Radome connection area thermal isolation structure and forming method thereof

Abstract

The application relates to the technical field of high Mach radar radome connecting area heat insulation structural members, and discloses a radome connecting area heat insulation structural member which sequentially comprises an outer heat insulation layer, a ceramic layer, a metal layer and a heat storage layer; the outer heat insulation layer is a quartz fiber reinforced low-density phenolic resin composite material; the ceramic layer is a quartz fiber reinforced quartz composite ceramic; the metal layer is a low-expansion alloy steel; and the inner layer of the heat storage layer is an inorganic salt phase change material, and the outer layer is coated with a copper foil layer. The application further discloses a forming method of the radome connecting area heat insulation structural member. The radome connecting area heat insulation structural member and the forming method thereof can effectively guarantee the temperature of the connecting area and have a remarkable cooling effect on the harsh working condition environment of a hypersonic weapon radome.

Description

Technical Field

[0001] This invention relates to the technical field of heat insulation structural components for the connection area of ​​high Mach radar radomes, and specifically to a heat insulation structural component for the connection area of ​​an radome and its molding method. Background Technology

[0002] In recent years, with the rapid development of hypersonic weapons and the overall requirements for precision guidance, the materials used in radar radomes, which play a role in wave transmission, heat insulation, and load-bearing, are incompatible with technical and tactical specifications, limiting the development of hypersonic weapons. In particular, the connection area between the radome and the module, the connection between the metal structure and the ceramic material of the radome, and the severe friction between the radar seeker and the atmosphere during long-term, high-speed flight generate significant aerodynamic heat. The adhesives used to connect the metal and ceramic materials fail at around 300°C, making it difficult to ensure a proper connection between the radome and the seeker's rear module. Especially under harsh conditions such as supersonic and hypersonic flight, long-term operation, extremely high temperatures, and large overloads, serious problems such as debonding between the radome and the rear module exist. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the above-mentioned technologies by providing a heat insulation structure for the antenna radome connection area and its molding method, which effectively ensures the temperature of the connection area and has a significant cooling effect on the harsh working environment of hypersonic weapon antenna radomes.

[0004] To achieve the above objectives, the radome connection area heat insulation structure designed in this invention includes, in sequence, an outer heat insulation layer, a ceramic layer, a metal layer, and a heat storage layer. The outer heat insulation layer is a quartz fiber reinforced low-density phenolic resin composite material, the ceramic layer is a quartz fiber reinforced quartz composite ceramic, the metal layer is a low-expansion alloy steel, and the inner layer of the heat storage layer is an inorganic salt phase change material, with an outer layer covered by a copper foil layer.

[0005] Preferably, the thermal conductivity of the outer insulation layer is ≤0.08 W / (mK) (RT, 200℃), the tensile strength of the ceramic layer is ≥60 MPa (room temperature), and the average linear expansion coefficient of the metal layer is ≤2.0 × 10⁻⁶. -6 At / ℃, the heat storage capacity of the inorganic salt phase change material is 6-10 (J / cm²). 3 K), with a density of 2.0–2.5 g / cm³. 3 The thickness of the copper foil layer is 0.5 to 0.8 mm, and the thermal conductivity is 60 to 100 (W / (m·K)).

[0006] Preferably, the heat storage layer and the metal layer are connected by screws.

[0007] A method for molding the heat insulation structure of the antenna radome connection area includes the following steps:

[0008] A) Prepare quartz fiber reinforced quartz composite ceramics to form a ceramic layer;

[0009] B) Using the end face of quartz fiber reinforced quartz composite ceramic as the base surface, place the completed woven low-density quartz needle-punched felt on the base surface and put it into the mold.

[0010] C) Inject low-density phenolic resin into the mold to fill it with low-density quartz needle-punched felt, then cure and process it to complete the connection between quartz fiber reinforced quartz composite ceramic and low-density phenolic resin, forming an external heat insulation layer.

[0011] D) Perform ultrasonic testing on the contact surface between quartz fiber reinforced quartz composite ceramic and low-density phenolic resin to determine whether debonding has occurred.

[0012] E) Low-expansion alloy steel and quartz fiber reinforced quartz composite ceramic are bonded and cured using epoxy hybrid adhesive to form a metal layer;

[0013] F) Inorganic salt phase change material is injected through pre-reserved pores. After quantitative injection, the pores are sealed by brazing to form a heat storage layer.

[0014] G) The heat storage layer and the metal layer are connected by screws to form a heat insulation structure for the antenna radome connection area with excellent heat insulation and structural strength.

[0015] Preferably, in step C), the quartz needle-punched reinforcement in the quartz fiber-reinforced low-density phenolic resin composite material of the outer heat insulation layer is a low-density fabric with a density of 0.3–0.6 g / cm³. 3 The density of the composite material after molding is 0.7 to 0.9 g / cm3.

[0016] Preferably, in step C), the low-density phenolic resin is RTM molded, cured at a temperature of 120-150°C, and held for 6 hours.

[0017] Preferably, in step E), the curing temperature of the epoxy hybrid adhesive is 150℃ / 3h, the room temperature shear strength is 15~20MPa, and the 300℃ shear strength is 9~12MPa.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. It can prevent external heat from entering the radome and store the heat transferred to the adhesive, maintaining the normal use of the ceramic and metal adhesives, and reducing the ambient temperature at the seeker head to protect the adhesive from failure.

[0020] 2. The outer insulation layer composite material has low density, low thermal conductivity, and high strength, making it a typical lightweight and high-strength insulation material;

[0021] 3. The introduction of inorganic salt phase change materials into the thermal storage applications of radome ceramic and metal materials can significantly improve the working conditions of adhesives. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to specific embodiments.

[0023] A heat insulation structure for the radome connection area includes, in sequence, an outer heat insulation layer, a ceramic layer, a metal layer, and a heat storage layer. The outer heat insulation layer is a quartz fiber reinforced low-density phenolic resin composite material, the ceramic layer is a quartz fiber reinforced quartz composite ceramic, the metal layer is a low-expansion alloy steel, the inner layer of the heat storage layer is an inorganic salt phase change material, and the outer layer is covered with a copper foil layer.

[0024] The thermal conductivity of the external insulation layer is ≤0.08 W / (mK) (RT, 200℃), the tensile strength of the ceramic layer is ≥60 MPa (room temperature), and the average linear expansion coefficient of the metal layer is ≤2.0×10⁻⁶. -6 At ℃, the heat storage capacity of inorganic salt phase change materials is 6–10 (J / cm²). 3 K), with a density of 2.0–2.5 g / cm³. 3 The thickness of the copper foil layer is 0.5–0.8 mm, and the thermal conductivity is 60–100 (W / (m·K)).

[0025] In addition, the heat storage layer and the metal layer are connected by screws.

[0026] The following is a molding embodiment of the heat insulation structure component for the antenna radome connection area:

[0027] Example 1

[0028] A method for molding a heat insulation structure for the antenna radome connection area as described in claim 1 includes the following steps:

[0029] A) Prepare quartz fiber reinforced quartz composite ceramics to form a ceramic layer;

[0030] B) Using the end face of quartz fiber reinforced quartz composite ceramic as the base surface, place the completed woven low-density quartz needle-punched felt on the base surface and put it into the mold.

[0031] C) Low-density phenolic resin is injected into a mold to fill it with low-density quartz needle-punched felt, then cured and processed to complete the connection between the quartz fiber-reinforced quartz composite ceramic and the low-density phenolic resin, forming an external heat insulation layer. In this external heat insulation layer, the quartz needle-punched reinforcement in the quartz fiber-reinforced low-density phenolic resin composite material is a low-density fabric with a density of 0.3 g / cm³. 3 The density of the composite material after molding is 0.7 g / cm³. 3 The low-density phenolic resin is RTM molded, with a curing temperature of 120℃ and a holding time of 6 hours.

[0032] D) Perform ultrasonic testing on the contact surface between quartz fiber reinforced quartz composite ceramic and low-density phenolic resin to determine whether debonding has occurred.

[0033] E) Low-expansion alloy steel and quartz fiber reinforced quartz composite ceramic are bonded and cured using epoxy hybrid adhesive to form a metal layer. The curing temperature of the epoxy hybrid adhesive is 150℃ / 3h, the room temperature shear strength is 15~20MPa, and the 300℃ shear strength is 9~12MPa.

[0034] F) Inorganic salt phase change material is injected through pre-reserved pores. After quantitative injection, the pores are sealed by brazing to form a heat storage layer.

[0035] G) The heat storage layer and the metal layer are connected by screws to form a heat insulation structure for the antenna radome connection area with excellent heat insulation and structural strength.

[0036] Example 2

[0037] A method for molding a heat insulation structure for the antenna radome connection area as described in claim 1 includes the following steps:

[0038] A) Prepare quartz fiber reinforced quartz composite ceramics to form a ceramic layer;

[0039] B) Using the end face of quartz fiber reinforced quartz composite ceramic as the base surface, place the completed woven low-density quartz needle-punched felt on the base surface and put it into the mold.

[0040] C) Low-density phenolic resin is injected into a mold to fill it with low-density quartz needle-punched felt, then cured and processed to complete the connection between the quartz fiber-reinforced quartz composite ceramic and the low-density phenolic resin, forming an external heat insulation layer. In this external heat insulation layer, the quartz needle-punched reinforcement in the quartz fiber-reinforced low-density phenolic resin composite material is a low-density fabric with a density of 0.6 g / cm³. 3 The density of the composite material after molding is 0.9 g / cm³. 3 The low-density phenolic resin is RTM molded, with a curing temperature of 150℃ and a holding time of 6 hours.

[0041] D) Perform ultrasonic testing on the contact surface between quartz fiber reinforced quartz composite ceramic and low-density phenolic resin to determine whether debonding has occurred.

[0042] E) Low-expansion alloy steel and quartz fiber reinforced quartz composite ceramic are bonded and cured using epoxy hybrid adhesive to form a metal layer. The curing temperature of the epoxy hybrid adhesive is 150℃ / 3h, the room temperature shear strength is 15~20MPa, and the 300℃ shear strength is 9~12MPa.

[0043] F) Inorganic salt phase change material is injected through pre-reserved pores. After quantitative injection, the pores are sealed by brazing to form a heat storage layer.

[0044] G) The heat storage layer and the metal layer are connected by screws to form a heat insulation structure for the antenna radome connection area with excellent heat insulation and structural strength.

[0045] Example 3

[0046] A method for molding a heat insulation structure for the antenna radome connection area as described in claim 1 includes the following steps:

[0047] A) Prepare quartz fiber reinforced quartz composite ceramics to form a ceramic layer;

[0048] B) Using the end face of quartz fiber reinforced quartz composite ceramic as the base surface, place the completed woven low-density quartz needle-punched felt on the base surface and put it into the mold.

[0049] C) Low-density phenolic resin is injected into a mold to fill it with low-density quartz needle-punched felt, then cured and processed to complete the connection between the quartz fiber-reinforced quartz composite ceramic and the low-density phenolic resin, forming an external heat insulation layer. In this external heat insulation layer, the quartz needle-punched reinforcement in the quartz fiber-reinforced low-density phenolic resin composite material is a low-density fabric with a density of 0.5 g / cm³. 3 The density of the composite material after molding is 0.8 g / cm³. 3 The low-density phenolic resin is RTM molded, with a curing temperature of 140℃ and a holding time of 6 hours.

[0050] D) Perform ultrasonic testing on the contact surface between quartz fiber reinforced quartz composite ceramic and low-density phenolic resin to determine whether debonding has occurred.

[0051] E) Low-expansion alloy steel and quartz fiber reinforced quartz composite ceramic are bonded and cured using epoxy hybrid adhesive to form a metal layer. The curing temperature of the epoxy hybrid adhesive is 150℃ / 3h, the room temperature shear strength is 15~20MPa, and the 300℃ shear strength is 9~12MPa.

[0052] F) Inorganic salt phase change material is injected through pre-reserved pores. After quantitative injection, the pores are sealed by brazing to form a heat storage layer.

[0053] G) The heat storage layer and the metal layer are connected by screws to form a heat insulation structure for the antenna radome connection area with excellent heat insulation and structural strength.

[0054] The radome connection area heat insulation structure obtained in Examples 1-3 was subjected to a combined thermal test at a maximum temperature of 1100℃ for 1100 seconds. The heat insulation layer of the radome connection area heat insulation structure was heated by a quartz lamp. The temperature of its heat storage layer was ≤150℃, which is much lower than the temperature of ceramic and metal structural components of the same structural size. The temperature of the adhesive was below 300℃, ensuring that the bonding area of ​​the structural component did not fail.

[0055] When Examples 1-3 are applied in practice, under long-term environments with an external temperature of 700℃ to 900℃, the temperature at the adhesive can be reduced to below 300℃, ensuring the normal use of the adhesive. Compared with the quartz ceramic + metal layer solution, the temperature at the adhesive can be reduced by more than 150℃, exhibiting excellent heat insulation and heat storage performance.

[0056] The present invention relates to a heat insulation structure for the antenna radome connection area and its molding method, which can prevent external heat from entering the antenna radome and store the heat transferred to the adhesive, maintaining the normal use of the ceramic and metal adhesives, and reducing the ambient temperature at the seeker head to protect the adhesive from failure. The outer heat insulation layer composite material has low density, low thermal conductivity, and high strength, making it a typical lightweight and high-strength heat insulation material. The introduction of inorganic salt phase change materials into the heat storage application of the ceramic and metal materials of the antenna radome can significantly improve the working conditions of the adhesive.

Claims

1. A heat insulation structure for the antenna radome connection area, characterized in that: The system comprises, in sequence, an external insulation layer, a ceramic layer, a metal layer, and a heat storage layer. The external insulation layer is a quartz fiber-reinforced low-density phenolic resin composite material; the ceramic layer is a quartz fiber-reinforced quartz composite ceramic; the metal layer is a low-expansion alloy steel; the inner layer of the heat storage layer is an inorganic salt phase change material, and the outer layer is covered with a copper foil layer. The thermal conductivity of the external insulation layer is ≤0.08 W / (mK) at RT and 200℃. The tensile strength of the ceramic layer at room temperature is ≥60 MPa, and the average linear expansion coefficient of the metal layer is ≤2.0 × 10⁻⁶. -6 At / ℃, the thermal storage capacity of the inorganic salt phase change material is 6~10 J / cm². 3 K, density is 2.0~2.5g / cm³ 3 The copper foil layer has a thickness of 0.5–0.8 mm and a thermal conductivity of 60–100 W / (m·K).

2. The radome connection area heat insulation structure according to claim 1, characterized in that: The heat storage layer and the metal layer are connected by screws.

3. A method for forming a heat insulation structure for the antenna radome connection area as described in claim 1, characterized in that: Includes the following steps: A) Preparation of quartz fiber reinforced quartz composite ceramic to form a ceramic layer; B) Using the end face of quartz fiber reinforced quartz composite ceramic as the base surface, place the completed woven low-density quartz needle-punched felt on the base surface and put it into the mold. C) Inject low-density phenolic resin into the mold to fill it with low-density quartz needle-punched felt, then cure and process it to complete the connection between quartz fiber reinforced quartz composite ceramic and low-density phenolic resin, forming an external heat insulation layer. D) Perform ultrasonic testing on the contact surface between quartz fiber reinforced quartz composite ceramic and low-density phenolic resin to determine whether debonding has occurred. E) Low-expansion alloy steel and quartz fiber reinforced quartz composite ceramic are bonded and cured using epoxy hybrid adhesive to form a metal layer; F) Inorganic salt phase change material is injected through pre-reserved pores. After quantitative injection, the pores are sealed by brazing to form a heat storage layer. G) The heat storage layer and the metal layer are connected by screws to form a heat insulation structure for the antenna radome connection area with excellent heat insulation and structural strength.

4. The molding method of the heat insulation structure component of the antenna radome connection area according to claim 3, characterized in that: In step C), the quartz needle-punched reinforcement in the quartz fiber-reinforced low-density phenolic resin composite material of the outer insulation layer is a low-density fabric with a density of 0.3–0.6 g / cm³. 3 The density of the composite material after molding is 0.7–0.9 g / cm³. 3 .

5. The molding method of the heat insulation structure component of the antenna radome connection area according to claim 3, characterized in that: In step C), the low-density phenolic resin is RTM molded, cured at a temperature of 120-150ºC, and held for 6 hours.

6. The molding method of the heat insulation structure component of the antenna radome connection area according to claim 3, characterized in that: In step E), the curing temperature of the epoxy hybrid adhesive is 150ºC / 3h, the room temperature shear strength is 15~20MPa, and the 300ºC shear strength is 9~12MPa.