Polycrystalline alumina high-temperature liner tube with multi-layer composite structure
The high-temperature polycrystalline alumina liner with a multi-layer composite structure design solves the problems of easy cracking and crack propagation under high temperature environment, achieves stable connection and improved thermal insulation performance, extends service life and reduces manufacturing cost.
Patent Information
- Application Number
- CN202520819809.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-27
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-04-27
AI Technical Summary
Polycrystalline alumina high-temperature lining tubes are prone to cracking and crack propagation under high-temperature environments, have a short service life, and have complex manufacturing processes, high costs, and generally poor thermal insulation performance.
The design employs a multi-layer composite structure, including a polycrystalline alumina main layer, a transition layer, and a connecting layer. The outer side of the transition layer is provided with a fiber layer and stepped teeth, and the connecting layer is provided with surface holes for installing metal rivets, which simplifies the installation process and enhances the connection stability.
It improves the connection stability and thermal insulation performance of polycrystalline alumina high-temperature liner tubes, extends service life, reduces manufacturing costs, and avoids crack propagation caused by mechanical extrusion.
Smart Images
Figure CN223948747U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of polycrystalline alumina high temperature lining pipe of multilayer composite structure belongs to the connecting pipe equipment technical field of high-temperature industrial equipment. BACKGROUND
[0002] Alumina pipe is prepared by sintering with alumina as main body, with the characteristics of high hardness, high temperature resistance and light weight, and is widely used in high-temperature equipment and other fields, but the brittleness of alumina pipe is large, which will become a use defect in many scenes and limit the application range of alumina pipe.
[0003] The polycrystalline alumina pipe with fine and uniform polycrystalline structure obtained by optimizing grain boundary can improve the performance of the pipe under high temperature conditions, especially the maximum temperature of high temperature resistance can be greatly improved. It has been verified that the corrosion resistance and other pipe properties of polycrystalline alumina pipe are also better, but its shortcomings are also very obvious. First, the preparation process is relatively complex, and the production cost is greatly increased through gel injection molding and precise temperature control of static pressure furnace sintering. Secondly, its weight is also increased and the heat insulation performance is general. When used in high-temperature industrial fields such as crucible flow guide growth furnace and battery electrolyte pipe, it will be affected by the cold and hot cycle of the use environment and continuous use, resulting in shorter service life due to surface cracking and crack propagation.
[0004] In the above high-temperature industrial scene, high-temperature lining pipe is a commonly used functional lining component for protecting equipment or internal structure of pipe, which mainly plays the role of heat insulation and cold and hot cycle resistance. Therefore, further pursuit of the use performance of alumina pipe under high temperature environment is the continuous application demand in the industry. UTILITY MODEL CONTENTS
[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a polycrystalline alumina high temperature lining pipe with multilayer composite structure.
[0006] According to the embodiment of the utility model, the first scheme is provided: a polycrystalline alumina high temperature lining pipe with multilayer composite structure, comprising:
[0007] A polycrystalline alumina main pipe layer, the cross section of the polycrystalline alumina main pipe layer is circular or elliptical ring shape;
[0008] A transition layer is arranged outside the polycrystalline alumina main pipe layer;
[0009] A connecting layer is arranged outside the transition layer, and a surface hole is arranged at the connecting position of the connecting layer, and a metal rivet can be connected in the surface hole.
[0010] Further, a rough attachment surface is arranged outside the polycrystalline alumina main pipe layer.
[0011] Further, the transition layer outside the rough attachment surface comprises a stepped attachment layer, the stepped attachment layer comprises stepped teeth consistent with the axial direction of the polycrystalline alumina main pipe layer, and a plurality of stepped teeth are uniformly arranged outside the polycrystalline alumina main pipe layer, and a stepped groove is arranged between adjacent stepped teeth.
[0012] Further, the outside of the polycrystalline alumina main pipe layer comprises a working side and a connecting side, the transition layer is arranged on the connecting side, the transition layer comprises a stepped attachment layer, the stepped attachment layer comprises stepped teeth consistent with the axial direction of the polycrystalline alumina main pipe layer, and a plurality of stepped teeth are uniformly arranged, and a stepped groove is arranged between adjacent stepped teeth.
[0013] Further, the surface hole is arranged at a position corresponding to the stepped groove.
[0014] Further, the surface hole is arranged with an internal thread, and the metal rivet comprises a threaded connection part, a nut, and a connecting rod connected with the equipment, and the threaded connection part is arranged with external threads matched with the internal threads of the surface hole.
[0015] Further, the transition layer is a fiber layer or the transition layer comprises a fiber structure.
[0016] Further, the fiber layer is a single-layer or multi-layer fiber film wound outside the polycrystalline alumina main pipe layer.
[0017] Further, the fiber structure comprises dispersedly arranged fiber filaments or fiber bundles.
[0018] Further, the polycrystalline alumina main pipe layer is further coated with an aluminum oxynitride coating.
[0019] Compared with the prior art, the technical scheme provided by the present application has the beneficial effects of:
[0020] The present scheme provides a high-temperature lining pipe of polycrystalline alumina, a transition layer is arranged outside the polycrystalline alumina main pipe layer, the function of the transition layer is to wrap and connect the polycrystalline alumina main pipe layer, to functionally modify and enhance the heat insulation performance of the polycrystalline alumina main pipe layer, and to form an attachment surface on the outside, so that the arrangement of the connecting layer is more stable, and the heat insulation performance of the transition layer also protects the connecting layer, the connecting layer can be used to arrange a surface hole and install a metal rivet, so that the metal rivet is directly arranged on the polycrystalline alumina high-temperature lining pipe of the multi-layer composite structure, simplifying the installation process and installation structure, while improving the stability of the connecting part, the metal rivet is connected with the connecting layer to avoid direct mechanical extrusion deformation of the metal rivet on the polycrystalline alumina main pipe layer and cause cracks or crack propagation. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings described below are only some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.
[0022] In which:
[0023] Figure 1 It is a schematic diagram of the main cross section of the polycrystalline alumina high-temperature lining pipe with a multi-layer composite structure in an embodiment.
[0024] Figure 2 It is a schematic diagram of the main cross section of the polycrystalline alumina high-temperature lining pipe with a multi-layer composite structure in an embodiment.
[0025] Figure 3 It is a schematic diagram of the layer structure of the polycrystalline alumina high-temperature lining pipe with a multi-layer composite structure in an embodiment.
[0026] Figure 4 It is a schematic diagram of the rough attachment surface of the polycrystalline alumina main pipe layer of the polycrystalline alumina high-temperature lining pipe with a multi-layer composite structure in an embodiment.
[0027] Figure 5 It is a schematic diagram of the transition layer arranged at the connecting side of the polycrystalline alumina high-temperature lining pipe with a multi-layer composite structure in an embodiment.
[0028] Reference signs:
[0029] 10-polycrystalline alumina main pipe layer; 11-rough attachment surface; 20-transition layer; 21-step tooth; 22-step groove; 30-connecting layer; 40-metallic rivet. DETAILED DESCRIPTION
[0030] In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0031] EMBODIMENT
[0032] The embodiment provides a polycrystalline alumina high-temperature lining pipe with a multilayer composite structure, which is a functional component of a protective device or an internal structure of a pipeline applied to a high-temperature environment, and is widely used under high-temperature conditions. Currently, the polycrystalline alumina high-temperature lining pipe has defects in use, including that the service life needs to be improved, and surface cracking occurs when the service environment is subjected to cold and hot cycles, especially at a position connected with the outside, and crack propagation easily occurs to cause the service life to be shortened.
[0033] To solve the technical problem, the embodiment provides an improved polycrystalline alumina high-temperature lining pipe with a multilayer composite structure, as shown in Figure 1 、 Figure 3 which comprises a polycrystalline alumina main pipe layer 10, the polycrystalline alumina main pipe layer 10 is circular or elliptical in cross section; a transition layer 20 arranged outside the polycrystalline alumina main pipe layer 10; a connecting layer 30 arranged outside the transition layer 20, the connecting layer 30 is provided with a surface hole at a connecting position, and a metal rivet 40 can be connected in the surface hole.
[0034] Coating a functional layer outside the polycrystalline alumina main pipe layer 10 is a technical improvement direction for improving the high-temperature performance of the high-temperature lining pipe. In the embodiment, the transition layer 20 is arranged outside the polycrystalline alumina main pipe layer 10. The transition layer 20 has the following effects: wrapping and connecting the polycrystalline alumina main pipe layer 10, modifying the function of the polycrystalline alumina main pipe layer 10 and enhancing the heat insulation performance, forming an attachment surface outside, making the arrangement of the connecting layer 30 more stable, and the heat insulation performance of the transition layer 20 also protects the connecting layer 30. The connecting layer 30 can be used to arrange a surface hole and install a metal rivet 40, so that the metal rivet 40 is directly arranged on the polycrystalline alumina high-temperature lining pipe with a multilayer composite structure, simplifying the installation process and installation structure, improving the stability of the connecting part, and avoiding the direct mechanical extrusion deformation of the metal rivet 40 on the polycrystalline alumina main pipe layer 10 and causing cracks or crack propagation.
[0035] Specifically, in order to improve the connection stability of the transition layer 20 and simplify the preparation process, as shown in Figure 4 a rough attachment surface 11 is arranged outside the polycrystalline alumina main pipe layer 10.
[0036] Further, as shown in Figure 2 the transition layer 20 outside the rough attachment surface 11 comprises a stepped attachment layer, the stepped attachment layer comprises stepped teeth 21 consistent with the axial direction of the polycrystalline alumina main pipe layer 10, a plurality of stepped teeth 21 are uniformly arranged outside the polycrystalline alumina main pipe layer 10, and stepped grooves 22 are arranged between adjacent stepped teeth 21.
[0037] The setting mode of the stepped teeth 21 and the stepped grooves 22 is the core invention point of the case, and the wave-shaped appearance of the stepped teeth 21 and the stepped grooves 22 can increase the connecting surface of the transition layer 20 and the connecting layer 30. In particular, the connecting layer 30 is used for setting the metal rivet 40, the metal rivet 40 has a certain connecting depth, and therefore the thickness of the connecting layer 30 needs to be set to be relatively thick. The stepped groove 22 can provide a deep space for installing the metal rivet 40, and the connecting layer 30 as a whole can be set to be relatively thin, and the connecting surface between the connecting layer 30 and the transition layer 20 is not reduced, and has the advantages of simple structure, firm connection, stable setting of the metal rivet 40, and light and thin overall device structure.
[0038] In another implementation method, the polycrystalline alumina main pipe layer 10 includes a working side and a connecting side, as shown in the figure, the transition layer 20 is arranged on the connecting side, and the transition layer 20 includes a stepped attachment layer, the stepped attachment layer includes stepped teeth 21 consistent with the axial direction of the polycrystalline alumina main pipe layer 10, a plurality of stepped teeth 21 are uniformly arranged, and stepped grooves 22 are arranged between adjacent stepped teeth 21. Generally, the connecting side and the working side can each be set to 50%, the transition layer 20 is arranged on the connecting side, and only the connecting layer 30 is arranged on the working side. Figure 5
[0039] Specifically, the surface hole is arranged at a position corresponding to the stepped groove 22. The surface hole is internally provided with an internal thread, and the metal rivet 40 includes a threaded connecting portion, a nut, and a connecting rod connected with equipment, and the threaded connecting portion is provided with an external thread matched with the internal thread of the surface hole.
[0040] In terms of material structure, the transition layer 20 is a fiber layer or includes a fiber structure. The fiber layer is a single-layer or multi-layer fiber film wound on the outer side of the polycrystalline alumina main pipe layer 10. Alternatively, the fiber structure includes dispersedly arranged fiber filaments or fiber bundles.
[0041] Further, the polycrystalline alumina main pipe layer 10 is further coated with an aluminum oxynitride coating. The aluminum oxynitride coating can maintain the self-cleaning function of the polycrystalline alumina main pipe layer 10, and can further improve the performance of the high-temperature liner pipe.
[0042] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not conflict, they should be considered within the scope of the present disclosure. The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be considered as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application.
[0043] It should be noted that when an element is referred to as being "fixed" or "attached" to another element, it can be directly on the other element or indirectly on the other element by being attached to a third element. It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and the like as can be used herein, merely describe orientations in relation to the application as illustrated in the drawings and are not intended to denote or imply necessary or conventional positional relationships between the herein described structures. The terms "first", "second", and the like, do not denote any order, quantity, combination or important / primary use, but rather are used to nomenclature different components.
[0044] In addition, the terms "first", "second", and the like, merely denote "different" entities or "different" characteristics, and do not denote any order, quantity, combination or important / primary use, and should not be construed as limiting the application. The terms "plurality" and "a plurality" mean two or more, unless expressly specified otherwise. The terms "another", "additional" and the like, mean at least one, unless clearly indicated otherwise.
[0045] It should be understood that the structures, proportions, sizes, etc. shown in the drawings are only used to assist in understanding the present application, and are not intended to limit the scope of the application. Any modification, change or adjustment of the structures, proportions, sizes, etc. should still fall within the scope of the application.
Claims
1. A polycrystalline alumina high temperature liner tube of a multilayer composite structure, characterized in that, The application relates to a polycrystalline alumina main pipe layer, a transition layer and a connecting layer. The polycrystalline alumina main pipe layer is circular or elliptical in cross section. The transition layer is arranged outside the polycrystalline alumina main pipe layer. The connecting layer is arranged outside the transition layer and is provided with surface holes at the connecting position.
2. The polycrystalline alumina high temperature liner tube of the multi-layer composite structure of claim 1, wherein, The polycrystalline alumina main pipe layer is provided with a rough attachment surface outside.
3. The polycrystalline alumina high temperature liner tube of the multi-layer composite structure of claim 2, wherein, The transition layer outside the rough attachment surface comprises a stepped attachment layer which comprises stepped teeth in the axial direction of the polycrystalline alumina main pipe layer.
4. The polycrystalline alumina high temperature liner tube of the multi-layer composite structure of claim 1, wherein, The polycrystalline alumina main pipe layer comprises a working side and a connecting side.
5. The polycrystalline alumina high-temperature liner tube of a multi-layer composite structure according to claim 3 or 4, characterized in that, The transition layer is arranged on the connecting side.
6. The polycrystalline alumina high temperature liner tube of the multi-layer composite structure of claim 1, wherein, The transition layer comprises a stepped attachment layer which comprises stepped teeth in the axial direction of the polycrystalline alumina main pipe layer.
7. The polycrystalline alumina high temperature liner tube of the multi-layer composite structure of claim 1, wherein, The surface holes are arranged on the surface positions corresponding to the stepped grooves.
8. The polycrystalline alumina high temperature liner tube of the multi-layer composite structure of claim 7, wherein, The surface holes are provided with internal threads.
9. The polycrystalline alumina high temperature liner tube of the multi-layer composite structure of claim 7, wherein, The metal rivet comprises a threaded connecting part, a nut and a connecting rod connected with equipment.
10. The polycrystalline alumina high temperature liner tube of the multi-layer composite structure of claim 1, wherein, The threaded connecting part is provided with external threads matched with the internal threads of the surface holes. The transition layer is a fiber layer or comprises a fiber structure. The fiber layer is a single-layer or multi-layer fiber film wound outside the polycrystalline alumina main pipe layer. The fiber structure comprises dispersed fiber filaments or fiber bundles. The polycrystalline alumina main pipe layer is further coated with an aluminum oxynitride coating.