Preparation method of porous structure Invar alloy connecting ring based on hybrid additive manufacturing

Abstract

The present invention discloses a method for preparing a porous structure Invar alloy connecting ring based on hybrid additive manufacturing, comprising: obtaining the composition parameters of the connecting ring material based on the first principle, and the composition parameters of the connecting ring material include the composition and its weight percentage; obtaining the aperture parameters of the connecting ring based on the composition parameters of the connecting ring material and the non-local density functional theory; and preparing the connecting ring using a 3D printing process according to the composition parameters and aperture parameters of the connecting ring material. The present invention uses a 3D printing process to prepare the connecting ring, which can solve the transferability of the Invar effect of the connecting ring of the microwave optoelectronic head cover under the action of complex thermal history and its key measurement control problems, and finally realizes the lightweight design and manufacturing of the Invar alloy connecting ring and the ultrafast laser welding and sealing for the optoelectronic head cover, forming a microwave optoelectronic head cover connecting ring design and hybrid additive manufacturing method for rapid verification of a small number of parts and rapid production of components.

Description

Technical Field

[0001] The present invention relates to the technical field of Invar alloys, and in particular to a method for preparing a porous Invar alloy connecting ring for a microwave optoelectronic head cover based on hybrid additive manufacturing. Background Art

[0002] Ceramic materials are important dielectric and structural materials, and they play an important role in all aspects of precision machinery. For wireless optoelectronic equipment systems, as the system operating frequency and working environment continue to develop towards high performance and harshness, in order to obtain a wider working condition for ceramic / metal heterogeneous material system components, higher requirements are placed on the sealing and use of microwave optoelectronic head cover ceramics.

[0003] The microwave optoelectronic head cover is sealed with an Invar alloy connecting ring. The preparation of traditional Invar alloy connecting rings requires material smelting, forging, machining and welding, which has defects such as long process and low quality. When faced with the higher connection performance requirements of new products, the traditional technical system cannot solve the problem of the sharp decline of key characteristics such as expansion performance and mechanical properties under the action of multi-process thermal history. At the same time, the density of Invar alloy is relatively high, which is extremely bulky for high-precision wireless communication equipment. How to prepare Invar alloy connecting rings based on the idea of ​​hybrid additive manufacturing (i.e. 3D printing) to meet the higher connection performance requirements of new products has become a research hotspot. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing a porous structure Invar alloy connecting ring based on hybrid additive manufacturing. The connecting ring is prepared by 3D printing process, which can solve the transferability of the Invar effect of the material of the connecting ring of the microwave optoelectronic head cover under the action of complex thermal history and its key measurement control problem.

[0005] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0006] A method for preparing a porous structure Invar alloy connecting ring based on hybrid additive manufacturing, comprising:

[0007] Obtaining composition parameters of the connecting ring material based on first principles, wherein the composition parameters of the connecting ring material include composition and its weight percentage;

[0008] Obtaining the aperture parameters of the connecting ring based on the composition parameters of the connecting ring material and the non-localized density functional theory; and

[0009] The connecting ring is prepared by a 3D printing process according to the composition parameters and pore size parameters of the connecting ring material.

[0010] Optionally, the step of obtaining the composition parameters of the connecting ring material based on the first principles includes:

[0011] Density functional theory is used to establish the relationship between the temperature, composition parameters and organizational structure of the connecting ring material;

[0012] Modeling the structure of the connecting ring material using a Monte Carlo method to obtain a quasi-random structure of the connecting ring material;

[0013] A deep neural network algorithm is used to obtain the components in the connecting ring material with a quasi-random structure and the weight percentage of each component.

[0014] Optionally, the composition and weight percentage of the connecting ring material are: Fe: 32% to 36%, Ni: 60% to 64%, and component M to be added: balance.

[0015] Optionally, the component M to be added is Co.

[0016] Optionally, the step of obtaining the aperture parameters of the connecting ring includes:

[0017] According to the quasi-random structure and composition parameters of the connecting ring material, the pore size distribution of the micropores and mesopores in the connecting ring is obtained using the non-local density functional theory.

[0018] Optionally, the pore size of the micropores in the connecting ring is less than 2 nm, and the average pore size of the micropores is 1.5 nm, the pore size distribution range of the mesopores is 2 nm to 50 nm, and the average pore size of the mesopores is 30 nm.

[0019] Optionally, the step of preparing the connecting ring by using a 3D printing process includes:

[0020] preparing raw materials according to the composition parameters of the connecting ring material;

[0021] The raw materials are fused by a laser powder bed fusion process to obtain the connecting ring, and the connecting ring is a porous structure with micropores and mesopores;

[0022] According to the pore size distribution of the micropores and mesopores in the connecting ring, a laser beam is used to modify the pore size and hole shape of the connecting ring.

[0023] Optionally, the method for preparing a porous structure Invar alloy connecting ring based on hybrid additive manufacturing further includes: welding the connecting ring to the microwave optoelectronic head cover using a laser.

[0024] Compared with the prior art, the present invention has at least one of the following advantages:

[0025] The present invention provides a method for preparing a porous structure Invar alloy connecting ring based on hybrid additive manufacturing. The composition parameters of the connecting ring material can be obtained based on the first principles; the pore size parameters of the connecting ring can be obtained based on the composition parameters of the connecting ring material and the non-local density functional theory; the connecting ring can be prepared according to the composition parameters and pore size parameters of the connecting ring material and by adopting a 3D printing process.

[0026] When the present invention utilizes a 3D printing process (i.e., an additive manufacturing process) to prepare a connecting ring, the raw materials can be prepared and regulated based on precise temperature control, and the raw materials can be fused using a laser powder bed fusion process to obtain a connecting ring, i.e., a porous structure having micropores and mesopores, and a rapid laser beam is used to correct the pore size and hole shape of the macroscopic pores on the surface of the connecting ring, thereby quickly preparing the required connecting ring.

[0027] The present invention utilizes 3D printing technology to prepare the connecting ring, which can solve the problems of the transferability of the Invar effect of the material of the connecting ring of the microwave optoelectronic head cover under the action of complex thermal history and its key measurement control, and finally realizes the lightweight design and manufacturing of the Invar alloy connecting ring and the ultrafast laser welding and sealing for the optoelectronic head cover, forming a ceramic connecting ring design and hybrid additive manufacturing method for the microwave optoelectronic head cover for rapid verification of a small number of parts and rapid production of components.

[0028] The present invention can also be applied to the connection structure between components such as tank ceramic protective armor, aircraft ceramic head cover, ceramic substrate and metal components. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a flow chart of a method for preparing a porous structure Invar alloy connecting ring based on hybrid additive manufacturing provided by one embodiment of the present invention;

[0030] Figure 2 It is a logic diagram of a method for preparing a porous structure Invar alloy connecting ring based on hybrid additive manufacturing provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0031] The following is a further detailed description of a method for preparing a porous structure Invar alloy connecting ring based on hybrid additive manufacturing proposed by the present invention in combination with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purposes, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects that can be produced by the present invention and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0033] Combined with Figures 1-2 As shown, this embodiment provides a method for preparing a porous structure Invar alloy connecting ring based on hybrid additive manufacturing, including: step S110, obtaining the composition parameters of the connecting ring material based on the first principles, and the composition parameters of the connecting ring material include the composition and its weight percentage; step S120, obtaining the pore size parameters of the connecting ring based on the composition parameters of the connecting ring material and non-local density functional theory; and step S130, preparing the connecting ring by using a 3D printing process according to the composition parameters and pore size parameters of the connecting ring material.

[0034] Please also refer to Figure 1 and Figure 2, the step S110 includes: using density functional theory (DFT) to establish the temperature, component parameters and organizational structure relationship of the connecting ring material, that is, to establish a free energy model of the connecting ring material; using Monte Carlo method (MCM) to model the structure of the connecting ring material to obtain the quasi-random structure (Special Quaci-random Structure, SQS) of the connecting ring material; using deep neural network (DNN) algorithm to obtain the components in the connecting ring material with quasi-random structure and the weight percentage of each component.

[0035] It can be understood that the composition and weight percentage of the connecting ring material are: Fe: 32% to 36%, Ni: 60% to 64%, and the component M to be added: the balance.

[0036] Specifically, in this embodiment, the temperature, component parameters and organizational structure relationship of the connecting ring material can be expressed by the following formula: F=E-TS; wherein F is free energy, T is temperature, E and S are energy (Energy) and entropy (Entropy) of the system respectively; and the energy E and entropy S of the system need to include lattice vibration energy, entropy, atomic coordination entropy and electronic entropy, etc. More specifically, the temperature, component parameters and organizational structure relationship of the connecting ring material established by density functional theory is an integrated method for the development of new materials, and is also the basis for subsequent material calculations; the material data obtained by density functional theory calculations can provide a data set for subsequent machine learning (such as Monte Carlo method), and the combination of the two can predict material properties, so as to avoid the deficiency that in order to study material properties in the traditional method, the physical object must be manufactured according to the material formula (i.e. material parameters) and material structure. In this embodiment, step S110 is processed by computer simulation calculation throughout the process, which can accelerate the iteration speed of new materials and their structures and reduce the material iteration cost, but the present invention is not limited thereto.

[0037] Specifically, in this embodiment, the micro-scale control parameters, i.e., the components in the connecting ring material and the weight percentage of each component, can be obtained through step S110, so as to realize the composition design of the connecting ring material, thereby adjusting the inheritance of the composition and microstructure of the connecting ring material in the particle morphology control, and then ensuring that the connecting ring material has the Invar characteristic of zero expansion in a wide temperature range. In other words, the raw material composition and corresponding data of the lightweight Invar alloy that can be additively manufactured and laser welded can be obtained through step S110. More specifically, the connecting ring material contains Fe: 36%, Ni: 63%, and the component M to be added is Co and the weight percentage is 1%, but the present invention is not limited to this.

[0038] Please also refer to Figure 1 and Figure 2 The step S120 includes: obtaining the pore size distribution of micropores and mesopores in the connecting ring using the nonlocal density functional theory (NLDFT) according to the quasi-random structure and composition parameters of the connecting ring material.

[0039] It can be understood that the pore size of the micropores in the connecting ring is less than 2 nm, and the average pore size of the micropores is 1.5 nm, the pore size distribution range of the mesopores is 2 nm to 50 nm, and the average pore size of the mesopores is 30 nm.

[0040] Specifically, in this embodiment, on the basis of step S110, the non-local density functional theory can be further used to accurately analyze the distribution of micropores and mesopores in the connecting ring, so as to achieve the control design of the pores of the connecting ring, and then achieve the control of the material structure-level Invar properties; at the same time, on the basis of maintaining the Invar performance of the connecting ring at the key temperature threshold, the overall structure of the connecting ring is shaped according to the microwave optoelectronic head cover to ensure the expansion shape characteristics and temperature performance of the connecting ring, so as to achieve the surface shape structure control of the connecting ring, and then achieve the coordinated control design of the connection annularity of the porous structure of the Invar alloy. In other words, the structural design and corresponding data of the lightweight Invar alloy that can be used for additive manufacturing and laser welding can be obtained through step S120, but the present invention is not limited to this.

[0041] Please also refer to Figure 1 and Figure 2 , the step S130 includes: preparing raw materials according to the component parameters of the connecting ring material; fusing the raw materials using a laser powder bed fusion process to obtain the connecting ring, and the connecting ring is a porous structure with micropores and mesopores; according to the pore size distribution of the micropores and mesopores in the connecting ring, using a laser beam to correct the pore size and hole shape of the connecting ring.

[0042] Specifically, in this embodiment, according to the components and weight percentages of the components in the connecting ring material obtained in step S110, the raw material for printing the connecting ring can be prepared; using the raw material, and according to the pore size distribution parameters of the micropores and mesopores in the connecting ring obtained in step 120, that is, the pore size parameters, and using the laser powder bed fusion process for additive manufacturing, that is, 3D printing, a porous structure with micropores and mesopores, that is, the connecting ring, can be obtained; then, according to the actual pore size distribution of the micropores and mesopores in the connecting ring, an ultrafast laser beam (i.e., a fine laser beam) can be used to punch holes and control the texture of the connecting block, so as to precisely shape the macroscopic pores on the surface of the material, thereby realizing the porous shaping and calibration of the entire porous structure, that is, the connecting ring, under the expansion characteristics corresponding to the temperature threshold. That is to say, through step S130, a lightweight Invar alloy structural component, that is, a connecting ring, which can be laser welded can be obtained, but the present invention is not limited thereto.

[0043] Please continue to refer to Figure 2 The method for preparing a porous structure Invar alloy connecting ring based on hybrid additive manufacturing also includes: step S140, using laser to weld the connecting ring to the microwave optoelectronic head cover.

[0044] Specifically, in this embodiment, according to the light transmittance requirement in the wide temperature range zero expansion microwave optoelectronic head cover assembly, the connecting ring and the microwave optoelectronic head cover can be adaptively trimmed to achieve optical contact, and the metal / ceramic interface between the microwave optoelectronic head cover ceramic and the connecting ring can be micro-welded and sealed using an ultrafast laser beam to ensure the strength and sealing of the connection, thereby obtaining a hybrid additive manufacturing component. In particular, for non-transparent or translucent ceramics, a gap should be reserved during adaptive trimming and SiO2 transparent crystal microbeads should be filled as a brazing agent, so as to further carry out ultrafast laser micro-brazing to ensure the structural strength and sealing of the connection, but the present invention is not limited thereto.

[0045] In addition, in this embodiment, the step S110 can be executed by relying on a supercomputer and system as a physical carrier, and using the VASP open source data package and the commercial software MATLAB toolkit as program software; the step S120 can be executed by relying on a supercomputer and system as a physical carrier, and using the commercial software PTC Creo8.0 and the commercial software MATLAB toolkit as program software; the step S130 can be executed by relying on an additive manufacturing forming system and an ultrafast laser processing system; the step S140 can be executed by relying on an ultrafast laser welding system and a precision grinding and polishing system, but the present invention is not limited to this.

[0046] In summary, this embodiment provides a method for preparing a porous structure Invar alloy connecting ring based on hybrid additive manufacturing. The composition parameters of the connecting ring material can be obtained based on the first principle; the pore size parameters of the connecting ring can be obtained based on the composition parameters of the connecting ring material and the non-local density functional theory; the connecting ring can be prepared according to the composition parameters and pore size parameters of the connecting ring material and the 3D printing process. In this embodiment, when preparing the connecting ring using the 3D printing process (i.e., the additive manufacturing process), the raw materials can be prepared and regulated based on precise temperature control, and the raw materials can be fused using the laser powder bed fusion process to obtain the connecting ring, and the connecting ring can be punched using a fast laser beam, so as to quickly prepare the required connecting ring. This embodiment can solve the problems of the transferability of the Invar effect of the material of the connecting ring of the microwave optoelectronic head cover under the action of complex thermal history and its key measurement control, and finally realize the lightweight design and manufacturing of the Invar alloy connecting ring and the ultrafast laser welding and sealing for the optoelectronic head cover, forming a ceramic connecting ring design and hybrid additive manufacturing method for the microwave optoelectronic head cover for rapid verification of a small number of parts and rapid production of components; at the same time, it can also be applied to the connection structure of components such as tank ceramic protective armor, aircraft ceramic head covers, ceramic substrates and metal components.

[0047] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A method for preparing a porous structure Invar alloy connecting ring based on hybrid additive manufacturing, characterized in that: include: Obtaining composition parameters of the connecting ring material based on first principles, wherein the composition parameters of the connecting ring material include composition and its weight percentage; Based on the composition parameters of the connecting ring material and the non-localized density functional theory, obtaining the pore size parameters of the connecting ring; as well as According to the composition parameters and pore size parameters of the connecting ring material, the connecting ring is prepared by a 3D printing process; The step of obtaining the composition parameters of the connecting ring material based on the first principles includes: Density functional theory is used to establish the relationship between the temperature, composition parameters and organizational structure of the connecting ring material; Modeling the structure of the connecting ring material using a Monte Carlo method to obtain a quasi-random structure of the connecting ring material; Using a deep neural network algorithm, the components and weight percentage of each component in the connecting ring material having a quasi-random structure are obtained; The step of obtaining the aperture parameters of the connecting ring comprises: According to the quasi-random structure and composition parameters of the connecting ring material, the non-local density functional theory is used to obtain the pore size distribution of micropores and mesopores in the connecting ring; The step of preparing the connecting ring by using the 3D printing process comprises: preparing raw materials according to the composition parameters of the connecting ring material; The raw materials are fused by a laser powder bed fusion process to obtain the connecting ring, and the connecting ring is a porous structure with micropores and mesopores; According to the pore size distribution of micropores and mesopores in the connecting ring, the pore size and hole shape of the connecting ring are modified by using a laser beam; The method also includes: using laser to weld the connecting ring and the microwave optoelectronic head cover.

2. The method for preparing a porous structure Invar alloy connecting ring based on hybrid additive manufacturing according to claim 1, characterized in that: The composition and weight percentage of the connecting ring material are: Fe: 32%-36%, Ni: 60%-64%, and the component M to be added: the balance.

3. The method for preparing a porous structure Invar alloy connecting ring based on hybrid additive manufacturing according to claim 2, characterized in that: The component M to be added is Co.

4. The method for preparing a porous structure Invar alloy connecting ring based on hybrid additive manufacturing according to claim 1, characterized in that: The pore size of the micropores in the connecting ring is less than 2 nm, and the average pore size of the micropores is 1.5 nm. The pore size distribution range of the mesopores is 2 nm to 50 nm, and the average pore size of the mesopores is 30 nm.

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