High-temperature-resistant coaxial connector based on high-temperature anti-oxidation conductor coating and preparation method of high-temperature-resistant coaxial connector

Abstract

The invention relates to the technical field of electromagnetic functional materials and devices, and particularly discloses a high-temperature-resistant coaxial connector based on a high-temperature anti-oxidation conductor coating, which is structurally and mainly composed of a metal connector, a high-temperature conductive shielding layer, a dielectric medium and an inner conductor, and is characterized in that the high-temperature conductive shielding layer is coated on the surface of the dielectric medium; the metal connector is a metal connector which is resistant to high temperature, resistant to oxidation, high in conductivity and low in thermal expansion coefficient. The high-temperature conductive shielding layer is a high-temperature anti-oxidation conductor coating shielding layer; the dielectric medium is oxide ceramic with high temperature resistance, wide temperature range, stable dielectric property and low thermal conductivity or a composite material thereof; the inner conductor is a conductive wire core made of a high-temperature-resistant antioxidant metal material. According to the high-temperature-resistant coaxial connector, thermal matching connection and wide-temperature-range stable feeding between signal receiving and transmitting terminals such as an antenna array plane with the temperature larger than 600 DEG C and a normal-temperature TR assembly can be achieved, and the high-temperature-resistant coaxial connector has good engineering application value of coaxial feeding connectors of electronic devices such as high-temperature environment antennas.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic functional materials and devices, and in particular to a high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating and its preparation method. Background Technology

[0002] Coaxial connectors are important power supply connections in electronic devices, primarily used for signal connections between transceiver signal processors and radiating transceiver antennas. For example, the electrical connection between a phased array antenna array and a transceiver module (TR) is achieved through a coaxial power supply connector. Currently, mature coaxial connectors mainly employ a material scheme using highly conductive inner conductors such as copper / aluminum, a polymer coaxial dielectric, and an outer shielding layer of metal / metal mesh.

[0003] For high-temperature electronic devices, the temperature of signal transceiver terminal equipment can reach 500~600℃, while the operating temperature of its signal processing electronic components is often no more than 60℃. This requires the coaxial connector between the two to meet the following requirements: (1) the temperature resistance of the power supply connection part with the signal transceiver terminal is above 500~600℃; (2) the connector has excellent heat insulation effect under high temperature conditions, and can keep the temperature of the other end connected to the signal processor electronic components below 60℃ for a short time. Existing coaxial connectors have the following problems: (1) the internal polymer coaxial dielectric has insufficient temperature resistance (usually below 150℃), (2) the outer metal / metal mesh shielding layer has high thermal conductivity, poor heat insulation effect under high temperature conditions, and the bottleneck problem of excessively high temperature at the connection end of the signal processor electronic components cannot meet the requirements of coaxial connectors for high-temperature electronic devices.

[0004] To address the aforementioned issues, this application proposes a high-temperature resistant coaxial connector based on a high-temperature oxidation-resistant conductor coating and its fabrication method. By employing a high-temperature resistant material system consisting of a high-temperature resistant metal connector, a high-temperature oxidation-resistant conductor coating shielding layer, an oxide ceramic or composite dielectric material, a high-temperature resistant metal inner conductor, and a low thermal conductivity dielectric and shielding layer, the bottleneck problems of insufficient temperature resistance and thermal insulation in traditional copper / aluminum inner conductor / polymer dielectric / metal shielding layer connectors under high-temperature operating conditions are solved. This high-temperature resistant coaxial connector can achieve thermal matching connection and stable power supply over a wide temperature range between transceiver terminals such as antenna arrays operating at temperatures >600℃ and room-temperature TR components, demonstrating significant engineering application value for coaxial power supply connectors for antennas and other electronic devices in high-temperature environments. Summary of the Invention

[0005] To address the above shortcomings, this invention provides a high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating and its manufacturing method. The high-temperature resistant coaxial connector features temperature resistance, thermal insulation, and high-temperature stability, enabling thermal matching and stable power supply over a wide temperature range between transceiver terminals such as antenna arrays at temperatures exceeding 600°C and room-temperature TR components. The specific technical solution is as follows: A high-temperature coaxial connector based on a high-temperature oxidation-resistant conductive coating comprises, from the outside to the inside, a metal connector, a high-temperature conductive shielding layer, a dielectric material, and an inner conductor. The high-temperature conductive shielding layer is coated on the surface of the dielectric material. The metal connector is heat-resistant to temperatures above 600°C, oxidation-resistant, and highly conductive (conductivity greater than 10). 5 S / m), low coefficient of thermal expansion (less than 10) -5 The connector is made of metal material with a temperature of 600℃; the high-temperature conductive shielding layer is a high-temperature anti-oxidation conductor coating shielding layer; the dielectric is an oxide ceramic or its composite material that is resistant to high temperatures above 600℃, has stable dielectric properties over a wide temperature range (dielectric constant 2.5~6.0 from room temperature to 600℃), and has low thermal conductivity (less than 3 W / m·K); the inner conductor is a conductive wire core made of metal material that is resistant to high temperatures of 1000℃ and has anti-oxidation properties.

[0006] Preferably, in the above-mentioned high-temperature coaxial connector based on a high-temperature antioxidant conductor coating, the metal connector with high temperature resistance, oxidation resistance, high conductivity, and low coefficient of thermal expansion refers to a connector with a temperature resistance of 600℃ and a conductivity greater than 10. 5 S / m, coefficient of thermal expansion less than 10 -5 / ℃.

[0007] Preferably, in the above-mentioned high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating, the high-temperature resistant, wide-temperature-range dielectric stable, low thermal conductivity oxide ceramic or its composite material refers to a temperature resistant of 600℃, a dielectric constant of 2.5~3.5 from room temperature to 600℃, and a thermal conductivity of less than 3 W / m·K.

[0008] Preferably, in the above-mentioned high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating, the high-temperature resistant antioxidant metal conductive core refers to a temperature resistant of 600°C or higher.

[0009] Preferably, in the above-mentioned high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating, the high-temperature conductive shielding layer comprises a metallic conductive phase and a quartz glass bonding phase, the thickness of the high-temperature conductive shielding layer is 5~10μm, and the sheet resistance is 0.03~0.1Ω / □, which can achieve excellent electromagnetic wave shielding effect. The dielectric material is in the shape of a coaxial cylindrical tube with an outer diameter of 2.5 mm and an inner diameter of 0.6 mm; the oxide ceramic is quartz ceramic or alumina ceramic, and the composite material is quartz fiber reinforced quartz ceramic matrix composite or alumina fiber reinforced alumina ceramic matrix composite.

[0010] Preferably, in the above-mentioned high-temperature resistant coaxial connector based on a high-temperature anti-oxidation conductor coating, the metal connector includes a TR component connector and a coaxial dielectric sleeve. The coaxial dielectric sleeve is fitted with a dielectric material coated with a high-temperature conductive shielding layer. The inner diameter of the TR component connector side of the metal connector is 3.06 mm and the outer diameter is 6 mm; the inner diameter of the coaxial dielectric sleeve is 2.54 mm and the outer diameter is 3 mm; the metal connector material is one of titanium, silver, copper, and stainless steel.

[0011] Preferably, in the above-mentioned high-temperature resistant coaxial connector based on a high-temperature anti-oxidation conductor coating, the inner conductor is a needle-shaped metal wire with different thicknesses at both ends. One end of the metal wire passes through the dielectric and extends into the interior of the metal connector, while the other end is located outside the coaxial dielectric tube. The diameter of the end of the metal wire extending into the connector is 0.4 mm, the length is 3.5 mm, and the radius of the rounded corner is 0.2 mm; the diameter of the other end is 0.6 mm and the length is 15.6 mm; the material is one of titanium, silver, copper, and stainless steel.

[0012] On the other hand, the present invention also provides a method for preparing the above-mentioned high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating, comprising the following steps: (1) Metal connector preparation: The high-temperature coaxial connector metal connector uses high-temperature resistant, oxidation resistant, high conductivity and low thermal expansion coefficient metal as raw material. First, a cylindrical metal blank is cut to obtain a rough blank. Then, according to the size specifications of the TR component connecting cable and the outer diameter of the coaxial dielectric, the cable connecting slot and dielectric sleeve are processed on the two ends of the blank respectively to obtain a high-temperature resistant and oxidation resistant metal connector. (2) Formulation of high-temperature conductive coating: The high-temperature conductive coating is composed of a metal powder conductive phase, a glass binder phase and an organic carrier; (3) Dielectric preparation: Using oxide ceramics or their composite materials as raw materials, according to the dielectric matching characteristics of the inner conductor of the coaxial connector, the inner and outer diameters of the dielectric are obtained by hot extrusion (oxide ceramics) or sol-gel impregnation (oxide ceramic composite materials) and mechanical processing methods. (4) Preparation of high temperature conductive shielding layer: The high temperature conductive coating prepared in step (2) is brushed onto the outer cylindrical surface of the dielectric, air-dried at room temperature and sintered at high temperature to obtain a high temperature anti-oxidation conductive shielding layer. The brushing-sintering process is repeated until the thickness and sheet resistance of the shielding layer meet the requirements, and finally a coaxial dielectric tube with a high temperature conductive shielding layer is obtained. (5) High-temperature coaxial connector assembly: The inner conductor of the high-temperature coaxial connector is a standard high-temperature metal conductor pin. The inner conductor and connector are cleaned with a cleaning agent to remove surface impurities. Then, the inner conductor is inserted into the coaxial dielectric tube to the designated position. Finally, the inner conductor pin tip of the inner conductor / coaxial dielectric tube pre-assembly is inserted into the coaxial dielectric sleeve of the metal connector and clamped to complete the high-temperature coaxial connector assembly.

[0013] Preferably, in the above preparation method, step (2) of the high-temperature conductive coating preparation specifically includes: firstly, washing and drying the metal powder, which is one or more of aluminum, silver, platinum, palladium, and nickel; secondly, melting and quenching the quartz glass raw material to obtain pure glass slag, using an organic solvent as a dispersant, pulverizing the glass slag by ball milling, drying and sieving to obtain glass powder; uniformly mixing the metal powder and glass powder at a mass ratio of 1:1 to obtain a mixed powder, then mixing the mixed powder with an organic carrier at a certain mass ratio, stirring and dispersing, and repeatedly rolling the resulting suspension using a three-roll mill to obtain a high-temperature conductive coating.

[0014] Preferably, in the above preparation method, the metal powder is washed with water and ethanol; the organic solvent used for ball milling the glass slag is ethanol or acetone; and the metal powder and glass powder are mixed by stirring with a star gravity mixer.

[0015] Preferably, in the above preparation method, the mass ratio of the mixed powder to the organic carrier is 75%~80% mixed powder and 20%~25% organic carrier; the organic carrier includes 80~90% tributyl citrate, 2~5% nitrocellulose, and 5~18% lecithin by mass fraction.

[0016] Preferably, in the above preparation method, step (4) specifically involves: cleaning the outer arc surface of the coaxial cylindrical tubular dielectric by using a high-temperature heat treatment + cleaning agent method; using a brush to apply high-temperature conductive coating evenly along the outer cylindrical surface; and brushing in a clockwise or counterclockwise unidirectional direction. Then, the high-temperature anti-oxidation conductive shielding layer is obtained by room temperature drying and high-temperature sintering. The brushing-sintering process is repeated until the shielding layer thickness and sheet resistance meet the requirements, and finally a coaxial dielectric tube with a high-temperature conductive shielding layer is obtained.

[0017] Preferably, in the above preparation method, in step (4), the high-temperature sintering is sintering at 800℃ for 0.5~2h.

[0018] Preferably, in the above preparation method, in step (5), during the assembly process, the inner conductor is inserted into the coaxial dielectric tube to a specified position, meaning that the 0.4 mm diameter portion just extends out of the coaxial dielectric tube.

[0019] Preferably, in the above preparation method, in step (5), the cleaning agent for the conductor and connector during the assembly process is ethanol or acetone.

[0020] Compared with the prior art, the beneficial effects of the present invention are: 1. The high-temperature coaxial connector based on a high-temperature antioxidant conductor coating of the present invention solves the bottleneck problems of insufficient temperature resistance and insufficient heat insulation of traditional copper / aluminum inner conductor / polymer dielectric / metal shielding layer connectors in high-temperature operating environments by adopting a high-temperature resistant metal connector, a high-temperature antioxidant conductor coating shielding layer, an oxide ceramic or composite dielectric material, a high-temperature resistant metal inner conductor, and a low thermal conductivity dielectric. This high-temperature resistant coaxial connector can achieve thermal matching connection and wide-temperature stable feeding between transceiver terminals such as antenna arrays with temperatures >600℃ and TR components at room temperature, and has great engineering application value for coaxial feeding connectors for antennas and other electronic devices in high-temperature environments.

[0021] 2. The high-temperature conductive coating used in the dielectric surface shielding layer of the high-temperature coaxial connector of this invention has significant advantages over metal coatings obtained by traditional physical / chemical plating methods, such as low cost and resistance to oxidation and corrosion, and can meet the requirements for use in large-volume, high-temperature oxidizing environments. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a structural diagram of the high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating, according to the present invention.

[0024] Figure 2 This invention relates to a high-temperature conductive coating.

[0025] Figure 3 This is a photograph of the quartz dielectric material of this invention.

[0026] Figure 4 This is a photograph of the dielectric material after the high-temperature conductive shielding layer of this invention has been prepared.

[0027] Figure 5 This is a photograph of the actual high-temperature resistant coaxial connector of this invention.

[0028] Main diagram descriptions: 1-Metal connector, 2-High temperature conductive shielding layer, 3-Dielectric medium, 4-Inner conductor, 5-Coaxial dielectric sleeve, 6-TR component connector, 7-Fine needle tip, 8-Thick conductor. Detailed Implementation

[0029] The specific embodiments of the present invention are described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments. Unless otherwise defined, all technical terms used below have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the scope of protection of the present invention. Unless otherwise specifically stated, all raw materials, reagents, instruments, and equipment used in the present invention are commercially available or can be prepared by existing methods.

[0030] Example 1 A high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating, such as Figure 1 As shown, the device includes a metal connector 1, a high-temperature conductive shielding layer 2, a dielectric 3, and an inner conductor 4. The metal connector includes a TR component connector 6 and a coaxial dielectric sleeve 5. The dielectric 3 is a coaxial dielectric cylindrical tube. The high-temperature conductive shielding layer 2 is coated on the outer arc surface of the dielectric 3. The inner conductor 4 is a needle-shaped metal wire with different thicknesses at both ends, specifically composed of a fine needle tip 7 and a thick wire body 8 connected in one piece. One end of the dielectric 3 coated with the high-temperature conductive shielding layer 2 is sleeved inside the coaxial dielectric sleeve 6. The inner conductor 4 passes through the interior of the dielectric 3. The fine needle tip 7 extends entirely into the metal connector 1. One end of the thick wire body 8 is located inside the dielectric 3, and the other end is located outside the dielectric 3.

[0031] Furthermore, in the metal connector 1, the inner diameter of the TR component connector 6 is 3.06 mm, the outer diameter is 6 mm, and the length is 5 mm; the inner diameter of the coaxial dielectric sleeve is 2.54 mm, the outer diameter is 3 mm, and the length is 3 mm; the metal connector 1 is a metal connector made of high temperature resistance, oxidation resistance, high conductivity, and low thermal expansion coefficient, and is one of titanium, silver, copper, and stainless steel. In this embodiment, it is specifically stainless steel.

[0032] Furthermore, the fine needle tip 7 has a diameter of 0.4 mm, a length of 3.5 mm, and a rounded end radius of 0.2 mm; the thick conductor body 8 has a diameter of 0.6 mm and a length of 15.6 mm; the inner conductor 4 is made of one of titanium, silver, copper, or stainless steel, and in this embodiment, it is specifically copper.

[0033] Furthermore, the dielectric 3 has an outer diameter of 2.5 mm, an inner diameter of 0.6 mm, and a length of 10 mm. It is made of high-temperature resistant, wide-temperature-range stable dielectric properties, and low thermal conductivity oxide ceramic or its composite material, specifically quartz.

[0034] Furthermore, the high-temperature conductive shielding layer is composed of a metallic conductive phase and a quartz glass bonding phase. The metallic conductive phase is silver, the thickness of the high-temperature conductive shielding layer is 8μm, and the sheet resistance is 0.05Ω / □.

[0035] This embodiment also provides a method for preparing a high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating, including the following steps: (1) Metal connector preparation: The high-temperature coaxial connector metal connector uses stainless steel as raw material. First, a cylindrical metal blank is cut to obtain a rough blank. Then, according to the size specifications of the TR component connecting cable and the outer diameter of the coaxial dielectric, the cable connecting slot (TR component connector) and the dielectric sleeve are processed on the two ends of the blank to obtain a high-temperature resistant and oxidation-resistant metal connector. (2) Formulation of high-temperature conductive coating: The high-temperature resistant reconnaissance antenna adopts a high-temperature conductive coating material scheme. The high-temperature conductive coating is composed of silver powder conductive phase, glass binder phase and organic carrier. First, the metal powder is washed and dried with ethanol. Then, the glass raw material is melted and water-quenched to obtain pure glass slag. Using ethanol as dispersant, the obtained glass slag is crushed by ball milling. After drying, it is sieved to obtain glass powder. The metal powder and glass powder (mass ratio 1:1) are stirred and mixed evenly using a star gravity mixer. Then, the mixed powder is mixed with the organic carrier at a mass ratio of 80%:20%, stirred and dispersed, and then repeatedly rolled using a three-roll mill to obtain the high-temperature conductive coating (see Figure 2 ); (3) Dielectric preparation: Using quartz as raw material, according to the dielectric matching characteristics of the inner conductor of the coaxial connector, the inner and outer diameters of the dielectric are prepared by hot extrusion and mechanical processing to obtain the coaxial cylindrical tubular dielectric. (4) Preparation of high temperature conductive shielding layer: The conductive shielding layer is an electromagnetic shielding layer on the outer surface of a coaxial cylindrical tubular dielectric. It is prepared by brushing and sintering high temperature conductive coating. First, the surface of the outer arc surface of the disc quartz substrate is cleaned by high temperature heat treatment and cleaning agent. The high temperature conductive coating is applied by brushing and evenly clockwise along the outer cylindrical surface. Then, it is air-dried at room temperature and sintered at high temperature (800℃-0.5h). The brushing and sintering process is repeated until the thickness and sheet resistance of the shielding layer meet the requirements. Finally, a coaxial dielectric tube with a high temperature conductive shielding layer is obtained. (5) High-temperature coaxial connector assembly: The inner conductor of the high-temperature coaxial connector is a standard high-temperature metal conductor pin. The connector assembly process first uses ethanol to wipe the inner conductor and connector to remove surface impurities. Then, the inner conductor is inserted into the coaxial dielectric tube until the fine needle of the inner conductor just passes out of the coaxial dielectric tube to obtain the inner conductor / coaxial dielectric tube pre-assembly. Finally, the inner conductor pin tip of the inner conductor / coaxial dielectric tube pre-assembly is inserted into the coaxial dielectric sleeve of the metal connector and clamped to complete the high-temperature coaxial connector assembly.

[0036] The high-temperature coaxial connector with a high-temperature antioxidant conductor coating in this embodiment is used to conduct standing wave ratio (VSWR) characteristic tests on a phased array antenna array at 600°C. The phased array antenna can maintain effective power supply at both 600°C and normal temperature, and the VSWR of the antenna is ≤2. This verifies that the high-temperature coaxial connector prepared in this example can achieve thermal matching connection and stable power supply over a wide temperature range between the antenna array and other transceiver terminals in a 600°C high-temperature environment and the TR components at normal temperature.

[0037] Example 2 A high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating, such as Figure 1 As shown, the device includes a metal connector 1, a high-temperature conductive shielding layer 2, a dielectric 3, and an inner conductor 4. The metal connector includes a TR component connector 6 and a coaxial dielectric sleeve 5. The dielectric 3 is a coaxial dielectric cylindrical tube. The high-temperature conductive shielding layer 2 is coated on the outer arc surface of the dielectric 3. The inner conductor 4 is a needle-shaped metal wire with different thicknesses at both ends, specifically composed of a fine needle tip 7 and a thick wire body 8 connected in one piece. One end of the dielectric 3 coated with the high-temperature conductive shielding layer 2 is sleeved inside the coaxial dielectric sleeve 6. The inner conductor 4 passes through the interior of the dielectric 3. The fine needle tip 7 extends entirely into the metal connector 1. One end of the thick wire body 8 is located inside the dielectric 3, and the other end is located outside the dielectric 3.

[0038] Furthermore, in the metal connector 1, the inner diameter of the TR component connector 6 is 3.06 mm, the outer diameter is 6 mm, and the length is 5 mm; the inner diameter of the coaxial dielectric sleeve is 2.54 mm, the outer diameter is 3 mm, and the length is 3 mm; the metal connector 1 is a metal connector made of high temperature resistance, oxidation resistance, high conductivity, and low thermal expansion coefficient, and is one of titanium, silver, copper, and stainless steel. In this embodiment, it is specifically titanium.

[0039] Furthermore, the fine needle tip 7 has a diameter of 0.4 mm, a length of 3.5 mm, and a rounded end radius of 0.2 mm; the thick conductor body 8 has a diameter of 0.6 mm and a length of 15.6 mm; the inner conductor 4 is made of one of titanium, silver, copper, or stainless steel, and in this embodiment, it is specifically titanium.

[0040] Furthermore, the dielectric 3 has an outer diameter of 2.5 mm, an inner diameter of 0.6 mm, and a length of 10 mm. It is made of high-temperature resistant, wide-temperature-range stable dielectric properties, and low thermal conductivity oxide ceramic or its composite material, specifically quartz.

[0041] Furthermore, the high-temperature conductive shielding layer is composed of a metallic conductive phase and a quartz glass bonding phase. The metallic conductive phase is platinum, the thickness of the high-temperature conductive shielding layer is 8 μm, and the sheet resistance is 0.05 Ω / □.

[0042] This embodiment also provides a method for preparing a high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating, including the following steps: (1) Metal connector preparation: The high-temperature coaxial connector metal connector uses titanium as raw material. First, a cylindrical metal blank is cut to obtain a rough metal blank. Then, according to the size specifications of the TR component connecting cable and the outer diameter of the coaxial dielectric, the cable connecting slot (TR component connector) and the dielectric sleeve are processed on the two ends of the blank to obtain a high-temperature resistant and oxidation-resistant titanium connector. (2) Preparation of high temperature conductive coating: The high temperature resistant reconnaissance antenna adopts a high temperature conductive coating material scheme. The high temperature conductive coating is composed of platinum powder conductive phase, glass binder phase and organic carrier. First, the metal powder is washed and dried with ethanol. Then, the glass raw material is melted and quenched with water to obtain pure glass slag. Ethanol is used as dispersant. The obtained glass slag is crushed by ball milling. After drying, it is sieved to obtain glass powder. The metal powder and glass powder (mass ratio 3:7) are stirred and mixed evenly by a star gravity mixer. Then, the mixed powder is mixed with the organic carrier at a mass ratio of 75%:25%, stirred and dispersed, and then repeatedly rolled by a three-roll mill to obtain the high temperature conductive coating. (3) Dielectric preparation: Using quartz fiber reinforced quartz ceramic matrix composite material as raw material, and according to the inner and outer diameters of the dielectric dielectric required by the dielectric matching characteristics of the inner conductor of the coaxial connector, a coaxial cylindrical tubular dielectric is prepared by mechanical processing method. (4) Preparation of high temperature conductive shielding layer: The conductive shielding layer is an electromagnetic shielding layer on the outer surface of a coaxial cylindrical tubular dielectric. It is prepared by brushing and sintering high temperature conductive coating. First, the surface of the outer arc surface of the disc quartz substrate is cleaned by high temperature heat treatment and acetone cleaning agent. The high temperature conductive coating is applied evenly counterclockwise along the outer cylindrical surface with a brush. Then, it is air-dried at room temperature and sintered at high temperature (800℃-0.5h). The brushing and sintering process is repeated until the thickness and sheet resistance of the shielding layer meet the requirements. Finally, a coaxial dielectric tube with a high temperature conductive shielding layer is obtained. (5) High-temperature coaxial connector assembly: The inner conductor of the high-temperature coaxial connector is a standard high-temperature metal conductor pin. The connector assembly process first uses ethanol to wipe the inner conductor and connector to remove surface impurities. Then, the inner conductor is inserted into the coaxial dielectric tube until the fine needle of the inner conductor just passes out of the coaxial dielectric tube to obtain the inner conductor / coaxial dielectric tube pre-assembly. Finally, the inner conductor pin tip of the inner conductor / coaxial dielectric tube pre-assembly is inserted into the coaxial dielectric sleeve of the metal connector and clamped to complete the high-temperature coaxial connector assembly.

[0043] The high-temperature coaxial connector with a high-temperature antioxidant conductor coating in this embodiment is used to conduct standing wave ratio (VSWR) characteristic tests on a phased array antenna array at 600°C. The phased array antenna can maintain effective power supply at both 600°C and normal temperature, and the VSWR of the antenna is ≤2. This verifies that the high-temperature coaxial connector prepared in this example can achieve thermal matching connection and stable power supply over a wide temperature range between the antenna array and other transceiver terminals in a 600°C high-temperature environment and the TR components at normal temperature.

[0044] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating, characterized in that, Its structure mainly consists of a metal connector, a high-temperature conductive shielding layer, a dielectric, and an inner conductor. The high-temperature conductive shielding layer is coated on the surface of the dielectric. The metal connector has a temperature resistance of over 600℃ and a conductivity greater than 10. 5 The connector is made of S / m and is made of oxidation-resistant metal material; the high-temperature conductive shielding layer is a high-temperature oxidation-resistant conductor coating shielding layer; the dielectric is an oxide ceramic or its composite material with a dielectric constant of 2.5~6.0 and a thermal conductivity of less than 3 W / m·K at room temperature to 600℃; the inner conductor is an oxidation-resistant metal conductive wire core with a temperature resistance of over 600℃.

2. The high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating according to claim 1, characterized in that, The high-temperature conductive shielding layer comprises a metallic conductive phase and a quartz glass bonding phase, and the thickness of the high-temperature conductive shielding layer is 5~10μm, and the sheet resistance is 0.03~0.1Ω / □. The dielectric material is in the shape of a coaxial cylindrical tube with an outer diameter of 2.5 mm and an inner diameter of 0.6 mm; the oxide ceramic is quartz ceramic or alumina ceramic, and the composite material is quartz fiber reinforced quartz ceramic matrix composite or alumina fiber reinforced alumina ceramic matrix composite.

3. The high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating according to claim 1, characterized in that, The metal connector includes a TR component connector and a coaxial dielectric sleeve. The coaxial dielectric sleeve is fitted with a dielectric material coated with a high-temperature conductive shielding layer. The inner diameter of the metal connector on the TR component connection side is 3.06 mm and the outer diameter is 6 mm. The inner diameter of the coaxial dielectric sleeve is 2.54 mm and the outer diameter is 3 mm. The metal connector is made of one of titanium, silver, copper, or stainless steel.

4. The high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating according to claim 1, characterized in that, The inner conductor is a needle-shaped metal wire with different thicknesses at both ends. One end of the metal wire passes through the dielectric and extends into the interior of the metal connector, while the other end is located outside the coaxial dielectric tube. The end of the metal wire extending into the connector has a diameter of 0.4 mm, a length of 3.5 mm, and a rounded corner radius of 0.2 mm; the other end has a diameter of 0.6 mm and a length of 15.6 mm. The material is one of titanium, silver, copper, or stainless steel.

5. A method for preparing a high-temperature resistant coaxial connector based on a high-temperature antioxidant conductor coating as described in claims 1-4, characterized in that, Includes the following steps: (1) Metal connector preparation: First, the metal is cut to obtain a cylindrical metal blank. Then, according to the size specifications of the TR component connecting cable and the outer diameter of the coaxial dielectric, the cable connecting slot and the dielectric sleeve are processed on the two ends of the blank to obtain a high temperature resistant and oxidation resistant metal connector. (2) Formulation of high-temperature conductive coating: The high-temperature conductive coating is composed of a metal powder conductive phase, a glass binder phase and an organic carrier; (3) Dielectric preparation: Using oxide ceramics or their composite materials as raw materials, according to the inner and outer diameters of the dielectric dielectric required by the dielectric matching characteristics of the inner conductor of the coaxial connector, the coaxial cylindrical tubular dielectric is obtained by hot extrusion or sol-gel impregnation and mechanical processing. (4) Preparation of high temperature conductive shielding layer: The high temperature conductive coating prepared in step (2) is brushed onto the outer cylindrical surface of the dielectric, air-dried at room temperature and sintered at high temperature to obtain a high temperature anti-oxidation conductive shielding layer. The brushing-sintering process is repeated until the thickness and sheet resistance of the shielding layer meet the requirements, and finally a coaxial dielectric tube with a high temperature conductive shielding layer is obtained. (5) High-temperature coaxial connector assembly: The inner conductor of the high-temperature coaxial connector is a standard high-temperature metal conductor pin. The inner conductor and connector are cleaned with a cleaning agent to remove surface impurities. Then, the inner conductor is inserted into the coaxial dielectric tube to the designated position. Finally, the inner conductor pin tip of the inner conductor / coaxial dielectric tube pre-assembly is inserted into the coaxial dielectric sleeve of the metal connector and clamped to complete the high-temperature coaxial connector assembly.

6. The preparation method according to claim 5, characterized in that, In step (2), the preparation of the high-temperature conductive coating specifically includes: first, washing and drying the metal powder, which is one or more of aluminum, silver, platinum, palladium, and nickel; second, melting and quenching the quartz glass raw material to obtain pure glass slag, using an organic solvent as a dispersant, pulverizing the glass slag by ball milling, drying and sieving to obtain glass powder; uniformly mixing the metal powder and glass powder to obtain a mixed powder, then mixing the mixed powder with an organic carrier at a certain mass ratio, stirring and dispersing, and repeatedly rolling the resulting suspension using a three-roll mill to obtain the high-temperature conductive coating.

7. The preparation method according to claim 6, characterized in that, The mass ratio of the mixed powder to the organic carrier is 75%~80% mixed powder and 20%~25% organic carrier; the organic carrier includes 80~90% tributyl citrate, 2~5% nitrocellulose and 5~18% lecithin by mass fraction.

8. The preparation method according to claim 5, characterized in that, The specific steps (4) are as follows: the surface of the outer arc surface of the coaxial cylindrical tubular dielectric is cleaned by high temperature heat treatment and cleaning agent. High temperature conductive coating is applied evenly along the outer cylindrical surface by using a brush dipped in it. The brushing method is to brush in one direction, either clockwise or counterclockwise. Then, the high temperature anti-oxidation conductive shielding layer is obtained by drying at room temperature and sintering at high temperature. The brushing-sintering process is repeated until the thickness and sheet resistance of the shielding layer meet the requirements. Finally, a coaxial dielectric tube with a high temperature conductive shielding layer is obtained.

9. The preparation method according to claim 5, characterized in that, In step (5), during the assembly process, the inner conductor is inserted into the coaxial dielectric tube until the specified position is reached, where the 0.4mm diameter portion just extends out of the coaxial dielectric tube.

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