Triangular filament and preparation method and application thereof

Abstract

The invention provides a triangular filament and a preparation method and application thereof. The method comprises the following steps: processing a glass rod into a hexagonal rod with a regular hexagonal radial section, and drawing the hexagonal rod into a hexagonal wire; the hexagonal wires are placed in a mold with the triangular radial section to be arranged in a stacked mode, the side faces of all the hexagonal wires abut against each other to form close packing, rod bundling is conducted, and a triangular multifilament rod with the triangular radial section is obtained; and drawing the triangular multifilament rod to obtain the triangular filament. The technical problem to be solved by the invention is how to prepare a special-shaped wire with a triangular structure and apply the special-shaped wire to a preparation process of a micro-channel plate with a special-shaped reaming structure in which a hexagonal taper hole and an inner cylinder are combined, so that the obtained micro-channel plate is high in opening ratio, and point discharge is not caused when the micro-channel plate is used in a high-field-intensity application scene; and abnormal increase of dark current cannot be caused, so that the method is more practical.

Description

Technical Field

[0001] The invention relates to the technical field of microchannel plate manufacturing, in particular to a triangular wire and a preparation method and application thereof. Background Art

[0002] Microchannel plate (MCP), as a highly specialized glass-based functional material, has shown extraordinary application potential in many high-tech fields with its unique structural characteristics. The opening ratio of the microchannel plate is a key indicator to measure the performance of MCP. How to improve the opening ratio of the channel to enhance its detection efficiency while ensuring the structural strength is a technical problem faced by this field.

[0003] In the prior art, the channel opening of the input surface of the microchannel plate is processed into a funnel shape to achieve an opening ratio of 70% or even 90%. However, when the opening ratio reaches 90% by expanding the end surface of the microchannel plate, it is bound to form a flared tip at the expanded end surface of the microchannel plate. This flared tip is very likely to cause tip discharge when used in high-field strength application scenarios, causing damage to the microchannel plate or even the instrument; for this reason, the applicant team proposed patent CN202311656564.6, which adopts a special-shaped expansion structure combining a hexagonal cone hole and an inner cylinder at the input end surface of the MCP, and replaces the traditional hexagonal arrangement of circular channels with a hexagonal close-packed arrangement, which can increase the opening ratio to more than 91%. On the top; the hexagonal close-packed arrangement is to nest the first leather tube, the second leather tube and the third leather tube in sequence outside the circular core rod. The first leather tube is circular inside and hexagonal outside, and the second and third leather tubes are hexagonal inside and outside. The three leather tubes have different etching properties, and the etching rate decreases from the inside to the outside. When preparing MCP, the core rod is first removed by etching the blank, and then the end face of the MCP is expanded and etched. At the expanded end face of each channel, the first leather is completely etched away, the second leather is partially etched away, and the inner and outer edges of the third leather are hexagonal, forming a honeycomb structure. However, when the first leather is etched away, triangular residues that are difficult to completely remove will be left in the vertex end areas of the six edges of the hexagon outside the first leather tube, and these residues may cause adverse consequences such as abnormal increase in dark current. Summary of the invention

[0004] The main purpose of the present invention is to provide a triangular wire and a preparation method and application thereof. The technical problem to be solved is how to prepare a triangular-structured special-shaped wire and apply it to the preparation process of a microchannel plate with a special-shaped expanded hole structure combining a hexagonal cone hole and an inner cylinder, so as to overcome the performance bottleneck caused by the residual corners in the hexagonal expansion etching process, and improve the application stability and efficiency of the microchannel plate in key fields such as image intensifiers, ion detectors and detection instruments; the microchannel plate prepared by the present invention has a high opening ratio, and will not cause tip discharge when used in high-field strength application scenarios, and will not cause abnormal increase in dark current, so 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 triangular wire proposed by the present invention, the method comprises the following steps:

[0006] S11 processes the glass rod into a hexagonal rod having a regular hexagonal radial cross section, and then draws the rod into a hexagonal wire;

[0007] S12: placing the hexagonal wires in a mold with a triangular radial cross section, arranging them in layers, so that the sides of each hexagonal wire abut against each other to form a dense stack, and bundling the wires to obtain a triangular multifilament rod with a triangular radial cross section;

[0008] S13 draws the triangular multifilament rod to obtain triangular wire.

[0009] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0010] Preferably, in the aforementioned preparation method, the mold comprises:

[0011] A plurality of triangular rod brackets, each triangular rod bracket comprising a bracket body; a groove penetrating the front end and the rear end of the bracket body is provided at the upper end of the bracket body; the shape of the groove in the longitudinal section parallel to the front end and the rear end is an isosceles triangle; the vertex angle of the isosceles triangle is provided at the bottom end of the groove; a plurality of triangular rod brackets are arranged in parallel, and the grooves on each triangular rod bracket are aligned with each other to form the main body of the triangular rod mold;

[0012] The fixing block is arranged above a triangular rod bracket close to one side among the plurality of triangular rod brackets; the bottom surface of the fixing block is a plane; the bottom surface of the fixing block abuts against the side surface of the groove of the triangular rod bracket to form an isosceles triangle through hole.

[0013] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions: A triangular wire proposed in the present invention is prepared according to the above-mentioned triangular wire preparation method.

[0014] 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 a spliced ​​leather tube proposed in the present invention, the method comprises the following steps:

[0015] S41: grinding six side edges of the raw material leather tube to form a plane; the inner contour line of the radial cross section of the raw material leather tube is a circle, and the outer contour line is a regular hexagon;

[0016] S42 arranges the aforementioned triangular wire at the plane so that one side of the triangular wire is connected to the plane to form a spliced ​​leather tube; the radial cross-section of the triangular wire is an isosceles triangle with a vertex angle of 120°; the side connected to the plane is the side corresponding to the base of the isosceles triangle; the inner contour line of the spliced ​​leather tube is a circle, and the outer contour line is a hexagon.

[0017] Preferably, in the aforementioned preparation method, the material of the triangular wire described in step S42 is a glass material that can be removed by acid etching, and its etching rate is greater than the etching rate of the raw material tube glass.

[0018] Preferably, in the aforementioned preparation method, the steps for preparing the triangular wire in step S42 are as follows:

[0019] S61 processes the glass rod into a hexagonal rod with a regular hexagonal radial cross section, and then draws the rod into a hexagonal wire;

[0020] S62: placing the hexagonal wires in a mold whose radial cross section is an isosceles triangle with a vertex angle of 120°, and stacking them in n layers, so that the sides of each of the hexagonal wires are closely packed, and then bundling the wires to obtain a triangular multifilament rod whose radial cross section is an isosceles triangle with a vertex angle of 120°; the 120° vertex angle of the mold is set downward; n is a natural number ≥ 2;

[0021] S63 draws the triangular multifilament rod to obtain triangular wire.

[0022] Preferably, in the aforementioned preparation method, the target height of the triangular multifilament rod in step S62 is h; and the calculation formula of the opposite side distance x of the hexagonal wire in step S61 is as follows:

[0023]

[0024] 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 a microchannel plate proposed by the present invention, the method comprises the following steps:

[0025] S81 The third leather material tube, the second leather material tube and the first leather material tube are nested in sequence from the outside to the inside to form a leather material composite sleeve; the leather material composite sleeve is nested with a core material rod to form a composite glass rod; the core material rod is cylindrical, the first leather material tube is in the shape of an inner circle and an outer hexagon, the second leather material tube is in the shape of an inner and outer hexagon, and the third leather material tube is in the shape of an inner and outer hexagon; the first leather material glass, the second leather material glass and the third leather material glass have preset etching properties, and the etching rate of the first leather material glass ≥ the etching rate of the second leather material glass > the etching rate of the third leather material glass; the first leather material tube is a spliced ​​leather material tube prepared according to the aforementioned preparation method; the glass of the triangular wire is of the same material as the core material rod;

[0026] S82: the composite glass rod is made into a blank plate, and the core glass and triangular wire glass in the blank plate are removed by etching to obtain a microchannel blank plate with circular channels and triangular channels;

[0027] S83: performing expansion and etching on the first end face of the microchannel slab blank; at the expansion end face of each channel, the first skin glass is completely etched away, the second skin glass is partially etched away, and the inner and outer edges of the third skin glass are hexagonal to form a honeycomb structure, so that the expansion end face of the channel is a hexagonal cone hole, thereby obtaining an expanded microchannel slab blank;

[0028] S84: manufacturing the expanded microchannel plate blank into a microchannel plate.

[0029] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions: A microchannel plate proposed in the present invention is prepared according to the above-mentioned preparation method.

[0030] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions: According to the present invention, a microchannel plate according to the above is used in an image intensifier, an ion detector or a detection instrument.

[0031] By means of the above technical solution, the triangular wire and its preparation method and application proposed by the present invention have at least the following advantages:

[0032] The applicant has found that the problems described in the background art can be solved by finely grinding the sharp edges of the hexagonal leather tube into smooth bevels of a certain width and then filling these gaps with a glass material that can be removed by acid etching in the form of triangular wires. However, according to the applicant's usual specifications of the microchannel plate preparation process, in order to completely remove the triangular residues in the top corner area of ​​the leather tube, at least the sharp edges of the hexagonal leather tube should be finely polished into a smooth inclined surface with a width of 2.4 mm. The ideal filling triangular wire should be an isosceles triangle with a base of 2.4 mm and a top angle of 120°. However, due to the conventional diameter of the glass material round rod that can be removed by acid etching (about 35 mm), it is necessary to prepare a triangular wire with a height of 10 mm after proportional enlargement, which is extremely difficult in actual operation. Even if a round rod with a diameter of up to 120 mm is used, the processing difficulty and cost cannot be ignored. At the same time, the furnace diameter of current equipment is generally limited to about 55 mm, which cannot accommodate triangular wires with a height of more than 12 mm. Redesigning the furnace and producing large-diameter glass rods is not only costly and time-consuming, but also causes huge material loss.

[0033] To this end, the present invention proposes a triangular wire and a preparation method and application thereof, which adopts a mold with a specific structure of a triangle in radial cross section, and forms a densely packed arrangement by abutting the sides of the hexagonal wires against each other, so that the hexagonal wires are stacked into a tightly meshed multifilament rod. This structure prevents any displacement of the hexagonal wires during the subsequent rod bundling operation, and the multifilament rods after bundling can still maintain their original structure formed in the triangular mold, so that they can be drawn into triangular wires with controlled radial cross section. The preparation of triangular wires, especially the preparation of isosceles triangular filaments with a vertex angle of 120°, through the technical solution of the present invention not only solves the difficult problems in the design of specific microchannel plates and simplifies the production process, but also has a high degree of flexibility and scalability, providing new ideas for the design and production of various other special-shaped wires in the future.

[0034] Furthermore, the present invention applies the above-mentioned triangular wire to prepare a spliced ​​leather material tube, so that the above-mentioned triangular wire is set at the position of each vertex angle on the outside of the leather material tube, and by controlling the material of the triangular wire to be the same as the material of the core rod to be configured for the spliced ​​leather material tube, the triangular wire on the outside of the leather material tube is completely removed when the core rod is subsequently removed, so that in the subsequent microchannel plate preparation process, a microchannel plate blank with circular channels and triangular channels can be obtained in the etching step S82, which overcomes the problem recorded in the background technology in the preparation of a microchannel plate with hexagonal cone holes. The technical problems existing in the process of preparing a high-opening ratio microchannel plate with a hexagonal close-packed arrangement of a special-shaped expanded hole structure combined with an inner cylinder are solved, so that the first skin material can be completely removed from the blank plate when the first skin material is removed by etching, including some materials in the outer top corner area of ​​the first skin material tube that are difficult to be etched and removed can also be completely removed, so that the opening ratio of the prepared microchannel plate is as high as 91% or more. When used in high-field strength application scenarios, it will not cause tip discharge, and will not cause abnormal increase in dark current, further improving the performance of the high-opening ratio microchannel plate.

[0035] From the above, it can be seen that the core purpose of the present invention is to overcome the performance bottleneck caused by the residual corners in the hexagonal expansion etching process, and to improve the application stability and efficiency of the microchannel plate in key fields such as image intensifiers, ion detectors and detection instruments; at the same time, the present invention not only focuses on solving specific problems, but also aims to open up new paths for the design and preparation of special-shaped wires, provide innovative inspiration for related fields, and encourage the exploration of more diversified solutions from the perspective of non-traditional raw material shapes to cope with various special-shaped wire preparation challenges that may be encountered in the future.

[0036] 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 preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1It is a schematic diagram of the layout of the top angle wires in the triangular mold of the present invention;

[0038] Figure 2 This is a schematic diagram of a triangular rod arrangement of the present invention;

[0039] Figure 3a This is the triangular rod mold design drawing of the present invention - the upper and lower isometric drawings;

[0040] Figure 3b This is the design diagram of the triangular rod mold of the present invention - front view;

[0041] Figure 3c This is the design drawing of the triangular rod mold of the present invention - top view;

[0042] Figure 3d This is the design drawing of the triangular rod mold of the present invention - bottom view;

[0043] Figure 4a This is the design drawing of the triangular rod bracket of the present invention - the upper and lower isometric drawing;

[0044] Figure 4b This is the design diagram of the triangular rod bracket of the present invention - front view;

[0045] Figure 5 It is the triangular rod hexagonal hanging rod head of the present invention;

[0046] Figure 6a is a schematic diagram of a spliced ​​leather material tube after six vertex angles are flattened in a specific embodiment of the present invention;

[0047] Figure 6b yes Figure 6a Schematic diagram of radial section;

[0048] Figure 7 This is a microscopic magnified photograph of a microchannel blank with circular channels and triangular channels obtained after the blank is etched to remove the core glass and the triangular wire glass in a specific embodiment of the present invention;

[0049] Figure 8 It is a dark current measurement data diagram of the microchannel plates prepared in the embodiments of the present invention and the comparative examples. DETAILED DESCRIPTION

[0050] 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 triangular wire and its preparation method and its specific implementation method, structure, characteristics and effects proposed by 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.

[0051] The present invention provides a method for preparing a triangular wire, which comprises the following steps:

[0052] S11 processes the glass rod into a hexagonal rod with a regular hexagonal radial cross section, and then draws the hexagonal wire. The hexagonal rod in this step can be prepared by conventional processing methods in the art, and the present invention does not make specific limitations on this. For example, the glass rod can be carefully polished into the hexagonal rod. The hexagonal wire can be drawn by conventional processing methods in the art, and the present invention does not make specific limitations on this.

[0053] S12 places the hexagonal wires in a mold with a triangular radial cross-section and arranges them in layers, so that the sides of each hexagonal wire abut against each other to form a dense stacking, and bundles them into a rod to obtain a triangular multifilament rod with a triangular radial cross-section; this step is the key to the present invention, by adopting a mold with a specific structure with a triangular radial cross-section, the hexagonal wires abut against each other's sides to form a dense stacking arrangement, so that the hexagonal wires are stacked into a multifilament rod with a tightly fitted meshing arrangement. This structure effectively avoids the sliding problem caused by gaps when the round wires are arranged, especially when performing the bundling and fixing operation, the triangular rod with the hexagonal wires tightly arranged exhibits excellent stability and position retention ability, so that the hexagonal wires will not be displaced during the subsequent bundling operation, and the multifilament rod after bundling can still maintain its original structure formed in the triangular mold, so that it can be drawn into a triangular wire with a controlled radial cross-section.

[0054] S13 draws the triangular multifilament rod to obtain a triangular wire.

[0055] In order to meet the needs of different application scenarios, the head hanging rod part in this step adopts a modular design, which can be freely adjusted and modified according to the existing hanging rod head shape, as shown in the attached Figure 5 As shown, when only a hexagonal hanging rod head is available, a hexagonal rod head can be formed by cleverly arranging short wires at the front end of the triangular rod to achieve compatibility with different hanging rod heads, thereby enhancing the compatibility with the hanging rod heads, improving the flexibility and practicality of the overall structure, and broadening the scope of application and practicality of the present invention.

[0056] In order to enable the hexagonal wires to adjust their positions by themselves with the help of gravity when they are arranged, so that the dense packing effect is more guaranteed, the present invention preferably designs the above-mentioned triangular mold to be a mold with an isosceles triangle cross-section with the vertex angle downward. In a specific embodiment of the present invention, as shown in the attached Figure 2 , Attachment Figure 3a to 3d and attached Figure 4a-4bAs shown, the triangular rod mold includes a plurality of triangular rod brackets and a fixing block. Specifically, each triangular rod bracket includes a bracket body; a groove with a triangular radial section that passes through the front and rear ends of the bracket body is provided at the upper end of the bracket body; the shape of the groove in the longitudinal section parallel to the front and rear ends is an isosceles triangle, that is, the longitudinal section is perpendicular to the three edges of the triangle; the vertex angle of the isosceles triangle is provided at the bottom end of the groove, so that when the hexagonal wires are stacked, they can be closely stacked to form a meshing structure by the action of gravity; a plurality of triangular rod brackets are arranged in parallel, and the grooves on each triangular rod bracket are aligned with each other to form the main body of the triangular rod mold; in a specific embodiment of the present invention, 3 to 4 auxiliary inverted triangle brackets are provided at the same time, and when the hexagonal wires are arranged, each multifilament crosses several triangular rod brackets at the same time to ensure that the tail wire can also be stably fixed, thereby improving the firmness of the overall structure. The fixing block is arranged above a triangular rod bracket close to one side among several triangular rod brackets, and the bottom surface of the fixing block is a plane; the bottom surface of the fixing block abuts against the side surface of the groove of the triangular rod bracket to form an isosceles triangle through hole; the fixing block is used to fix and clamp the arranged hexagonal wires, so as to bundle and tie them to ensure that they can still maintain the densely packed meshing structure of the hexagonal wires after being bundled, so that they can still burst out a controlled triangular wire structure after being drawn.

[0057] The size, angle, etc. of the isosceles triangle mold and its supporting components used in the above preparation process can be customized as needed to meet diverse production needs.

[0058] The present invention also provides a triangular wire, which is prepared according to the above-mentioned triangular wire preparation method. The triangular wire is designed to be used in the preparation process of a microchannel plate with a specific structure. The specific description is as follows:

[0059] The present invention provides a method for preparing a spliced ​​leather tube, which comprises the following steps:

[0060] S41 grinds the six side edges of the raw material leather tube to form a flat surface. The structure after grinding is as shown in the attached figure. Figure 6a and attached Figure 6b As shown; the inner contour line of the radial cross section of the raw material leather tube is a circle, and the outer contour line is a regular hexagon.

[0061] S42 The aforementioned triangular wire is arranged at the plane, so that one side of the triangular wire is connected to the plane obtained by grinding to form a spliced ​​leather tube; the connection here can be welding after bundling or tying with rods, or it can be welding after the ends of the wire are bonded with glue, and the present invention does not make specific limitations on this; the radial cross-section of the triangular wire is an isosceles triangle with a vertex angle of 120°; the side connected to the plane is the side corresponding to the base of the isosceles triangle; the inner contour line of the spliced ​​leather tube is a circle, and the outer contour line is a hexagon.

[0062] In the above technical scheme, in order to enable the triangular wire to be etched and removed together with the core rod during the core rod etching process, the material of the triangular wire described in step S42 of the present invention is preferably a glass material that can be removed by acid etching, and its etching rate is greater than the etching rate of the raw material tube glass; it is further preferred that the material of the triangular wire glass is consistent with the material of the core rod glass.

[0063] In the above technical solution, the steps of preparing the triangular wire in step S42 are as follows:

[0064] S61 processes the glass rod into a hexagonal rod with a regular hexagonal radial cross section, and then draws it into a hexagonal wire.

[0065] S62 places the hexagonal wire in a mold whose radial cross section is an isosceles triangle with a vertex angle of 120°, and arranges n layers of the hexagonal wire in a stacked manner so that the sides of each hexagonal wire abut against each other to form a dense stack, and bundles the wires to obtain a triangular multifilament rod whose radial cross section is an isosceles triangle with a vertex angle of 120°; the 120° vertex angle of the mold is set downward; n is a natural number ≥2.

[0066] S63 draws the triangular multifilament rod to obtain a triangular wire.

[0067] In the above technical scheme, the precise control of the diameter of the hexagonal wire (distance between opposite sides) is conducive to enabling the triangular multifilament rods to be tightly stuck in the through holes surrounded by the mold bracket and the fixed block after arrangement, so that the hexagonal wires in the triangular multifilament rods can fit tightly during subsequent bundling and rod tying operations, and will not shake and cause them to be misplaced or scattered, so that they can better maintain the original triangular state after arrangement, thereby controlling the shape and size of the triangular wires.

[0068] In order to precisely control the wire diameter of the hexagonal wire, the present invention preferably sets the target height of the triangular multifilament rod in step S62 to h; the calculation formula of the opposite side distance x of the hexagonal wire in step S61 is as follows:

[0069]

[0070] The calculation process is described in detail below: Assume that the height of the isosceles triangle die with a vertex angle of 120°, that is, the target height of the triangular multifilament rod is h, the wire diameter of the hexagonal wire to be drawn is x, and the number of layers of hexagonal wire in the die is n. The layout of the hexagonal wire placed at the vertex of the die is as shown in the attached figure. Figure 1 As shown, using the Pythagorean theorem, we can calculate that the length of a single side of the hexagonal wire is approximately Then the vertical distance from the bottom edge of the wire at the vertex angle to the vertex angle is deduced as:

[0071]

[0072] Combining the above relationships, we construct the following equation:

[0073]

[0074] By solving this equation, we can obtain the calculation formula for the wire diameter (distance between opposite sides) x of the above-mentioned hexagonal wire.

[0075] The formula for calculating the wire diameter of the hexagonal wire can be flexibly adjusted according to the shape and size of the triangular wire according to the above calculation process, and the present invention does not list them one by one.

[0076] The present invention also provides a method for preparing a microchannel plate using the above-mentioned spliced ​​leather tube, which comprises the following steps:

[0077] S81 The third leather tube, the second leather tube and the first leather tube are nested in sequence from the outside to the inside to form a leather composite sleeve; the leather composite sleeve is nested with a core rod to form a composite glass rod; the core rod is cylindrical, the first leather tube is in the shape of an inner circle and an outer hexagon, the second leather tube is in the shape of inner and outer hexagons, and the third leather tube is in the shape of inner and outer hexagons; the first leather glass, the second leather glass and the third leather glass have preset etching properties, the etching rate of the first leather glass ≥ the etching rate of the second leather glass > the etching rate of the third leather glass; the first leather tube is a spliced ​​leather tube prepared according to the aforementioned preparation method; the glass of the triangular wire is of the same material as the core rod.

[0078] S82 The composite glass rod is made into a blank plate, and the core glass and triangular wire glass in the blank plate are removed by etching to obtain a microchannel blank plate with circular channels and triangular channels, as shown in the attached Figure 7 shown.

[0079] S83: Expanding and etching the first end face of the microchannel slab blank. At the expanded end face of each channel, the first skin glass is completely etched away, the second skin glass is partially etched away, and the inner and outer edges of the third skin glass are hexagonal to form a honeycomb structure, so that the expanded end face of the channel is a hexagonal cone hole, thereby obtaining an expanded microchannel slab blank.

[0080] S84 forms the expanded microchannel plate blank into a microchannel plate.

[0081] The present invention also proposes a microchannel plate, which is prepared according to the above-mentioned preparation method. The present invention uses the above-mentioned technical solution to prepare an isosceles triangle structure with a triangular wire having a vertex angle of 120°, and uses a unique design to make a blank plate, and then acid-etches to remove the triangular wire, which can effectively solve the performance problem caused by the six corners remaining after etching of a traditional hexagonal cone hole microchannel plate.

[0082] Furthermore, the preparation of the triangular wire in the present invention is further processed from a triangular multifilament rod made of precisely arranged hexagonal wires, thereby achieving precise control from the basic material to the final product.

[0083] The present invention also proposes an application of the aforementioned microchannel plate in an image intensifier, an ion detector or a detection instrument.

[0084] The present invention also provides a triangular rod mold, which comprises:

[0085] A plurality of triangular rod brackets, each triangular rod bracket comprising a bracket body; a groove penetrating the front end and the rear end of the bracket body is provided at the upper end of the bracket body; the shape of the groove in the longitudinal section perpendicular to the front end and the rear end is an isosceles triangle; the vertex angle of the isosceles triangle is provided at the bottom end of the groove; a plurality of triangular rod brackets are arranged in parallel, and the grooves on each triangular rod bracket are aligned with each other to form the main body of the triangular rod mold;

[0086] The fixing block is arranged above a triangular rod bracket close to one side among the plurality of triangular rod brackets; the bottom surface of the fixing block is a plane; the bottom surface of the fixing block abuts against the side surface of the groove of the triangular rod bracket to form an isosceles triangle through hole.

[0087] 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.

[0088] Example

[0089] In this embodiment, a triangular wire is prepared, and a spliced ​​leather tube is prepared using the triangular wire, and a microchannel plate is further prepared. The specific steps are as follows:

[0090] 1) Prepare a triangular rod mold according to the size design: In this embodiment, the radial cross section of the triangular rod mold is an isosceles triangle with a vertex angle of 120°, and the height h of the groove in the mold is 9 mm; Figure 2 As shown, the triangular bar mold includes five triangular bar brackets arranged in parallel, and the grooves on each triangular bar bracket are aligned with each other to form the main body of the triangular bar mold; the triangular bar bracket at the end is equipped with a fixing block.

[0091] 2) Prepare hexagonal wire according to size: the hexagonal rod material uses the same glass as the core rod glass of the microchannel plate; the hexagonal rod is drawn into a hexagonal wire with a distance of 0.524 mm across the edges.

[0092] 3) Arrange the hexagonal wire in the triangular rod mold: as shown in the attached Figure 1 As shown, the first hexagonal wire is symmetrically placed in the middle of the top corner of the mold, and then the hexagonal wires are stacked layer by layer in a side-to-side abutment manner; a total of 17 layers are stacked and bundled.

[0093] 4) The triangular multifilament rod is drawn into triangular wire: as shown in the attached Figure 5 As shown, short wires are arranged at the front end of the side surface of the bottom side of the triangular rod to form a hexagonal rod head, which is then drawn into a triangular wire in cooperation with the hexagonal hanging rod head.

[0094] 5) Preparation of the spliced ​​leather tube: Prepare the first leather tube according to the size, the inner contour line of the radial cross section of which is a circle and the outer contour line is a regular hexagon; grind the six outer edges of the first leather tube to form a smooth plane with a width of 2.4 mm, as shown in the attached Figure 6b As shown; the above-mentioned drawn triangular wires are bundled and tied into rods in the form of butt joint between the bottom side and the polished surface to form a spliced ​​leather tube.

[0095] 6) Microchannel plate preparation:

[0096] A. According to the size design, prepare the second leather tube with inner and outer hexagonal shapes and the third leather tube with inner and outer hexagonal shapes, as well as the cylindrical core rod. From the outside to the inside, the third leather tube, the second leather tube and the spliced ​​leather tube are nested in sequence to form a leather composite sleeve; the leather composite sleeve is nested with the core rod to form a composite glass rod; wherein the etching rate of the first leather glass is ≥ the etching rate of the second leather glass> the etching rate of the third leather glass; and the leather glass is resistant to acid corrosion, while the core glass is easily corroded by acid.

[0097] B. The composite glass rod is drawn into single-filament and multi-filament, and the multi-filament is arranged in specifications and melted into blank sections; then the blank plate is obtained by slicing, chamfering, grinding and polishing, and the core glass in the blank plate and the triangular wire on the outside of the spliced ​​leather tube are removed by acid corrosion to form multiple through-going circular microporous channels and triangular holes, as shown in the attached figure. Figure 7 As shown, the composite skin glass is retained to form the composite channel wall, and thus the blank plate becomes a microchannel plate blank plate.

[0098] C. The first end face of the microchannel slab is expanded and etched. At each expanded end face, the first skin glass is completely etched away, the second skin glass is partially etched away, and the inner and outer edges of the third skin glass are hexagonal to form a honeycomb structure, so that the expanded end face of the aforementioned channel is a hexagonal cone hole, thereby obtaining an expanded microchannel slab.

[0099] D. After the expanded blank of the microchannel plate is plated with a metal electrode, a material with a high secondary electron emission coefficient is deposited on the expanded end face to cover the end face of the third glass. The end face coincides with the entrance end face of the hexagonal pyramidal hole formed after etching the first glass and the second glass, and a part of the hexagonal pyramidal surface is in the first glass and the second glass, thereby obtaining a microchannel plate.

[0100] Ten microchannel plates prepared by the method of this embodiment at different time periods were taken to measure the dark current of the microchannel plates. The test data are shown in Table 1.

[0101] Table 1

[0102]

[0103]

[0104] Comparative Example

[0105] The same as Example 1, except that the first leather material tube is not treated with a spliced ​​triangle wire, and the first leather material tube is directly used to replace the spliced ​​leather tube for preparing the microchannel plate.

[0106] The detection method is the same as in Example 1, and the test data is shown in Table 2.

[0107] Table 2

[0108]

[0109] In order to more intuitively understand the dark current level of the microchannel plate, the present invention plots the dark current measurement values ​​of the microchannel plates prepared in the above embodiments and comparative examples in a bar graph, as shown in the attached figure. Figure 8 As shown in the figure, the dark current test data shows that the dark current of the microchannel plate prepared in the embodiment of the present invention is extremely low, and the maximum dark current of the 10 samples is as low as 0.00573pA / cm 2 The dark current of the microchannel plate prepared by the prior art is higher. For example, the minimum dark current of the comparative example is as high as 0.382pA / cm 2 ; After a simple conversion, it can be seen that the technical solution of the present invention can reduce the dark current by 6.7 to 40 times; Figure 8 It can also be intuitively shown that the lowest dark current of the comparative example is much larger than the highest dark current of the embodiment.

[0110] 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.

[0111] 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 triangular wire, characterized in that: It includes the following steps: S11 processes the glass rod into a hexagonal rod having a regular hexagonal radial cross section, and then draws the rod into a hexagonal wire; S12: placing the hexagonal wires in a mold with a triangular radial cross section, arranging them in layers, so that the sides of each hexagonal wire abut against each other to form a dense stack, and bundling the wires to obtain a triangular multifilament rod with a triangular radial cross section; S13 draws the triangular multifilament rod to obtain triangular wire.

2. The preparation method according to claim 1, characterized in that: The mold comprises: A plurality of triangular rod brackets, each triangular rod bracket comprising a bracket body; a groove penetrating the front end and the rear end of the bracket body is provided at the upper end of the bracket body; the shape of the groove in the longitudinal section parallel to the front end and the rear end is an isosceles triangle; the vertex angle of the isosceles triangle is provided at the bottom end of the groove; a plurality of triangular rod brackets are arranged in parallel, and the grooves on each triangular rod bracket are aligned with each other to form the main body of the triangular rod mold; The fixing block is arranged above a triangular rod bracket close to one side among the plurality of triangular rod brackets; the bottom surface of the fixing block is a plane; the bottom surface of the fixing block abuts against the side surface of the groove of the triangular rod bracket to form an isosceles triangle through hole.

3. A triangular wire, characterized in that: The triangular wire is prepared according to the method for preparing the triangular wire according to claim 1 or 2.

4. A method for preparing a spliced ​​leather tube, characterized in that: It includes the following steps: S41: grinding six side edges of the raw material leather tube to form a plane; the inner contour line of the radial cross section of the raw material leather tube is a circle, and the outer contour line is a regular hexagon; S42 The triangular wire described in claim 3 is arranged at the plane, so that one side of the triangular wire is connected to the plane to form a spliced ​​leather tube; the radial cross-section of the triangular wire is an isosceles triangle with a vertex angle of 120°; the side connected to the plane is the side corresponding to the base of the isosceles triangle; the inner contour line of the spliced ​​leather tube is a circle, and the outer contour line is a hexagon.

5. The preparation method according to claim 4, characterized in that: The material of the triangular wire described in step S42 is a glass material that can be removed by acid etching, and its etching rate is greater than the etching rate of the raw material leather tube glass.

6. The preparation method according to claim 4, characterized in that: The steps for preparing the triangular wire in step S42 are as follows: S61 processes the glass rod into a hexagonal rod with a regular hexagonal radial cross section, and then draws the rod into a hexagonal wire; S62: placing the hexagonal wires in a mold whose radial cross section is an isosceles triangle with a vertex angle of 120°, and stacking them in n layers, so that the sides of each of the hexagonal wires are closely packed, and then bundling the wires to obtain a triangular multifilament rod whose radial cross section is an isosceles triangle with a vertex angle of 120°; the 120° vertex angle of the mold is set downward; n is a natural number ≥ 2; S63 draws the triangular multifilament rod to obtain triangular wire.

7. The preparation method according to claim 6, characterized in that: The target height of the triangular multifilament rod in step S62 is h; the calculation formula of the opposite side distance x of the hexagonal wire in step S61 is as follows:

8. A method for preparing a microchannel plate, characterized in that: The following steps are involved: S81 The third leather material tube, the second leather material tube and the first leather material tube are nested in sequence from the outside to the inside to form a leather composite sleeve; the leather composite sleeve is nested with a core material rod to form a composite glass rod; the core material rod is cylindrical, the first leather material tube is in the shape of an inner circle and an outer hexagon, the second leather material tube is in the shape of an inner and outer hexagon, and the third leather material tube is in the shape of an inner and outer hexagon; the first leather glass, the second leather glass and the third leather glass have preset etching properties, and the etching rate of the first leather glass ≥ the etching rate of the second leather glass > the etching rate of the third leather glass; the first leather material tube is a spliced ​​leather material tube prepared according to the preparation method according to any one of claims 4 to 7; the glass of the triangular wire is of the same material as the core material rod; S82: the composite glass rod is made into a blank plate, and the core glass and triangular wire glass in the blank plate are removed by etching to obtain a microchannel blank plate with circular channels and triangular channels; S83: performing expansion and etching on the first end face of the microchannel slab blank; at the expansion end face of each channel, the first skin glass is completely etched away, the second skin glass is partially etched away, and the inner and outer edges of the third skin glass are hexagonal to form a honeycomb structure, so that the expansion end face of the channel is a hexagonal cone hole, thereby obtaining an expanded microchannel slab blank; S84: manufacturing the expanded microchannel plate blank into a microchannel plate.

9. A microchannel plate, characterized in that: It is prepared according to the preparation method according to claim 8.

10. Use of the microchannel plate according to claim 9 in an image intensifier, an ion detector or a detection instrument.

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