A micro-nano structured al2o3-(5re 0.2 )3al5o 12 Preparation method of eutectic autogenous composite high-entropy ceramic

Abstract

The application discloses a kind of micro-nano structure Al2O3-(5RE 0.2 )3Al5O 12 Eutectic autogenous composite high-entropy ceramic preparation method belongs to the technical field of ceramic preparation.The application includes: (1) preparation eutectic component Al2O3-(5RE 0.2 )3Al5O 12 Ceramic powder, wherein RE is rare earth element, including Sc, Y and lanthanide series element, (5RE 0.2 )3 indicates that initial ceramic powder contains 5 kinds of molar ratio same, different category rare earth oxides;(2) using the Al2O3-(5RE 0.2 )3Al5O 12 Ceramic powder prepared in the step (1) as raw material, by laser cladding additive, ceramic powder is deposited layer by layer by laser cladding, and Al2O3-(5RE 0.2 )3Al5O 12 Eutectic autogenous composite high-entropy ceramic is obtained.The application prepares eutectic autogenous composite high-entropy ceramic by high adaptability raw material combined with laser cladding additive, significantly improves the preparation efficiency of ceramic device, and simultaneously prepares the ceramic device with excellent comprehensive performance.

Description

Technical Field

[0001] This invention belongs to the field of ceramic preparation technology, and relates to a method for preparing a micro / nano structured Al2O3-(5RE0.2)3Al5O12 eutectic self-generated composite high-entropy ceramic. Background Technology

[0002] Ceramics possess numerous advantages, including excellent insulation, corrosion resistance, high temperature resistance, high hardness, low density, and radiation resistance, leading to their widespread application across various sectors of the national economy. However, with the development of ceramic manufacturing technology and the expansion of its application scope, higher demands are being placed on the complexity of the performance, structural dimensions, and manufacturing efficiency of ceramic devices. In the process of ceramic manufacturing, a high degree of compatibility between raw materials and manufacturing technology is required to produce ceramics with performance and structure that meet actual needs in a short period of time.

[0003] Currently, due to limitations in the compatibility of raw materials and manufacturing techniques for ceramic devices, the resulting ceramic devices exhibit poor performance. Furthermore, the manufacturing efficiency is low, limiting the fabrication to relatively simple ceramic structures.

[0004] Therefore, it is necessary to provide an Al2O3-(5RE) 0.2 )3Al5O 12 A method for preparing eutectic self-generated composite high-entropy ceramics. By preparing suitable raw materials and combining them with advanced preparation techniques, high-performance ceramic devices can be rapidly prepared under highly adaptable raw material and preparation technology conditions. This improves preparation efficiency and ceramic device performance, and simultaneously achieves the goal of successfully preparing more complex ceramic devices. Summary of the Invention

[0005] To overcome the problems mentioned in the background, this invention proposes an Al2O3-(5RE) 0.2 )3Al5O 12 A method for preparing eutectic self-generated composite high-entropy ceramics involves preparing a highly fluid eutectic component, Al2O3-(5RE). 0.2 )3Al5O 12 Ceramic powder is used to meet the requirements of laser cladding additive manufacturing of ceramics, while simultaneously utilizing a high temperature gradient (>10°C). 4 K / cm laser cladding additive manufacturing of ceramics can achieve a maximum processing speed of 720 mm / min. At the same time, the solidified structure in the ceramic is fine, and the minimum eutectic spacing can be as small as 0.3 μm, which significantly improves the ceramic preparation efficiency and makes the prepared ceramics have excellent properties.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] The preparation method includes the following steps:

[0008] (1) Preparation of eutectic component Al2O3-(5RE) 0.2 )3Al5O 12 Ceramic powder, wherein RE is a rare earth element, including Sc, Y and lanthanides, (5RE) 0.2 )3 indicates that the initial ceramic powder contains 5 rare earth oxides of the same molar ratio but different categories;

[0009] (2) Using the Al2O3-(5RE) prepared in step (1) 0.2 )3Al5O 12 Using ceramic powder as raw material, Al2O3-(5RE) is obtained by laser cladding additive manufacturing, where the ceramic powder is deposited layer by layer. 0.2 )3Al5O 12 Eutectic self-generated composite high-entropy ceramics.

[0010] Preferably, the specific preparation process in step (1) includes the following steps:

[0011] S1: Weigh Al2O3 powder and five different rare earth oxide powders according to the molar ratio Al2O3:RE12O3:RE22O3:RE32O3:RE42O3:RE52O3 = 25:3:3:3:3:3. RE12O3-RE52O3 represent five different types of rare earth oxides. Use wet ball milling technology to thoroughly mix the Al2O3 powder and rare earth oxide powders. Then, dry the mixed powder, grind it, and pass it through a 1000-mesh sieve. Finally, calcine the powder to obtain a multi-principal solid solution single-phase structure (5RE... 0.2 )3Al5O 12 High-entropy rare-earth aluminate ceramic powder, then combined with a multi-principal-element solid solution single-phase structure (5RE) 0.2 )3Al5O 12 The high-entropy rare-earth aluminate ceramic powder was ground and passed through a 1000-mesh sieve and collected for later use.

[0012] S2: According to the molar ratio Al2O3:(5RE) 0.2 )3Al5O 12 =52:12 Weigh the (5RE) prepared in step S1. 0.2 )3Al5O 12 High-entropy rare-earth aluminate ceramic powder and Al2O3 powder were mixed thoroughly, dried, ground and sieved to obtain binary eutectic high-entropy ceramic powder.

[0013] S3: Pour the binary eutectic high-entropy ceramic powder obtained in step S2 into a stainless steel mold and press it to obtain a blocky eutectic high-entropy ceramic preform.

[0014] S4: The blocky eutectic high-entropy ceramic preform obtained in step S3 is calcined at high temperature to obtain an alumina-based eutectic high-entropy ceramic sample.

[0015] S5: The alumina-based eutectic high-entropy ceramic sample obtained in step S4 is pulverized and sieved to collect powder particles of 15–75 μm, which are the eutectic components Al2O3-(5RE). 0.2 )3Al5O 12 Ceramic powder.

[0016] Preferably, in step S1, the particle size of Al2O3 powder and rare earth oxide powder is 1-5 μm.

[0017] Preferably, in step S1, anhydrous ethanol is used as the wet ball milling medium, the ball milling speed is 300 r / min, and the ball milling time is 12 h.

[0018] Preferably, in step S1, the mixed powder is placed in an oven for drying at a temperature of 80°C for 4 hours, and then calcined at a temperature of 1600°C for 5 hours.

[0019] Preferably, in step S3, the pressing pressure is 120 MPa and the holding time is 5 min.

[0020] Preferably, in step S4, the calcination temperature is 1650℃ and the calcination time is 5h.

[0021] Preferably, the specific process of laser cladding additive manufacturing in step (2) is as follows:

[0022] Q1: The eutectic composition Al2O3-(5RE) sintered by hot pressing 0.2 )3Al5O 12 A ceramic sheet is placed below a laser nozzle as a substrate. Starting from the current position of the laser nozzle, a high-energy laser beam is controlled by the laser nozzle to linearly scan the ceramic substrate point by point, forming a continuously extending molten pool. Simultaneously, under the impetus of high-purity argon gas, the eutectic component Al2O3-(5RE) prepared in step (1) is coaxially delivered by the laser nozzle. 0.2 )3Al5O 12 The ceramic powder falls into the molten pool, melts, and solidifies together with the molten pool to form the first layer of Al2O3-(5RE). 0.2 )3Al5O 12 Eutectic self-generated composite high-entropy ceramic cladding layer;

[0023] Q2: Vertically raise the laser nozzle by a distance equal to the thickness of a cladding layer, and control the high-energy laser beam to linearly scan the first layer of Al2O3-(5RE) point by point in the direction of the starting point. 0.2 )3Al5O 12The eutectic self-generated composite high-entropy ceramic cladding layer forms a continuously extending molten pool. Simultaneously, the eutectic composition Al2O3-(5RE) 0.2 )3Al5O 12 The ceramic powder falls into the molten pool, melts and solidifies to form a second layer of Al2O3-(5RE) 0.2 )3Al5O 12 Eutectic self-generated composite high-entropy ceramic cladding layer;

[0024] Q3: Repeat the linear scan process in step Q2 cyclically to make the eutectic composition Al2O3-(5RE) 0.2 )3Al5O 12 Ceramic powder was deposited layer by layer through cladding to finally obtain Al2O3-(5RE) 0.2 )3Al5O 12 Eutectic self-generated composite high-entropy ceramics.

[0025] Preferably, during the laser cladding additive manufacturing process, the rotary powder feeder rotates at 5–15 rpm, the high-purity argon gas flow rate is 8–10 L / min, and during the cyclic linear reciprocating scanning process, the single-pass scanning length is 1–15 mm, the scanning speed is 24–720 mm / min, and the laser power is 100–500 W.

[0026] Preferably, the RE12O3-RE52O3 have the same crystal structure and their ionic radii differ by no more than 10%.

[0027] The beneficial effects of this invention are:

[0028] 1. This invention uses laser cladding additive manufacturing to prepare ceramics. Through layer-by-layer cladding deposition, ceramic devices that meet the requirements are finally obtained. This breaks through the limitations of molds in the ceramic preparation process and can prepare more ceramic devices with different structures and shapes while saving mold costs.

[0029] 2. This invention uses laser cladding additive manufacturing to prepare ceramics, with a maximum processing speed of 720 mm / min, which is relatively high and significantly improves the efficiency of ceramic device preparation.

[0030] 3. The ceramic prepared by this invention has a fine solidification structure, with a minimum eutectic spacing of 0.3 μm. The excellent microstructure determines that the ceramic has excellent mechanical and corrosion resistance properties.

[0031] 4. This invention prepares the eutectic component Al2O3-(5RE) 0.2 )3Al5O 12 Ceramic powder, with the eutectic component Al2O3-(5RE) 0.2 )3Al5O 12Ceramic powder has high fluidity and is highly compatible with laser cladding additive manufacturing. It will not cause negative impacts on laser cladding additive manufacturing due to agglomeration or other phenomena. Attached Figure Description

[0032] Figure 1 Preparation of Al2O3-(5RE) for this invention 0.2 )3Al5O 12 Process flow diagram of eutectic self-generated composite high-entropy ceramics.

[0033] Figure 2 The Al2O3-(5RE) prepared in Example 1 of this invention 0.2 )3Al5O 12 Photograph of a eutectic self-generated composite high-entropy ceramic sample.

[0034] Figure 3 The Al2O3-(5RE) prepared in Example 1 of this invention 0.2 )3Al5O 12 Scanning electron microscope image of eutectic self-generated composite high-entropy ceramics. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to specific embodiments.

[0036] In this embodiment of the invention, all chemical reagents not specifically described were commercially available analytical grade reagents used in the experiments.

[0037] The experimental procedure is as follows Figure 1 As shown: First, Al2O3-(5RE) was uniformly mixed according to the eutectic ratio. 0.2 )3Al5O 12 Eutectic high-entropy ceramic powder was condensed, then placed into a rotary powder feeder. Finally, a high-energy laser beam was linearly and cyclically scanned and melted using a laser nozzle based on coaxial powder feeding to prepare Al2O3-(5RE) by layer-by-layer deposition. 0.2 )3Al5O 12 Eutectic self-generated composite high-entropy ceramic sample. If the obtained sample meets the preset requirements, the experiment ends; otherwise, continue with the layer-by-layer cladding deposition experiment until the target eutectic self-generated composite high-entropy ceramic sample is obtained.

[0038] Example 1

[0039] In this embodiment, the following steps are used to prepare the micro / nano structure Al2O3-(Gd 0.2 Y 0. 2Ho 0.2 Yb 0.2 Er 0.2 )3Al5O 12Eutectic self-generated composite high-entropy ceramics:

[0040] (1) Commercially available ceramic powders of Al2O3, Gd2O3, Y2O3, Ho2O3, Yb2O3, and Er2O3 with particle sizes of 1–5 μm were used as initial raw materials. The corresponding ceramic powders were weighed according to a molar ratio of Al2O3:Gd2O3:Y2O3:Ho2O3:Yb2O3:Er2O3 = 25:3:3:3:3:3. Using anhydrous ethanol as the medium, the weighed mixed powders were ball-milled at 300 r / min for 12 h to ensure thorough mixing. Then, the thoroughly mixed composite ceramic powder was placed in an oven and dried at 80°C for 4 h. The dried ceramic powder was then ground in a mortar and passed through a 1000-mesh sieve and collected for later use. The collected ceramic powder was placed in a muffle furnace and calcined at 1600°C for 5 h to obtain a (Gd2O3) composite ceramic powder with a multi-principal solid solution single-phase structure. 0.2 Y 0.2 Ho 0.2 Yb 0.2 Er 0.2 )3Al5O 12 Ceramic powder. (Gd) 0.2 Y 0.2 Ho 0.2 Yb 0.2 Er 0.2 )3Al5O 12 The ceramic powder is ground in a mortar and passed through a 1000-mesh sieve and collected for later use.

[0041] (2) According to Al2O3:(Gd 0.2 Y 0.2 Ho 0.2 Y b0.2 E r0.2 )3Al5O 12 The corresponding ceramic powders were weighed at a molar ratio of 52:12. Using anhydrous ethanol as the medium, the weighed mixed powders were ball-milled at 300 r / min for 12 h to ensure thorough mixing. Then, the thoroughly mixed composite ceramic powders were placed in an oven and dried at 80°C for 4 h. The dried ceramic powders were then ground in a mortar and passed through a 1000-mesh sieve to obtain binary eutectic high-entropy ceramic powders.

[0042] (3) Pour the above-mentioned binary eutectic high-entropy ceramic powder into a stainless steel mold, and press it for 5 minutes at 120 MPa using a press to obtain a blocky eutectic high-entropy ceramic preform.

[0043] (4) The above-mentioned bulk eutectic high-entropy ceramic preform was placed in a muffle furnace and densified by high-temperature sintering at 1650℃ for 5 hours to obtain Al2O3-(Gd) with a certain strength. 0.2Y 0.2 Ho 0.2 Yb 0.2 Er 0.2 )3Al5O 12 Eutectic high-entropy ceramic sample.

[0044] (5) The above Al2O3-(Gd 0.2 Y 0.2 Ho 0.2 Yb 0.2 Er 0.2 )3Al5O 12 The eutectic high-entropy ceramic samples were crushed and sieved in a mortar to collect powder particles of 15–75 μm, which were then loaded into a rotary powder feeder for later use.

[0045] (6) Using laser cladding additive manufacturing technology based on coaxial powder feeding, the eutectic composition Al2O3-(5RE) is clad together. 0.2 )3Al5O 12 Al2O3-(Gd) was prepared by layer-by-layer cladding deposition of ceramic powder. 0.2 Y 0.2 Ho 0.2 Yb 0.2 Er 0.2 )3Al5O 12 The specific preparation process of the eutectic self-generated composite high-entropy ceramic sample is as follows:

[0046] The first step is to combine Al2O3-(Gd) 0.2 Y 0.2 Ho 0.2 Yb 0.2 Er 0.2 )3Al5O 12 The ceramic substrate is placed below the laser nozzle, and the vertical distance between the laser nozzle and the ceramic substrate is adjusted to 15mm.

[0047] The second step involves developing a control program composed of CNC control code and setting the process parameters. The program controls the laser's on / off state, the laser nozzle's trajectory, and the process parameters during processing. The laser power is set to 500W, the scanning speed to 720mm / min, the single-pass scanning length to 15mm, and the number of processing layers to 100.

[0048] The third step involves preparing Al2O3-(Gd) by cladding and depositing layers from the current location of the laser nozzle. 0.2 Y 0.2 Ho 0.2 Yb 0.2 Er 0.2 )3Al5O 12Eutectic self-generated composite high-entropy ceramic. The operation control program executes the button and activates the powder feeder. Under program control, the laser nozzle moves along a preset scanning path. During this process, a high-energy laser beam is output from the laser nozzle and interacts with the substrate below to form a molten pool. Simultaneously, ceramic powder in the rotating powder feeder, propelled by high-purity argon gas, is fed through the laser nozzle and falls into the molten pool to melt. After solidification with the molten pool, it forms Al2O3-(Gd) 0.2 Y 0.2 Ho 0.2 Yb 0.2 Er 0.2 )3Al5O 12 Eutectic self-generated composite high-entropy ceramic cladding layer.

[0049] After the laser nozzle completes one single-pass scan length, it vertically increases by the thickness of one cladding layer, then moves back one scan length towards the starting point, and so on, repeating this cycle until the desired Al2O3-(Gd) is obtained. 0.2 Y 0.2 Ho 0.2 Yb 0.2 Er 0.2 )3Al5O 12 Eutectic self-generated composite high-entropy ceramic sample. During processing, the rotary powder feeder speed was set to 15 rpm, and the high-purity argon gas flow rate was 10 L / min. After obtaining the target eutectic high-entropy ceramic sample, the laser and powder feeder were turned off, and the processing ended.

[0050] The eutectic self-generated composite high-entropy ceramic material prepared in this embodiment is as follows: Figure 2 As shown, the scanning electron microscope image is as follows: Figure 3 As shown.

[0051] pass Figure 2 It can be seen that no obvious solidification defects such as cracks were formed in the sample.

[0052] pass Figure 3 It can be seen that the solidified structure of the eutectic self-generated composite high-entropy ceramic prepared by the present invention is fine, and the eutectic spacing can reach 0.3 μm.

[0053] Example 2

[0054] This embodiment uses the same raw materials and methods as Example 1, the difference being that the process parameters are different during laser cladding additive manufacturing. Specific process parameters are shown in Table 1.

[0055] Example 3

[0056] This embodiment uses the same raw materials and methods as Example 1, the difference being that the process parameters are different during laser cladding additive manufacturing. Specific process parameters are shown in Table 1.

[0057] Example 4

[0058] This embodiment uses the same raw materials and methods as Example 1, the difference being that the process parameters are different during laser cladding additive manufacturing. Specific process parameters are shown in Table 1.

[0059] Table 1 Process parameters for Examples 2-4

[0060] Example laser power Scan rate Single scan length Powder feeder speed Argon flow rate Example 2 400W 500mm / min 10mm 12rpm 10L / min Example 3 250W 300mm / min 5mm 8rpm 9L / min Example 4 100W 24mm / min 1mm 5rpm 8L / min

[0061] Al2O3-(Gd) prepared in Examples 2-4 0.2 Y 0.2 Ho 0.2 Yb 0.2 Er 0.2 )3Al5O 12 The properties of the eutectic high-entropy ceramic are similar to those in Example 1, and will not be repeated here.

[0062] In summary, the method of this invention can successfully prepare micro / nano structures of Al2O3-(5RE) 0.2 )3Al5O 12 The preparation of eutectic self-generated composite high-entropy ceramics is characterized by high compatibility between raw materials and preparation technology, with no interruptions or other impacts. The resulting ceramics are free of cracks and defects, exhibiting good quality and small eutectic spacing, which helps to improve the overall performance of the ceramics.

[0063] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A micro-nano structured Al203-(5RE 0.2 )3Al5O 12 The preparation method of the eutectic autogenous composite high-entropy ceramic is characterized by comprising the following steps: The preparation method comprises the following steps: (1) Preparation of eutectic component Al2O3-(5RE 0.2 )3Al5O 12 ceramic powder, wherein RE is a rare earth element, including Sc, Y and lanthanide series elements, (5RE 0.2 )3 indicates that 5 kinds of rare earth oxides with the same molar ratio are contained in the initial ceramic powder The specific preparation process in the step (1) comprises the following steps: S1: Al2O3 powder and five different rare earth oxide powders are weighed according to the molar ratio of Al2O3:RE12O3:RE22O3:RE32O3:RE42O3:RE52O3=25:3:3:3:3:3, RE12O3-RE52O3 represent five different types of rare earth oxides, the Al2O3 powder and the rare earth oxide powder are fully mixed by using a wet ball milling technique, then the mixed powder is dried, ground and sieved through a 1000 mesh sieve, and then the powder is calcined to obtain a multi-principal solid solution single-phase structure (5RE 0.2 )3Al5O 12 high-entropy rare earth aluminate ceramic powder, the multi-principal solid solution single-phase structure (5RE 0.2 )3Al5O 12 high-entropy rare earth aluminate ceramic powder is ground and sieved through a 1000 mesh sieve, and collected for use; S2: weighing the (5RE 0.2 )3Al5O 12 =52:12 prepared in step S1 according to the molar ratio Al2O3:(5RE 0.2 )3Al5O 12 high-entropy rare earth aluminate ceramic powder and Al2O3 powder, and the powders are fully mixed and dried, then ground and sieved to obtain a binary eutectic high-entropy ceramic powder; S3: pouring the binary eutectic high-entropy ceramic powder obtained in the step S2 into a stainless steel mold for pressing to obtain a block-shaped eutectic high-entropy ceramic preform; S4: calcining the block-shaped eutectic high-entropy ceramic preform obtained in the step S3 at high temperature to obtain an alumina-based eutectic high-entropy ceramic sample piece; S5: crushing and sieving the Al2O3-based eutectic high-entropy ceramic sample obtained in step S4, and collecting powder particles of 15-75 μm, i.e. the eutectic component Al2O3-(5RE 0.2 )3Al5O 12 ceramic powder; (2) using the Al2O3-(5RE 0.2 )3Al5O 12 ceramic powder prepared in step (1) as a raw material, through laser cladding additive manufacturing, the ceramic powder is deposited layer by layer by laser cladding, to obtain Al2O3-(5RE 0.2 )3Al5O 12 eutectic autogenous composite high-entropy ceramic.

2. The micro-nano structured Al203-(5RE 0.2 )3Al5O 12 The preparation method of the eutectic autogenous composite high-entropy ceramic is characterized by comprising the following steps: In the step S1, the particle size of the Al2O3 powder and the rare earth oxide powder is 1-5 μm.

3. The micro-nano structured Al203-(5RE 0.2 )3Al5O 12 The preparation method of the eutectic autogenous composite high-entropy ceramic is characterized by comprising the following steps: In the step S1, anhydrous ethanol is used as the wet ball milling medium, the ball milling rotation speed is 300 r / min, and the ball milling time is 12 h.

4. The micro-nano structured Al203-(5RE 0.2 )3Al5O 12 The preparation method of the eutectic autogenous composite high-entropy ceramic is characterized by comprising the following steps: In the step S1, the mixed powder is placed in an oven for drying, the drying temperature is 80℃, the holding time is 4 h, the calcination temperature is 1600℃, and the calcination time is 5 h.

5. The micro-nano structured Al203-(5RE 0.2 )3Al5O 12 The preparation method of the eutectic autogenous composite high-entropy ceramic is characterized by comprising the following steps: In the step S3, the pressing pressure is 120 MPa, and the pressure holding time is 5 min.

6. The micro-nano structured Al203-(5RE 0.2 )3Al5O 12 The preparation method of the eutectic autogenous composite high-entropy ceramic is characterized by comprising the following steps: In the step S4, the calcination temperature is 1650℃, and the calcination time is 5 h.

7. The micro-nano structured Al203-(5RE 0.2 )3Al5O 12 The preparation method of the eutectic autogenous composite high-entropy ceramic is characterized by comprising the following steps: The specific process of the laser cladding additive manufacturing in the step (2) is as follows: Q1: eutectic component Al2O3-(5RE 0.2 )3Al5O 12 ceramic sheet as a substrate and placed below the laser nozzle, with the current position of the laser nozzle as the starting point, using the laser nozzle to control the high-energy laser beam to linearly scan the ceramic substrate point by point to form a continuously extending molten pool, at the same time, under the push of high-purity argon, the eutectic component Al2O3-(5RE 0.2 )3Al5O 12 ceramic powder falls into the molten pool and melts and solidifies with the molten pool to form a first layer of Al2O3-(5RE 0.2 )3Al5O 12 eutectic self-grown composite high-entropy ceramic cladding layer; Q2: The laser nozzle is vertically lifted by a distance of one cladding layer thickness, and the high-energy laser beam is controlled to linearly scan the first layer of Al2O3-(5RE 0.2 )3Al5O 12 Eutectic autogenous composite high-entropy ceramic cladding layer, forming a continuously extending molten pool, at the same time, the eutectic component Al2O3-(5RE 0.2 )3Al5O 12 The ceramic powder falls into the molten pool and solidifies to form the second layer of Al2O3-(5RE 0.2 )3Al5O 12 Eutectic autogenous composite high-entropy ceramic cladding layer; Q3: The linear scanning process in step Q2 is repeated in a cycle, so that the eutectic composition Al2O3-(5RE 0.2 )3Al5O 12 ceramic powder is deposited layer by layer, and finally Al2O3-(5RE 0.2 )3Al5O 12 eutectic self-grown composite high-entropy ceramic is obtained.

8. The micro-nano structured Al203-(5RE 0.2 )3Al5O 12 The preparation method of the eutectic autogenous composite high-entropy ceramic is characterized by comprising the following steps: In the laser cladding additive manufacturing process, the rotation speed of the rotary powder feeder is 5-15 rpm, the flow rate of high-purity argon is 8-10 L / min, in the linear reciprocating scanning process, the single-pass scanning length is 1-15 mm, the scanning speed is 24-720 mm / min, and the laser power is 100-500 W.

9. A micro-nano structured Al203-(5RE 0.2 )3Al5O 12 The preparation method of the eutectic autogenous composite high-entropy ceramic is characterized by comprising the following steps: The RE12O3-RE52O3 has the same crystal structure, and the maximum difference in ionic radius is not more than 10%.

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