Filling structure and method for reducing needle-shaped defects of substrate glass

Abstract

The invention discloses a filling structure and method for reducing needle-shaped defects of substrate glass, and belongs to the technical field of substrate glass defect prevention and control. According to the filling structure provided by the invention, the heat preservation and heating characteristics of the filling material are comprehensively considered, and the environmental conditions of the crystallization reaction are fundamentally optimized. By constructing a multi-layer heat preservation filling structure, the devitrification phenomenon is effectively inhibited, and then generation of needle-shaped defects is greatly reduced. By scientifically and reasonably distributing the filler layer, the thermal expansion difference between the platinum body and the peripheral refractory material is balanced, the risk of structural damage caused by overlarge thermal stress is reduced, and the stability and safety of the production process are further guaranteed. Moreover, due to the introduction of the heating element, the temperature of the platinum tube area is finely regulated and controlled, the local temperature difference can be effectively reduced, and the crystallization phenomenon is further inhibited.

Description

Technical Field

[0001] The present invention relates to the technical field of substrate glass defect prevention and control, and in particular to a filling structure and method for reducing needle-shaped defects in substrate glass. Background Art

[0002] Needle defects are a major defect in the manufacturing process of substrate glass. The core element of the defect is platinum (Pt) or a mixture of platinum and rhodium (Rh). The shape is slender like a needle. The length of the needle defect is usually between 30 microns and 600 microns, and the equivalent diameter of the cross section is between 0.5 microns and 10 microns. The overall size is so small that it must be observed under an optical microscope. There is no fixed pattern for the distribution of these defects inside the glass. Instead, they are randomly scattered in the thickness direction of the plate, often accompanied by liquid level fluctuations or temperature fluctuations in the flange of the clarification section. Studies have shown that the formation of needle defects is closely related to the temperature difference between the inside and outside of the channel, especially the local cold spots in the high-temperature area. Once there is a suitable growth interface, the Pt and Rh elements melted in the glass liquid will precipitate crystals due to reaching a saturated state. These crystals may precipitate in large quantities due to long-term slow shedding or large disturbances during the process.

[0003] When these needle-shaped defects are mixed into the product, especially when they are located in the surface area, they will cause local deformation of the glass surface, which will change the refractive index of light and have an adverse effect on the subsequent high-resolution display effect. In the original structure, due to thermal expansion considerations, expansion space was reserved before and after the flange, so hot filling at high temperature could only be performed after the temperature rise was completed. Compared with cold filling, this area has a natural weakness in thermal insulation and sealing, often forming a large temperature difference between the inside and outside, which becomes the cause of crystallization problems.

[0004] In the production process of substrate glass, needle-shaped defects have always been a difficult problem for the industry to overcome. In-depth exploration of its occurrence mechanism and technical status is crucial to proposing effective solutions. Especially in the high-temperature area of ​​the platinum channel, especially the area of ​​the clarification section flange platinum plate, needle-shaped defects are able to breed due to the special design and physical and chemical processes. When the temperature rises, expansion space must be reserved in the flange area to adapt to the thermal expansion and contraction of the material, but this makes the filling and sealing relatively simple in the cold state, and when filling in the hot state, it is limited by the operating space and working environment, and it is difficult to achieve the same insulation effect as cold filling. Therefore, the platinum channel area of ​​the flange platinum plate becomes a temperature cold spot. The high-temperature volatile gas in the platinum channel will undergo saturated crystallization under appropriate temperature difference conditions. Under the combined effect of temperature gradient and micro-environment, the crystallization mostly presents a needle-shaped structure.

[0005] These needle-shaped defects will gradually accumulate during the production process, and under certain conditions, such as the influence of internal airflow or liquid level fluctuations, they may be drawn into the glass liquid. Once entering the back-end production link, they will form particulate defects in the product, seriously damaging the quality of the substrate glass. At present, the field of substrate glass production still faces many difficulties in dealing with needle-shaped defects. Traditional filling technology has limitations in controlling the temperature of the flange platinum plate area, and the difference in insulation effect between cold and hot filling is difficult to eliminate, resulting in the temperature difference between the inside and outside of the platinum tube is always difficult to effectively control. Although some companies have tried to improve the insulation effect by improving filling materials or optimizing the filling process, the effect is not significant due to actual production conditions.

[0006] In addition, there is currently a lack of targeted and effective means to deal with the saturated crystallization of high-temperature volatile gases in platinum tubes. Most existing technologies adjust the production process from a macroscopic level, but lack in-depth understanding and effective control methods for the microscopic mechanism and specific process of crystallization. Reliable prevention and treatment measures have not yet been found for the problem of needle-shaped defects falling off and being drawn into the liquid surface. This causes needle-shaped defects to persist in the production process, which has a serious impact on the quality and production efficiency of the substrate glass.

[0007] Therefore, how to improve the thermal insulation and sealing effect of the filling technology, thereby controlling the needle defects in the substrate glass production process and improving product quality and production efficiency has become a technical problem that the current technical personnel in this field need to overcome urgently. Summary of the invention

[0008] The object of the present invention is to provide a filling structure and method for reducing needle-shaped defects in substrate glass, so as to overcome the problems in the prior art of poor thermal insulation and sealing effect, unstable temperature control and difficulty in controlling needle-shaped defects.

[0009] The present invention solves the above technical problems through the following technical solutions: A filling structure for reducing glass needle defects of a substrate, characterized in that it comprises a platinum body, a flange and a main-segment refractory structure, wherein the flange is sleeved on the platinum body, the main-segment refractory structure is arranged outside the platinum body, a filling material layer is arranged in a cavity formed by the main-segment refractory structure and the outer wall of the platinum body, and the filling material layer is a ring-type structure or a segmented structure; The split ring structure includes an inner ring and an inner ring, and a partition device is provided at the junction of the inner ring and the inner ring, wherein the filling material layer of the inner ring is the cavity part between the outer wall of the platinum body and the outer wall of the platinum plate of the flange, and the filling material layer of the inner ring is the cavity part between the outer wall of the platinum plate of the flange and the main section refractory structure; The segmented structure includes a first filling material layer, a second filling material layer and a third filling material layer from top to bottom. The first filling material layer is the cavity part between the first horizontal section of the platinum plate of the flange and the upper main section refractory structure. The third filling material layer is the cavity part between the second horizontal section of the platinum plate of the flange and the lower main section refractory structure. The second filling material is the cavity part between the first horizontal section of the platinum plate of the flange and the second horizontal section of the platinum plate of the flange. The first horizontal section of the platinum plate of the flange is set 80~150mm above the top horizontal section of the platinum body; the second horizontal section of the platinum plate of the flange is set 80~150mm below the bottom horizontal section (1-2) of the platinum body.

[0010] Furthermore, it also includes a plurality of heating elements, which are arranged on the platinum disk of the flange and are used to heat the outer wall of the platinum body.

[0011] Furthermore, when the filling material layer is a ring-type structure, the partition device is one of a soft ceramic fiber cloth and a hard brick structure, and the two ends of the soft ceramic fiber cloth are splicing ends; the material of the hard brick structure is zirconium material, the upper part of the hard brick structure is a splicing structure, and the connection between the lower part and the upper part of the hard brick structure is a detachable structure.

[0012] A filling method for reducing needle-shaped defects in substrate glass, based on the above-mentioned filling structure for reducing needle-shaped defects in substrate glass, when the filling material layer is a ring-type structure, comprises the following steps: S1. Select the inner ring and the inner ring filler so that the platinum body channel temperature T b Flange platinum plate temperature T f The following relationship is satisfied: b -T f ≤210℃, and T b ≥1380℃; S2. Use soft ceramic fiber cloth as the partition device between the inner ring and the inner ring, put it into the cavity in advance, and fix the two ends of the soft ceramic fiber cloth with a clamping device; S3, fill the inner ring and the inner ring respectively. When the inner ring is filled, remove the clamping device, splice the two ends of the soft ceramic fiber cloth into one, and continue to fill the inner ring until the filling is completed.

[0013] A filling method for reducing needle-shaped defects in substrate glass, based on the above-mentioned filling structure for reducing needle-shaped defects in substrate glass, when the filling material layer is a ring-type structure, comprises the following steps: S1. Select the inner ring and the inner ring filler so that the platinum body channel temperature T b Flange platinum plate temperature T f The following relationship is satisfied:b -T f ≤210℃, and T b ≥1380℃; S2. Use a hard brick structure as a partition device between the inner and outer rings, wherein the upper part of the hard brick structure is a spliced ​​structure, and the connection between the lower part and the upper part of the hard brick structure is a detachable structure, and the lower part of the hard brick structure is placed in the cavity in advance; S3. First complete the filling of the inner circle and the lower half of the inner circle, then connect the lower half of the hard brick structure with the upper half, and continue to fill the inner circle. When the inner circle is filled, splice the upper half of the hard brick structure into one piece, and continue to fill the inner circle until the filling is completed.

[0014] Furthermore, the filler of the inner ring is zirconium powder, and the filler of the inner ring is a material with a thermal conductivity coefficient less than 1.0 w / (m·℃).

[0015] Furthermore, the material with a thermal conductivity coefficient less than 1.0 w / (m·°C) is hollow alumina sphere powder.

[0016] A filling method for reducing needle-shaped defects in substrate glass, based on the above-mentioned filling structure for reducing needle-shaped defects in substrate glass, when the filling material layer is a segmented structure, comprises the following steps: S1, select the fillers of the first filler layer, the second filler layer and the third filler layer so that the platinum body channel temperature T b Flange platinum plate temperature T f The following relationship is satisfied: b -T f ≤210℃, and T b ≥1380℃; S2, filling the third filling material layer, the second filling material layer and the first filling material layer in sequence.

[0017] Furthermore, the second filling material layer is filled with zirconium powder, and the first filling material layer and the third filling material layer are both filled with materials with an average thermal conductivity of less than 0.6 w / (m·°C).

[0018] Furthermore, the material with an average thermal conductivity of less than 0.6 w / (m·℃) is specifically: glass fiber wool with a thermal conductivity of 0.28 w / (m·℃) and alumina hollow sphere powder with a thermal conductivity of 0.86 w / (m·℃), and the volume ratio of the glass fiber wool to the alumina hollow sphere powder is 2:1, wherein the glass fiber wool is a sheet material with a width of 10 mm, a length of 30 mm, and a thickness of 5 mm.

[0019] Compared with the prior art, the positive and progressive effects of the present invention are: The filling structure provided by the present invention comprehensively considers the heat preservation and heating characteristics of the filling material, and fundamentally optimizes the environmental conditions of the crystallization reaction. By constructing a multi-layer heat preservation filling structure, the crystallization phenomenon is effectively suppressed, thereby greatly reducing the generation of needle-shaped defects. By scientifically and rationally distributing the filling material layer, balancing the thermal expansion difference between the platinum body and the surrounding refractory materials, reducing the risk of structural damage caused by excessive thermal stress, and further ensuring the stability and safety of the production process.

[0020] Furthermore, the introduction of the heating element enables the precise control of the temperature of the platinum tube area, which can effectively reduce the local temperature difference and further suppress the crystallization phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification are used to provide further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] Figure 1 It is a schematic diagram of the structure of needle-shaped defects.

[0023] Figure 2 Schematic diagram of the formation principle of needle-shaped defects.

[0024] Figure 3 It is a radial cross-sectional schematic diagram of the existing filling and sealing technology.

[0025] Figure 4 It is a schematic diagram of the radial cross section of the segmented filling material layer of the present invention.

[0026] Figure 5 It is a schematic diagram of the radial cross section of the ring-type filling material layer of the present invention.

[0027] Figure 6 It is a schematic diagram of the structure of soft ceramic fiber cloth.

[0028] Figure 7 It is a structural diagram of a hard brick structure.

[0029] Figure 8 It is a schematic diagram of the installation position of the heating element.

[0030] Among them, 1 is the platinum body, 1-1 is the top horizontal section, 1-2 is the bottom horizontal section; 2 is the needle-shaped defect; 3 is the filling material layer, 3-1 is the inner ring, 3-2 is the outer ring, 3-3 is the first filling material layer, 3-4 is the second filling material layer, 3-5 is the third filling material layer; 4 is the flange, 4-1 is the platinum disk of the flange, and 4-2 is the outer wall of the platinum disk of the flange; 5 is the heating element; 6 is the main section refractory structure; D is the equivalent diameter of the section; L is the length. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In addition, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, which are intended to explain the present invention rather than to limit it.

[0037] Before describing the specific filling structure and method for reducing the substrate glass needle defects, the characteristics of the substrate glass needle defects are first described, see Figure 1The morphological characteristics of the substrate glass needle defect are a kind of defect with a large ratio of equivalent diameter to length in the cross section. It is a typical morphological characteristic of the crystal. Its length L is usually at the micrometer level, generally satisfying: 30μm<L<600μm. After its cross-sectional shape is magnified to more than 5000 times by an electron microscope, it can be observed that it mostly presents a polygonal or nearly circular structure, and the equivalent diameter D generally satisfies: 0.5μm<D<10μm. The elements were detected by scanning electron microscopy and found that its main component is Pt element, and some defects also include a certain proportion of Rh element, among which the weight percentage of Pt element satisfies: 70%<wt% content<100%, and the weight percentage of Rh element satisfies: 0%<wt% content<22%.

[0038] Based on the basic characteristics of needle-shaped defects, combined with the high-temperature related theories of platinum and rhodium materials, its mechanism can be basically clarified. Specifically, from the theory of high-temperature metal volatilization and saturated vapor pressure, in a high-temperature environment, the saturated vapor pressure of a substance will increase with the increase of temperature. For metal elements in the platinum body, such as Pt and Rh, their vapor pressure will also increase accordingly under the action of high temperature. When the actual vapor pressure in the environment is lower than the saturated vapor pressure of the metal element at a specific temperature, the metal will continue to volatilize. In addition, different metal elements have different saturated vapor pressures at the same temperature due to differences in their physical and chemical properties, which leads to differences in the volatilization temperature and rate of Pt and Rh. The platinum channel oxidizes in a high-temperature environment, causing the base material to continue to volatilize, especially inside the platinum channel corresponding to the root area of ​​the flange. The temperature gradient is larger than that of other main sections. Due to the low temperature, the local area may be saturated and precipitate tiny needle-shaped defects that adhere to the inner wall of the tube body and continue to accumulate. For the basic principle, see Figure 2 . When the internal airflow is disturbed or the liquid level fluctuates, these crystals will fall into the glass liquid below, thus forming defects in the substrate glass product, and the defects are distributed in the thickness and width directions of the glass substrate without aggregation characteristics. In summary, the formation of needle-shaped defects involves multiple factors such as high-temperature oxidation of the platinum channel, material volatilization, temperature gradient, crystal precipitation, internal airflow and liquid level fluctuations. Among these factors, the most critical difference is that the temperature difference between the inside and outside of the defect formation area is often significant. Specifically, the platinum body channel temperature T in the platinum disk area of ​​the flange is b The temperature of the flange platinum plate itself is T f The difference between T b -T f In the range of ≤ 210℃, this is the key control indicator obtained through comparative analysis of a series of high-temperature crystallization tests and multi-wire production processes. It has considerable reference value and can effectively prevent the precipitation of needle-shaped defects.

[0039] See also Figure 3, is the current filling and sealing solution. A hot one-time filling is used for this area. The filling material layer uses zirconium powder, and the entire area is filled with zirconium, including the platinum body and the flange platinum plate and the entire area of ​​the flange connection within the refractory material. Because of its excellent high temperature resistance, the powder has good strength after sintering. It is a material commonly used in the industry. Although it can meet the requirements of making the platinum body channel temperature T b ≥1380℃, but the thermal conductivity of this type of material is about 2.5 w / (m·℃), so its thermal insulation performance is not ideal.

[0040] Therefore, the present invention not only pays attention to its high temperature resistance in the selection of materials, but also focuses on the improvement of thermal insulation performance, and proposes a segmented and circled filling strategy. Specifically: The present invention provides a filling structure for reducing glass needle defects of a substrate, comprising a platinum body 1, a flange 4 and a main-segment refractory structure 6, wherein the flange 4 is sleeved on the platinum body 1, the main-segment refractory structure 6 is arranged outside the platinum body 1, a filling material layer 3 is arranged in a cavity formed by the main-segment refractory structure 6 and the outer wall of the platinum body 1, and the filling material layer 3 is a ring-type structure or a segmented structure; The split ring structure includes an inner ring 3-1 and an outer ring 3-2, and a partition device is provided at the junction of the inner ring 3-1 and the outer ring 3-2, wherein the filling material layer 3 of the inner ring 3-1 is the cavity part between the outer wall of the platinum body 1 and the outer wall 4-2 of the platinum plate of the flange, and the filling material layer 3 of the outer ring 3-2 is the cavity part between the outer wall 4-2 of the platinum plate of the flange and the main section refractory structure 6; The segmented structure includes a first filling material layer 3-3, a second filling material layer 3-4 and a third filling material layer 3-5 from top to bottom. The first filling material layer 3-3 is the cavity part between the first horizontal section of the platinum plate 4-1 of the flange and the upper main section refractory structure 6. The third filling material layer 3-5 is the cavity part between the second horizontal section of the platinum plate 4-1 of the flange and the lower main section refractory structure 6. The second filling material is the cavity part between the first horizontal section of the platinum plate 4-1 of the flange and the second horizontal section of the platinum plate 4-1 of the flange. Among them, the first horizontal section of the platinum plate 4-1 of the flange is set 80~150 mm above the top horizontal section 1-1 of the platinum body 1; the second horizontal section of the platinum plate 4-1 of the flange is set 80~150 mm below the bottom horizontal section 1-2 of the platinum body 1.

[0041] In a specific embodiment of the present invention, see Figure 8, local auxiliary heating is performed on the filling structure that reduces the glass needle defects 2 of the substrate to increase the overall temperature of the area. By adding multiple groups of heating elements 5 on the platinum plate 4-1 of the flange, the outside of the platinum body 1 is directly heated, thereby increasing T b The temperature and the temperature of its external area, the heating element 56 is a heating rod, which is arranged in a plurality of groups in the circumferential direction of the platinum body 1, the end of the heating rod is 10mm~20mm away from the platinum body 1, the material is one of silicon molybdenum rod and platinum rod, and the structure is one of ring, sheet and wire.

[0042] See also Figures 6 and 7 Specifically, when the filling material layer 3 is a ring-type structure, the partition device is one of a soft ceramic fiber cloth and a hard brick structure, and the two ends of the soft ceramic fiber cloth are splicing ends; the material of the hard brick structure is a zirconium material, the upper part of the hard brick structure is a splicing structure, and the connection between the lower part and the upper part of the hard brick structure is a detachable structure.

[0043] Based on the same inventive concept, the present invention also provides a filling method for reducing needle-shaped defects in substrate glass, when the filling material layer 3 is a ring-type structure, comprising the following steps: S1. Select the filling materials of the outer ring 3-2 and the inner ring 3-1 so that the temperature of the platinum body 1 channel T in the platinum plate 4-1 area of ​​the flange b Platinum plate with flange 4-1 temperature T f The following relationship is satisfied: b -T f ≤210℃, and T b ≥1380℃; S2. Use soft ceramic fiber cloth as a partition device between the inner ring 3-1 and the outer ring 3-2, place it in the cavity in advance, and fix the two ends of the soft ceramic fiber cloth with a clamping device; S3, filling the outer ring 3-2 and the inner ring 3-1 respectively. When the inner ring 3-1 is filled, remove the clamping device, splice the two ends of the soft ceramic fiber cloth into one, and continue to fill the outer ring 3-2 until the filling is completed.

[0044] Based on the same inventive concept, the present invention also provides a filling method for reducing needle-shaped defects in substrate glass, which comprises the following steps when the filling material layer 3 is a ring-shaped structure: S1. Select the filling materials of the outer ring 3-2 and the inner ring 3-1 so that the temperature of the platinum body 1 channel T in the platinum plate 4-1 area of ​​the flange b Platinum plate with flange 4-1 temperature T f The following relationship is satisfied: b -T f ≤210℃, and Tb ≥1380℃; S2. Use a hard brick structure as a partition device between the inner ring 3-1 and the outer ring 3-2, wherein the upper part of the hard brick structure is a spliced ​​structure, and the connection between the lower part and the upper part of the hard brick structure is a detachable structure, and the lower part of the hard brick structure is placed in the cavity in advance; S3. First complete the filling of the lower half of the inner circle 3-1 and the outer circle 3-2, then connect the lower half of the hard brick structure with the upper half, and continue to fill the inner circle 3-1. When the inner circle 3-1 is filled, splice the upper half of the hard brick structure into one piece, and continue to fill the outer circle 3-2 until the filling is completed.

[0045] Preferably, the filler of the inner ring 3 - 1 is zirconium powder, and the filler of the outer ring 3 - 2 is a material with a thermal conductivity of less than 1.0 w / (m·° C.).

[0046] Preferably, the material with a thermal conductivity coefficient less than 1.0 w / (m·° C.) is hollow alumina sphere powder.

[0047] In a specific embodiment of the present invention, the inner diameter of the platinum plate 4-1 of the flange is 300 mm, and the outer diameter is 500 mm, see Figure 5 , the inner ring 3-1 with a thickness of 100mm from the platinum body 1 is filled with zirconium powder, that is, the first horizontal section of the platinum plate 4-1 of the flange is set 100mm above the top horizontal section 1-1 of the platinum body 1; the second horizontal section of the platinum plate 4-1 of the flange is set 100mm below the bottom horizontal section 1-2 of the platinum body 1; the outer ring 3-2 is filled with other materials. According to the distance and thickness, the average thermal conductivity of other materials needs to be below 1.0 w / (m·℃) to meet the channel temperature T of the platinum body 1 in the area of ​​the platinum plate 4-1 of the flange. b Platinum plate with flange 4-1 temperature T f Control requirements less than or equal to 210℃, and T b The target temperature requirement of 1380℃ or above is reached. Because the area is not a completely open structure in four directions in the actual structure, and the filling process itself is also a high-temperature operation, the effective operation time and space are limited. Therefore, direct operation cannot achieve the internal ring structure or approximate ring structure shown in the figure, so a simple and easy-to-install temporary partition structure is required.

[0048] Option 1: See Figure 6, high temperature resistant soft ceramic fiber cloth is used, which is also a commonly used material in the substrate glass industry. Small pieces are often cut for fixing local areas such as thermocouples. In this scheme, the material is placed in the filling cavity in advance, and temporary clamping devices are fixed at both ends to hold up the soft ceramic fiber cloth to form a natural nearly semicircular structure. When filling, the inner circle 3-1 is filled with zirconium powder, and the outer circle 3-2 is filled with alumina hollow ball powder. Finally, the entire soft ceramic fiber cloth is buried in the filling space to form a circular structure similar to the core area.

[0049] Option 2: See Figure 7 It adopts a hard brick structure and is processed into two parts, the lower part is a semicircular structure, and the upper part is a detachable arc plate structure. The material of the hard brick structure is the zirconium material commonly used in the area. During actual filling, it is filled in two times, upper and lower.

[0050] The materials of the above two partition devices have been used and verified in practice. The platinum body 1 channel temperature T in the platinum plate 4-1 area of ​​the flange b All reached 1401℃, and the region T b With T f The actual difference is 199°C, which is in line with the design expectations. The number and size of this type of defects in the product are also reduced by nearly 70%, with significant results.

[0051] In a specific embodiment of the present invention, the difference from the above embodiment is that the first horizontal section of the platinum plate 4-1 of the flange is set 80 mm above the top horizontal section 1-1 of the platinum body 1; the second horizontal section of the platinum plate 4-1 of the flange is set 80 mm below the bottom horizontal section 1-2 of the platinum body 1.

[0052] In a specific embodiment of the present invention, the difference from the above embodiment is that the first horizontal section of the platinum plate 4-1 of the flange is set 150 mm above the top horizontal section 1-1 of the platinum body 1; the second horizontal section of the platinum plate 4-1 of the flange is set 150 mm below the bottom horizontal section 1-2 of the platinum body 1.

[0053] Based on the same inventive concept, the present invention also provides a filling method for reducing glass needle defects on a substrate, when the filling material layer 3 is a segmented structure, comprising the following steps: S1, select the fillers of the first filler layer 3-3, the second filler layer 3-4 and the third filler layer 3-5 so that the temperature of the platinum body 1 channel T in the platinum plate 4-1 area of ​​the flange b Platinum plate with flange 4-1 temperature T f The following relationship is satisfied: b -T f ≤210℃, and T b≥1380℃; S2, filling the third filling material layer 3-5, the second filling material layer 3-4 and the first filling material layer 3-3 in sequence.

[0054] Preferably, the second filling material layer 3-4 is filled with zirconium powder, and the first filling material layer 3-3 and the third filling material layer 3-5 are both filled with materials with an average thermal conductivity of less than 0.6 w / (m·°C).

[0055] Preferably, the material with an average thermal conductivity of less than 0.6w / (m·℃) is specifically: glass fiber wool with a thermal conductivity of 0.28w / (m·℃) and alumina hollow sphere powder with a thermal conductivity of 0.86w / (m·℃), and the volume ratio of glass fiber wool to alumina hollow sphere powder is 2:1, wherein the glass fiber wool is a sheet material with a width of 10mm, a length of 30mm and a thickness of 5mm.

[0056] As a specific embodiment of the present invention, when the filling material layer 3 is a segmented structure, the second filling material layer 3-4 is filled with zirconium powder. According to the distance and thickness estimation, the average thermal conductivity of the first filling material layer 3-3 and the third filling material layer 3-5 needs to be below 0.6 w / (m·℃) to meet T b -T f ≤210℃, and T b In order to meet the target requirement of ≥1380℃, this embodiment takes operability into consideration and sacrifices some thermal insulation efficiency. Therefore, for the first filling material layer 3-3 and the third filling material layer 3-5, a new type of filling mixed with two materials is considered, namely glass fiber wool with a thermal conductivity of about 0.28 w / (m·℃) and alumina hollow ball powder with a thermal conductivity of about 0.86 w / (m·℃). The specific operation is: the finished glass fiber wool is cut into a sheet material with a width of 10mm, a length of 30mm, and a thickness of about 5mm using a cutting tool, and is evenly mixed with alumina hollow balls in a volume ratio of 2:1. The resulting mixture has excellent thermal insulation performance and better high temperature resistance than the thermal insulation wool alone. It has been verified in actual use that T b Reach 1392℃, and T b With degree T f The actual difference is 206℃, which is in line with the design expectations. The number and size of this type of defects in the product are also reduced by about 58%, with a good effect.

[0057] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A filling structure for reducing needle-shaped defects in substrate glass, characterized in that: It comprises a platinum body (1), a flange (4) and a main section refractory structure (6), wherein the flange (4) is sleeved on the platinum body (1), the main section refractory structure (6) is arranged outside the platinum body (1), a filling material layer (3) is arranged in a cavity formed by the main section refractory structure (6) and the outer wall of the platinum body (1), and the filling material layer (3) is a ring-type structure or a segmented structure; The split ring structure comprises an inner ring (3-1) and an inner ring (3-2), wherein a partition device is provided at the junction of the inner ring (3-1) and the inner ring (3-2), wherein the filling material layer (3) of the inner ring (3-1) is the cavity portion between the outer wall of the platinum body (1) and the outer wall of the platinum plate (4-2) of the flange, and the filling material layer (3) of the inner ring (3-2) is the cavity portion between the outer wall of the platinum plate (4-2) of the flange and the main section refractory structure (6); The segmented structure comprises, from top to bottom, a first filling material layer (3-3), a second filling material layer (3-4) and a third filling material layer (3-5), wherein the first filling material layer (3-3) is the cavity portion between the first horizontal section of the platinum plate (4-1) of the flange and the upper main section refractory structure (6), the third filling material layer (3-5) is the cavity portion between the second horizontal section of the platinum plate (4-1) of the flange and the lower main section refractory structure (6), and the second filling material is the cavity portion between the first horizontal section of the platinum plate (4-1) of the flange and the second horizontal section of the platinum plate (4-1) of the flange. The first horizontal section of the platinum plate (4-1) of the flange is arranged 80 to 150 mm above the top horizontal section (1-1) of the platinum body (1); and the second horizontal section of the platinum plate (4-1) of the flange is arranged 80 to 150 mm below the bottom horizontal section (1-2) of the platinum body (1).

2. A filling structure for reducing needle-shaped defects in substrate glass according to claim 1, characterized in that: It also includes a plurality of heating elements (5), wherein the heating elements (5) are arranged on the platinum disk (4-1) of the flange and are used to heat the outer wall of the platinum body (1).

3. The filling structure for reducing needle-shaped defects in substrate glass according to claim 1, characterized in that: When the filling material layer (3) is a ring-type structure, the partition device is one of a soft ceramic fiber cloth and a hard brick structure, and the two ends of the soft ceramic fiber cloth are spliced ​​ends; the material of the hard brick structure is a zirconium material, the upper part of the hard brick structure is a spliced ​​structure, and the connection between the lower part and the upper part of the hard brick structure is a detachable structure.

4. A filling method for reducing needle-shaped defects in substrate glass, characterized in that: Based on the filling structure for reducing glass needle defects (2) of a substrate according to claim 1, when the filling material layer (3) is a ring-type structure, the filling structure comprises the following steps: S1. Select the filling material of the inner ring (3-2) and the inner ring (3-1) so that the temperature of the platinum body (1) channel in the platinum plate (4-1) area of ​​the flange is T b Temperature T of platinum plate with flange (4) f The following relationship is satisfied: b -T f ≤210℃, and T b ≥1380℃; S2, using soft ceramic fiber cloth as a partition device between the inner ring (3-1) and the inner ring (3-2), placing it in the cavity in advance, and fixing the two ends of the soft ceramic fiber cloth with a clamping device; S3, filling the inner ring (3-2) and the inner ring (3-1) respectively. When the inner ring (3-1) is filled, remove the clamping device, splice the two ends of the soft ceramic fiber cloth into one piece, and continue to fill the inner ring (3-2) until the filling is completed.

5. A filling method for reducing needle-shaped defects in substrate glass, characterized in that: Based on the filling structure for reducing glass needle defects (2) of a substrate according to claim 1, when the filling material layer (3) is a ring-type structure, the filling structure comprises the following steps: S1. Select the filling material of the inner ring (3-2) and the inner ring (3-1) so that the temperature of the platinum body (1) channel in the platinum plate (4-1) area of ​​the flange is T b Temperature T of platinum plate with flange (4) f The following relationship is satisfied: b -T f ≤210℃, and T b ≥1380℃; S2. A hard brick structure is used as a partition device between the inner circle (3-1) and the inner circle (3-2), wherein the upper part of the hard brick structure is a spliced ​​structure, and the connection between the lower part of the hard brick structure and the upper part is a detachable structure, and the lower part of the hard brick structure is placed in the cavity in advance; S3. First complete the filling of the inner circle (3-1) and the lower half of the inner circle (3-2), then connect the lower half of the hard brick structure with the upper half, and continue to fill the inner circle (3-1). When the inner circle (3-1) is filled, splice the upper half of the hard brick structure into one piece, and continue to fill the inner circle (3-2) until the filling is completed.

6. A filling method for reducing needle-shaped defects in substrate glass according to any one of claims 4 to 5, characterized in that: The filler of the inner ring (3-1) is zirconium powder, and the filler of the inner ring (3-2) is a material with a thermal conductivity of less than 1.0 w / (m·℃).

7. The filling method for reducing needle-shaped defects in substrate glass according to claim 6, characterized in that: The material with a thermal conductivity coefficient less than 1.0 w / (m·°C) is hollow alumina sphere powder.

8. A filling method for reducing needle-shaped defects in substrate glass, characterized in that: Based on the filling structure for reducing glass needle defects (2) of a substrate according to claim 1, when the filling material layer (3) is a segmented structure, the filling structure comprises the following steps: S1. Select the fillers of the first filler layer (3-3), the second filler layer (3-4) and the third filler layer (3-5) so that the channel temperature T of the platinum body (1) in the platinum plate (4-1) area of ​​the flange b Temperature T of platinum plate with flange (4) f The following relationship is satisfied: b -T f ≤210℃, and T b ≥1380℃; S2, filling the third filling material layer (3-5), the second filling material layer (3-4) and the first filling material layer (3-3) in sequence.

9. The filling method for reducing needle-shaped defects in substrate glass according to claim 8, characterized in that: The second filling material layer (3-4) is filled with zirconium powder, and the first filling material layer (3-3) and the third filling material layer (3-5) are both filled with materials with an average thermal conductivity of less than 0.6 w / (m·℃).

10. The filling method for reducing needle-shaped defects in substrate glass according to claim 9, characterized in that: The materials with an average thermal conductivity of less than 0.6 w / (m·℃) are specifically: glass fiber wool with a thermal conductivity of 0.28 w / (m·℃) and alumina hollow sphere powder with a thermal conductivity of 0.86 w / (m·℃), and the volume ratio of the glass fiber wool to the alumina hollow sphere powder is 2:1, wherein the glass fiber wool is a sheet material with a width of 10 mm, a length of 30 mm, and a thickness of 5 mm.

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