Filling structure and method for reducing acicular defects in substrate glass

Abstract

The present invention belongs to the technical field of the prevention and control of defects in substrate glass, and discloses a filling structure and method for reducing acicular defects in substrate glass. For the filling structure provided by the present invention, the thermal insulation and heating characteristics of a filling material are comprehensively considered, and therefore environmental conditions for a crystallization reaction are fundamentally optimized. By constructing a multi-layer thermal-insulation filling structure, the phenomenon of crystallization is effectively suppressed, thereby greatly reducing the generation of acicular defects. By means of the scientific and rational distribution of a filling material layer, a thermal expansion difference between a platinum body and a surrounding refractory material is balanced, the risk of structural damage caused by excessive thermal stress is reduced, and the stability and safety of the production process are further ensured. Moreover, by means of the introduction of a heating element, fine control over the temperature in a platinum tube region is achieved; therefore, a local temperature difference can be effectively reduced, and the phenomenon of crystallization can be further suppressed.

Description

A filling structure and method for reducing needle-like defects in substrate glass. Technical Field

[0001] This invention relates to the field of substrate glass defect prevention and control technology, specifically to a filling structure and method for reducing needle-like defects in substrate glass. Background Technology

[0002] Needle-like defects, a major flaw in substrate glass manufacturing, are primarily composed of platinum (Pt) or a mixture of platinum and rhodium (Rh). These defects are elongated and needle-like, typically ranging in length from 30 to 600 micrometers, with an equivalent cross-sectional diameter between 0.5 and 10 micrometers. Their minute size necessitates observation using an optical microscope. The distribution of these defects within the glass is not fixed but rather random along the thickness direction, often arising from liquid level fluctuations or temperature fluctuations in the refining section flange. Research indicates that the formation of needle-like defects is closely related to the temperature difference between the inside and outside of the channel, particularly localized cold spots in high-temperature regions. Once a suitable growth interface is present, the Pt and Rh elements molten in the glass will precipitate and crystallize due to saturation. These crystals may precipitate in large quantities due to slow, long-term shedding or significant disturbances during the process.

[0003] When these needle-like defects are incorporated into a product, especially when located in the surface area, they can cause localized deformation of the glass surface, thereby altering the refractive index of light and adversely affecting the subsequent high-resolution display effect. In the original structure, due to considerations of thermal expansion, expansion space is reserved before and after the flange, so hot filling can only be performed after the heating process is complete. Compared to cold filling, this area has a natural weakness in terms of thermal insulation and sealing, often resulting in a large internal and external temperature difference, which becomes a contributing factor to crystallization problems.

[0004] Needle-like defects have always been a difficult problem to overcome in the production process of substrate glass. A thorough understanding of their occurrence mechanism and current technological status is crucial for proposing effective solutions. Especially in the high-temperature zone of the platinum channel, particularly in the refining section flange platinum disc area, needle-like defects can arise due to special design and physicochemical processes. The flange area requires expansion space during heating to accommodate the thermal expansion and contraction of the material. However, this makes filling and sealing relatively simple in the cold state, while in the hot state, the limited operating space and environment make it difficult to achieve the same insulation effect as in the cold state. Therefore, the platinum channel area of ​​the flange platinum disc becomes a temperature cold spot. High-temperature volatile gases within the platinum channel will undergo saturation crystallization under suitable temperature difference conditions. Under the combined influence of temperature gradient and microenvironment, the crystallization often presents as a needle-like structure.

[0005] These needle-like defects accumulate gradually during production and, under specific conditions such as internal airflow or liquid surface fluctuations, may be drawn into the molten glass. Once they enter the later stages of production, they become particulate defects in the product, severely damaging the quality of the substrate glass. Currently, the substrate glass manufacturing industry still faces many challenges in handling needle-like defects. Traditional filling techniques have limitations in controlling the temperature in the flange platinum disc area; the difference in insulation effect between cold and hot filling is difficult to eliminate, making it difficult to effectively control the temperature difference inside and outside the platinum tube. Although some companies have attempted to improve the insulation effect by improving filling materials or optimizing filling processes, the results have not been significant due to limitations in actual production conditions.

[0006] Furthermore, there is currently a lack of effective and targeted methods to address the saturation crystallization problem of high-temperature volatile gases inside platinum tubes. Existing technologies mostly adjust the production process at a macroscopic level, lacking a deep understanding and effective control methods for the microscopic mechanisms and specific processes of crystallization. Reliable prevention and treatment measures have also not been found for the detachment and entrapment of needle-like defects into the liquid surface. This results in the persistent presence of needle-like defects during production, severely impacting the quality of the substrate glass and production efficiency.

[0007] Therefore, how to improve the thermal insulation and sealing effect of filling technology, thereby controlling needle-like defects in the substrate glass production process and improving product quality and production efficiency, has become a technical problem that urgently needs to be solved by those skilled in the art. Technical issues

[0008] Reliable prevention and treatment measures have not yet been found for the detachment and entrainment of needle-like defects into the liquid surface. This results in the continued presence of needle-like defects during the production process, severely impacting the quality of the substrate glass and production efficiency. Technical solutions

[0009] The purpose of this invention is to provide a filling structure and method for reducing needle-like defects in substrate glass, so as to overcome the problems of poor heat preservation and sealing effect and unstable temperature control in the prior art, which makes it difficult to control needle-like defects.

[0010] The present invention solves the above-mentioned technical problems through the following technical solution:

[0011] A filling structure for reducing needle-like defects in substrate glass includes a platinum body, a flange, and a main refractory structure. The flange is sleeved on the platinum body, and the main refractory structure is disposed on the outside of the platinum body. A filling layer is disposed in the cavity formed by the main refractory structure and the outer wall of the platinum body. The filling layer is a ring-shaped structure or a segmented structure.

[0012] The ring-shaped structure includes an inner ring and an outer ring. A partition device is provided at the junction of the inner ring and the outer ring. The filling layer of the inner ring is the cavity between the outer wall of the platinum body and the outer wall of the platinum disc of the flange. The filling layer of the outer ring is the cavity between the outer wall of the platinum disc of the flange and the refractory structure of the main section.

[0013] The segmented structure includes, from top to bottom, a first filler layer, a second filler layer, and a third filler layer. The first filler layer is the cavity between the first horizontal cross-section of the flange's platinum disc and the upper main refractory structure. The third filler layer is the cavity between the second horizontal cross-section of the flange's platinum disc and the lower main refractory structure. The second filler material is the cavity between the first and second horizontal cross-sections of the flange's platinum disc.

[0014] The first horizontal section of the platinum disc of the flange is located 80-150 mm above the top horizontal section of the platinum body; the second horizontal section of the platinum disc of the flange is located 80-150 mm below the bottom horizontal section (1-2) of the platinum body.

[0015] Furthermore, it also includes several heating elements, which are mounted on the platinum disc of the flange and used to heat the outer wall of the platinum body.

[0016] Furthermore, when the filling layer has a ring-shaped structure, the partition device is either a soft ceramic fiber cloth or a hard brick structure. The two ends of the soft ceramic fiber cloth are splicing ends; the hard brick structure is made of 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.

[0017] A filling method for reducing needle-like defects in substrate glass, based on the aforementioned filling structure for reducing needle-like defects in substrate glass, includes the following steps when the filler layer has a ring-shaped structure:

[0018] S1. Select the filler material for the outer and inner rings to achieve a platinum body channel temperature T in the platinum disc area of ​​the flange. b Temperature T of the platinum disc of the flange f Satisfy the following relationship: T b -T f ≤210℃, and T b ≥1380℃;

[0019] S2. Soft ceramic fiber cloth is used as a partition between the inner and outer rings. It is placed inside the cavity in advance and the two ends of the soft ceramic fiber cloth are fixed by a clamping device.

[0020] S3. Fill the outer and inner rings separately. When the inner ring is filled, remove the clamping device, splice the two ends of the soft ceramic fiber cloth together, and continue filling the outer ring until the filling is complete.

[0021] A filling method for reducing needle-like defects in substrate glass, based on the aforementioned filling structure for reducing needle-like defects in substrate glass, includes the following steps when the filler layer has a ring-shaped structure:

[0022] S1. Select the filler material for the outer and inner rings to achieve a platinum body channel temperature T in the platinum disc area of ​​the flange. b Temperature T of the platinum disc of the flange f Satisfy the following relationship: T b -T f ≤210℃, and T b ≥1380℃;

[0023] S2. A rigid brick structure is used as the partition between the inner and outer rings. The upper part of the rigid brick structure is a spliced ​​structure, and the lower part of the rigid brick structure is a detachable structure at the connection with the upper part. The lower part of the rigid brick structure is placed into the cavity in advance.

[0024] S3. First, complete the filling of the lower half of the inner and outer rings. Then, connect the lower half of the hard brick structure to the upper half and continue filling the inner ring. When the inner ring is filled, splice the upper half of the hard brick structure into one piece and continue filling the outer ring until the filling is complete.

[0025] Furthermore, zirconium powder is selected as the filler for the inner ring, while a material with a thermal conductivity of less than 1.0 W / (m·℃) is selected as the filler for the outer ring.

[0026] Furthermore, the material with a thermal conductivity of less than 1.0 W / (m·℃) is alumina hollow sphere powder.

[0027] A filling method for reducing needle-like defects in substrate glass, based on the aforementioned filling structure for reducing needle-like defects in substrate glass, includes the following steps when the filler layer has a segmented structure:

[0028] S1. Select the filler materials for the first, second, and third filler layers to achieve a platinum body channel temperature T in the platinum disc area of ​​the flange. b Temperature T of the platinum disc of the flange f Satisfy the following relationship: T b -T f ≤210℃, and T b ≥1380℃;

[0029] S2. Fill the third filler layer, the second filler layer and the first filler layer in sequence.

[0030] Furthermore, the second filler layer uses zirconium powder, while the first and third filler layers both use materials with an average thermal conductivity of less than 0.6 W / (m·℃).

[0031] Furthermore, the materials with an average thermal conductivity of less than 0.6 W / (m·℃) are specifically: glass fiber cotton with a thermal conductivity of 0.28 W / (m·℃) and alumina hollow sphere powder with a thermal conductivity of 0.86 W / (m·℃), with a volume ratio of glass fiber cotton to alumina hollow sphere powder of 2:1. The glass fiber cotton is a sheet material with a width of 10 mm, a length of 30 mm, and a thickness of 5 mm. Beneficial effects

[0032] The filling structure provided by this invention comprehensively considers the thermal insulation and heating properties of the filling material, fundamentally optimizing the environmental conditions for the crystallization reaction. By constructing a multi-layer thermal insulation filling structure, crystallization is effectively suppressed, thereby significantly reducing the generation of needle-like defects. Through the scientific and rational distribution of the filling layers, the difference in thermal expansion between the platinum body and the surrounding refractory material is balanced, reducing the risk of structural damage caused by excessive thermal stress, and further ensuring the stability and safety of the production process.

[0033] Furthermore, the introduction of heating elements enables precise temperature control in the platinum tube region, effectively reducing local temperature differences and further suppressing crystallization. Attached Figure Description

[0034] The accompanying drawings are provided to further understand the invention and constitute a part of this invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0035] Figure 1 is a schematic diagram of the structure of needle-like defects.

[0036] Figure 2 is a schematic diagram illustrating the formation principle of needle-like defects.

[0037] Figure 3 is a radial cross-sectional schematic diagram of existing filling and sealing technologies.

[0038] Figure 4 is a radial cross-sectional schematic diagram of the segmented filler layer of the present invention.

[0039] Figure 5 is a radial cross-sectional schematic diagram of the ring-shaped filler layer of the present invention.

[0040] Figure 6 is a schematic diagram of the structure of soft ceramic fiber cloth.

[0041] Figure 7 is a schematic diagram of the hard brick structure.

[0042] Figure 8 is a schematic diagram of the installation position of the heating element.

[0043] Wherein, 1 is the platinum body, 1-1 is the top horizontal section, 1-2 is the bottom horizontal section; 2 is the needle-like defect; 3 is the filler layer, 3-1 is the inner ring, 3-2 is the outer ring, 3-3 is the first filler layer, 3-4 is the second filler layer, 3-5 is the third filler layer; 4 is the flange, 4-1 is the platinum disc of the flange, 4-2 is the outer wall of the platinum disc of the flange; 5 is the heating element; 6 is the main section refractory structure; D is the equivalent diameter of the cross section; L is the length. Embodiments of the present invention

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0047] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0048] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. This is an explanation of the present invention and not a limitation thereof.

[0050] Before describing the specific filling structure and methods for reducing needle-like defects in substrate glass, the characteristics of needle-like defects in substrate glass are first explained. Referring to Figure 1, the morphological characteristics of needle-like defects in substrate glass are that of a defect with a very large ratio between the equivalent diameter and length of the cross-section, belonging to a typical morphological feature of crystals. Their length L is usually in the micrometer range, generally satisfying: 30μm < L < 600μm. After being magnified more than 5000 times by an electron microscope, their cross-sectional shape can be observed to mostly exhibit a polygonal or near-circular structure, with the equivalent diameter D generally satisfying: 0.5μm < D < 10μm. Elemental analysis using a scanning electron microscope revealed that the main component is Pt, with some defects also containing a certain proportion of Rh. The weight percentage of Pt satisfies: 70% < wt% < 100%, and the weight percentage of Rh satisfies: 0% < wt% < 22%.

[0051] Based on the fundamental characteristics of needle-like defects and combined with the high-temperature related theories of platinum-rhodium materials, the mechanism can be basically clarified. Specifically, from the perspective of high-temperature metal volatilization and saturated vapor pressure theory, in a high-temperature environment, the saturated vapor pressure of a substance increases with increasing temperature. For metallic elements in platinum, such as Pt and Rh, their vapor pressure will also increase accordingly under high temperature. When the actual vapor pressure in the environment is lower than the saturated vapor pressure of the metallic element at a specific temperature, the metal will continue to volatilize. Moreover, different metallic 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 under high temperature, causing the matrix material to continuously volatilize, especially in the platinum channel corresponding to the flange root region, where the temperature gradient is larger than in other main sections. Locally, due to the lower temperature, tiny needle-like defects may precipitate and adhere to the inner wall of the tube, accumulating continuously. The basic principle is shown in Figure 2. When internal airflow is disturbed or the liquid surface fluctuates, these crystals fall into the molten glass below, forming defects within the substrate glass product. These defects exhibit no clustering characteristic in the thickness and width directions of the glass substrate. In summary, the formation of needle-like defects involves multiple factors, including high-temperature oxidation of the platinum channel, material volatilization, temperature gradient, crystal precipitation, and internal airflow and liquid surface fluctuations. Among these factors, the most critical difference lies in the significant temperature difference between the inside and outside of the defect formation region. Specifically, the temperature T of the platinum body channel in the platinum disk region of the flange... b The temperature T of the platinum disc of the flange itself f The difference between them must be strictly controlled within T b -Tf Within the range of ≤ 210℃, this is a key control indicator derived from a series of high-temperature crystallization tests and comparative analysis with multi-wire production processes. It has considerable reference value and can effectively prevent the precipitation of needle-like defects.

[0052] Referring to Figure 3, the current filling and sealing scheme uses a hot, one-time filling method for this area. The filler layer is made of zirconium powder, and the entire structure is filled with zirconium, including the platinum body, the flange platinum disc, and all areas within the refractory material surrounding the flange connection. Due to its excellent high-temperature resistance and good strength after sintering, this material is widely used in the industry. While it can meet the requirement of maintaining the platinum body channel temperature T in the platinum disc area of ​​the flange... b The temperature is ≥1380℃, but the thermal conductivity of this type of material is about 2.5 W / (m·℃), so its thermal insulation performance is not ideal.

[0053] Therefore, this invention not only emphasizes the high-temperature resistance of materials but also focuses on improving thermal insulation performance, proposing a segmented and ring-shaped filling strategy. Specifically:

[0054] The present invention provides a filling structure for reducing needle-like defects in substrate glass, including a platinum body 1, a flange 4 and a main refractory structure 6. The flange 4 is sleeved on the platinum body 1. The main refractory structure 6 is provided on the outside of the platinum body 1. A filling layer 3 is provided in the cavity formed by the main refractory structure 6 and the outer wall of the platinum body 1. The filling layer 3 is a ring-shaped structure or a segmented structure.

[0055] The segmented structure includes an inner ring 3-1 and an outer ring 3-2. A partition device is provided at the junction of the inner ring 3-1 and the outer ring 3-2. The filling layer 3 of the inner ring 3-1 is the cavity between the outer wall of the platinum body 1 and the outer wall 4-2 of the platinum disc of the flange. The filling layer 3 of the outer ring 3-2 is the cavity between the outer wall 4-2 of the platinum disc of the flange and the main section refractory structure 6.

[0056] The segmented structure includes, from top to bottom, a first filler layer 3-3, a second filler layer 3-4, and a third filler layer 3-5. The first filler layer 3-3 is the cavity portion between the first horizontal section of the platinum disc 4-1 of the flange and the upper main refractory structure 6. The third filler layer 3-5 is the cavity portion between the second horizontal section of the platinum disc 4-1 of the flange and the lower main refractory structure 6. The second filler material is the cavity portion between the first horizontal section and the second horizontal section of the platinum disc 4-1 of the flange.

[0057] The first horizontal section of the platinum disc 4-1 of the flange is located 80-150 mm above the top horizontal section 1-1 of the platinum body 1; the second horizontal section of the platinum disc 4-1 of the flange is located 80-150 mm below the bottom horizontal section 1-2 of the platinum body 1.

[0058] In a specific embodiment of the present invention, referring to Figure 8, local auxiliary heating is applied to the filling structure that reduces needle-like defects 2 in the substrate glass to increase the overall temperature of that area. By adding multiple sets of heating elements 5 to the platinum disc 4-1 of the flange, direct heating of the exterior of the platinum body 1 is achieved, thereby increasing the temperature of the To. b The temperature and the temperature of its external area, the heating element 56 is a heating rod, which is arranged in multiple groups in the circumferential direction of the platinum body 1. The distance between the end of the heating rod and the platinum body 1 is 10mm~20mm. The material is either silicon molybdenum rod or platinum rod. The structure is either ring-shaped, sheet-shaped or wire-shaped.

[0059] Referring to Figures 6 and 7, specifically, when the filler layer 3 has a ring-shaped structure, the partition device is either a soft ceramic fiber cloth or a hard brick structure. 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.

[0060] Based on the same inventive concept, the present invention also provides a filling method for reducing needle-like defects in substrate glass, which includes the following steps when the filler layer 3 has a ring-shaped structure:

[0061] S1. Select the filler material for outer ring 3-2 and inner ring 3-1 to make the platinum body 1 channel temperature T in the platinum disc 4-1 area of ​​the flange reach a certain level. b Temperature T of the platinum disc 4-1 with the flange f Satisfy the following relationship: T b -T f ≤210℃, and T b ≥1380℃;

[0062] S2. Soft ceramic fiber cloth is used as the partition device between the inner ring 3-1 and the outer ring 3-2. It is placed inside the cavity in advance and the two ends of the soft ceramic fiber cloth are fixed by the clamping device.

[0063] S3. Fill 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 piece, and continue to fill the outer ring 3-2 until the filling is complete.

[0064] Based on the same inventive concept, the present invention also provides a filling method for reducing needle-like defects in substrate glass. When the filler layer 3 has a ring-shaped structure, the method includes the following steps:

[0065] S1. Select the filler material for outer ring 3-2 and inner ring 3-1 to make the platinum body 1 channel temperature T in the platinum disc 4-1 area of ​​the flange reach a certain level. b Temperature T of the platinum disc 4-1 with the flange f Satisfy the following relationship: T b -T f ≤210℃, and T b ≥1380℃;

[0066] S2. A rigid brick structure is used as the partition device between the inner ring 3-1 and the outer ring 3-2. The upper part of the rigid brick structure is a spliced ​​structure, and the lower part of the rigid brick structure is a detachable structure at the connection with the upper part. The lower part of the rigid brick structure is placed into the cavity in advance.

[0067] S3. First, complete the filling of the lower half of the inner ring 3-1 and the outer ring 3-2. Then, connect the lower half of the hard brick structure to the upper half and continue filling the inner ring 3-1. When the inner ring 3-1 is filled, splice the upper half of the hard brick structure into one piece and continue filling the outer ring 3-2 until the filling is complete.

[0068] Preferably, the inner ring 3-1 is filled with zirconium powder, and the outer ring 3-2 is filled with a material with a thermal conductivity of less than 1.0 W / (m·℃).

[0069] Preferably, the material with a thermal conductivity of less than 1.0 W / (m·℃) is alumina hollow sphere powder.

[0070] In a specific embodiment of the present invention, the inner diameter of the platinum disc 4-1 of the flange is 300 mm and the outer diameter is 500 mm. Referring to Figure 5, the inner ring 3-1, 100 mm thick from the platinum body 1, is filled with zirconium powder. Specifically, the first horizontal section of the platinum disc 4-1 is located 100 mm above the top horizontal section 1-1 of the platinum body 1; the second horizontal section of the platinum disc 4-1 is located 100 mm below the bottom horizontal section 1-2 of the platinum body 1. The outer ring 3-2 is filled with other materials. Based on the distance and thickness, the average thermal conductivity of these other materials needs to be below 1.0 W / (m·℃) to meet the temperature T of the platinum body 1 channel in the platinum disc 4-1 area of ​​the flange. b The temperature T of the platinum disc with the flange 4-1 f The control requirement is less than or equal to 210℃, and T bThe target temperature must reach above 1380℃. Because the actual structure of this area is not a completely open structure in four directions, and the filling process itself is a high-temperature operation, the effective operating time and space are limited. Therefore, direct operation cannot achieve the internal ring structure or near-ring structure shown in the figure. Thus, a simple and easy-to-install temporary partition structure is required.

[0071] Option 1: Referring to Figure 6, high-temperature resistant soft ceramic fiber cloth is used. This material is also commonly used in the substrate glass industry. Small pieces are often cut and used for fixing local areas such as thermocouples. In this option, the material is placed into the filling cavity in advance, and temporary clamping devices are fixed at both ends to support the soft ceramic fiber cloth to form a natural near-semi-circular structure. During filling, the inner ring 3-1 is filled with zirconium powder, and the outer ring 3-2 is filled with alumina hollow sphere powder. Finally, the entire soft ceramic fiber cloth is buried in the filling space to form an approximately circular structure in the core area.

[0072] Option 2: Refer to Figure 7. Use a hard brick structure, which is processed into two parts that can be disassembled and spliced. The lower part is a semi-circular structure, and the upper part is a disassembled arc-shaped plate structure. The hard brick structure is made of zircon material commonly used in this area. In actual filling, the upper and lower parts are filled in two separate times.

[0073] The materials used in the above two partition devices have been tested and verified in actual use. The platinum body of the platinum disc in area 4-1 of the flange has a temperature T in channel 1. b All reached 1401℃, and the temperature in this region was T b With T f The actual difference was 199℃, which met the design expectations. The number and size of this type of defect in the product were also reduced by about 70%, which is a significant effect.

[0074] Referring to Figure 4, in a specific embodiment of the present invention, the difference from the above embodiment is that the first horizontal section of the platinum disc 4-1 of the flange is located 80 mm above the top horizontal section 1-1 of the platinum body 1; the second horizontal section of the platinum disc 4-1 of the flange is located 80 mm below the bottom horizontal section 1-2 of the platinum body 1.

[0075] In a specific embodiment of the present invention, the difference from the above embodiment is that the first horizontal section of the platinum disc 4-1 of the flange is located 150 mm above the top horizontal section 1-1 of the platinum body 1; the second horizontal section of the platinum disc 4-1 of the flange is located 150 mm below the bottom horizontal section 1-2 of the platinum body 1.

[0076] Based on the same inventive concept, the present invention also provides a filling method for reducing needle-like defects in substrate glass, which includes the following steps when the filler layer 3 has a segmented structure:

[0077] S1. Select the filler materials for the first filler layer 3-3, the second filler layer 3-4, and the third filler layer 3-5 to bring the temperature T of the platinum body channel 1 in the platinum disc 4-1 area of ​​the flange to a certain level. b Temperature T of the platinum disc 4-1 with the flange f Satisfy the following relationship: T b -T f ≤210℃, and T b ≥1380℃;

[0078] S2. Fill the third filler layer 3-5, the second filler layer 3-4 and the first filler layer 3-3 in sequence.

[0079] Preferably, the second filler layer 3-4 is filled with zirconium powder, and the first filler layer 3-3 and the third filler layer 3-5 are both made of materials with an average thermal conductivity of less than 0.6 W / (m·℃).

[0080] Preferably, the material with an average thermal conductivity of less than 0.6 W / (m·℃) is: glass fiber cotton with a thermal conductivity of 0.28 W / (m·℃) and alumina hollow sphere powder with a thermal conductivity of 0.86 W / (m·℃), wherein the volume ratio of glass fiber cotton to alumina hollow sphere powder is 2:1, wherein the glass fiber cotton is a sheet material with a width of 10 mm, a length of 30 mm, and a thickness of 5 mm.

[0081] In a specific embodiment of the present invention, when the filler layer 3 has a segmented structure, the second filler layer 3-4 is filled with zirconium powder. Based on the distance and thickness estimation, the average thermal conductivity of the first filler layer 3-3 and the third filler layer 3-5 needs to be below 0.6 W / (m·℃) to meet the T requirement. b -T f ≤210℃, and T b To meet the target temperature requirement of ≥1380℃, this embodiment sacrifices some insulation efficiency for operability. Therefore, for the first filler layer 3-3 and the third filler layer 3-5, a novel filler material is selected, consisting of a mixture of two materials: glass fiber cotton (thermal conductivity approximately 0.28 W / (m·℃)) and alumina hollow sphere powder (thermal conductivity approximately 0.86 W / (m·℃)). Specifically, the finished glass fiber cotton is cut into sheets approximately 10mm wide, 30mm long, and 5mm thick using a cutting tool. This sheet is then mixed with alumina hollow spheres at a volume ratio of 2:1. The resulting mixture exhibits excellent insulation performance and better high-temperature resistance than individual insulation cotton. Practical application has verified that T... b Reaching 1392℃, and T b With degree T fThe actual difference was 206℃, which met the design expectations. The number and size of this type of defect in the product were also reduced by about 58%, which is a good result.

[0082] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A fill structure for reducing needle defects in a substrate glass, comprising: It includes a platinum body (1), a flange (4) and a main refractory structure (6). The flange (4) is fitted on the platinum body (1). The platinum body (1) is provided with a main refractory structure (6) on its exterior. A filling layer (3) is provided in the cavity formed by the main refractory structure (6) and the outer wall of the platinum body (1). The filling layer (3) is a ring-type structure or a segmented structure. The ring structure includes an inner ring (3-1) and an outer ring (3-2). A partition device is provided at the junction of the inner ring (3-1) and the outer ring (3-2). The filling layer (3) of the inner ring (3-1) is the cavity between the outer wall of the platinum body (1) and the outer wall (4-2) of the platinum disc of the flange. The filling layer (3) of the outer ring (3-2) is the cavity between the outer wall (4-2) of the platinum disc of the flange and the main section refractory structure (6). The segmented structure includes, from top to bottom, a first filler layer (3-3), a second filler layer (3-4), and a third filler layer (3-5). The first filler layer (3-3) is the cavity portion between the first horizontal section of the platinum disc (4-1) of the flange and the upper main refractory structure (6). The third filler layer (3-5) is the cavity portion between the second horizontal section of the platinum disc (4-1) of the flange and the lower main refractory structure (6). The second filler material is the cavity portion between the first horizontal section of the platinum disc (4-1) of the flange and the second horizontal section of the platinum disc (4-1). The first horizontal section of the platinum disc (4-1) of the flange is set 80-150mm above the top horizontal section (1-1) of the platinum body (1); the second horizontal section of the platinum disc (4-1) of the flange is set 80-150mm below the bottom horizontal section (1-2) of the platinum body (1).

2. The filling structure for reducing needle defects of a substrate glass according to claim 1, wherein It also includes several heating elements (5), which are disposed on the platinum plate (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 defects of a substrate glass according to claim 1, wherein When the filler layer (3) is a ring structure, the partition device is one of soft ceramic fiber cloth and hard brick structure. 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.

4. A method of reducing the population of needle defects in a substrate glass, comprising: Based on the filling structure for reducing needle-like defects in substrate glass as described in claim 1, when the filler layer (3) is a ring-shaped structure, the following steps are included: S1. Select the filler material for the outer ring (3-2) and inner ring (3-1) to make the platinum body (1) channel temperature T of the platinum disc (4-1) area of ​​the flange reach a certain value. b Temperature T of the platinum disc (4-1) of the flange f Satisfy the following relationship: T b -T f ≤210℃, and T b ≥1380℃; S2. Soft ceramic fiber cloth is used as the partition device between the inner ring (3-1) and the outer ring (3-2). It is placed inside the cavity in advance and the two ends of the soft ceramic fiber cloth are fixed by the clamping device. S3. Fill the outer ring (3-2) and 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 outer ring (3-2) until the filling is complete.

5. A method of reducing the population of needle defects in a substrate glass, the method comprising: Based on the filling structure for reducing needle-like defects in substrate glass as described in claim 1, when the filler layer (3) is a ring-shaped structure, the following steps are included: S1, selecting the packing of the outer ring (3-2) and the inner ring (3-1) so that the channel temperature T of the platinum body (1) in the area of the platinum disc (4-1) of the flange b with the temperature T of the platinum disc (4-1) of the flange f satisfies the following relationship: T b - T f ≤ 210°C, and T b ≥ 1380°C; S2. A rigid brick structure is used as the partition device for the inner ring (3-1) and the outer ring (3-2). The upper part of the rigid brick structure is a spliced ​​structure, and the lower part of the rigid brick structure is a detachable structure at the connection with the upper part. The lower part of the rigid brick structure is placed into 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 filling 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 filling the outer circle (3-2) until the filling is complete.

6. The method of claim 4 or 5, wherein the glass substrate is a glass sheet. The inner ring (3-1) is filled with zirconium powder, and the outer ring (3-2) is filled with a material with a thermal conductivity of less than 1.0 W / (m·℃).

7. The method of claim 6, wherein the method is performed at a temperature of 300 to 600 °C. The material with a thermal conductivity of less than 1.0 W / (m·℃) is alumina hollow sphere powder.

8. A method of reducing the population of needle defects in a substrate glass, the method comprising: Based on the filling structure for reducing needle-like defects in substrate glass as described in claim 1, when the filler layer (3) is a segmented structure, the following steps are included: S1, selecting a filler 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 area of the platinum disc (4-1) of the flange is b T f ≥ 1380℃ b -T f ≤ 210℃, and T b ≥ 1380℃ S2. Fill the third filler layer (3-5), the second filler layer (3-4), and the first filler layer (3-3) in sequence.

9. The method of claim 8, wherein the method is performed at a temperature of 300 to 600 °C. The second filler layer (3-4) uses zirconium powder, while the first filler layer (3-3) and the third filler layer (3-5) both use materials with an average thermal conductivity of less than 0.6 W / (m·℃).

10. The method of claim 9, wherein the method is performed at a temperature of 300 to 600 °C. The materials with an average thermal conductivity of less than 0.6 W / (m·℃) are: glass fiber cotton with a thermal conductivity of 0.28 W / (m·℃) and alumina hollow sphere powder with a thermal conductivity of 0.86 W / (m·℃). The volume ratio of glass fiber cotton to alumina hollow sphere powder is 2:

1. The glass fiber cotton is a sheet material with a width of 10 mm, a length of 30 mm, and a thickness of 5 mm.

Images