Thin outer layer polymer derived ceramic solidified basalt fiber wrapped nickel-plated copper flat wire and preparation method thereof

Abstract

The invention belongs to the technical field of lapped wires, and particularly relates to a thin outer-layer polymer derived ceramic solidified basalt fiber lapped nickel-plated copper flat wire and a preparation method thereof.A basalt fiber mica tape is used as a main insulating material and lapped on the surface of a nickel-plated copper flat wire, then the surface of the basalt fiber mica tape is impregnated with high-temperature-resistant glue, and the thin outer-layer polymer derived ceramic solidified basalt fiber lapped nickel-plated copper flat wire is obtained. And baking at high temperature to obtain the high-temperature-resistant mica lapped wire. The problem that an existing enameled wire is not high in high temperature resistance is solved, polysilazane can completely permeate into the basalt fiber mica tape by means of permeability and fluidity of polysilazane, and a wrapping structure of a ceramic shell wrapping structure is formed; due to high insulation resistance and voltage resistance, the lapped flat wire can still keep a stable working state in severe electrical environments such as high voltage and high frequency; the corona resistance is improved; the service life is prolonged; the tensile strength is enhanced; wear resistance is improved; the conductor is protected from being damaged; and harmful substances are not generated, so that the safe use of the lapped flat wire is ensured.

Description

Technical Field

[0002] The invention belongs to the technical field of wrapped wires, and in particular relates to a polymer-derived ceramic-cured wrapped flat wire and a preparation method thereof. Background Art

[0003] In the field of high-temperature winding wire, the highest heat resistance level specified by the national standard and IEC standard is level 200, which means that the material can work continuously for 20,000 hours at 200°C. However, further improving the heat resistance level faces technical challenges. The main reason is that carbon-based binders will undergo thermal aging at high temperatures, resulting in a decrease in insulation performance. At the same time, the external voltage will cause the organic molecular chains of the insulation layer to break, further weakening the electrical insulation performance.

[0004] In order to solve this problem, some businesses have launched mica wrapped wires with heat resistance of up to 500°C or even higher. These products usually use woven glass fiber filaments to wrap the mica layer to avoid the use of adhesives. However, this woven glass fiber layer is generally thicker and requires at least two layers of strands to be interlaced to achieve weaving, so the thickness of a single layer is usually between 0.2 and 0.6 mm. If glass fiber filaments are directly used for wrapping without adding adhesives, the fiber wrapping layer will be loose due to lack of restraint, causing the mica layer to fall off and fail to meet the use requirements.

[0005] For wrapped flat wire, it is extremely difficult to control the weaving structure due to the presence of parameters such as wide side, narrow side and R angle in its size structure, so it is impossible to use the weaving process to wrap the mica tape layer; and inorganic materials have potential advantages as insulating materials, but they are hard, brittle and have poor adhesion, and cannot meet the bending and deformation requirements of subsequent processing of the wrapped wire.

[0006] Although some researchers have tried to prepare silica wires by spraying inorganic materials on the surface of wires, the insulation layer of such wires is very thin and has weak resistance to electrical breakdown. Another type of inorganic insulated wire uses a conductive center wire and a thick outer layer of inorganic insulating powder, which is wrapped with a copper tube to prevent the powder from loosening. However, this product is also difficult to deform and is expensive.

[0007] In addition, copper will be oxidized by oxygen in the air when used for a long time at high temperature (such as 350°C), and the volume will expand after the copper oxide is generated, causing the mica tape and the outer protective fiber to bulge. Summary of the invention

[0008] In view of the deficiencies in the above-mentioned prior art, the object of the present invention is to provide a polymer-derived ceramic-cured wrapped rectangular wire and a preparation method thereof.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a polymer-derived ceramic cured wrapped flat wire, which includes a conductor and a basalt fiber mica tape wrapped around the outer layer of the conductor, and the basalt fiber mica tape is coated with at least one layer, and the thickness of a single layer of the basalt fiber mica tape is 0.05 to 0.3 mm.

[0010] As a preferred embodiment of the present invention, the conductor is a nickel-plated copper flat wire, and the length of the cross section of the flat wire is 0.2 to 10 mm, and the height is 1 to 20 mm.

[0011] As a preferred embodiment of the present invention, the basalt fiber mica tape is composited by connecting mica sheets and basalt fibers through organic polymer-derived ceramic materials, and the conductor is sequentially coated by the mica sheets and basalt fibers from the inside to the outside.

[0012] As a preferred embodiment of the present invention, the organic polymer-derived ceramic material is polysilazane or a polysilazane derivative with a viscosity of 1000 to 20000 cps.

[0013] As a preferred embodiment of the present invention, when the basalt fiber mica tape is provided in multiple layers, the basalt fiber mica tape is wound in a spiral shape in an interlaced manner, and the total thickness of the basalt fiber mica tape is 0.3-0.6 mm.

[0014] As a preferred embodiment of the present invention, the mass ratio of the basalt fiber to the organic polymer-derived ceramic material is 9 to 99:1.

[0015] As a preferred embodiment of the present invention, the mass ratio of the mica flakes to the basalt fibers is 7 to 57:3.

[0016] The invention also includes a method for preparing a nickel-plated copper flat wire wrapped with a thin outer layer of polymer-derived ceramic-cured basalt fiber, comprising the following steps: Step 1, using basalt fiber mica tape to wrap around the surface of the nickel-plated flat copper tape to form a wrapped flat copper tape; the basalt fiber mica tape has at least one layer; Step 2, dip-coating the wrapped flat copper strip with an organic polymer-derived ceramic material, and standing it at a constant temperature for 2 to 4 hours to obtain a prefabricated wrapped wire; the concentration of the organic polymer-derived ceramic material is 0.1 to 30%; the temperature of the constant temperature is 20 to 30° C., and the extrusion pressure of the standing is 0.1 to 5 MPa; Step 3, baking and curing the prefabricated wrapped wire to obtain a polymer-derived ceramic cured wrapped flat wire, wherein the baking and curing is performed by static baking and curing or in a line manner, and the baking and curing temperature is 400-600°C.

[0017] As another preferred embodiment of the present invention, the nickel-plated flat copper strip is rolled, drawn or extruded to prepare the copper flat wire, and the surface of the copper flat wire is completely covered with a pure nickel layer or a nickel alloy layer with a thickness of 1 to 200 μm by electroplating or spraying.

[0018] As another preferred embodiment of the present invention, the basalt fiber mica tape is obtained by coating the surface of basalt fiber with an organic polymer-derived ceramic material and then covering it with a mica sheet, and then baking it at a high temperature, wherein the baking temperature is 150 to 400°C.

[0019] Compared with the prior art, the present invention has the following beneficial effects: Improve electrical performance and enhance insulation performance: Basalt fiber mica tape has excellent insulation performance, which can effectively isolate current and prevent electrical short circuit and leakage. Its high insulation resistance and voltage resistance make the wrapped flat wire maintain stable working state in harsh electrical environments such as high voltage and high frequency;

[0020] Improve corona resistance: Basalt fiber mica tape has good corona resistance, which can resist the erosion of corona discharge on the wrapped flat wire and extend its service life; Enhanced tensile strength: Basalt fiber has the characteristics of high modulus and high strength, which enables the wrapped flat wire to withstand greater tension when subjected to external force and is not easy to break; Improve wear resistance: Basalt fiber mica tape has excellent wear resistance, can effectively resist mechanical wear and scratches, and protect the conductor from damage; Improve high temperature resistance: Basalt fiber mica tape has good high temperature resistance, can maintain stable physical and chemical properties in high temperature environment, does not produce harmful substances, and ensures the safe use of wrapped flat wire; Improved thermal stability: The polymer-derived ceramic curing technology enables the wrapped flat wire to maintain a stable structure at high temperatures, making it less likely to deform or melt, thus improving its thermal stability; Resistant to chemical corrosion: Basalt fiber mica tape has good corrosion resistance to a variety of chemical substances, and can resist the erosion of corrosive substances such as acid, alkali, and salt, thus extending the service life of the wrapped flat wire; Lightweight design: Basalt fiber mica tape has a lower density, which enables the wrapped flat wire to achieve lightweight design while ensuring performance, reducing overall weight and improving energy efficiency. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0023] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0024] However, the protection scope of the present invention is not limited to the following.

[0025] The existing basalt fiber covered wire is a high-performance, multifunctional material, and this application is mainly used in the application of outdoor small and medium-sized external cables.

[0026] Example 1 A polymer-derived ceramic-cured wrapped flat wire comprises a conductor and a basalt fiber mica tape wrapped around the outer layer of the conductor, wherein the basalt fiber mica tape is coated with at least one layer, and the thickness of a single layer of the basalt fiber mica tape is 0.05 mm.

[0027] The conductor is a nickel-plated copper flat wire, the length of the flat wire cross section is 0.2 mm, and the height is 1 mm; the thickness of the nickel-plated layer is 80±20 microns.

[0028] The basalt fiber mica tape is formed by connecting and compounding mica sheets and basalt fibers through organic polymer-derived ceramic materials, and the conductor is coated by the mica sheets and basalt fibers in sequence from the inside to the outside.

[0029] The organic polymer derived ceramic material is polysilazane or a polysilazane derivative (polysilazane is preferred in this embodiment) with a viscosity of 20,000 cps.

[0030] The mass ratio of the basalt fiber to the organic polymer derived ceramic material is 9:1.

[0031] The basalt fiber mica tape is composited with basalt fiber and mica sheet, and the thickness of the basalt fiber mica tape is 0.05 mm; the basalt fiber mica tape is obtained by coating the surface of the basalt fiber with an organic polymer-derived ceramic material, then covering the mica sheet, and baking at high temperature, and the organic polymer-derived ceramic material adopts polysilazane; the mass ratio of the basalt fiber to the organic polymer-derived ceramic material is 9:1; the mass ratio of the mica sheet to the basalt fiber is 7:3; the temperature of high-temperature baking is 220°C; the mica sheet of the basalt fiber mica tape is composited on a single surface of the basalt fiber, and during the wrapping process, the basalt fiber faces outward and the mica sheet faces inward.

[0032] That is, a thin outer layer of polymer-derived ceramic-cured basalt fiber wrapped with nickel-plated copper flat wire, with basalt fiber mica tape as the main insulating material and wrapped around the surface of the copper wire, and then organic polymer-derived ceramic material is impregnated on the surface of the basalt fiber mica tape, and high-temperature baking is performed to obtain a high-temperature resistant mica wrapped wire.

[0033] The invention also includes a method for preparing a nickel-plated copper flat wire wrapped with a thin outer layer of polymer-derived ceramic-cured basalt fiber, comprising the following steps: Step 1, using a basalt fiber mica tape to wrap around the surface of a nickel-plated flat copper tape to form a wrapped flat copper tape; the number of layers of the basalt fiber mica tape is one layer; Step 2, dip-coating the wrapped flat copper strip with an organic polymer-derived ceramic material, and keeping it at a constant temperature for 2 hours to obtain a prefabricated wrapped wire; the amount of the organic polymer-derived ceramic material used is 2.5%; the temperature of the constant temperature is 20° C., and the extrusion pressure of the static state is 2 MPa; Step 3, baking and curing the prefabricated wrapped wire to obtain a thin outer layer polymer-derived ceramic-cured basalt fiber wrapped nickel-plated copper rectangular wire, wherein the baking and curing is performed by static baking and curing or by baking and curing in a line manner, and the baking and curing temperature is 410° C. and the baking time is 24 hours; Nickel-plated flat copper strip is made by rolling, drawing and extrusion to prepare copper flat wire. The surface of the copper flat wire is completely covered with a layer of pure nickel or nickel alloy with a thickness of 100μm by electroplating or spraying.

[0034] The basalt fiber mica tape is obtained by coating the surface of basalt fiber with an organic polymer-derived ceramic material and then covering it with a mica sheet, and then baking it at a high temperature, wherein the temperature of the high temperature baking is 150°C.

[0035] The wrapped wire prepared in this embodiment is wrapped with a single layer of 0.05 mm basalt fiber mica tape, and has a breakdown voltage of ≥6000 V, a PDIV of 1300 V, and a specific volume resistance of 1*10 13 , tensile strength is 4900MPa, elongation at break is 1.5, and thermal conductivity is 0.025W / m•K.

[0036] Example 2 A polymer-derived ceramic cured wrapped flat wire comprises a conductor and a basalt fiber mica tape wrapped around the outer layer of the conductor, wherein the basalt fiber mica tape is coated with two layers, and the thickness of the single layer basalt fiber mica tape is 0.15 mm, and the basalt fiber mica tape is composited by basalt fiber and mica sheet, and the total thickness of the basalt fiber mica tape is 0.3 mm; the basalt fiber mica tape is obtained by coating the surface of the basalt fiber with an organic polymer-derived ceramic material, then covering the mica sheet, and baking at high temperature, wherein the organic polymer-derived ceramic material adopts polysilazane; the mass ratio of the basalt fiber to the organic polymer-derived ceramic material is 30:1; the mass ratio of the mica sheet to the basalt fiber is 30:3; the high-temperature baking temperature is 190°C; the mica sheet of the basalt fiber mica tape is composited on a single surface of the basalt fiber, and during the wrapping process, the basalt fiber faces outward and the mica sheet faces inward.

[0037] That is, a thin outer layer of polymer-derived ceramic-cured basalt fiber wrapped with nickel-plated copper flat wire, with basalt fiber mica tape as the main insulating material and wrapped around the surface of the copper wire, and then organic polymer-derived ceramic material is impregnated on the surface of the basalt fiber mica tape, and high-temperature baking is performed to obtain a high-temperature resistant mica wrapped wire.

[0038] The conductor is a nickel-plated copper flat wire, the length of the flat wire cross section is 5 mm, and the height is 10 mm; the nickel-plated copper flat wire is prepared by a drawing process to form a bare copper flat wire, and the outer layer is nickel-plated by electroplating, and the thickness of the nickel plating layer is 60±20 microns.

[0039] The basalt fiber mica tape is formed by connecting and compounding mica sheets and basalt fibers through organic polymer-derived ceramic materials, and the conductor is coated by the mica sheets and basalt fibers in sequence from the inside to the outside.

[0040] The organic polymer derived ceramic material is polysilazane or a polysilazane derivative (polysilazane is preferred in this embodiment) with a viscosity of 10000 cps.

[0041] The mass ratio of the basalt fiber to the organic polymer derived ceramic material is 9:1.

[0042] The basalt fiber mica tape is composited with basalt fiber and mica sheet, and the thickness of the basalt fiber mica tape is 0.08 mm; the basalt fiber mica tape is obtained by coating the surface of the basalt fiber with an organic polymer-derived ceramic material, then covering the mica sheet, and baking at high temperature, and the organic polymer-derived ceramic material adopts polysilazane; the mass ratio of the basalt fiber to the organic polymer-derived ceramic material is 30:1; the mass ratio of the mica sheet to the basalt fiber is 30:3; the high-temperature baking temperature is 400°C; the mica sheet of the basalt fiber mica tape is composited on a single surface of the basalt fiber, and during the wrapping process, the basalt fiber faces outward and the mica sheet faces inward.

[0043] The invention also includes a method for preparing a nickel-plated copper flat wire wrapped with a thin outer layer of polymer-derived ceramic-cured basalt fiber, comprising the following steps: Step 1, using basalt fiber mica tape to wrap around the surface of the nickel-plated flat copper tape to form a wrapped flat copper tape; the number of layers of the basalt fiber mica tape is set to two; Step 2, dip-coating the wrapped flat copper strip with an organic polymer-derived ceramic material, and keeping it at a constant temperature for 4 hours to obtain a prefabricated wrapped wire; the amount of the organic polymer-derived ceramic material used is 1.5%; the temperature of the constant temperature is 30° C., and the extrusion pressure of the static state is 3MPa; Step 3, baking and curing the prefabricated wrapped wire to obtain a thin outer layer polymer-derived ceramic-cured basalt fiber wrapped nickel-plated copper flat wire, the baking and curing is carried out by static baking and curing or in a line manner, the baking and curing temperature is 480°C, and the baking time is 24 hours.

[0044] Nickel-plated flat copper strip is made by rolling, drawing and extrusion to prepare copper flat wire. A layer of pure nickel layer or nickel alloy layer with a thickness of 200μm is completely covered on the surface of the copper flat wire by electroplating or spraying.

[0045] The basalt fiber mica tape is obtained by coating the surface of basalt fiber with an organic polymer-derived ceramic material and then covering it with a mica sheet, and then baking it at a high temperature, wherein the temperature of the high temperature baking is 400°C.

[0046] The wrapped wire prepared in this embodiment is wrapped with a double layer of 0.15 mm basalt fiber mica tape, and has a breakdown voltage of ≥6000 V, a PDIV of 1800 V, and a specific volume resistance of 1*10 14 , tensile strength is 500MPa, elongation at break is 1.6, and thermal conductivity is 0.03W / m•K.

[0047] Example 3 A polymer-derived ceramic cured wrapped flat wire comprises a conductor and a basalt fiber mica tape wrapped around the outer layer of the conductor, wherein the basalt fiber mica tape is coated with two layers, the thickness of a single layer of the basalt fiber mica tape is 0.3 mm, and the basalt fiber mica tape is composited by basalt fiber and mica sheets, and the total thickness of the basalt fiber mica tape is 0.6 mm; the basalt fiber mica tape is obtained by coating the surface of the basalt fiber with an organic polymer-derived ceramic material, then covering the mica sheets, and baking at high temperature, wherein the organic polymer-derived ceramic material is polysilazane; the mass ratio of the basalt fiber to the organic polymer-derived ceramic material is 99:1; the mass ratio of the mica sheets to the basalt fiber is 57:3; the high-temperature baking temperature is 250°C; the mica sheets of the basalt fiber mica tape are composited on a single surface of the basalt fiber, and during the wrapping process, the basalt fiber faces outwards and the mica sheets face inwards.

[0048] That is, a thin outer layer of polymer-derived ceramic-cured basalt fiber wrapped with nickel-plated copper flat wire, with basalt fiber mica tape as the main insulating material and wrapped around the surface of the copper wire, and then organic polymer-derived ceramic material is impregnated on the surface of the basalt fiber mica tape, and high-temperature baking is performed to obtain a high-temperature resistant mica wrapped wire.

[0049] The conductor is a nickel-plated copper flat wire, the length of the flat wire cross section is 5 mm, and the height is 10 mm; the bare copper flat wire is prepared by a rolling process, and nickel is plated on the outer layer by electroplating, and the thickness of the nickel plating layer is 120±20 microns.

[0050] The basalt fiber mica tape is formed by connecting and compounding mica sheets and basalt fibers through organic polymer-derived ceramic materials, and the conductor is coated by the mica sheets and basalt fibers in sequence from the inside to the outside.

[0051] The organic polymer derived ceramic material is polysilazane or a polysilazane derivative (polysilazane is preferred in this embodiment) with a viscosity of 10000 cps.

[0052] The mass ratio of the basalt fiber to the organic polymer derived ceramic material is 80:1.

[0053] The invention also includes a method for preparing a nickel-plated copper flat wire wrapped with a thin outer layer of polymer-derived ceramic-cured basalt fiber, comprising the following steps: Step 1, using basalt fiber mica tape to wrap around the surface of the nickel-plated flat copper tape to form a wrapped flat copper tape; the number of layers of the basalt fiber mica tape is three; Step 2, dip-coating the wrapped flat copper strip with an organic polymer-derived ceramic material, and keeping it at a constant temperature for 3 hours to obtain a prefabricated wrapped wire; the amount of the organic polymer-derived ceramic material used is 14%; the temperature of the constant temperature is 25° C., and the extrusion pressure of the static state is 3 MPa; Step 3, baking and curing the prefabricated wrapped wire to obtain a thin outer layer polymer-derived ceramic-cured basalt fiber wrapped nickel-plated copper flat wire, the baking and curing is carried out by static baking and curing or in a line manner, the baking and curing temperature is 600°C, and the baking time is 24 hours.

[0054] Nickel-plated flat copper strip is made by rolling, drawing and extrusion to prepare copper flat wire. The surface of the copper flat wire is completely covered with a layer of pure nickel or nickel alloy with a thickness of 100μm by electroplating or spraying.

[0055] The basalt fiber mica tape is obtained by coating the surface of basalt fiber with an organic polymer-derived ceramic material and then covering it with a mica sheet, and then baking it at a high temperature, wherein the baking temperature is 220°C.

[0056] The wrapped wire prepared in this embodiment is wrapped with a double layer of 0.3 mm basalt fiber mica tape in a 50% overlap manner. Before high-temperature baking, the breakdown voltage is ≥2500V, and the PDIV is ≥1000V; after heat treatment, the breakdown voltage is ≥6000V, the PDIV is ≥1800V, and the specific volume resistance is 1*10 14 , tensile strength is 550MPa, elongation at break is 1.6, and thermal conductivity is 0.03W / m•K.

[0057] Example 4 A polymer-derived ceramic cured wrapped flat wire comprises a conductor and a basalt fiber mica tape wrapped around the outer layer of the conductor, wherein the basalt fiber mica tape is coated with two layers, the thickness of the basalt fiber mica tape is 0.07 mm, the basalt fiber mica tape is composited by basalt fiber and mica flakes, and the thickness of the basalt fiber mica tape is 0.15 mm; the basalt fiber mica tape is obtained by coating the surface of the basalt fiber with an organic polymer-derived ceramic material, then covering the mica flakes, and baking at high temperature, wherein the organic polymer-derived ceramic material adopts polysilazane; the mass ratio of the basalt fiber to the organic polymer-derived ceramic material is 96:4; the mass ratio of the mica flakes to the basalt fiber is 90:10; the high-temperature baking temperature is 250°C; the mica flakes of the basalt fiber mica tape are composited on a single surface of the basalt fiber, and during the wrapping process, the basalt fiber faces outwards and the mica flakes face inwards.

[0058] That is, a thin outer layer of polymer-derived ceramic-cured basalt fiber wrapped with nickel-plated copper flat wire, with basalt fiber mica tape as the main insulating material and wrapped around the surface of the copper wire, and then organic polymer-derived ceramic material is impregnated on the surface of the basalt fiber mica tape, and high-temperature baking is performed to obtain a high-temperature resistant mica wrapped wire.

[0059] The conductor is a nickel-plated copper flat wire, the cross-section of which is 10 mm long and 20 mm high. The bare copper flat wire is prepared by a rolling process, and the outer layer is nickel-plated by electroplating, and the thickness of the nickel-plated layer is 120±20 microns.

[0060] The basalt fiber mica tape is formed by connecting and compounding mica sheets and basalt fibers through organic polymer-derived ceramic materials, and the conductor is coated by the mica sheets and basalt fibers in sequence from the inside to the outside.

[0061] The organic polymer derived ceramic material is polysilazane or a polysilazane derivative (preferably a polysilazane derivative in this embodiment) with a viscosity of 15000 cps.

[0062] The mass ratio of the basalt fiber to the organic polymer derived ceramic material is 9:1.

[0063] The invention also includes a method for preparing a nickel-plated copper flat wire wrapped with a thin outer layer of polymer-derived ceramic-cured basalt fiber, comprising the following steps: Step 1, using basalt fiber mica tape to wrap around the surface of the nickel-plated flat copper tape to form a wrapped flat copper tape; the number of layers of the basalt fiber mica tape is three; Step 2, dip-coating the wrapped flat copper strip with an organic polymer-derived ceramic material, and keeping it at a constant temperature for 3 hours to obtain a prefabricated wrapped wire; the amount of the organic polymer-derived ceramic material used is 4%; the temperature of the constant temperature is 25° C., and the extrusion pressure of the static state is 3 MPa; Step 3, baking and curing the prefabricated wrapped wire to obtain a thin outer layer polymer-derived ceramic-cured basalt fiber wrapped nickel-plated copper flat wire, the baking and curing is carried out by static baking and curing or in a line manner, the baking and curing temperature is 480°C, and the baking time is 24 hours.

[0064] Nickel-plated flat copper strip is made by rolling, drawing and extrusion to prepare copper flat wire. A layer of pure nickel layer or nickel alloy layer with a thickness of 200μm is completely covered on the surface of the copper flat wire by electroplating or spraying.

[0065] The basalt fiber mica tape is obtained by coating the surface of basalt fiber with an organic polymer-derived ceramic material and then covering it with a mica sheet, and then baking it at a high temperature, wherein the baking temperature is 300°C.

[0066] The wrapped wire prepared in this embodiment is wrapped by double-layer 0.07 mm basalt fiber mica tape in a 50% overlap manner. Before high-temperature baking, the breakdown voltage is ≥5000 V, the PDIV is 2000 V, and the specific volume resistance is 1*10 14 , tensile strength is 500MPa, elongation at break is 1.8, and thermal conductivity is 0.035W / m•K.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A polymer-derived ceramic-cured wrapped rectangular wire, characterized in that: The invention comprises a conductor and a basalt fiber mica tape wrapped around the outer layer of the conductor, wherein the basalt fiber mica tape is coated with at least one layer, and the thickness of a single layer of the basalt fiber mica tape is 0.05-0.3 mm.

2. A polymer-derived ceramic-cured wrapped rectangular wire and a preparation method thereof as claimed in claim 1, characterized in that: The conductor is a nickel-plated copper flat wire, the length of the flat wire cross section is 0.2-10 mm, and the height is 1-20 mm.

3. A polymer-derived ceramic-cured wrapped rectangular wire and a preparation method thereof as claimed in claim 2, characterized in that: The basalt fiber mica tape is formed by connecting and compounding mica sheets and basalt fibers through organic polymer-derived ceramic materials, and the conductor is coated by the mica sheets and basalt fibers in sequence from the inside to the outside.

4. A polymer-derived ceramic-cured wrapped rectangular wire and a method for preparing the same as claimed in claim 3, characterized in that: The organic polymer derived ceramic material adopts polysilazane or polysilazane derivatives, and has a viscosity of 1000-20000 cps.

5. A polymer-derived ceramic-cured wrapped rectangular wire and a method for preparing the same as claimed in claim 3, characterized in that: When the basalt fiber mica tape is provided in multiple layers, the tape is wound in a spiral shape in an interlaced manner, and the total thickness of the basalt fiber mica tape is 0.3-0.6 mm.

6. A polymer-derived ceramic-cured wrapped rectangular wire and a method for preparing the same as claimed in claim 1, characterized in that: The mass ratio of the basalt fiber to the organic polymer derived ceramic material is 9 to 99:

1.

7. A polymer-derived ceramic-cured wrapped rectangular wire and a method for preparing the same as claimed in claim 1, characterized in that: The mass ratio of the mica sheet to the basalt fiber is 7 to 57:

3.

8. The thin outer layer polymer-derived ceramic-cured basalt fiber wrapped with nickel-plated copper rectangular wire according to any one of claims 1 to 7, characterized in that: The method for preparing the thin outer layer polymer-derived ceramic-cured basalt fiber wrapped with nickel-plated copper flat wire comprises the following steps: Step 1, using basalt fiber mica tape to wrap around the surface of the nickel-plated flat copper tape to form a wrapped flat copper tape; the basalt fiber mica tape has at least one layer; Step 2, dip-coating the wrapped flat copper strip with an organic polymer-derived ceramic material, and standing it at a constant temperature for 2 to 4 hours to obtain a prefabricated wrapped wire; the concentration of the organic polymer-derived ceramic material is 0.1 to 30%; the temperature of the constant temperature is 20 to 30° C., and the extrusion pressure of the standing is 0.1 to 5 MPa; Step 3, baking and curing the prefabricated wrapped wire to obtain a polymer-derived ceramic cured wrapped flat wire, wherein the baking and curing is performed by static baking and curing or in a line manner, and the baking and curing temperature is 400-600°C.

9. The nickel-plated copper flat wire according to claim 8, characterized in that: The nickel-plated flat copper strip is prepared by rolling, drawing and extrusion to form a copper flat wire. A pure nickel layer or a nickel alloy layer with a thickness of 1 to 200 μm is completely covered on the surface of the copper flat wire by electroplating or spraying.

10. The nickel-plated copper flat wire according to claim 9, characterized in that: The basalt fiber mica tape is obtained by coating the surface of basalt fiber with an organic polymer-derived ceramic material and then covering it with mica sheets, and then baking it at high temperature. The high-temperature baking temperature is 150-400°C.