Metal ceramic integrated fastener

Abstract

The utility model discloses a metal ceramic integrated fastener, relates to the technical field of fasteners, and can solve the problem that an existing fastener is not suitable for a complex application environment. The metal ceramic integrated fastener comprises a fastener body, and the fastener body comprises a metal section and a ceramic-based composite material section which are integrally and fixedly connected.

Description

TECHNICAL FIELD

[0001] The utility model relates to fastener technical field, concretely relates to a metal ceramic integrated fastener. BACKGROUND

[0002] At present, ceramic matrix composites are widely used in aerospace field because of their excellent high-temperature resistance, oxidation resistance and lightweight characteristics. They are used to manufacture engine components, thermal protection systems and structural assemblies, which can maintain stability and strength in extreme environments. In addition, ceramic matrix composites also have good corrosion resistance, which can effectively prolong the service life of warplanes and spacecraft and improve flight safety and performance. Therefore, ceramic matrix composites have become one of the important materials to promote the development of aerospace technology.

[0003] The structure of an aero-engine is relatively complex, mainly composed of five parts: an air inlet device, a compressor, a combustion chamber, a turbine and an exhaust device. Among them, the air inlet device and the compressor are cold end components, and the combustion chamber, the turbine and the exhaust device are hot end components.

[0004] The aero-engine is the heart of an aircraft, and its component performance requirements are extremely high. Especially the connecting parts of the cold end components and the hot end components, which require both high temperature resistance and high strength. The metal fasteners used in traditional aero-engines are prone to swelling deformation, fatigue cracking and other problems in high temperature environment, which is not conducive to long-term stable operation, and the machinability of the ceramic matrix composite alone is not good.

[0005] Based on the above background, the inventor specially designs a metal ceramic integrated fastener to solve the problem that the existing fastener is not suitable for complex application environment. CONTENT OF THE UTILITY MODEL

[0006] The purpose of the present application is to provide a metal ceramic integrated fastener to solve the problem that the existing fastener is not suitable for complex application environment.

[0007] To solve the above technical problems, the utility model adopts the following scheme:

[0008] The present application provides a metal ceramic integrated fastener, which comprises a fastener body, the fastener body comprising a metal segment and a ceramic matrix composite segment fixedly connected in one piece.

[0009] Optionally, the fastener further comprises a solder segment between the metal segment and the ceramic matrix composite segment, and the metal segment and the ceramic matrix composite segment are welded and fixed into one piece through the solder segment.

[0010] Optionally, the metal segment is provided with a thread part exposed on its surface.

[0011] The ceramic matrix composite segment is provided with a bolt head.

[0012] Optionally, the surface of the threaded portion is coated with a molybdenum disulfide coating.

[0013] Optionally, the thickness of the molybdenum disulfide coating ranges from 0.005 mm to 0.015 mm.

[0014] Optionally, the end faces of the metal segment and the ceramic matrix composite segment that are close to each other are planar or are mutually adapted concave and convex curved surfaces.

[0015] Optionally, the end faces of the metal segment and the ceramic matrix composite segment that are close to each other are distributed with a plurality of convex points or / and concave pits.

[0016] Optionally, the end of the ceramic matrix composite segment close to the metal segment is provided with a groove, and the end of the metal segment close to the ceramic matrix composite segment is provided with a protrusion located in the groove.

[0017] Optionally, the groove and the protrusion each have a plurality of edges parallel to the axis of the metal segment or the ceramic matrix composite segment.

[0018] Optionally, the metal segment and the ceramic matrix composite segment are fixedly connected by adhesive bonding.

[0019] The beneficial effects of the utility model are as follows:

[0020] First, the ceramic matrix composite segment and the metal segment are integrally fixedly connected, so that the metal segment in the fastener can be responsible for the connection of components in the cold end region and provide good thread processability, the ceramic matrix composite segment can be responsible for the connection of components in the hot end region, so that the fastener of the application can adapt to special environments with close distance but large temperature difference.

[0021] Second, the application can also reduce the overall weight, improve the engine efficiency, and meet the high performance requirements of the aero-engine, thereby providing a new technical solution for the connection of hot end components and cold end components of the aero-engine. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of embodiment 1 of the application.

[0023] Figure 2 is a schematic diagram of the cross-sectional structure of embodiment 1 of the application.

[0024] Figure 3 is a schematic diagram of the cross-sectional structure of embodiment 2 of the application.

[0025] Figure 4 is a schematic diagram of the cross-sectional structure of embodiment 3 of the application.

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 1 - fastener body, 11 - metal segment, 111 - threaded portion, 112 - groove, 12 - ceramic matrix composite segment, 121 - bolt head, 122 - protrusion, 13 - solder segment. DETAILED DESCRIPTION

[0028] The utility model will be described in further detail below in conjunction with the embodiments and drawings, but the embodiments of the utility model are not limited thereto.

[0029] In the description of the utility model, it needs to be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "back", "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "open", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0031] The utility model will be described in further detail below in conjunction with the embodiments and drawings, but the embodiments of the utility model are not limited thereto.

[0032] Embodiment 1

[0033] As shown in Figure 1 and Figure 2 The embodiment provides a metal-ceramic integrated fastener, which comprises a fastener body 1, and the fastener body 1 comprises a metal segment 11 and a ceramic matrix composite segment 12 which are integrally and fixedly connected.

[0034] The embodiment integrally and fixedly connects the ceramic matrix composite segment 12 and the metal segment 11, so that the metal segment 11 in the fastener can be responsible for the connection of components in the cold end region and provide good thread processability, and the ceramic matrix composite segment 12 can be responsible for the connection of components in the hot end region, so that the fastener of the utility model can adapt to special environments with close distance but large temperature difference.

[0035] The embodiment can also reduce the overall weight, improve engine efficiency and meet the high performance requirements of an aero-engine compared with a conventional fastener, and provides a new technical solution for the connection of hot end components and cold end components of an aero-engine.

[0036] Specifically, in the embodiment, as shown in Figure 1 and Figure 2 , the fastener further comprises a solder segment 13 between the metal segment 11 and the ceramic matrix composite segment 12, and the metal segment 11 and the ceramic matrix composite segment 12 are welded and fixed as a whole through the solder segment 13. The material of the ceramic matrix composite segment 12 in the embodiment is silicon carbide ceramic, which is a conventional existing material. The solder used in the solder segment 13 in the embodiment is a special solder disclosed in the patent with the patent application number CN202210024471.0 and the patent name of a soldering agent for connecting silicon carbide ceramic and a preparation method thereof, which ensures the stability of the metal and ceramic after welding.

[0037] Specifically, in the embodiment, as shown in Figure 1 and Figure 2 , the metal segment 11 is provided with a threaded portion 111 exposed on the surface thereof;

[0038] The ceramic matrix composite segment 12 is provided with a bolt head 121, and the threaded portion 111 is formed by machining threads on the metal segment 11 using existing numerical control machine tools.

[0039] Specifically, in the embodiment, the surface of the threaded portion 111 is coated with a molybdenum disulfide coating.

[0040] Specifically, in the embodiment, the thickness of the molybdenum disulfide coating ranges from 0.005mm to 0.015mm. In the embodiment, the thickness of the molybdenum disulfide coating is about 0.01mm. The technician can set the molybdenum disulfide coating with other thickness according to the needs.

[0041] Specifically, in the embodiment, the end faces of the metal segment 11 and the ceramic matrix composite segment 12 close to each other are circular planes.

[0042] Specifically, in the embodiment, the size of the threaded portion 111111 is M16, and the technician can set the size of the threaded portion 111111 and the fastener to other sizes according to the needs to adapt to different connecting holes.

[0043] Specifically, in the embodiment, the end faces of the metal segment 11 and the ceramic matrix composite segment 12 close to each other are circular planes.

[0044] Example 2:

[0045] like Figure 3 As shown, in this embodiment, the end faces of the metal segment 11 and the ceramic matrix composite segment 12 that are close to each other are corresponding concave and convex curved surfaces. In this embodiment, the end face of the metal segment 11 close to the ceramic matrix composite segment 12 is a convex curved surface, while the end face of the ceramic matrix composite segment 12 close to the metal segment 11 is a concave curved surface. Those skilled in the art can, as needed, set the end face of the metal segment 11 to a concave curved surface and the end face of the ceramic matrix composite segment 12 to a convex curved surface.

[0046] The remaining structures in this embodiment are the same as those in Embodiment 1 above, and will not be described again here.

[0047] Example 3:

[0048] like Figure 4 As shown, in this embodiment, the ceramic matrix composite segment 12 is provided with a groove 112 at one end near the metal segment 11, and the metal segment 11 is provided with a protrusion 122 located in the groove 112 at one end near the ceramic matrix composite segment 12.

[0049] Specifically, in this embodiment, both the groove 112 and the protrusion 122 have several edges parallel to the axis of the metal segment 11 or the ceramic matrix composite segment 12.

[0050] In this embodiment, the end faces of the groove 112 and the protrusion 122 are both rectangular. Those skilled in the art can also set them to triangular, pentagonal, hexagonal, semi-circular, or other shapes, which will not be elaborated here.

[0051] The remaining structures in this embodiment are the same as those in Embodiment 1 above, and will not be described again here.

[0052] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A metal-ceramic integrated fastener, comprising a fastener body (1), characterized in that, The fastener body (1) includes an integrally fixed metal segment (11) and a ceramic matrix composite segment (12).

2. The metal-ceramic integrated fastener according to claim 1, characterized in that, The fastener also includes a solder section (13) located between the metal section (11) and the ceramic matrix composite section (12), and the metal section (11) and the ceramic matrix composite section (12) are welded and fixed together by the solder section (13).

3. The metal-ceramic integrated fastener according to claim 2, characterized in that, The metal segment (11) is provided with a threaded portion (111) exposed on its surface; The ceramic-based composite section (12) is provided with a bolt head (121).

4. The metal-ceramic integrated fastener according to claim 3, characterized in that, The surface of the threaded portion (111) is coated with a molybdenum disulfide coating.

5. The metal-ceramic integrated fastener according to claim 4, characterized in that, The thickness of the molybdenum disulfide coating ranges from 0.005 mm to 0.015 mm.

6. The metal-ceramic integrated fastener according to claim 2, characterized in that, The end faces of the metal segment (11) and the ceramic matrix composite segment (12) that are close to each other are either flat or mutually compatible concave and convex curved surfaces.

7. A metal-ceramic integrated fastener according to claim 6, characterized in that, Several protrusions and / or pits are distributed on the end faces of the metal segment (11) and the ceramic matrix composite segment (12) that are close to each other.

8. A metal-ceramic integrated fastener according to claim 2, characterized in that, The ceramic-based composite section (12) has a groove (112) at one end near the metal section (11), and the metal section (11) has a protrusion (122) located in the groove (112) at one end near the ceramic-based composite section (12).

9. A metal-ceramic integrated fastener according to claim 8, characterized in that, Both the groove (112) and the protrusion (122) have several edges parallel to the axis of the metal segment (11) or the ceramic matrix composite segment (12).

10. A metal-ceramic integrated fastener according to claim 1, characterized in that, The metal segment (11) and the ceramic matrix composite segment (12) are fixedly connected by adhesive.

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