Ceramic-metal composite and method for producing same

Abstract

The application provides a ceramic-metal composite material and a preparation method thereof, and belongs to the field of ceramic-metal composite material manufacturing. The preparation method of the ceramic-metal composite material comprises the following steps: heating and mixing a ceramic precursor and metal powder to obtain a mixed slurry; using an inkjet 3D printing technology to prepare the mixed slurry into a composite material preform; and sintering the composite material preform to obtain the ceramic-metal composite material. The preparation method can improve the problem of high porosity of the nanoscale ceramic particle reinforced metal matrix composite material to a certain extent.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ceramic-metal composite material manufacturing, in particular, to a ceramic-metal composite material and a preparation method thereof. BACKGROUND

[0002] In the prior art, nanoscale ceramic particle reinforced metal matrix composite materials are widely used in mechanical equipment, power equipment, building materials and metallurgical equipment industries due to their high strength, high hardness, good wear resistance and plasticity, and easy forming.

[0003] However, the nanoscale ceramic particle reinforced metal matrix composite material prepared by the existing preparation process has the problem of high porosity, which limits the popularization and application of such materials. SUMMARY

[0004] The purpose of the present application is to provide a ceramic-metal composite material and a preparation method thereof, which can improve the problem of high porosity of nanoscale ceramic particle reinforced metal matrix composite materials to some extent.

[0005] The embodiments of the present application are implemented as follows:

[0006] In a first aspect, the embodiments of the present application provide a preparation method of a ceramic-metal composite material, comprising the following steps:

[0007] heating and mixing the ceramic precursor and the metal powder to obtain a mixed slurry;

[0008] using inkjet 3D printing technology to prepare the mixed slurry into a composite material preform; and

[0009] sintering the composite material preform to obtain the ceramic-metal composite material.

[0010] In the above technical solution, the ceramic precursor is used as a reaction raw material. The ceramic precursor not only serves as a source of ceramic phase, but also acts as a support for ink and binder components. Compared with the traditional inkjet 3D printing process (which requires the addition of ceramic phase raw materials, support ink, and binder components, and requires subsequent removal steps), the subsequent removal process can be omitted, thereby enabling the nanoscale ceramic particle reinforced metal matrix composite material prepared to have the advantages of not being easily deformed, having few defects, and having low porosity. Therefore, the preparation method of the nanoscale ceramic particle reinforced metal matrix composite material provided by the embodiments of the present application uses the ceramic precursor and the inkjet 3D printing technology at the same time, which not only has the advantages of high material utilization, simple preparation process, and high preparation efficiency, but also enables the nanoscale ceramic particle reinforced metal matrix composite material prepared to have a low porosity.

[0011] In some alternative embodiments, the ceramic precursor includes one or more of polycarbosilane, polysilazane, and polyborazane.

[0012] In the technical solution above, the preparation process provided by the embodiments of the present application is suitable for the above-mentioned various ceramic precursor systems, and can provide more implementable solutions, thereby facilitating the popularization and application of the preparation process provided by the embodiments of the present application.

[0013] In some alternative embodiments, the metal powder includes one or more of aluminum powder, copper powder, and nickel powder.

[0014] In the technical solution above, the preparation process provided by the embodiments of the present application is suitable for the above-mentioned various metal systems, and can provide more implementable solutions, thereby facilitating the popularization and application of the preparation process provided by the embodiments of the present application.

[0015] In some alternative embodiments, the solid phase content in the mixed slurry is 10-60%.

[0016] In the technical solution above, the solid phase content in the mixed slurry is limited in the range above, which can make the mixed slurry have appropriate viscosity, thereby making the mixed slurry have appropriate fluidity, so as to ensure that the finally prepared product has higher density.

[0017] In some alternative embodiments, in the step of heating and mixing the ceramic precursor and the metal powder, the processing temperature is 150-250°C, and the processing time is 1-3h.

[0018] In the technical solution above, the processing temperature and time in the heating and mixing process are respectively limited in the ranges above, which can make the heating and mixing process be carried out under appropriate conditions, thereby ensuring the uniformity of the mixing of the ceramic precursor and the metal powder in the mixed slurry.

[0019] In some alternative embodiments, in the step of preparing the composite material preform from the mixed slurry by using the inkjet 3D printing technology, the pressure of the nozzle is 0.1-1MPa.

[0020] In the technical solution above, in the preparation process of the composite material preform, the pressure of the nozzle is limited in the range above, which can make the pressure at the nozzle be in an appropriate range, thereby making the mixed slurry be applied to the cooling unit below the nozzle at an appropriate flow rate, and further facilitating the preparation of the composite material preform.

[0021] In some alternative embodiments, in the step of preparing the composite material preform from the mixed slurry by using the inkjet 3D printing technology, the step further includes a step of cross-linking and non-melting the mixed slurry after passing through the nozzle and being condensed and solidified.

[0022] In the technical solution, the step of cross-linking and infusibilization is added, so that the gas generated by the cracking of the ceramic precursor can be effectively prevented from escaping from the preform during the subsequent sintering process, thereby effectively preventing the problem of low ceramic yield, and effectively preventing the problems of high porosity and severe deformation of the finally prepared composite material.

[0023] In some optional embodiments, in the step of performing cross-linking and infusibilization, the following steps are included:

[0024] The mixed slurry after passing through the nozzle and being condensed and solidified is irradiated by the irradiation beam;

[0025] Optionally, the irradiation beam includes one or more of a high-energy electron beam, a gamma ray, and a high-energy neutron beam.

[0026] In the technical solution, the cross-linking and infusibilization treatment method is used, which has the advantages of simple treatment process and good cross-linking and infusibilization effect compared with other cross-linking and infusibilization treatment methods.

[0027] Further, the preparation process provided by the embodiments of the present application is suitable for the above-mentioned various irradiation beam systems, which can provide more implementable solutions, thereby facilitating the popularization and application of the preparation process provided by the embodiments of the present application.

[0028] In some optional embodiments, in the step of performing cross-linking and infusibilization, the emission dose rate of the irradiation generator is 10-20 kGy / s.

[0029] In the technical solution, the emission dose rate of the irradiation generator is limited to the above range, so that the cross-linking and infusibilization treatment process can be carried out under suitable conditions, thereby ensuring good cross-linking and infusibilization effect.

[0030] In a second aspect, the embodiments of the present application provide a ceramic-metal composite material, and the porosity of the ceramic-metal composite material is not greater than 3%.

[0031] In the technical solution, the porosity of the ceramic-metal composite material provided by the embodiments of the present application can reach a level of not greater than 3%, which has lower porosity and densification compared with conventional ceramic-metal composite materials (the porosity is usually not lower than 5%). BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope. Other related drawings can also be obtained by those skilled in the art without creative labor.

[0033] Figure 1 A process flow chart of a preparation method of a ceramic-metal composite material is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0034] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below. If specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by manufacturers are used. If manufacturers of reagents or instruments are not specified, all are conventional products that can be purchased on the market.

[0035] It should be noted that in the present application, “and / or”, such as “feature 1 and / or feature 2”, means “feature 1” alone, “feature 2” alone, or “feature 1” plus “feature 2”.

[0036] In addition, in the description of the present application, unless otherwise specified, “multiple” in “one or more” means two or more; the range of “value a~value b” includes both end values “a” and “b”, and “unit of measurement” in “value a~value b+unit of measurement” represents the “unit of measurement” of both “value a” and “value b”.

[0037] In the prior art, nano ceramic particle reinforced metal matrix composite materials are widely used in mechanical equipment, power equipment, building materials and metallurgical equipment industries due to their high strength and hardness, good wear resistance and plasticity, and easy forming.

[0038] However, due to the high price of nano ceramic particles and the difficulty of dispersing them in the metal matrix, nano ceramic particle reinforced metal matrix composite materials have not been widely used. In addition, during the processing of nano ceramic particle reinforced metal matrix composite materials into preforms or finished products, subsequent cutting is required, which not only wastes materials, but also makes mechanical processing very difficult due to the presence of hard ceramic particles, which makes the final prepared nano ceramic particle reinforced metal matrix composite material finished product very expensive, limiting its application.

[0039] Therefore, the person skilled in the art usually uses inkjet 3D printing technology (a near-net-shape forming technology) to prepare the corresponding material preform. However, although inkjet 3D printing technology can directly print into a preform and achieve very high precision and complexity, almost no mechanical processing is required, and the material utilization rate is high. However, the support ink, binder, photocuring agent and the like used in the existing inkjet 3D printing technology need to be removed through subsequent processes, which makes the prepared material have a high porosity and the preparation process is relatively complicated.

[0040] Based on the above problems, the inventors have found through creative research that the combination of ceramic precursor raw materials and inkjet 3D printing technology can not only prepare a nano ceramic particle reinforced metal matrix composite material with low porosity, but also has the advantages of high material utilization, simple process, low preparation cost, and high preparation efficiency.

[0041] The ceramic-metal composite material and the preparation method thereof according to the embodiments of the present application will be described in detail below.

[0042] In a first aspect, the embodiments of the present application provide a preparation method of a ceramic-metal composite material, which comprises the following steps: heating and mixing ceramic precursors and metal powders to obtain a mixed slurry; using an inkjet 3D printing technology to prepare the mixed slurry into a composite material preform; and sintering the composite material preform to obtain a ceramic-metal composite material.

[0043] In the present application, the ceramic precursor is used as a reaction raw material. The ceramic precursor not only serves as a source of ceramic phase, but also acts as a support ink and a binder component. Compared with the traditional inkjet 3D printing process (which requires the simultaneous addition of ceramic phase raw materials, support ink, and binder components, and requires a subsequent removal step), the subsequent removal process can be omitted, thereby enabling the prepared nano ceramic particle reinforced metal matrix composite material to have the advantages of not being easily deformed, having few defects, and having low porosity. Therefore, the preparation method of the nano ceramic particle reinforced metal matrix composite material provided by the embodiments of the present application, which uses both ceramic precursors and inkjet 3D printing technology, not only has the advantages of high material utilization, simple preparation process, and high preparation efficiency, but also enables the prepared nano ceramic particle reinforced metal matrix composite material to have a low porosity.

[0044] It should be noted that the type of ceramic precursor is not limited and can be adjusted according to actual needs.

[0045] As an example, the ceramic precursor includes one or more of polycarbosilane, polysilazane, and polyborazylene.

[0046] In this embodiment, the preparation process provided by the embodiments of the present application is suitable for the above-mentioned various ceramic precursor systems, can provide more implementable schemes, and thus facilitates the popularization and application of the preparation process provided by the embodiments of the present application.

[0047] It should be noted that the type of metal powder is not limited and can be adjusted according to actual needs.

[0048] As an example, the metal powder includes one or more of aluminum powder, copper powder, and nickel powder.

[0049] In this embodiment, the preparation process provided by the application is suitable for the above-mentioned various metal systems, and can provide more implementable schemes, thereby facilitating the popularization and application of the preparation process provided by the application.

[0050] It should be noted that the solid phase content of the mixed slurry can be optimized in consideration of the density of the prepared product.

[0051] As an example, the solid phase content of the mixed slurry is 10-60%, for example but not limited to any one of the point values of 10%, 20%, 30%, 40%, 50% and 60% or a range value between any two of them.

[0052] In this embodiment, the solid phase content of the mixed slurry is limited in the above-mentioned range, which can make the mixed slurry have a suitable viscosity, thereby making the mixed slurry have a suitable fluidity to ensure that the finally prepared product has a higher density.

[0053] It should be noted that the process conditions in the heating and mixing process are not limited, and can be adjusted according to actual needs.

[0054] As an example, in the step of heating and mixing the ceramic precursor and the metal powder, the treatment temperature is 150-250℃, for example but not limited to any one of the point values of 150℃, 180℃, 200℃, 220℃ and 250℃ or a range value between any two of them; the treatment time is 1-3h, for example but not limited to any one of the point values of 1h, 1.5h, 2h, 2.5h and 3h or a range value between any two of them.

[0055] In this embodiment, the treatment temperature and time in the heating and mixing process are respectively limited in the above-mentioned ranges, which can make the heating and mixing process proceed under suitable conditions, thereby ensuring the uniformity of the mixing of the ceramic precursor and the metal powder in the mixed slurry.

[0056] It should be noted that the process flow of inkjet 3D printing is not limited, and can be selected according to the conventional selection in the art.

[0057] As an example, the inkjet 3D printing includes the following steps:

[0058] The printing cavity is vacuumized to make the printing cavity in a vacuum state, and the nozzle is heated to maintain the nozzle at a preset temperature.

[0059] The prepared mixed slurry is injected into the nozzle by using the pressurizing device, and then the mixed slurry is injected into the cooling unit through the nozzle to rapidly condense and solidify the mixed slurry, while the nozzle is controlled to move in X, Y and Z directions by the movement control unit to prepare the composite material preform of the preset model.

[0060] It should be noted that the vacuum degree in the printing cavity is not limited, and can be set according to the conventional selection in the art.

[0061] It should be noted that the preset temperature is not limited in size, and can be set according to the conventional selection in the art.

[0062] As an example, the preset temperature is 180-400℃, for example but not limited to any one point value or a range value between any two of 180℃, 200℃, 250℃, 300℃, 350℃ and 400℃.

[0063] It should be noted that the pressure at the nozzle is not limited in size, and can be set according to the conventional selection in the art.

[0064] As an example, in the step of preparing the mixed slurry into the composite material preform by using the inkjet 3D printing technology, the pressure of the nozzle is 0.1-1MPa, for example but not limited to any one point value or a range value between any two of 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa, 0.9MPa and 1MPa.

[0065] In this embodiment, the pressure of the nozzle is limited in the above range during the preparation of the composite material preform, which can make the pressure at the nozzle in a suitable range, so that the mixed slurry can be applied to the cooling unit below the nozzle at a suitable flow rate, thereby facilitating the preparation of the composite material preform.

[0066] It should be noted that the preparation process of the composite material preform can be optimized considering the porosity of the prepared composite material preform.

[0067] As an example, in the step of preparing the mixed slurry into the composite material preform by using the inkjet 3D printing technology, the step of cross-linking and non-melting treatment of the mixed slurry after passing through the nozzle and condensing and solidifying is further included.

[0068] It should be noted that the cross-linking non-melting treatment refers to: generating free radicals in the polymer by various means, the generated free radicals combine with each other to form new connecting bonds, so that the polymer is cross-linked to form a three-dimensional network molecular structure, thereby changing from meltable to non-meltable, and the high-temperature resistance and strength at high temperature are both obviously improved.

[0069] In this embodiment, the step of cross-linking non-melting treatment is additionally provided, which can effectively avoid the gas generated by the cracking of the ceramic precursor from escaping from the preform in the subsequent sintering process, thereby effectively avoiding the problem of low ceramic yield, and also effectively avoiding the problems of high porosity and severe deformation of the finally prepared composite material.

[0070] It should be noted that the cross-linking non-melting treatment method is not limited, and can be irradiated by an irradiation beam or can be oxidized at a high temperature (generally at 200-400℃).

[0071] As an example, in the step of cross-linking non-melting treatment, the following steps are included:

[0072] The mixed slurry after passing through the nozzle and being condensed and solidified is irradiated by an irradiation beam.

[0073] Optionally, the irradiation beam includes one or more of a high-energy electron beam, a gamma ray, and a high-energy neutron beam.

[0074] In this embodiment, compared with the chemical cross-linking method, the irradiation cross-linking has a series of advantages, for example, the radiation cross-linking can be completed at room temperature and normal pressure; the absorption dose can be controlled to control the cross-linking degree and be easy to reproduce; in addition, the radiation cross-linking also has the advantages of pure product, no waste generation, and high production efficiency.

[0075] It should be noted that after the polymer irradiation cross-linking, the linear structure is changed into a network structure, and the performance will change accordingly: ① from meltable to non-meltable, the high-temperature resistance and the strength at high temperature are obviously improved; ② new connecting bonds are formed between molecules, which prevents the relative slipping of molecules, increases the rigidity, and reduces the creep behavior; ③ the stress cracking resistance is improved.

[0076] Further, the preparation process provided by the embodiments of the present application is suitable for the above-mentioned various irradiation beam systems, which can provide more implementable schemes, thereby facilitating the popularization and application of the preparation process provided by the embodiments of the present application.

[0077] It should be noted that the high-energy irradiation beam used in the present application not only can realize cross-linking non-melting treatment, but also can realize solidification, which needs to be distinguished from the conventional irradiation beam (such as UV rays or low-energy electron beam, which can only realize solidification function).

[0078] In order to better understand the scheme, the gamma rays are taken as an example here: the gamma rays are electromagnetic waves with shorter wavelength and higher energy, the wavelength is only 10 -2 ~ 10 -5 nm, and the energy is as high as 1.17 Me V~1.33 Me V; however, the photon energy range of thermochemical and photochemical reactions is only a few electron volts to dozens of electron volts, photochemical reactions can only cause single excited states, and the action of photons and atoms has strict limitations, only one photon can act on one atom, and only photons of a certain wavelength can be absorbed by certain substances. Unlike this, one high-energy particle in the gamma rays can produce many excited molecules or ions in the irradiated material, and many active particle species are produced during the irradiation process.

[0079] It should be noted that in the step of performing cross-linking and infusibilization treatment, the size of the irradiation dose rate is not limited and can be adjusted according to actual needs.

[0080] As an example, in the step of performing cross-linking and infusibilization treatment, the emission dose rate of the irradiation generator is 10~20 kGy / s, such as but not limited to any one of 10 kGy / s, 12 kGy / s, 14 kGy / s, 16 kGy / s, 18 kGy / s and 20 kGy / s or a range value between any two of them.

[0081] In this embodiment, the emission dose rate of the irradiation generator is limited in the above range, which can enable the cross-linking and infusibilization treatment process to be performed under suitable conditions, thereby ensuring a better cross-linking and infusibilization effect.

[0082] It should be noted that after the composite material preform is prepared, the subsequent sintering process is not limited and can be set according to conventional selection in the art.

[0083] As an example, in the sintering process, the treatment temperature is 600~1300℃, and the treatment time is 2~6h.

[0084] It should be noted that in the preparation process of the ceramic-metal composite material, the steps and processes that are not particularly limited or explained are not limited and can be set according to conventional selection in the art.

[0085] As an example, the process flow chart of the preparation method of the ceramic-metal composite material provided by the embodiments of the present application can be exemplarily referred to Figure 1 .

[0086] In a second aspect, the embodiments of the present application provide a ceramic-metal composite material, and the porosity of the ceramic-metal composite material is not greater than 3%.

[0087] In the present application, the porosity of the ceramic-metal composite material provided by the embodiments of the present application can reach not more than 3%, which has lower porosity and denseness compared with conventional ceramic-metal composite materials.

[0088] The features and performances of the present application are further described in detail below in combination with embodiments.

[0089] Embodiment 1

[0090] The present application provides a preparation method of a ceramic-metal composite material, comprising the following steps:

[0091] The polycarbosilane and the aluminum metal powder are mixed, and then stirred on a stirrer at 180℃ for 2h to obtain a mixed slurry; wherein the solid content of the mixed slurry is 50%.

[0092] The air in the printing cavity is removed by using a vacuum pump, then the nozzle is heated to 200℃, then the mixed slurry is injected into the nozzle by using a pressurizing pump, then the mixed slurry is injected onto the cooling unit by controlling the pressure at the nozzle to be 0.2MPa, at the same time, the nozzle is controlled to move according to a preset trajectory by using a movement control unit, and the mixed slurry is cross-linked and infusibilized by using a high-energy electron beam emitted by an irradiation generator, until a composite material preform of a preset model is obtained; wherein the emission dose rate is 12kGy / s.

[0093] Then, the prepared composite material preform is sintered at 600℃ for 3h to obtain a ceramic-metal composite material finished product.

[0094] Embodiment 2

[0095] The present application provides a preparation method of a ceramic-metal composite material, comprising the following steps:

[0096] The polycarbosilane and the aluminum metal powder are mixed, and then stirred on a stirrer at 150℃ for 3h to obtain a mixed slurry; wherein the solid content of the mixed slurry is 10%.

[0097] The air in the printing cavity is removed by using a vacuum pump, then the nozzle is heated to 200℃, then the mixed slurry is injected into the nozzle by using a pressurizing pump, then the mixed slurry is injected onto the cooling unit by controlling the pressure at the nozzle to be 0.1MPa, at the same time, the nozzle is controlled to move according to a preset trajectory by using a movement control unit, and the mixed slurry is cross-linked and infusibilized by using a high-energy electron beam emitted by an irradiation generator, until a composite material preform of a preset model is obtained; wherein the emission dose rate is 10kGy / s.

[0098] Then, the prepared composite preform is sintered at 600 DEG C for 2h to obtain a ceramic-metal composite product.

[0099] Example 3

[0100] The embodiment of the present application provides a preparation method of a ceramic-metal composite material, which comprises the following steps.

[0101] The polycarbosilane and the aluminum powder are mixed, and then stirred on a blender at 250 DEG C for 1h to obtain a mixed slurry; wherein the solid content of the mixed slurry is 60%.

[0102] Air in the printing cavity is removed by using a vacuum pump, then the nozzle is heated to 200 DEG C, then the mixed slurry is injected into the nozzle by using a pressurizing pump, then the mixed slurry is injected onto the cooling unit by controlling the pressure at the nozzle to be 1MPa, at the same time, the nozzle is controlled to move according to a preset track by using a moving control unit, and the mixed slurry is crosslinked and infusibilized by using a high-energy electron beam emitted by an irradiation generator, until a composite preform of a preset model is obtained; wherein the emission dose rate is 20kGy / s.

[0103] Then, the prepared composite preform is sintered at 700 DEG C for 2h to obtain a ceramic-metal composite product.

[0104] Example 4

[0105] The embodiment of the present application provides a preparation method of a ceramic-metal composite material, which comprises the following steps.

[0106] The polycarbosilane and the aluminum powder are mixed, and then stirred on a blender at 200 DEG C for 2h to obtain a mixed slurry; wherein the solid content of the mixed slurry is 55%.

[0107] Air in the printing cavity is removed by using a vacuum pump, then the nozzle is heated to 200 DEG C, then the mixed slurry is injected into the nozzle by using a pressurizing pump, then the mixed slurry is injected onto the cooling unit by controlling the pressure at the nozzle to be 0.3MPa, at the same time, the nozzle is controlled to move according to a preset track by using a moving control unit, and the mixed slurry is crosslinked and infusibilized by using a high-energy electron beam emitted by an irradiation generator, until a composite preform of a preset model is obtained; wherein the emission dose rate is 15kGy / s.

[0108] Then, the prepared composite preform is sintered at 850 DEG C for 3h to obtain a ceramic-metal composite product.

[0109] Example 5

[0110] The embodiment of the present application provides a preparation method of a ceramic-metal composite material, which comprises the following steps.

[0111] Mixing polycarbosilane and metal nickel powder, then stirring on a blender at 200℃ for 2h to obtain a mixed slurry; wherein the solid content of the mixed slurry is 45%.

[0112] Excluding air in the printing cavity by using a vacuum pump, then heating the nozzle to 200℃, then injecting the mixed slurry into the nozzle by a pressure pump, then controlling the pressure at the nozzle to be 0.4MPa to inject the mixed slurry onto the cooling unit, at the same time, controlling the nozzle to move according to a preset track by moving the control unit, and crosslinking and infusibilizing the mixed slurry by the high-energy electron beam emitted by the irradiation generator until a composite preform of a preset model is obtained; wherein the emission dose rate is 18kGy / s.

[0113] Then, sintering the prepared composite preform at 1200℃ for 3h to obtain a ceramic-metal composite finished product.

[0114] Example 6

[0115] The embodiment of the present application provides a preparation method of a ceramic-metal composite, which is only different from the embodiment 1 in that the crosslinking and infusibilizing treatment is not performed.

[0116] Comparative example 1

[0117] The embodiment of the present application provides a preparation method of a ceramic-metal composite, which comprises the following steps:

[0118] Taking 15% epoxy acrylate resin, 5% viscosity regulator styrene, 5% 819 ultraviolet light initiator, 5% iron powder, 65% alumina ceramic powder and 5% sintering aid by mass percentage; adding the styrene, 819 ultraviolet light initiator, iron powder and alumina ceramic powder into the epoxy acrylate resin in sequence, and stirring under ultrasonic assistance for 30 minutes, and then vacuum degassing after uniform stirring to obtain a ceramic liquid for 3D printing of laser deposition forming.

[0119] The ceramic liquid for 3D printing of laser deposition forming is added into a needle-cylinder printing container of a liquid 3D printer, the ceramic liquid is extruded onto a sample receiving table under air pressure, and is solidified under irradiation of a laser light source to obtain a green body; the 3D morphology of the green body is controlled by three-dimensional movement of the sample receiving table.

[0120] The printed green body is placed into a sintering furnace, sintered at 1600℃ in a nitrogen atmosphere to obtain a ceramic part.

[0121] Comparative example 2

[0122] The embodiment of the present application provides a preparation method of a ceramic-metal composite, which comprises the following steps:

[0123] The polycarbosilane binder and the 304L stainless steel powder were mixed in a mixer at a weight ratio of 1:2 at a temperature of 90°C for 1.5h to form a uniform feedstock; the feedstock was injected into a molding machine at a temperature of 140°C and a pressure of 120MPa to form a metal matrix composite forming blank of a desired shape; the obtained blank was sintered in a vacuum atmosphere at a temperature of 1370°C, with a heating rate of 100°C / h and a holding time of 2h to obtain a nanoscale ceramic-metal composite material.

[0124] Test Example 1

[0125] Porosity test of ceramic-metal composite material

[0126] Test method:

[0127] According to the preparation methods of Examples 1-6 and Comparative Example 1, respectively, ceramic-metal composite materials were prepared, and then the prepared ceramic-metal composite materials were numbered, and then the porosities of each sample were tested.

[0128] Table 1 Porosity results of ceramic-metal composite materials

[0129]

[0130]

[0131] Referring to Table 1, from the test structures of Examples 1-5 and Comparative Example 1, it can be seen that, compared with the conventional 3D printing preparation process, the ceramic-metal composite material prepared by the preparation method provided in the embodiments has a lower porosity.

[0132] Referring to Table 1, from the test structures of Examples 1-5 and Comparative Example 2, it can be seen that, compared with the conventional ceramic precursor preparation process, the ceramic-metal composite material prepared by the preparation method provided in the embodiments has a lower porosity.

[0133] From the test results of Examples 1-5 and Example 6, it can be seen that, in the preparation process of the composite material preform, compared with not performing cross-linking and non-fusion treatment on the mixed slurry, the ceramic-metal composite material prepared by the cross-linking and non-fusion treatment has a lower porosity.

[0134] The above-described embodiments are part of the embodiments of the present application, rather than all the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

Claims

1. A method for producing a ceramic-metal composite material, characterized by, The method comprises the following steps: heating and mixing the ceramic precursor and the metal powder to obtain a mixed slurry; preparing a composite material preform from the mixed slurry by using an inkjet 3D printing technology; and sintering the composite material preform to obtain a ceramic-metal composite material; the ceramic precursor comprises one or more of polycarbosilane, polysilazane and polyborazane; the solid phase content in the mixed slurry is 10-60%; in the step of heating and mixing the ceramic precursor and the metal powder, the processing temperature is 150-250℃; in the step of preparing the composite material preform from the mixed slurry by using the inkjet 3D printing technology, the pressure of the nozzle is 0.1-1MPa.

2. The method of producing a ceramic-metal composite material according to claim 1, characterized by, the metal powder comprises one or more of aluminum powder, copper powder and nickel powder.

3. The method of producing a ceramic-metal composite according to claim 1 or 2, characterized in that, in the step of heating and mixing the ceramic precursor and the metal powder, the processing time is 1-3h.

4. The method of producing a ceramic-metal composite material according to claim 1 or 2, characterized by, in the step of preparing the composite material preform from the mixed slurry by using the inkjet 3D printing technology, the step further comprises a step of cross-linking and non-fusion treatment of the mixed slurry after passing through the nozzle and being condensed and solidified.

5. The method of producing a ceramic-metal composite material according to claim 4, characterized by, in the step of cross-linking and non-fusion treatment, the step comprises the following steps: irradiating the mixed slurry after passing through the nozzle and being condensed and solidified by using an irradiation beam.

6. The method of producing a ceramic-metal composite material according to claim 5, characterized by, the irradiation beam comprises one or more of high-energy electron beam, γ-ray and high-energy neutron beam.

7. The method of producing a ceramic-metal composite according to claim 6, characterized by, in the step of cross-linking and non-fusion treatment, the emission dose rate of the irradiation generator is 10-20kGy / s.

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