion of each glass substrate and is easy to manufacture, and a method for manufacturing the same.

It is the cross-sectional schematic diagram which showed the vacuum multilayer glass (1st vacuum multilayer glass) by 1st Embodiment of this invention. It is the cross-sectional schematic diagram which expanded and showed the sealing member in order to demonstrate suppressing the deformation | transformation by the thermal expansion difference in 1st multilayer glass. It is the cross-sectional schematic diagram which showed the vacuum double layer glass (2nd vacuum double layer glass) by 2nd Embodiment of this invention. It is the cross-sectional schematic diagram which showed the vacuum multilayer glass (3rd vacuum multilayer glass) by 3rd Embodiment of this invention. It is the figure which showed schematically one Embodiment of the manufacture flow of the multilayer glass of this invention. It is the cross-sectional schematic diagram which showed the relationship between the glass substrate and metal member in manufacturing step S20 of the multilayer glass of this invention. It is the cross-sectional schematic diagram which showed the relationship between the glass substrate and metal member in manufacturing step S30 of the multilayer glass of this invention. It is the cross-sectional schematic diagram which showed the relationship between the glass substrate and metal member in manufacturing step S40 of the multilayer glass of this invention. It is the cross-sectional schematic diagram which showed the state of the glass substrate and metal member in manufacturing step S50 of the multilayer glass of this invention. It is the cross-sectional schematic diagram which showed the conventional vacuum multilayer glass typically.

  Embodiments of the present invention will be described below with reference to the drawings.

(First vacuum double-glazed glass)
Hereinafter, with reference to FIG. 1, the vacuum multilayer glass by 1st Embodiment of this invention is demonstrated. In the following description, “vacuum double-glazed glass” will be described as an example of double-glazed glass, and the configuration and characteristics thereof will be described. However, the present invention is not limited to “vacuum multilayer glass”, and can be similarly provided to any multilayer glass such as “multilayer glass in which a gas is sealed in a gap”.

  In FIG. 1, it shows in the cross-sectional schematic diagram of 1 structure of 1st vacuum multilayer glass. In the following description, coordinates are defined by an arrow in the lower left of the figure, and description will be made using these coordinates if necessary. Moreover, the cross-sectional schematic diagram shows the time when the vacuum multilayer glass is viewed from the cross-sectional direction (Y direction).

  As shown in FIG. 1, the first vacuum multi-layer glass 100 according to the first embodiment of the present invention includes a first glass substrate 110, a second glass substrate 120, a first glass substrate 110, and a second glass substrate 110. The gap portion 130 formed between the glass substrates 120, a plurality of spacers 190 for holding the gap portion 130, and a seal member 150 for holding the gap portion 130 in a sealed state. The seal member 150 includes a first bonding layer 160, a metal member 155, and a second bonding layer 165.

  In the following description, when the first glass substrate 110 and the second glass substrate 120 are described at the same time, they are referred to as both glass substrates 110 and 120. Similarly, when the first bonding layer 160 and the second bonding layer 165 are described at the same time, they are referred to as both bonding layers 160 and 165.

  The composition of the glass constituting both glass substrates 110 and 120 is not particularly limited. For example, soda lime glass or non-alkali glass may be used, and the glass compositions of both glass substrates 110 and 120 may be the same. It may be different.

  Moreover, the inside of the gap 130 formed by the two glass substrates 110 and 120 is maintained in a vacuum state. The degree of vacuum of the gap 130 is not particularly limited, and may be any pressure lower than atmospheric pressure. Generally, the pressure in the gap 130 is about 0.2 Pa to 0.001 Pa. That is, in the present application, the “vacuum multilayer glass” is not limited to the one in which the pressure in the gap is in a vacuum state, and the term “vacuum multilayer glass” means that the pressure in the gap is less than atmospheric pressure. It shall mean all double-glazed glass. Note that the gap 130 may be filled with an inert gas such as argon at a pressure lower than atmospheric pressure.

  Further, the thickness (length in the Z direction) of the gap portion 130 is preferably in the range of 0.01 mm to 5 mm, and 0.05 mm to 0 mm when the gap portion 130 is at a pressure lower than atmospheric pressure. More preferably, it is in the range of 3 mm. Further, when the gap 130 is filled with an inert gas or the like at a certain pressure, it is preferably in the range of 5 mm to 50 mm, and more preferably in the range of 10 mm to 30 mm.

  If necessary, the vacuum multilayer glass 100 may have one or more spacers 190 in the gap 130. The spacer 190 has a role of holding the gap 130 in a desired shape. However, when the gap 130 can be maintained in a desired shape without the spacer 190, for example, when the degree of vacuum of the gap 130 is low, or when an inert gas or the like is applied to the gap 130 at a certain pressure. In the case of filling, the spacer 190 may be omitted. The spacer 190 may have the same material, shape and dimensions as the spacer used in conventional vacuum double glazing.

  The seal member 150 is a member for sealing the gap 130 in a sealed state, and the seal member 150 is configured over the entire periphery of the gap 130. Here, the term “sealing” refers to an ideal state in which the degree of vacuum in the gap is not reduced at all via the seal member. However, changes in the degree of vacuum over time are allowed.

  Both bonding layers 160 and 165 that are components of the seal member 150 are formed on the end surfaces 116 and 126 around the glass substrates 110 and 120, respectively. That is, both the bonding layers 160 and 165 are continuously formed over the entire circumference of both glass substrates 110 and 120, and have an annular shape in plan view.

  Further, both the bonding layers 160 and 165 do not need to be in contact with the entire end surfaces 116 and 126 of both glass substrates, respectively, and may have any length in the Z direction.

  Further, both the bonding layers 160 and 165 may be formed not only from the end surfaces 116 and 126 of both glass substrates but also from the end surfaces of the glass substrates to the surface. That is, when viewed in cross section, it may be formed in a U shape or an L shape along the end face and the surface, respectively.

  The thicknesses of both the bonding layers 160 and 165 (in the case of a plurality of layers to be described later, the total thickness) are not limited to this, but for example, both the glass substrates 110 and 120 and the metal member 155. From the viewpoint of bonding, it may be in the range of 0.1 μm to 1000 μm.

  In the example of FIG. 1, the cross-sections of both the bonding layers 160 and 165 are both shown in a substantially rectangular shape with rounded corners. However, this is merely a representation on the drawing, and the cross sections of both the bonding layers 160 and 165 may have other shapes such as a substantially elliptical shape and a substantially trapezoidal shape. Further, the cross-sectional shapes of the bonding layers 160 and 165 may be different.

  Both bonding layers 160 and 165 may be made of any material such as ceramics, glass (particularly low-melting glass), metal, and the like as long as they have bonding properties to both glass substrates 110 and 120 and metal member 155. Moreover, both the joining layers 160 and 165 do not necessarily need to be composed of a single layer, and may be composed of a plurality of layers. Further, both the bonding layers 160 and 165 may be made of the same material or different materials.

For example, both the bonding layers 160 and 165 may be vitrified layers. The vitrified layer is formed by firing a paste containing glass frit. The glass frit eventually becomes a glass component constituting the first vitrified layer. The vitrified layer may further contain ceramic particles in addition to the glass frit. The composition of the glass component contained in the vitrified layer is not particularly limited. The glass component contained in the vitrified layer may be, for example, ZnO—Bi ₂ O ₃ —B ₂ O ₃ based glass or ZnO—SnO—P ₂ O ₅ based glass.

Table 1 shows an example of the composition of ZnO—Bi ₂ O ₃ —B ₂ O ₃ based glass that can be used for the glass component contained in the vitrified layer. Table 2 shows an example of the composition of ZnO—SnO—P ₂ O ₅ based glass that can be used for the glass component contained in the vitrified layer.

  Alternatively, either one of the bonding layers 160 and 165 may include a metal sprayed film on the surface. For example, when the first bonding layer 160 has a sprayed film, the metal member 155 can be bonded to the first bonding layer 160 by, for example, brazing or soldering in the assembly process. Such a metal sprayed film may be formed in an annular shape at the end of the glass substrate by, for example, an arc spraying method or a plasma spraying method. The material of the metal sprayed film is not limited to this, but for example, copper (and copper alloy), aluminum (and aluminum alloy), tin (and tin alloy), silver (and silver alloy), platinum (and platinum) Alloy), gold (and gold alloy), zinc (and zinc alloy), and the like.

  The metal member 155 has a plate shape parallel to the thickness direction (Z direction) of the vacuum multilayer glass when the vacuum multilayer glass is viewed from the cross-sectional direction (Y direction). Is formed in an annular shape in a plan view so as to surround. The metal member 155 has an inner surface 170 facing the end surface 116 of the first glass substrate and an end surface 126 of the second glass substrate, and an outer surface 172 on the opposite side.

  The thickness of the metal member 155 in the X direction in FIG. 1 is a thickness in the range of 10 μm to 2000 μm when the gap 130 is under atmospheric pressure from the viewpoint of strength. May be filled at a certain pressure, it may have a thickness in the range of 1 μm to 2000 μm.

  In the example of FIG. 1, the length of the metal member 155 in the Z direction is shown to be equal to the thickness of the vacuum double-glazed glass 100, but the length of the metal member 155 is not limited to this. That is, as long as the gap is formed by connecting the first bonding layer 160 and the second bonding layer 165, the metal member 155 has any length as long as it functions to suppress the deformation of the vacuum double-glazed glass 100. You may do it. The metal member may not cover the entire surface in the Z direction of the bonding layer.

  Further, a plurality of metal members may be stacked in the X direction and / or the Z direction in FIG. 1 to form a layer shape. At this time, all the metal members constituting the layer may be made of the same material, or may be made of different materials. When a different material is used, it is preferable that a material having a large thermal expansion coefficient is disposed on the outer layer side.

  The type of the metal material constituting the metal member 155 is not particularly limited as long as the coefficient of thermal expansion is larger than that of glass. Examples of the metal member 155 include aluminum and aluminum alloys, nickel and nickel alloys, various stainless steels, Ni-based / Fe-based / Co-based superalloys (heat-resistant alloys), copper and copper alloys, silver and silver alloys, gold and gold alloys, You may select from platinum, a platinum alloy, etc. In particular, aluminum and aluminum alloys, copper and copper alloys, and various stainless steels are desirable.

  A part of the inner surface 170 of the metal member 155 is coupled to the first bonding layer 160 and the second bonding layer 165 when viewed in the cross-sectional direction, and seals the gap 130. By disposing such a sealing member 150 around the gap 130, the gap 130 is sealed.

  The shape of the metal member 155 in the preparatory stage is not particularly limited as long as the final provided shape is annular. Therefore, for example, an annular metal member 155 may be formed by bending an elongated plate-like member and joining both ends. Alternatively, the annular metal member 155 may be configured by joining a plurality of elongated plate-like members. Alternatively, the annular metal member 155 may be provided as a seamless member by cutting the plate-like member into an annular shape or punching the plate-like member into an annular shape. For example, a seamless metal member may be realized by preparing a plate-shaped metal member and performing a press cutting process or a spinning process so as to cut the inside of the plate-shaped metal member.

  As described above, the metal member used for the sealing member 150 of the vacuum double-glazed glass 100 is not a complicated three-dimensional shape such as a U-shape, but is generally represented by welding, punching, spinning, or the like. It is a simple structure that can be manufactured by a typical metal processing method. For this reason, the metal member 155 can be manufactured easily.

  Furthermore, since the metal member 155 is formed in a plate shape or a substantially plate shape whose cross section is parallel to the Z direction and is formed in an annular shape in plan view, the processing of the corner portion is also easy. When the metal member has a U-shaped cross section, it is extremely difficult to accurately configure the corner portion. However, the annular metal member 155 can be configured with a seamless member without a joint portion, or a plurality of plate-like members can be combined. Since it can be easily configured, there is no difficulty in dealing with corner portions.

  By disposing the annular metal member 155 over the periphery of the gap portion, when a temperature difference occurs between the first glass substrate 110 and the second glass substrate 120, the force transmitted from the both glass substrates to the metal member 155. Due to the elastic deformation of the metal member 155, it is possible to suppress deformation such as warpage of the vacuum double-glazed glass 100 due to the difference in thermal expansion between the glass substrates 110 and 120. At this time, plastic deformation may be accompanied with elastic deformation of the metal member 155.

  Hereinafter, this effect will be described in more detail with reference to FIG. In FIG. 2, the expanded cross-section schematic diagram of the part of the sealing member 150 is shown.

  First, in the vacuum double-glazed glass 100, a case is assumed where the first glass substrate 110 side is cooled to low temperature by the outside air and lower than the second glass substrate 120 side. In this case, a stress in the contracting direction is generated on the first glass substrate 110, and a stress in the expanding direction is generated on the second glass substrate 120.

  More specifically, as shown in FIG. 2A, the first glass substrate 110 tends to be deformed in the direction of the arrow F101, and accordingly, the first glass is interposed via the first bonding layer 160. The upper part of the metal member 155, which is a region connected to the substrate, also receives a force in the direction of the arrow F101. On the other hand, the second glass substrate 120 tends to be deformed in the direction of the arrow F102, and accordingly, the lower portion of the metal member 155 which is a region bonded to the second glass substrate through the second bonding layer 165. Also receives a force in the direction of arrow F102.

  That is, the metal member 155 includes a portion bonded to the first bonding layer 160 (hereinafter referred to as “first bonding portion (175)”) and a portion bonded to the second bonding layer 165 (hereinafter referred to as “ The second coupling portion (referred to as “177”) receives opposite forces in opposite directions. For this reason, the portion of the metal member 155 having a thickness Za of the gap portion that is not coupled to another member extends and deforms.

  By such extension and deformation of the metal member 155, the sealing member 150 relieves the stress that acts when there is a temperature difference between the first glass substrate 110 and the second glass substrate 120, and both the glass substrates 110, 120. It is possible to suppress deformation such as warpage due to the difference in thermal expansion.

  Next, in the vacuum multilayer glass 100, the temperature of the first glass substrate 110 becomes high, and the temperature of the second glass substrate 120 becomes low, so that the first glass substrate 110 side becomes the second glass substrate 120. Assume that the temperature is higher than that of the side. In this case, a stress in the expanding direction is generated on the first glass substrate 110, and a stress in the contracting direction is generated on the second glass substrate 120.

  As shown in FIG. 2B, the first glass substrate 110 tends to be deformed in the direction of the arrow F201, and accordingly, the first bonding layer 160 is coupled with the first glass substrate. The upper part of a certain metal member 155 also receives a force in the direction of arrow F201. On the other hand, the second glass substrate 120 tends to be deformed in the direction of the arrow F202, and accordingly, the lower part of the metal member 155, which is a region bonded to the second glass substrate in the second bonding layer 165, A force is received in the direction of arrow F202.

  That is, the metal member 155 receives forces that are opposite to each other in the opposite directions at the first coupling portion 175 and the second coupling portion 177. Therefore, a portion of the metal member 155 having a thickness Za of the gap formed by the glass substrate that is not bonded to another member extends and deforms.

  By such extension and deformation of the metal member 155, the sealing member 150 relieves the stress that acts when there is a temperature difference between the first glass substrate 110 and the second glass substrate 120, and both the glass substrates 110, 120. It is possible to suppress deformation such as warpage due to the difference in thermal expansion.

  Thus, in the vacuum double-glazed glass 100, distortion and deformation of the vacuum double-glazed glass 100 can be significantly suppressed by the deformation function of the metal member 155 included in the seal member 150.

  As described above, in the vacuum multilayer glass 100 according to the first embodiment of the present invention, it is possible to provide a vacuum multilayer glass having a seal structure that is easy to manufacture and suppresses deformation due to a difference in thermal expansion of each glass substrate. Can do.

  By the way, in the vacuum double-glazed glass, a high sealing performance is required for a seal member installed around the gap in order to keep the gap in a vacuum state. However, when the metal member 155 whose cross-sectional shape has a plate shape parallel to the Z direction as shown in FIG. 1 is used as the seal member, the metal member 155 expands and contracts due to a temperature change. There is a possibility that shearing stress is generated on the bonding surface between the first bonding layer 160 and the second bonding layer 165, and peeling may occur in some cases, so that the sealing performance cannot be maintained.

  Therefore, in the present invention, the metal member 155 having a shorter inner surface peripheral length than the first glass substrate 110 or the second glass substrate 120 is used in the state of room temperature before assembly. The circumferential length of the inner surface of the metal member 155 is equal to the circumference of the first glass substrate 110 on which the first bonding layer is formed or the second glass substrate 120 on which the second bonding layer is formed. In comparison, the glass is heated to a long state, assembled in the heated state, and cooled to obtain a double-layer glass shown in FIG.

  By adopting such an assembling method, the first glass on which the first bonding layer is formed because the metal member tries to return to the size before assembling when cooled to the room temperature after being assembled. A force of compressing from the end face toward the inner direction is generated over the entire circumference of the substrate 110 and the second glass substrate 120 on which the second bonding layer is formed. Since both the bonding layers 160 and 165 are strong against the shear stress by the compressing force, higher bonding strength and sealing effect can be obtained as compared with the conventional sealing method. Furthermore, since it becomes strong also against a shear force, more desirable sealing performance can be obtained as a vacuum double-glazed glass, and the performance can be maintained over a long period of time. In particular, when low melting point glass or glass frit is used for both bonding layers, these materials are weaker than metal materials, etc., and weak against forces such as tension. A configuration in which both glass substrates 110 and 120 are tightened over the entire circumference is effective. Details of this manufacturing method will be described later.

  In addition, the inner peripheral length of the metal member 155 is 0.1 to 0.8 at room temperature (for example, 20 ° C.) as compared with the peripheral length of the glass substrate 110 or 120 on which the bonding layer is formed in a state before assembly. % Shorter, more preferably 0.25 to 0.4% shorter.

  Further, the inner peripheral length of the metal member 155 is compared with the peripheral lengths of the first glass substrate 110 and the second glass substrate 120 on which the bonding layer is formed at a temperature higher than the softening point of the bonding layer, for example, by heating. The length of the bonding layer is not longer than the length of contact with the entire surface of the bonding layer at the softening point (for example, about 350 ° C. to about 600 ° C., preferably 470 ° C. to 560 ° C. (for example, 490 ° C.)) preferable.

(Second multilayer glass)
Next, with reference to FIG. 3, the vacuum multilayer glass by 2nd Embodiment of this invention is demonstrated. In FIG. 3, an example of a structure of the vacuum double-glazing (2nd vacuum double-glazing) by 2nd Embodiment of this invention is shown roughly.

  As shown in FIG. 3, the second vacuum multilayer glass 200 basically has the same configuration as the first vacuum multilayer glass 100 shown in FIG. Therefore, in FIG. 3, the same reference numerals as those in FIG. 1 are used for the same members as in FIG. However, the second vacuum double-glazed glass 200 shown in FIG. 3 is different from the first vacuum double-glazed glass 100 shown in FIG. 1 in the structure of the metal member. A reference code obtained by adding 100 to the reference code is used.

  In the second vacuum double-glazed glass 200 shown in FIG. 3, the sealing member 250 includes a metal member 255 having a “convex portion” when viewed in cross section. Specifically, when the metal member 255 is viewed in cross section, the inner surface 270 and the outer surface 272 are in the out-of-plane direction of the glass substrate, with a thickness Za corresponding to the gap formed between both glass substrates of the metal member 255. A convex portion 280 that is curved is formed.

  The sealing member 250 having the metal member 255 having such a shape can further suppress the deformation due to the difference in thermal expansion between the first glass substrate 110 and the second glass substrate 120 than the first vacuum double-layer glass 100. . That is, the convex portion 280 makes it possible to increase the length in the cross-sectional direction of the metal member 255 that becomes the “deformation allowance” when the metal member 255 is deformed (contracted or expanded), and corresponds to a larger deformation. It becomes possible.

  In addition, in FIG. 3, although the convex part 280 is provided in the out-of-plane direction of both the glass substrates 110 and 120, the direction of the convex part 280 may be the in-plane direction of both the glass substrates 110 and 120.

  In the example of FIG. 3, the convex portion 280 of the metal member 255 is indicated by a curved outline, but the shape of the metal member 255 is not limited to this. That is, both the surfaces 270 and 272 of the metal member 255 may have a linear contour or a contour composed of a combination of a straight line and a curved line.

  In FIG. 3, the convex portion 280 is provided at one location in the Za region corresponding to the thickness of the gap portion 130 formed of the glass substrate of the metal member 255, but a plurality of convex portions 280 may be provided. At this time, the directions of the plurality of convex portions 280 formed in the Z direction may all be the same or may be wavy structures that are randomly combined. In particular, a bellows structure in which the directions of the convex portions 280 are alternately and continuously formed in the in-plane direction and the out-of-plane direction of the glass substrates 110 and 120 (the X direction in FIG. 8 and the opposite direction thereof) may be employed.

Further, in the first bonding portion 175, if there is no space between the first bonding layer 160 and the inner surface 270 of the metal member 255 so that the gap 130 communicates with the outside air, the end surface 116 of the first glass substrate 110 is used. A part of the convex portion 280 may be formed in the region of the thickness Zb ₁ . Similarly, in the second bonding portion 177, if there is no space between the second bonding layer 165 and the inner surface 270 of the metal member 255 so that the gap 130 communicates with the outside air, the end surface of the second glass substrate 120 is used. A part of the convex portion 280 may be formed in the region of the thickness Zb ₂ of 126.

(Third multilayer glass)
Next, with reference to FIG. 4, the vacuum multilayer glass by 3rd Embodiment of this invention is demonstrated. In FIG. 4, an example of a structure of the vacuum double glazing (3rd double glazing) by 3rd Embodiment of this invention is shown roughly.

  As shown in FIG. 4, the third multilayer glass 300 basically has the same configuration as the first multilayer glass 100 shown in FIG. 1 described above. Therefore, in FIG. 4, the same reference numerals as those in FIG. 4 are used for the same members as in FIG. 1, and the reference numerals obtained by adding 200 to the reference numerals in FIG. doing.

  The third multilayer glass 300 shown in FIG. 4 is a first glass substrate and a second glass substrate that are the same as the first multilayer glass 100 shown in FIG. Are different in length. That is, in the first multilayer glass 100 shown in FIG. 1, the end surfaces of the first glass substrate 110 and the second glass substrate 120 are aligned when viewed from the cross-sectional direction (Z direction). On the other hand, in the third multilayer glass 300 shown in FIG. 4, when viewed from the Z direction, the first glass substrate 310 has an end surface on the inner side as compared with the second glass substrate 320.

  Furthermore, since the first glass substrate and the second glass substrate have different sizes, the shape of the metal member 355 is also different from that in FIG. That is, in the third multilayer glass 300 shown in FIG. 4, the seal member 350 includes a metal member 355 having a “step shape” when viewed from the Z direction of the multilayer glass.

  That is, as shown in the schematic cross-sectional view of FIG. 4, the length of the periphery of the first glass substrate 310 is shorter than the length of the periphery of the second glass substrate 320, and the metal member 355 is formed of the first glass substrate. 310 and the second glass substrate 320 have a stepped shape along a step formed around the periphery.

  In the example of FIG. 4, both surfaces 370 and 372 of the metal member 355 are shown with contours bent at right angles, but the shape of the metal member 355 is not limited to this. That is, the metal member 355 may be bent at an angle other than a right angle, and may have a curved shape or a contour formed by a combination of a straight line and a curved line.

  Further, the outer surface 372 of the metal member 355 does not need to follow the shape of the inner surface 370, and if only the inner surface 370 has a stepped shape, the outer surface 372 may not have a stepped shape.

  In addition, also in the 3rd multilayer glass 300 shown in FIG. 4, the effect similar to the 2nd vacuum multilayer glass 200 is acquired. Although the case where the first glass substrate 310 is smaller than the second glass substrate 320 is shown in the third embodiment, the second glass substrate 320 may be smaller than the first glass substrate 310.

(Manufacturing method of multi-layer glass according to an embodiment of the present invention)
Next, with reference to FIG. 5, an example of the manufacturing method of the multilayer glass by one Embodiment of this invention is demonstrated. In FIG. 5, the flowchart of an example of the manufacturing method of the multilayer glass by one Embodiment of this invention is shown.

  As shown in FIG. 5, in the method for producing a multilayer glass according to an embodiment of the present invention, a first bonding layer is formed on an end surface around the first glass substrate, and an end surface around the second glass substrate. Step S10 for forming the second bonding layer, Step S20 for preparing an annular metal member having an inner surface and an outer surface, Step S30 for heating the produced metal member, the first glass substrate and the second A heated annular metal member is assembled around the laminated body on which the glass substrates are laminated to form an assembly, and the assembly is heated, and step S50 is heated.

  Further, in FIGS. 6 to 9, square glass at each temperature of step S20 (at room temperature), step S30 (at the time of heating the metal member), step S40 (at the time of assembly) and step S50 (at the time of heating the assembly). When the board | substrate and a metal member are seen from a Z direction, the cross-sectional schematic diagram seen from the direction of the arrow (Y direction) with the dashed-dotted line is shown.

  Hereinafter, each step will be described in detail with reference to FIG. 5, and the size relationship between the glass substrate and the metal member in each step will be described with reference to FIGS. 6 to 9. In the following description, as an example, the method for producing a multilayer glass according to the present invention will be described using the vacuum multilayer glass 100 having the configuration shown in FIG. 1 as an example.

(Step S10)
First, the first and second glass substrates 110 and 120 are prepared. In addition, the first bonding layer 160 is formed on the first glass substrate 110, and the second bonding layer 165 is formed on the second glass substrate 120. Hereinafter, the case where the 1st glass solidification layer is formed in the end surface 116 of the 1st glass substrate 110 is demonstrated to the case where the joining layer 160 is a glass solidification layer as an example.

  When the first glass solidified layer is formed on the end surface of the first glass substrate 110, first, a paste for the first glass solidified layer is prepared. Generally, the paste includes glass frit, ceramic particles, a polymer, an organic binder, and the like.

  The prepared paste is applied to the end surface 116 of the first glass substrate 110. Thereafter, the first glass substrate 110 containing the paste is dried. The conditions for the drying treatment are not particularly limited as long as the organic binder in the paste is removed. The drying process may be performed, for example, by holding the first glass substrate 110 at a temperature of 100 ° C. to 200 ° C. for about 30 minutes to 1 hour.

  Thereafter, the first glass substrate 110 is heat-treated at a high temperature in order to pre-fire the paste. The conditions for the heat treatment are not particularly limited as long as the polymer contained in the paste is removed. The heat treatment may be performed, for example, by holding the first glass substrate 110 in a temperature range of 300 ° C. to 470 ° C. for about 30 minutes to 1 hour. Thereby, a paste is baked and a 1st glass solidified layer is formed.

  A second vitrified layer is formed on the end surface of the second glass substrate 120 in the same manner.

(Step S20)
Next, the annular metal member 155 is prepared as a seamless member by, for example, a press cutting method or a spinning process so as to cut out the inside of the plate-like metal member. In the example of FIG. 6, the metal member 155 has a similar shape to the first glass substrate or the second glass substrate, and is square in plan view.

The size of the metal member prepared in S20 needs to satisfy the relationship as shown in FIG. That is, the circumferential length of the inner surface 170 of the metal member 155 is the length of the periphery of the first glass substrate 110 on which the first bonding layer is formed or the second glass substrate 120 on which the second bonding layer is formed. Compared with (for example, the shorter one of the first glass substrate and the second glass substrate), the structure is shorter at room temperature (for example, 20 ° C.). Preferably, it is 0.1 to 0.8% shorter, more preferably 0.25 to 0.4% shorter. As shown in FIG. 6, when viewed in a schematic cross-sectional view, the distance Xa ₁ between the inner surfaces 170 of the two opposing sides of the metal member 155 at room temperature is the length Xb ₁ between the two opposing sides of the glass substrate at room temperature. And Xa ₁ <Xb ₁ .

(Step S30)
Next, the annular metal member 155 is heated. The temperature at this time varies depending on the coefficient of thermal expansion of the metal member 155 to be used, but it is necessary to set the size of the metal member 155 and the glass substrates 110 and 120 so as to satisfy the relationship shown in FIG. That is, by heating, the peripheral length of the inner surface 170 of the metal member 155 is larger than the peripheral lengths of the two glass substrates 110 and 120 on which the vitrified layers are formed by thermal expansion as shown in FIG. become longer. When the cross-sectional schematic diagram is seen as shown in FIG. 7, the distance Xa ₂ between the _two inner surfaces 170 facing each other of the metal member 155 at the time of heating is determined by the vitrified layer at the temperature at the time of assembly in step S40 described later. The length Xb ₂ between two opposite sides of the formed glass substrates 110 and 120 is in a relationship of Xa ₂ ≧ Xb ₂ .

(Step S40)
Next, a heated annular metal member 155 is assembled around the laminated body in which the first glass substrate 110 and the second glass substrate 120 are laminated in a state where the gap 130 is formed, thereby forming an assembly. To do.

  Note that the first glass substrate 110 and the second glass substrate 120 may be stacked with a predetermined gap between them to be stacked before step S40, and a heated annular metal member. It is only necessary to prepare a laminated body before assembling. Further, the state in which the two glass substrates 110 and 120 are laminated in this way is defined as a “laminated body”. At this time, a spacer 190 may be disposed between the first glass substrate 110 and the second glass substrate 120 as necessary. Further, when the spacer 190 is not used, the first glass substrate 110 and the second glass substrate 120 may be held using mechanical means or the like, and a state in which a predetermined interval is maintained may be realized.

Thereafter, the metal member heated in step S30 is assembled around the laminated body to constitute an assembly. Here, before the heated metal member 155 is arranged around the laminated body, the relationship shown in FIG. 7 is established. After the metal member 155 is arranged around the laminated body, the metal member 155 and the two glass substrates 110, It is desirable that the size of 120 has the relationship shown in FIG. That is, the circumference of the inner surface 170 of the metal member 155 is the same as the circumference of both glass substrates 110 and 120 on which the glass solidified layers are arranged before the metal member 155 is arranged around the laminate. Or after long arrangement | positioning, it is equal to the circumference | surroundings length of both the glass substrates 110 and 120 with which the glass solidification layer is arrange | positioned. When the schematic cross-sectional view is viewed, the length Xa ₃ between the inner contours of the two opposite sides of the metal member 155 when assembled and the two opposite sides of both glass substrates 110 and 120 on which the glass solidified layer is formed during assembly The length Xb ₃ between them has a relationship of Xa ₃ = Xb ₃ .

  Here, in the present application, the state where the heated metal member 155 and the first bonding layer 160 and the second bonding layer 165 are in contact with each other is defined as an “assembly” to form an assembly. A series of processes in step S40 for this purpose is defined as “assembly”.

Further, in the process from step S30 to step S40, when the relationship of Xa ₂ > Xb ₂ to Xa ₃ = Xb ₃ is established, the metal member 155 is placed in the periphery of the laminated body, and the temperature environment is lower than that in step S30. When the assembly is performed and the magnitude relationship does not change from Xa ₂ = Xb ₂ to Xa ₃ = Xb ₃ , the temperature environment when the metal member 155 is arranged around the laminate is substantially the same as that in step S30.

  Thus, the temperature at the time of assembling may be any temperature as long as it satisfies the magnitude relationship between the series of metal members 155 and the glass substrates 110 and 120 on which the glass solidified layer is formed in step S30 and step S40. Further, the temperature at the time of assembly may be a temperature equal to or higher than the softening point of the vitrified layer. In addition, in the softening point of the vitrified layer, the circumferential length of the inner surface 170 of the metal member 155 when the metal member 155 is not assembled to the laminate is the both glass substrates 110 and 120 on which the vitrified layer is disposed. It is desirable to be equal to or shorter than the perimeter of.

(Step S50)
Next, the assembly is heated. The heating temperature and the heating time vary depending on the softening point of the vitrified layer. For example, the assembly is placed in a chamber at a temperature of about 350 ° C. to about 600 ° C., preferably 470 ° C. to 560 ° C. (eg 490 ° C.) for about 5 seconds to 180 minutes, preferably about 15 seconds to 30 minutes (eg 20 Min)), after holding, it may be removed from the chamber and cooled to room temperature.

  In addition, it is preferable that the process from step S30 to step S50 is performed continuously without lowering the temperature. For example, the metal member 155 is heated near the softening point of the glass solidified layer or higher temperature in the chamber, and the laminate is heated near the softening point of the glass solidified layer in another region in the chamber. May be manufactured by a method of assembling a laminate to form an assembly and holding it, followed by cooling to room temperature.

  The heating may be performed by partially heating at least the first and second vitrified layers, not the entire assembly.

  After the heat treatment, the assembly is cooled, and the inner surface 170 of the metal member 155 is bonded to the first glass solidified layer and the second glass solidified layer at the first and second joint portions 175 and 177. Then, a gap 130 surrounded by the seal member 150 is formed between the first glass substrate 110 and the second glass substrate 120.

  Thus, the multilayer glass which can suppress the deformation | transformation by the thermal expansion difference of each glass substrate with the metal member 155 which has a deformation | transformation function can be manufactured by an easy method.

  In addition, it is possible to produce a multilayer glass excellent in the sealing performance of the gap. Specifically, since the metal member 155 attempts to return to the size at the room temperature in the process of cooling to room temperature, the both glass substrates 110 as shown in the cross-sectional schematic diagram of FIG. , 120 and both joining layers 160, 165 exert a compressive force in the directions of arrows F301 and F302. With this compressive force, even when a glass solidified layer containing a low melting point glass or glass frit that is generally weak against shear stress is used as a bonding layer, it can be strong against shear stress. Compared with this sealing method, higher bonding strength with the metal member can be obtained. Further, since the compressing force is also transmitted to the glass substrate, when viewed from the Z direction in FIG. 9, both the glass substrates 110 and 120 receive a force from the metal member 155 in the in-plane direction from the peripheral portion to generate a compressive stress. It becomes a state.

  Since both the glass substrates 110 and 120 with the bonding layer formed in this way are clamped over the entire circumference by the metal member 155, higher bonding strength and desirable sealing performance as a vacuum double-layer glass can be obtained. In addition, a new effect that is unprecedented that the performance can be maintained for a long time is exhibited.

  For this reason, it can be expected to be installed in a place where the vibration of the moving body or the like is transmitted to the glass or a place where the temperature difference between the first glass substrate 110 and the second glass substrate 120 is severe. In addition, since the metal member 155 can easily cope with various shapes, it is possible to produce a window having an asymmetric part or a window having a special shape.

The strength of the tightening depends on the magnitude relationship between the glass substrate and the metal member in the schematic cross-sectional view of FIG. That is, if the difference between the length Xa ₁ inside the two opposite sides of the metal member 155 at room temperature and the length Xb ₁ between the two opposite sides of the glass substrates 110 and 120 at room temperature is large, the tightening strength is increased. Becomes bigger.

  Thereafter, the inside of the gap 130 is subjected to a decompression process using the first glass substrate 110 and the second glass substrate 120, or openings provided in advance in both. For example, the gas in the gap 130 is replaced with an inert gas, or the gap 130 is decompressed. Furthermore, the opening used for the decompression process is sealed. Thereby, the 1st vacuum multilayer glass 100 is manufactured.

  The formation of the assembly, heating, and cooling processing may be performed in a reduced pressure environment. That is, the assembly is assembled in a state where the assembly is disposed in a chamber under a pressure lower than atmospheric pressure, and heating and cooling processes are performed. When the assembly is formed and heat-treated in a reduced pressure environment, the gap 130 is held in vacuum during assembly, heating, and cooling, so that the pressure-reducing treatment is completed simultaneously with the processing of the seal member. . Furthermore, it is not necessary to make holes in the glass substrate, and a decompression process step after heating is not necessary.

  As a method of heating the assembly, a method of locally heating the first and second vitrified layers (infrared heating, electromagnetic heating, laser irradiation, etc.) may be employed in addition to the whole heating method.

  Through the above steps, the vacuum double-glazed glass 100 having the configuration as shown in FIG. 1 can be manufactured. In the above description, the method for producing a multilayer glass according to an embodiment of the present invention has been described using the vacuum multilayer glass 100 having the configuration shown in FIG. 1 as an example. However, the above manufacturing method can be used as it is or with only slight modifications, for example, vacuum multilayer glass having other configurations (for example, vacuum multilayer glass 200, 300 described later), and “non-vacuum” multilayer glass. The same applies to the above.

  For example, in the case of the vacuum multi-layer glass 300 according to the third embodiment, the inner surface 170 of the metal member 155 has a bonding portion with the first glass substrate 110 and a bonding portion with the second glass substrate 120, respectively. The first glass substrate 110 or the second glass substrate 120 to be bonded may satisfy the magnitude relationship of steps 120 to 140.

  Further, as described above, the first bonding layer 160 or the second bonding layer 165 may be formed of a metal sprayed film instead of the glass solidified layer. In this case, the metal member 155 is bonded to the joining layer formed of the metal sprayed film by, for example, brazing or soldering in the assembly stage of the assembly. Therefore, the stability of the assembly is improved, problems such as misalignment are suppressed, and the handling properties of the subsequent assembly can be improved.

  INDUSTRIAL APPLICATION This invention can be utilized for the double glazing used for the window glass etc. of a building, especially a vacuum double glazing.

100, 200, 300 Vacuum double-glazed glass 110, 210, 310 First glass substrate 116, 216, 316 End surface of first glass substrate 120, 220, 320 Second glass substrate 126, 226, 326 Second glass End face of substrate 130, 230, 330 Gap 150, 250, 350 Seal member 155, 255, 355 Metal member 160, 260, 360 First bonding layer 165, 265, 365 Second bonding layer 170, 270, 370 Inside Surface 172, 272, 372 Outer surface 175, 275, 375 First coupling portion 177, 277, 377 Second coupling portion

Claims (13)

The gap formed between the first glass substrate and the second glass substrate facing each other is a multilayer glass sealed with a sealing member,
The sealing member is
A first bonding layer formed on an end surface around the first glass substrate;
A second bonding layer formed on an end surface around the second glass substrate;
It is assembled around the first glass substrate and the second glass substrate through the first and second bonding layers, and has a higher heat than the first glass substrate and the second glass substrate. An annular metal member having an expansion coefficient,
The first glass substrate or the second joint in which the first joining layer is formed with the circumference of the inner surface of the metal member in a state of room temperature before being assembled to the first and second glass substrates. The first glass substrate or the second bonding layer on which the first bonding layer is formed by heating the metal member that is shorter than the circumference of the second glass substrate on which the layer is formed. The first glass substrate on which the first bonding layer is formed and the second bonding layer are formed in a state that is longer than the peripheral length of the second glass substrate on which is formed A multi-layer glass formed by being cooled after being assembled around the second glass substrate.   The multi-layer glass according to claim 1, wherein the multi-layer glass has the gap portion less than atmospheric pressure.   The multilayer glass according to claim 1, wherein the metal member is a seamless member.   The said metal member is a multilayer glass as described in any one of Claim 1 to 3 which has a plate shape parallel to the plate | board thickness direction of this multilayer glass, when it sees from the cross-sectional direction of a multilayer glass.   The multilayer glass according to any one of claims 1 to 4, wherein the first bonding layer or the second bonding layer has a glass solidified layer.   The said metal member is a multilayer glass as described in any one of Claim 1 to 5 which has a convex part when it sees from the cross-sectional direction of a multilayer glass.   When the metal member is viewed from the cross-sectional direction of the multi-layer glass, the convex portions are formed by alternately and continuously in the in-plane direction and the out-of-plane direction of the first glass substrate and the second glass substrate. Multi-layer glass according to any one of claims 1 to 6, comprising a structure.   The length of the circumference of the first glass substrate is shorter than the length of the circumference of the second glass substrate, and when the metal member is viewed from the cross-sectional direction of the multilayer glass, The multilayer glass according to any one of claims 1 to 7, which has a stepped shape along a step formed around the second glass substrate. A gap formed between a first glass substrate and a second glass substrate facing each other is a method for producing a multilayer glass in which a sealing member is sealed,
Forming a first bonding layer on an end surface around the first glass substrate, and forming a second bonding layer on an end surface around the second glass substrate;
The first glass substrate having an inner surface and an outer surface, having a thermal expansion coefficient larger than that of the first glass substrate and the second glass substrate, and a circumference of the inner surface being at room temperature Or preparing an annular metal member that is shorter than the circumference of the second glass substrate;
The peripheral length of the inner surface of the metal member is compared with the peripheral length of the first glass substrate on which the first bonding layer is formed or the second glass substrate on which the second bonding layer is formed. Heating the metal member until it is long,
A laminate in which the first glass substrate on which the first bonding layer is formed and the second glass substrate on which the second bonding layer is formed are stacked in a state where the gap is formed. And constructing an assembly by assembling the metal member heated so as to be in contact with the first bonding layer and the second bonding layer around the laminated body;
Heating the assembly to bond the first and second bonding layers and the metal member;
A method for producing a double-glazed glass, comprising:   The first bonding layer or the second bonding layer has a glass solidified layer, and the glass solidified layer is cooled and solidified after being softened while being in contact with the metal member by heating the assembly. The manufacturing method of the multilayer glass of Claim 9 by which the 1st joining layer and the said 2nd joining layer, and the said metal member are joined.   The method for producing a multilayer glass according to claim 9 and 10, wherein the metal member is a seamless member.   The metal member has a plate shape parallel to the end surface of the first glass substrate and the end surface of the second glass substrate when viewed from the cross-sectional direction of the multilayer glass. The manufacturing method of the double glazing described in 2.   The step of heating the assembly to bond the first bonding layer and the second bonding layer to the metal member is performed in an air atmosphere at 350 ° C. to 600 ° C. for 5 seconds to 30 seconds. The method for producing a multilayer glass according to any one of claims 9 to 12, wherein the glass is cooled to room temperature after being held for a minute.

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