Optical fiber panel and its preparation method and application

Abstract

The present invention provides an optical fiber panel, a preparation method thereof and an application. The preparation method comprises the following steps: obtaining a blank of the optical fiber panel; the blank of the optical fiber panel comprises a plurality of optical fibers arranged in parallel; the optical fiber comprises a core rod glass and a cladding glass; the core rod glass does not contain alkali metal elements; calculated as oxides, the cladding glass contains 2.0-8.5 wt% of sodium element; the volume ratio of the core rod to the cladding is 6:4-8:2; placing the blank of the optical fiber panel in molten salt for ion exchange, cooling, soaking, cleaning and drying to obtain the optical fiber panel; the molten salt comprises KNO3, NaNO3, Al2O3, ZrO2, K2CO3 and K3PO4; the mass concentration of KNO3 is ≥95%, and NaNO3 ≥0.5%. The technical problem to be solved by the present invention is how to prepare an optical fiber panel with a smooth surface, significantly improved bending strength and impact resistance, and a simple preparation process, easy for batch production, good flexibility, high efficiency and relatively low production cost, so as to be more practical.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber panel enhancement technology, and in particular to an optical fiber panel and a preparation method and application thereof. Background Art

[0002] Optical fiber panel (hereinafter referred to as optical fiber panel) glass is a special optical glass, which is a two-dimensional array image transmission material composed of tens of millions or hundreds of millions of optical glass fibers. A single optical glass fiber is made of two types of glass: a high refractive index core and a low refractive index cortex. There is a good optical interface between the core and the cortex. The incident light is transmitted in the optical glass core in a manner similar to total reflection, from the input end face to the output end face. Optical fiber panels are mainly made of core materials, cortex materials, and light absorbing materials through processes such as drawing, typesetting, and thermal fusion. They are widely used in defense, aerospace, and civil electronics.

[0003] With the development of science and technology, lightweight ultra-thin fiber optic panels have become a new development trend, and higher requirements have been put forward for fiber optic panels. However, thin fiber optic panels face many technical bottlenecks that need to be overcome urgently, such as low bending strength and drop resistance, which restricts their further development. Therefore, improving the strength of fiber optic panels has important scientific research value. Ion exchange technology is a classic chemical tempering technology for strengthening thin glass, which has a good strengthening effect. However, the glass that makes up the fiber optic panel is different from the pure glass plate. The fiber optic panel is a two-dimensional array image transmission material composed of tens of millions or hundreds of millions of optical glass fibers. It has the special characteristics of core and skin chemical composition differences and periodic structure. Simply copying the strengthening technology of pure glass plates cannot improve the bending strength and impact resistance of the fiber optic panel. Moreover, the image transmission end face of the fiber optic panel strengthened by the strengthening method of the existing technology is not smooth enough, which affects the image transmission quality. Summary of the invention

[0004] The main purpose of the present invention is to provide a fiber optic panel and a preparation method and application thereof. The technical problem to be solved is how to prepare a fiber optic panel so that its surface is flat and smooth (surface roughness ≤ 0.007 μm), and its bending strength and impact resistance are significantly improved. Its bending strength is ≥ 700 MPa. An 80g steel ball is used to carry out an impact strength test on the fiber optic panel with a side length of 95 mm and a thickness of 1 mm, and its impact resistance height is ≥ 770 mm. Moreover, the preparation process is simple, easy to mass produce, flexible, efficient, and with relatively low production cost, so that it is more suitable for practical use.

[0005] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions. According to a method for preparing an optical fiber panel proposed in the present invention, the method comprises the following steps:

[0006] Obtain an optical fiber panel blank; the optical fiber panel blank comprises a plurality of optical fibers arranged in parallel; the optical fiber comprises a core rod glass and a tube glass; the core rod glass does not contain alkali metal elements; the tube glass contains 2.0 to 8.5 wt% of sodium elements in terms of oxide; the volume ratio of the core rod to the tube is 6:4 to 8:2;

[0007] The optical fiber panel blank is placed in molten salt for ion exchange, cooling, soaking, cleaning, and drying to obtain an optical fiber panel; the molten salt includes KNO 3 、NaNO 3 、Al 2 O 3 、ZrO 2 , K 2 CO 3 and K 3 PO 4 , where KNO 3 The mass concentration of NaNO is ≥95%, 3 ≥0.5%.

[0008] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0009] Preferably, in the aforementioned preparation method, the cross-section of the core rod is a circular cross-section, a square cross-section or a hexagonal cross-section; the leather tube is coaxially arranged with the core rod; the cross-section of the leather tube is an annular cross-section that matches the cross-sectional size and shape of the core rod.

[0010] Preferably, in the aforementioned preparation method, the optical fiber panel is composed of a plurality of rows of optical fibers; the optical fibers in two adjacent rows are aligned with each other or staggered by half a fiber.

[0011] Preferably, in the above-mentioned preparation method, the molten salt comprises, in terms of mass percentage: KNO 3 95-98.5%, NaNO 3 0.5%~2%,Al 2 O 3 0.1%~0.4%, ZrO 2 0.1%~0.2%, K 2 CO 3 0.2%~2% and K 3 PO 4 It is 0.2% to 2%.

[0012] Preferably, in the aforementioned preparation method, the ion exchange step is as follows:

[0013] The raw materials constituting the molten salt are mixed uniformly, heated to melt, and kept warm at the process temperature;

[0014] The optical fiber panel blank is heated to the process temperature and placed in a heat-insulating molten salt for heat preservation; after the heat preservation is completed, the optical fiber panel blank is taken out from the molten salt.

[0015] Preferably, in the aforementioned preparation method, the process temperature of the ion exchange is 350-650°C.

[0016] Preferably, in the aforementioned preparation method, the holding time of the ion exchange is 2 to 12 hours.

[0017] Preferably, in the aforementioned preparation method, the cooling is to uniformly reduce the temperature of the optical fiber faceplate blank to 80-100° C. within 0.5-24 hours.

[0018] Preferably, in the aforementioned preparation method, the soaking is to place the optical fiber faceplate blank in deionized water or distilled water for 2 to 4 hours to reduce the water temperature to room temperature.

[0019] The purpose of the present invention and the solution to its technical problems are also achieved by the following technical solutions. According to a fiber optic panel proposed by the present invention, it includes a plurality of optical fibers arranged in parallel; the optical fiber includes a core rod glass and a skin tube glass; the core rod glass does not include alkali metal elements; the skin tube glass contains 2.0 to 8.5 wt% of sodium elements; the volume ratio of the core rod glass to the skin tube glass is 6:4 to 8:2; part of the sodium elements in the skin tube glass are ion-exchanged with external potassium elements; the bending strength of the fiber optic panel is tested according to the industry standard JC / T 2130 to be ≥700MPa; the impact strength of the fiber optic panel is tested according to the national standard GB / T 39814, and an 80g steel ball is used to perform an impact strength test on the fiber optic panel with a side length of 95mm and a thickness of 1mm, and its impact resistance height is ≥770mm; the surface roughness of the fiber optic panel is ≤0.007μm.

[0020] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0021] Preferably, the aforementioned optical fiber panel is prepared according to the aforementioned preparation method.

[0022] The purpose of the present invention and the technical problems solved by the present invention are also achieved by the following technical solutions: According to the present invention, an application of the above-mentioned optical fiber panel in the fields of national defense, aerospace, and civil electronic technology is proposed.

[0023] By means of the above technical solution, the optical fiber panel and its preparation method and application proposed by the present invention have at least the following advantages:

[0024] The optical fiber panel and its preparation method and application proposed in the present invention are designed and improved by the core and skin components of the optical fiber panel, and the optical fiber panel is enhanced by a new ion exchange technology. The optical fiber panel strengthened by ion exchange is effectively strengthened by the component design of the molten salt. The enhanced optical fiber panel has excellent bending strength, impact resistance and surface roughness, and its bending strength is ≥700MPa; an 80g steel ball is used to conduct an impact strength test on the optical fiber panel with a side length of 95mm and a thickness of 1mm, and its impact resistance height is ≥770mm; and the smoothness of the image transmission end face of the optical fiber panel is effectively improved, and the surface roughness of the image transmission end face of the optical fiber panel is ≤0.007μm. At the same time, the technical solution of the present invention has relatively simple process operation, is easy to mass produce, has good flexibility, high efficiency, and relatively low production cost.

[0025] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the present invention with reference to the accompanying drawings and preferred embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the process of preparing the optical fiber panel of the present invention;

[0027] Figure 2 Schematic diagram of the structure of the optical fiber monofilament constituting the optical fiber panel of the present invention, wherein a is a circular structure, b is a square structure, and c is a hexagonal structure;

[0028] Figure 3 Schematic diagram of the arrangement of optical fibers in the optical fiber panel of the present invention, wherein a is a staggered arrangement and b is a parallel arrangement;

[0029] The above-mentioned Figures 1 to 3 middle, Indicates core glass, It means leather glass, It means the skin glass after ion exchange;

[0030] Figure 4 This is a photo of a fiber optic panel strengthened using the ion strengthening process in the prior art. DETAILED DESCRIPTION

[0031] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of a fiber optic panel and its preparation method and its specific implementation, structure, features and effects of the application according to the present invention in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0032] The present invention provides a method for preparing an optical fiber panel, which comprises the following steps: obtaining an optical fiber panel blank, and then chemically strengthening the optical fiber panel blank to obtain an optical fiber panel.

[0033] In the above technical solution, the optical fiber panel blank includes a plurality of optical fibers arranged in parallel; the optical fiber includes a core rod glass and a skin tube glass; the core rod glass does not include alkali metal elements; the skin tube glass contains 2.0 to 8.5 wt% of sodium element in terms of oxide; the volume ratio of the core rod to the skin tube is 6:4 to 8:2.

[0034] The optical fiber panel blank can be purchased directly from the market or prepared by oneself. Figure 1 The figure shows a schematic diagram of the optical fiber panel preparation process of self-made optical fiber panel blanks, wherein the optical fibers are first arranged in panels, and then the arranged optical fibers are hot-pressed and fused into optical fiber panel blanks, and then the optical fiber panel blanks are chemically strengthened to obtain optical fiber panels.

[0035] When preparing the fiber optic panel blank by yourself, you can make the ingredients according to the basic component formula of the conventional fiber optic panel core rod glass and the skin tube glass, and then add Na 2 O, so that the mass fraction of Na element in the skin glass is controlled at 2-8.5wt%; the specific steps are: respectively mixing and evenly stirring the weighed powders, then placing the mixed powders in a platinum crucible to melt the materials, preparing the glass according to the glass melting process, making the core glass into a rod, and drawing the skin tube glass into a tube; then calculating the proportion range of the core rod glass and the skin tube glass according to the proportion of the cross-sectional area (a plane perpendicular to the axis of the optical fiber) of the core rod glass and the skin tube glass; coaxially sleeve embedding the rod-shaped fiber core and the tubular skin, and then undergoing melting, primary wire drawing, primary plate arrangement, secondary wire drawing, secondary plate arrangement, re-melting hot pressing, cold processing and other processes, finally obtaining the optical fiber panel blank.

[0036] In the above technical solution, when chemically strengthening the optical fiber panel blank, the specific steps are: placing the optical fiber panel blank in molten salt for ion exchange, uniformly cooling, soaking, washing, and drying to obtain an optical fiber panel; the molten salt includes KNO 3 、NaNO 3 、Al 2 O 3 、ZrO 2 , K 2 CO 3 and K 3 PO 4 , where KNO 3 The mass concentration of NaNO is ≥95%, 3 ≥0.5%.

[0037] In the optical fiber panel of the present invention, since the core rod glass does not contain alkali metal, it will not undergo ion exchange during the subsequent chemical strengthening process; and the skin tube glass contains a certain amount of Na element, so the Na ions in the skin tube glass will undergo ion exchange with the K ions in the molten salt during the subsequent chemical strengthening process; and the skin tube glass and the core rod glass in the optical fiber panel are fused together as a whole, so when the skin tube glass is ion exchanged and strengthened, the influence of the interaction between the skin tube glass and the core rod glass must also be considered to control the force between the two to not exceed the critical value; otherwise, if the force between the two exceeds the critical value, collapse and cracking are likely to occur, causing damage to the optical fiber panel. The present invention effectively chemically strengthens the optical fiber panel by controlling the volume ratio of the core rod glass and the skin tube glass, as well as the components and ratios of the molten salt during chemical strengthening. Through the ion exchange of the skin tube glass, a strong compressive stress is generated on the surface of the skin glass, and the collapse and cracking defects caused by the interaction between the core and the skin interface are effectively avoided, so that the bending strength and impact resistance of the optical fiber panel are significantly improved. At the same time, the material composition of the core rod glass and the skin tube glass of the optical fiber panel is somewhat different, which leads to a certain difference in the hardness of the core rod glass and the skin tube glass; after the end face of the optical fiber panel is polished by conventional technology, a periodic array of concave and convex surfaces of nanometer scale will appear on its surface, thereby affecting the smoothness of the end face of the optical fiber panel; after ion exchange strengthening by the technical solution of the present invention, the core rod glass does not undergo ion exchange because it does not contain alkali metals, and the skin tube glass undergoes ion exchange because it contains a certain amount of alkali metals. After the exchange, the volume of the skin glass will expand, which will cause the skin layer to present an upper convex surface. The technical solution adds a certain proportion of sodium nitrate to the molten salt. Adding an appropriate amount of sodium nitrate to the molten salt can corrode the skin glass to a certain extent, and play a certain "de-convexing" role. Therefore, by properly adjusting the components and content of the molten salt, the end face surface of the prepared optical fiber panel can be made flat and smooth, thereby avoiding the influence of the poor end face flatness of the optical fiber panel after ion strengthening on the image transmission quality; and, if cold processing polishing technology is used to improve the end face flatness of the optical fiber panel, the thickness of the tempered layer will be reduced or the tempered layer formed by ion strengthening will be destroyed due to polishing to remove the convex surface. The technical solution of the present invention can solve the above problems well.

[0038] In some specific embodiments of the present invention, the cross-section of the core rod is a circular cross-section, a square cross-section or a hexagonal cross-section; in some specific embodiments, the cross-section of the core rod is preferably a circular cross-section, because the inner wall of the circular fiber core is flat and smooth, which is conducive to signal transmission; and the circular fiber core is easy to make, whether it is a drawn rod-shaped core glass or a tubular skin glass, the circular production cost is the lowest; however, after the circular fiber core structure is arranged, since there are certain gaps between the fibers, it is necessary to insert wires in the gaps, which may cause the effective transmission area of ​​the optical fiber panel to be reduced, and also has a certain effect on the thickness of the skin glass. , so in some specific embodiments, the cross-section of the core rod is preferably square or hexagonal with edges and corners. Although the square or hexagonal fiber core will lose part of the optical signal, and the preparation of the leather tube and the rod material is also difficult, the square and hexagonal fiber cores are more convenient in the subsequent panel arrangement stage, so that adjacent fiber cores can be arranged relatively closely together, reducing the gaps between the fiber cores, while also increasing the volume ratio of the fiber cores, greatly improving the effective transmission cross-section of the optical fiber panel; the leather tube is coaxially arranged with the core rod; the cross-section of the leather tube is an annular cross-section that matches the cross-sectional size and shape of the core rod, as shown in the attached drawings. Figure 2 As shown in a, b, and c.

[0039] In some specific embodiments of the present invention, the optical fiber panel is composed of a plurality of rows of optical fibers; the optical fibers in two adjacent rows are staggered by half an optical fiber or aligned with each other, as shown in the attached figure. Figure 3 As shown in a and b, attached Figure 3 The arrangement in a is also called staggered arrangement. In this arrangement, the optical fibers are staggered with each other, which can make the arrangement of the optical fibers more compact. Figure 3 The arrangement in method b is also called parallel arrangement; this arrangement is adopted under certain special requirements. For example, if the cross-section of the monofilament is square, it is more practical to adopt a parallel arrangement.

[0040] In some specific embodiments of the present invention, the molten salt comprises, by weight percentage: KNO 3 95-98.5%, NaNO 3 0.5%~2%,Al 2 O 3 0.1%~0.4%, ZrO 2 0.1%~0.2%, K 2 CO 3 0.2%~2% and K 3 PO 4 It is 0.2% to 2%.

[0041] In the above technical solution, adding an appropriate amount of sodium nitrate to the molten salt can corrode the skin glass to a certain extent, that is, it can partially offset the volume expansion effect of the skin material caused by ion strengthening, and play a certain "de-convexing" role. Therefore, by properly adjusting the composition and content of the molten salt, the surface of the prepared optical fiber panel is made flat and smooth.

[0042] The molten salt also includes ZrO 2 With Al 2 O 3 , where Al 2 O 3 It mainly plays the role of adsorbing impurities, which can precipitate insoluble matter at the bottom of the molten salt, thereby eliminating the impurities' hindering effect on ion exchange; however, Al 2 O 3 Too little or too much content will reduce the efficiency of ion exchange; when its content is too little, it will lead to weak ability to adsorb impurities; and when its content is too much, it will cause turbidity of the molten salt, and it will become an impurity itself and affect the ion strengthening effect; ZrO 2 The role of Al 2 O 3 Similarly, it absorbs and precipitates different impurities in the molten salt. 2 With Al 2 O 3 When used together, molten salt has a better ion exchange effect on the optical fiber panel.

[0043] The molten salt also includes K 2 CO 3 With K 3 PO 4 , K 2 CO 3 With K 3 PO 4 Both have the function of purifying molten salt. They can react with Ca in molten salt. 2+ , Sr 2+ The impurity ions react chemically to generate compounds with high melting points or low solubility. When the content is too low, the purification effect is not obvious, which may lead to low ion exchange efficiency. When the content is too high, due to K 2 CO 3 With K 3 PO 4 The melting points of all these substances are higher than potassium nitrate, which may cause the molten salt to be insoluble and will change the temperature system of the entire molten salt.

[0044] In some specific embodiments of the present invention, the steps of ion exchange are as follows:

[0045] The first step is to mix the raw materials that make up the molten salt evenly and heat them to melt them; the container material for heating and melting the molten salt can be made of high-temperature resistant stainless steel or 316 stainless steel; if the molten salt is a repeatedly used molten salt, this step is not required; if the molten salt is used for the first time, this step is required; when the molten salt is used for the first time, it should be heated and melted and then allowed to stand for 24 hours before being used; the technical purpose of such a setting is that the molten salt for ion exchange requires sufficient clarification, and since the molten salt is a mixture, the water content in the molten salt is relatively high when it is first heated and melted, and therefore, it may contain water during the initial heating process, and sufficient time is required for clarification to facilitate the quality of subsequent ion exchange.

[0046] Secondly, the molten salt is heated to a preset ion exchange process temperature and kept warm so that the temperature of the molten salt is uniform throughout the molten salt. In order to heat the molten salt evenly and avoid problems such as container explosion, the present invention preferably heats the temperature slowly, which can be a heating rate of 15 to 250°C / min. In the subsequent embodiments of the present invention, the heating rate is 20°C / min.

[0047] The preferred process temperature of ion exchange in the present invention is 350-650°C. If the temperature is too high, the glass may soften during ion exchange, which is equivalent to a certain annealing effect on the glass, that is, the stress of the glass is eliminated, causing stress relaxation of the glass. The purpose of ion exchange is to generate stress on the glass, that is, the temperature is too high to achieve the purpose of tempering the glass by ion exchange, which affects the effect of ion exchange. In addition, molten salt is easy to volatilize and decompose. If the temperature is too low, the efficiency of ion exchange may be reduced, and the exchange depth and exchange amount are reduced, thereby reducing the strength of the glass. The present invention further preferably has the process temperature of 430-480°C.

[0048] The fiber panel blank is heated to the above-mentioned process temperature and placed in an insulating molten salt for insulation. In the specific operation, the fiber panel blank can be fixed in a 316 stainless steel bracket, and the bracket is placed in another preheating furnace, and the furnace temperature is set to slowly rise to the above-mentioned process temperature, and the heating rate is preferably 5-15°C / min. The subsequent embodiments of the present invention are all heated at a heating rate of 10°C / min. After heating to the target temperature, the 316 stainless steel bracket is quickly placed in the molten salt in the tempering furnace, the crucible lid is covered, and the furnace door is closed for insulation. In order to ensure the effect of chemical strengthening, the present invention preferably has an ion exchange insulation time of 2-12h. If the chemical strengthening time is too short, it will lead to insufficient depth of ion exchange and reduced efficiency of ion exchange, thereby affecting the exchange effect. If the chemical strengthening time is too long, it will cause glass stress relaxation, which will also lose the strengthening effect of the glass. The present invention further preferably has an ion exchange insulation time of 4-8h.

[0049] Secondly, after the insulation is completed, the fiber optic panel blank is taken out from the molten salt for uniform cooling. It should be noted that the uniform cooling here is different from annealing, which will not eliminate the stress of the strengthened glass, but keep its stress. In the specific operation, the 316 stainless steel bracket carrying the fiber optic panel is taken out from the molten salt, and after the molten salt is dripped dry, it is quickly placed in the preheating furnace, and the furnace temperature is uniformly cooled from the chemical strengthening process temperature to 80-100°C at a constant speed within 0.5-24 hours, so that it is evenly cooled; the purpose of such a setting is that too fast cooling may cause cracks and bursts in the glass, especially for chemically strengthened glass, because its surface has a large stress, so it is preferred to cool steadily and evenly to prevent cracks and bursts in the strengthened glass.

[0050] Finally, the cooled tempered optical fiber panel is immersed in a deionized water or distilled water cleaning tank with a water temperature of 50-75°C for 2-4 hours. The purpose of this setting is that warm water cooling is more moderate than air cooling, and the initial temperature of the warm water is close to the cooled glass, which can better protect the glass from temperature shock. At the same time, warm water can better dissolve and clean the residual molten salt on the surface of the glass, which can play a better cleaning role. After the water temperature is naturally cooled to near room temperature, take out the sample for cleaning and drying.

[0051] The present invention also proposes an optical fiber panel, which includes a plurality of optical fibers arranged in parallel; the optical fiber includes a core rod glass and a tube glass; the core rod glass does not include alkali metal elements; the tube glass contains 2.0 to 8.5 wt% of sodium elements; the volume ratio of the core rod glass to the tube glass is 6:4 to 8:2; part of the sodium elements in the tube glass are ion-exchanged with external potassium elements; the bending strength of the optical fiber panel is tested to be ≥700MPa according to the industry standard JC / T 2130; the impact strength of the optical fiber panel is tested according to the national standard GB / T 39814, and an 80g steel ball is used to perform an impact strength test on the optical fiber panel with a side length of 95mm and a thickness of 1mm, and its impact resistance height is ≥770mm; the surface roughness of the optical fiber panel is ≤0.007μm.

[0052] The optical fiber panel is preferably prepared according to the aforementioned preparation method.

[0053] The present invention also proposes an application of the aforementioned optical fiber panel in the fields of national defense, aerospace, and civil electronic technology.

[0054] The present invention will be further described below in conjunction with specific embodiments, but this should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by technicians in this field based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0055] Unless otherwise specified, the materials, reagents, etc. involved below are all commercially available products well known to those skilled in the art; unless otherwise specified, the methods described are all methods well known in the art. Unless otherwise defined, the technical terms or scientific terms used should have the common meanings understood by ordinary technicians in the field to which the present invention belongs.

[0056] The basic component formulas of the core rod glass and the tube glass in the optical fiber panel in the following embodiments are all based on the formulas of the core rod glass and the tube glass in the conventional optical fiber panel in the technical field; in Example 1, the core rod glass formula does not include alkali metal elements, and the specific formula is as follows: SiO 2 (38.8wt%), BaO (23.1wt%), La 2 O 3 (22.3wt%), Nb 2 O 5 (10.8wt%), TiO 2 (5wt%); the leather tube glass formula includes Na element, the specific formula is as follows: SiO 2 (81.9wt%), K 2 O(8.1wt%), Na 2 O (6.0wt%), CaO (1.7wt%), Al 2 O 3 (1.6wt%), MgO (0.7wt%); the above formula of core rod glass and formula of skin tube glass are only exemplary descriptions and do not constitute specific limitations on the present invention.

[0057] The performance evaluation method of the optical fiber panel is as follows:

[0058] 1. According to the industry standard JC / T 2130-2012, the bending strength of the ion exchange tempered optical fiber panel is tested using the double ring method;

[0059] 2. According to the national standard GB / T 39814-2021 ultra-thin glass impact strength test method, the impact strength of the ion exchange tempered fiber optic panel is tested. An 80g steel ball is used to conduct an impact strength test on a reinforced fiber optic panel with a side length of 95mm and a thickness of 1mm;

[0060] 3. The surface roughness test of the optical fiber panel adopts the conventional test method in this field, and the specific method is not limited.

[0061] Embodiment 1:

[0062] This embodiment prepares a fiber optic panel, which specifically includes the following steps:

[0063] 1) Preparation of optical fiber panel blanks

[0064] a. Prepare the core rod glass ingredients: mix the raw material powders and stir them evenly, then place the mixed powders in a platinum crucible to melt the materials, prepare the glass according to the glass melting process, and make it into a rod shape.

[0065] b. Ingredients for leather tube glass: the mass fraction of Na element in the leather tube glass component is 6 parts by mass as oxide; the raw material powders are mixed and stirred evenly, and then the mixed powder is placed in a platinum crucible for melting, and the glass is prepared according to the glass melting process and drawn into a tube.

[0066] c. The rod-shaped fiber core and the tubular sheath are coaxially combined in a sleeve; when combined, the core-sheath glass ratio range is calculated based on the cross-sectional area ratio of the core rod glass and the sheath tube glass, and the core-sheath ratio is 7:3.

[0067] d. After melting, primary wire drawing, primary plate arrangement, secondary wire drawing, secondary plate arrangement, hot pressing fusion and cold processing, the optical fiber panel blank is obtained.

[0068] In this embodiment, the diameter of a single optical fiber of the optical fiber panel is 4 μm, and the core and the sheath are coaxial circular structures, such as Figure 2 As shown in a, the periodic arrangement is as shown in the attached Figure 3 As shown in a.

[0069] e. Process the optical fiber panel into small discs with a diameter of 20 mm and a thickness of 1 mm and squares with a side length of 95 mm and a thickness of 1 mm, and polish both sides of the discs and squares.

[0070] 2) Ion exchange strengthening and post-treatment of optical fiber panels

[0071] f. Prepare 10kg ion exchange molten salt, KNO 3 The raw material purity is ≥98wt%, and the remaining additives are analytically pure. The addition amount of each component is as follows: KNO 3 9600g, NaNO 3 150g, Al 2 O 3 20g, ZrO 2 10g, K 2 CO 3 200g, K 3 PO 4 The mixture is 20 g, the molten salt is mixed evenly, and then placed in a 316 stainless steel crucible. The crucible containing the molten salt is placed in a tempering furnace and heated to 470°C at a heating rate of 20°C / min, and then kept warm for 24 hours.

[0072] g. Fix the prepared optical fiber panel blank in a 316 stainless steel bracket, and place the bracket in another preheated tempering furnace. Set the furnace temperature to rise from room temperature to 470°C at a heating rate of 10°C / min. Quickly place the 316 stainless steel bracket in the molten salt in the tempering furnace, cover the crucible lid, close the furnace door and keep warm for 6 hours.

[0073] h. Take out the 316 stainless steel bracket with the optical fiber panel, and after the molten salt is dried, quickly place it in the preheating furnace, and cool the furnace temperature from 470℃ to 80℃ at a constant speed for 20 hours. Soak the tempered optical fiber panel in a cleaning tank with a water temperature of 60℃, using deionized water or distilled water for 2 hours. After the water temperature cools naturally to near room temperature, take out the sample, clean it, and dry it.

[0074] The test results are shown in Table 1.

[0075] Comparative Example 1-1

[0076] Same as Example 1, except that the chemical strengthening step is omitted. The test results are shown in Table 1.

[0077] Comparative Example 1-2

[0078] Same as Example 1, except that the chemical strengthening method in the prior art is used for chemical strengthening; the molten salt composition is 15% sodium nitrate and 85% potassium nitrate, and the ion exchange temperature is 460°C; the results are shown in the attached Figure 4 As shown in the figure, it can be seen that the skin glass is convex as a whole after ion exchange, the core glass is concave, and the end face of the optical fiber panel has an overall honeycomb structure, which makes it impossible to transmit images; and the stress of the optical fiber panel is uneven and easy to crack.

[0079] Embodiment 2:

[0080] This embodiment prepares a fiber optic panel, which specifically includes the following steps:

[0081] 1) Preparation of optical fiber panel blanks

[0082] a. Prepare the core rod glass ingredients: mix the raw material powders and stir them evenly, then place the mixed powders in a platinum crucible to melt the materials, prepare the glass according to the glass melting process, and make it into a rod shape.

[0083] b. Preparation of leather tube glass, wherein the mass fraction of Na element in the leather tube glass component is 8.5 parts in terms of oxide (relative to Example 1, only the sodium oxide content is adjusted from 6 parts to 8.5 parts, and the mass fractions of other components remain unchanged); the raw material powders are mixed and uniformly stirred, and then the mixed powder is placed in a platinum crucible for melting, and the glass is prepared according to the glass melting process and drawn into a tube.

[0084] c. The rod-shaped fiber core and the tubular sheath are coaxially sleeved together; when combined, the core-sheath glass ratio range is calculated based on the cross-sectional area ratio of the core rod glass and the sheath tube glass, and the core-sheath ratio is 6:4.

[0085] d. After melting, primary wire drawing, primary plate arrangement, secondary wire drawing, secondary plate arrangement, hot pressing fusion and cold processing, the optical fiber panel blank is obtained.

[0086] In this embodiment, the diameter of a single optical fiber of the optical fiber panel is 5 μm, and the core and the sheath are coaxial circular structures, such as Figure 2 As shown in b, the periodic arrangement is as shown in the attached Figure 3 As shown in a.

[0087] e. Process the optical fiber panel into small discs with a diameter of 20 mm and a thickness of 1 mm and squares with a side length of 95 mm and a thickness of 1 mm, and polish both sides of the discs and squares.

[0088] 2) Ion exchange strengthening and post-treatment of optical fiber panels

[0089] f. Prepare 10kg ion exchange molten salt, KNO 3 The raw material purity is ≥98wt%, and the remaining additives are analytically pure. The addition amount of each component is as follows: KNO 3 9620g, NaNO 3 For 100g, Al 2 O 3 40g, ZrO 2 20g, K 2 CO 3 20g, K 3 PO 4 The mixture is 200 g. After the formula molten salt is evenly mixed, it is placed in a 316 stainless steel crucible. The crucible containing the molten salt is placed in a tempering furnace and heated to 470°C at a heating rate of 20°C / min, and then kept warm for 24 hours.

[0090] g. Fix the prepared optical fiber panel blank in a 316 stainless steel bracket, and place the bracket in another preheated tempering furnace. Set the furnace temperature to rise from room temperature to 470°C at a heating rate of 10°C / min. Quickly place the 316 stainless steel bracket in the molten salt in the tempering furnace, cover the crucible lid, close the furnace door and keep warm for 6 hours.

[0091] h. Take out the 316 stainless steel bracket with the optical fiber panel, and after the molten salt is dried, quickly place it in the preheating furnace, and cool the furnace temperature from 470℃ to 80℃ at a constant speed for 20 hours. Soak the tempered optical fiber panel in a cleaning tank with a water temperature of 60℃, using deionized water or distilled water for 2 hours. After the water temperature cools naturally to near room temperature, take out the sample, clean it, and dry it.

[0092] According to tests, the optical fiber panel prepared in this embodiment has a bending strength of up to 752 MPa, an impact resistance height of 800 mm, and a surface roughness Ra of 0.005 μm.

[0093] Comparative Example 2-1

[0094] Same as Example 2, except that the chemical strengthening step is omitted. The test results are shown in Table 1.

[0095] Comparative Example 2-2

[0096] Same as Example 2, except that the chemical strengthening method in the prior art is used for chemical strengthening, the molten salt composition and ion exchange temperature are the same as those of Comparative Example 1-2, and the results after ion strengthening are the same as those of Comparative Example 1-2.

[0097] Embodiment 3:

[0098] This embodiment prepares a fiber optic panel, which specifically includes the following steps:

[0099] 1) Preparation of optical fiber panel blanks

[0100] a. Prepare the core rod glass ingredients: mix the raw material powders and stir them evenly, then place the mixed powders in a platinum crucible to melt the materials, prepare the glass according to the glass melting process, and make it into a rod shape.

[0101] b. Preparation of leather tube glass, wherein the mass fraction of Na element in the leather tube glass component is 2 parts in terms of oxide (relative to Example 1, only the sodium oxide content is adjusted from 6 parts to 2 parts, and the mass fractions of other components remain unchanged); the raw material powders are mixed and uniformly stirred, and then the mixed powder is placed in a platinum crucible for melting, and the glass is prepared according to the glass melting process and drawn into a tube.

[0102] c. The rod-shaped fiber core and the tubular sheath are coaxially combined in a sleeve; when combined, the core-sheath glass ratio range is calculated based on the cross-sectional area ratio of the core rod glass and the sheath tube glass, and the core-sheath ratio is 8:2.

[0103] d. After melting, primary wire drawing, primary plate arrangement, secondary wire drawing, secondary plate arrangement, hot pressing fusion and cold processing, the optical fiber panel blank is obtained.

[0104] In this embodiment, the diameter of a single optical fiber of the optical fiber panel is 4 μm, and the core and the sheath are coaxial circular structures, such as Figure 2 As shown in c, the periodic arrangement is as shown in the attached Figure 3 As shown in b.

[0105] e. Process the optical fiber panel into small discs with a diameter of 20 mm and a thickness of 1 mm and squares with a side length of 95 mm and a thickness of 1 mm, and polish both sides of the discs and squares.

[0106] 2) Ion exchange strengthening and post-treatment of optical fiber panels

[0107] f. Prepare 10kg ion exchange molten salt, KNO 3 The raw material purity is ≥98wt%, and the remaining additives are analytically pure. The addition amount of each component is as follows: KNO 3 9500g, NaNO 3 200g, Al 2 O 3 30g, ZrO 2 20g, K 2 CO 3 150g, K 3 PO 4 The mixture is 100 g, the molten salt is mixed evenly, and then placed in a 316 stainless steel crucible. The crucible containing the molten salt is placed in a tempering furnace and heated to 470°C at a heating rate of 20°C / min, and then kept warm for 24 hours.

[0108] g. Fix the prepared optical fiber panel blank in a 316 stainless steel bracket, and place the bracket in another preheated tempering furnace. Set the furnace temperature to rise from room temperature to 470°C at a heating rate of 10°C / min. Quickly place the 316 stainless steel bracket in the molten salt in the tempering furnace, cover the crucible lid, close the furnace door and keep warm for 6 hours.

[0109] h. Take out the 316 stainless steel bracket with the optical fiber panel, and after the molten salt is dried, quickly place it in the preheating furnace, and cool the furnace temperature from 470℃ to 80℃ at a constant speed for 20 hours. Soak the tempered optical fiber panel in a cleaning tank with a water temperature of 60℃, using deionized water or distilled water for 2 hours. After the water temperature cools naturally to near room temperature, take out the sample, clean it, and dry it.

[0110] The test results are shown in Table 1.

[0111] Comparative Example 3-1

[0112] Same as Example 3, except that the chemical strengthening step is omitted. The test results are shown in Table 1.

[0113] Comparative Example 3-2

[0114] Same as Example 3, except that the chemical strengthening method in the prior art is used for chemical strengthening, the molten salt composition and ion exchange temperature are the same as those of Comparative Example 1-2, and the results after ion strengthening are the same as those of Comparative Example 1-2.

[0115] Embodiment 4:

[0116] This embodiment prepares a fiber optic panel, which specifically includes the following steps:

[0117] 1) Preparation of optical fiber panel blanks

[0118] a. Prepare the core rod glass ingredients: mix the raw material powders and stir them evenly, then place the mixed powders in a platinum crucible to melt the materials, prepare the glass according to the glass melting process, and make it into a rod shape.

[0119] b. Preparation of leather tube glass, wherein the mass fraction of Na element in the leather tube glass component is 4 parts in terms of oxide (relative to Example 1, only the sodium oxide content is adjusted from 6 parts to 4 parts, and the mass fractions of other components remain unchanged); the raw material powders are mixed and uniformly stirred, and then the mixed powder is placed in a platinum crucible for melting, and the glass is prepared according to the glass melting process and drawn into a tube.

[0120] c. The rod-shaped fiber core and the tubular sheath are coaxially sleeved together; when combined, the core-sheath glass ratio range is calculated based on the cross-sectional area ratio of the core rod glass and the sheath tube glass, and the core-sheath ratio is 6:4.

[0121] d. After melting, primary wire drawing, primary plate arrangement, secondary wire drawing, secondary plate arrangement, hot pressing fusion and cold processing, the optical fiber panel blank is obtained.

[0122] In this embodiment, the diameter of a single optical fiber of the optical fiber panel is 5 μm, and the core and the sheath are coaxial circular structures, such as Figure 2 As shown in a, the periodic arrangement is as shown in the attached Figure 3 As shown in b.

[0123] e. Process the optical fiber panel into small discs with a diameter of 20 mm and a thickness of 1 mm and squares with a side length of 95 mm and a thickness of 1 mm, and polish both sides of the discs and squares.

[0124] 2) Ion exchange strengthening and post-treatment of optical fiber panels

[0125] f. Prepare 10kg ion exchange molten salt, KNO 3 The raw material purity is ≥98wt%, and the remaining additives are analytically pure. The addition amount of each component is as follows: KNO 3 9800g, NaNO 3 50g, Al 2 O3 10g, ZrO 2 10g, K 2 CO 3 50g, K 3 PO 4 The mixture is 80 g. After the formula molten salt is evenly mixed, it is placed in a 316 stainless steel crucible. The crucible containing the molten salt is placed in a tempering furnace and heated to 470°C at a heating rate of 20°C / min, and then kept warm for 24 hours.

[0126] g. Fix the prepared optical fiber panel blank in a 316 stainless steel bracket, and place the bracket in another preheated tempering furnace. Set the furnace temperature to rise from room temperature to 470°C at a heating rate of 10°C / min. Quickly place the 316 stainless steel bracket in the molten salt in the tempering furnace, cover the crucible lid, close the furnace door and keep warm for 6 hours.

[0127] h. Take out the 316 stainless steel bracket with the optical fiber panel, and after the molten salt is dried, quickly place it in the preheating furnace, and cool the furnace temperature from 470℃ to 80℃ at a constant speed for 20 hours. Soak the tempered optical fiber panel in a cleaning tank with a water temperature of 60℃, using deionized water or distilled water for 2 hours. After the water temperature cools naturally to near room temperature, take out the sample, clean it, and dry it.

[0128] The test results are shown in Table 1.

[0129] Comparative Example 4-1

[0130] Same as Example 4, except that the chemical strengthening step is omitted. The test results are shown in Table 1.

[0131] Comparative Example 4-2

[0132] Same as Example 4, except that the chemical strengthening method in the prior art is used for chemical strengthening, the molten salt composition and ion exchange temperature are the same as those of Comparative Example 1-2, and the results after ion strengthening are the same as those of Comparative Example 1-2.

[0133] Table 1

[0134] Bending strength, MPa Impact resistance height, mm Surface roughness, μm Example 1 770 850 0.006 Comparative Example 1-1 183 250 0.015 Example 2 752 800 0.005 Comparative Example 2-1 175 200 0.018 Example 3 784 900 0.006 Comparative Example 3-1 186 300 0.015 Example 4 759 800 0.005 Comparative Example 4-1 184 250 0.018

[0135] It can be seen from the test data in Table 1 that compared with the optical fiber panel not strengthened by ion exchange, the performance of the optical fiber panel strengthened by ion exchange using the technical solution of the present invention is greatly improved. Specifically, its bending strength is increased from more than 100 MPa to more than 700 MPa, an increase of more than 300%; its impact resistance height is increased from more than 200 mm to more than 800 mm, an increase of more than 200%; its surface roughness is improved from 0.015-0.018 μm to 0.005-0.006 μm, indicating that the technical solution of the present invention has an excellent effect on the ion exchange enhancement of the optical fiber panel.

[0136] Embodiments 5 to 8

[0137] Same as Example 1, except that the process temperatures are 350°C, 430°C, 480°C and 650°C respectively. The test results are shown in Table 2.

[0138] Table 2

[0139] Bending strength, MPa Impact resistance height, mm Surface roughness, μm Example 5 702 775 0.006 Example 6 758 837 0.006 Example 7 767 847 0.006 Example 8 714 788 0.007

[0140] It can be seen from the test data in Table 2 that the ion exchange process temperature can achieve good technical effects at 350-650°C, and the technical effect will be better when the ion exchange process temperature is 430-480°C.

[0141] Examples 9 to 12

[0142] Same as Example 1, except that the insulation time is 2h, 4h, 8h and 12h respectively. The test results are shown in Table 3.

[0143] Table 3

[0144] Bending strength, MPa Impact resistance height, mm Surface roughness, μm Example 9 700 773 0.006 Example 10 781 862 0.006 Embodiment 11 783 864 0.006 Example 12 712 786 0.007

[0145] It can be seen from the test data in Table 3 that a good technical effect can be achieved when the ion exchange insulation time is 2 to 12 hours, and the technical effect will be better when the ion exchange insulation time is 4 to 8 hours.

[0146] Embodiments 13 to 16

[0147] Same as Example 1, except that the cooling time is 0.5h, 8h, 16h and 24h respectively. The test results are shown in Table 4.

[0148] Table 4

[0149] Bending strength, MPa Impact resistance height, mm Surface roughness, μm Embodiment 13 711 785 0.006 Embodiment 14 754 832 0.006 Embodiment 15 766 846 0.006 Example 16 768 848 0.006

[0150] It can be seen from the test data in Table 4 that a uniform cooling time of 0.5 to 24 hours can achieve good technical effects. As the time for uniform cooling to a specific temperature increases, that is, the cooling rate slows down, the technical effect of the obtained optical fiber panel is better. Considering the process efficiency comprehensively, the preferred uniform cooling time of the present invention is 0.5 to 24 hours.

[0151] The technical features in the claims and / or the specification of the present invention may be combined, and the combination is not limited to the combination obtained by reference in the claims. The technical solution obtained by combining the technical features in the claims and / or the specification is also within the protection scope of the present invention.

[0152] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A method for preparing an optical fiber panel, It is characterized in that It includes the following steps: Obtain an optical fiber panel blank; the optical fiber panel blank comprises a plurality of optical fibers arranged in parallel; the optical fiber comprises a core rod glass and a tube glass; the core rod glass does not contain alkali metal elements; the tube glass contains 2.0-8.5wt% of sodium element in terms of oxide; the volume ratio of the core rod to the tube is 6:4-8:2; The optical fiber panel blank is placed in molten salt for ion exchange, cooling, soaking, cleaning, and drying to obtain an optical fiber panel; the molten salt includes KNO 3 、NaNO 3 、Al 2 O 3 、ZrO 2 , K 2 CO 3 and K 3 PO 4 , where KNO 3 The mass concentration of NaNO is ≥95%, 3 ≥0.5%.

2. The preparation method according to claim 1, It is characterized in that The cross section of the core rod is a circular cross section, a square cross section or a hexagonal cross section; the leather tube is coaxially arranged with the core rod; the cross section of the leather tube is an annular cross section matching the cross section size and shape of the core rod.

3. The preparation method according to claim 1, It is characterized in that The optical fiber panel is composed of a plurality of rows of optical fibers; the optical fibers in two adjacent rows are aligned with each other or staggered by half an optical fiber.

4. The preparation method according to claim 1, It is characterized in that In terms of mass percentage, the molten salt includes: KNO 3 95~98.5%, NaNO 3 0.5%~2%, Al 2 O 3 0.1%~0.4%, ZrO 2 0.1%~0.2%, K 2 CO 3 0.2%~2% and K 3 PO 4 It is 0.2%~2%.

5. The preparation method according to claim 1, It is characterized in that The steps of the ion exchange are as follows: The raw materials constituting the molten salt are mixed uniformly, heated to melt, and kept warm at the process temperature; The optical fiber panel blank is heated to the process temperature and placed in a heat-insulating molten salt for heat preservation; after the heat preservation is completed, the optical fiber panel blank is taken out from the molten salt.

6. The preparation method according to claim 5, It is characterized in that The process temperature of the ion exchange is 350-650°C.

7. The preparation method according to claim 5, It is characterized in that The holding time of the ion exchange is 2 to 12 hours.

8. The preparation method according to claim 1, It is characterized in that The temperature reduction is to uniformly reduce the temperature of the optical fiber faceplate blank to 80-100° C. within 0.5-24 hours.

9. The preparation method according to claim 1, It is characterized in that The soaking is to place the optical fiber panel blank in deionized water or distilled water for 2 to 4 hours to reduce the water temperature to room temperature.

10. A fiber optic panel, It is characterized in that The invention discloses a fiber optic panel comprising a plurality of optical fibers arranged in parallel; the optical fibers comprise a core rod glass and a tube glass; the core rod glass does not contain alkali metal elements; the tube glass contains 2.0-8.5wt% of sodium elements; the volume ratio of the core rod glass to the tube glass is 6:4-8:2; part of the sodium elements in the tube glass are ion-exchanged with external potassium elements; the bending strength of the optical fiber panel is tested to be ≥700MPa according to the industry standard JC / T 2130; the impact strength of the optical fiber panel is tested according to the national standard GB / T 39814, and an 80g steel ball is used to perform an impact strength test on the optical fiber panel with a side length of 95mm and a thickness of 1mm, and the impact resistance height is ≥770mm; the surface roughness of the optical fiber panel is ≤0.007μm.

11. The optical fiber panel according to claim 10, It is characterized in that It is prepared according to the preparation method according to any one of claims 1 to 9.

12. Application of the optical fiber panel according to claim 10 or 11 in the fields of national defense, aerospace, and civil electronic technology.

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