CN115921849A - Spherical Al 3 BC/Al composite powder and preparation method thereof - Google Patents
Spherical Al 3 BC/Al composite powder and preparation method thereof Download PDFInfo
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Abstract
Aiming at the requirements of coating materials and additive manufacturing industries, the invention provides spherical Al 3 The BC/Al composite powder is characterized by comprising aluminum or aluminum alloy and Al 3 BC particle composition, al 3 The BC particles are autogenous in situ and have a size of20nm to 500nm based on 100wt% of the Al 3 BC/Al composite powder, al 3 The content of BC particles is 5.0wt% -60.0 wt%. Simultaneously provides Al 3 The preparation method of the BC/Al composite powder has simple preparation process and is suitable for industrial production.
Description
Technical Field
The invention belongs to the technical field of powder materials, and particularly relates to spherical Al 3 BC/Al composite powder and a preparation method thereof.
Background
Al 3 The BC/Al composite material has excellent mechanical property, is expected to be applied to various occasions as a structural material, and is widely concerned by scholars at home and abroad. However, al produced at present 3 The BC/Al composite materials are all blocksComposite material, not yet having Al 3 The BC/Al composite powder and the report related to the preparation method thereof greatly limit the development and application of the BC/Al composite powder in the coating material and additive manufacturing industries.
The invention patent with publication number CN104120310A discloses a nano Al 3 BC and submicron Al 4 C 3 A particle reinforced aluminum matrix composite and a preparation method thereof. The invention patent with publication number CN111378861A discloses an in-situ synthesis method of Al with nano-micro mixed size 3 BC-AlB 2 A preparation method of a dual-phase particle reinforced aluminum matrix composite. The above patents are all directed to Al-containing 3 Method for preparing block aluminum-based composite material of BC particles and Al removal 3 The BC particles contain other second phase particles in addition.
At present for Al 3 BC/Al composite powder and preparation method thereof, in particular to spherical Al suitable for coating material or additive manufacturing 3 BC/Al composite powder and a preparation method thereof are not reported in a public way. Therefore, the present invention provides a spherical Al in response to the technical requirement 3 BC/Al composite powder and provides a preparation method which is simple in process and suitable for batch production.
Disclosure of Invention
An object of the present invention is to provide a spherical Al 3 BC/Al composite powder. Another object of the present invention is to provide a spherical Al which is suitable for industrial production and has a simple process 3 A method for preparing BC/Al composite powder.
According to an aspect of the present invention, there is provided a spherical Al 3 BC/Al composite powder. The spherical Al 3 The BC/Al composite powder consists of aluminum or aluminum alloy and Al 3 BC particle composition, al 3 BC particles are in-situ synthesized with a size of 20nm to 500nm based on 100wt% of the Al 3 BC/Al composite powder, al 3 The content of BC particles is 5.0-60.0 wt%.
According to another aspect of the present invention, there is provided a spherical Al 3 The preparation method of the BC/Al composite powder comprises the following steps:
(1) Preparing raw materials, wherein the raw materials comprise aluminum or aluminum alloy powder, boron body powder and carbon body powder;
(2) Mixing the raw materials according to a certain proportion, and then carrying out ball milling treatment;
(3) Heating the ball-milled powder in a vacuum furnace to a certain temperature and preserving heat for a certain time, and preparing Al through in-situ reaction 3 BC to obtain Al 3 BC/Al composite powder;
(4) Mixing the above Al 3 Mixing BC/Al composite powder and a solvent according to a certain proportion, adding the mixture into a ball mill, adding a certain amount of binder, and obtaining Al after wet grinding uniformly 3 BC/Al composite powder slurry;
(5) Mixing the above Al 3 Spray granulation is carried out on BC/Al composite powder slurry to obtain spherical Al 3 BC/Al composite powder;
(6) Mixing the spherical Al 3 After the BC/Al composite powder is calcined at low temperature and binder removal is carried out, high-temperature calcination is carried out to obtain compact Al 3 BC/Al composite powder;
(7) For the above Al 3 Screening the BC/Al composite powder to obtain Al with a certain particle size range 3 BC/Al composite powder.
Optionally, the content of the boron plastid powder is 0.5wt% to 8.0wt%, the content of the carbon plastid powder is 0.5wt% to 7.2wt%, and the balance is aluminum or aluminum alloy powder, based on 100wt% of the raw material.
Optionally, the boroplastid powder comprises B 4 C and one or two of boron powder, wherein the carbon plastid powder comprises one or more of graphite powder, carbon black and carbon fiber; the average particle diameter of the boron body powder<5 μm, the average particle diameter of the carbonaceous powder<5 μm, the average particle diameter of the aluminum or aluminum alloy powder<10μm。
Optionally, in the step (2), the rotating speed of the ball mill is 180r/min to 360r/min, the ball-to-material ratio is 5:1 to 10, and the ball milling time is 1h to 16h.
Optionally, in the step (3), the heating temperature is 700-900 ℃, and the heat preservation time is 0.5-5 h.
Optionally, the solvent for wet grinding in step (4) is one of deionized water or alcohol, and Al 3 The solid-to-liquid ratio of the BC/Al composite powder to the solvent is 20 to 30 weight percent(ii) a The binder is one of polyvinyl alcohol and polyethylene glycol, and the addition amount of the binder is 1-2 wt% of the solid powder.
Optionally, the particle size of the slurry in the step (4) after ball milling is 1 μm to 5 μm.
Optionally, al obtained by spray granulation in the step (5) 3 The grain diameter of the BC/Al composite powder is 10-100 mu m.
Optionally, the low-temperature calcination temperature in the step (6) is 400-550 ℃, and the heat preservation time is 0.5-5 h; the high-temperature calcination temperature is 600-700 ℃, and the heat preservation time is 1-10 h.
Compared with the prior art, the invention has the following beneficial effects.
Al of the invention 3 Al in BC/Al composite powder 3 The BC particles are self-generated in situ, and the size, the shape and the content of the BC particles are controllable. Al (Al) 3 The size of BC particles is 20-500 nm, the particle size is fine, and the Al is favorably exerted 3 The reinforcing effect of the BC particles and the like; al (aluminum) 3 The content range of BC particles is wide, can be adjusted within the range of 5.0wt% -60.0 wt%, and can meet different performance requirements according to actual use requirements.
Al according to the invention 3 The preparation method of BC/Al composite powder comprises B 4 C and one or two of boron powder, wherein the carbon plastid powder comprises one or more of graphite powder, carbon black and carbon fiber. Wide selectivity of raw materials, adjustable raw material variety and adjustable Al 3 BC particle microstructure.
Al according to the invention 3 Method for producing BC/Al composite powder having boron body powder with average particle diameter<5 μm, average particle diameter of carbonaceous powder<5 μm, average particle size of aluminum or aluminum alloy powder<10 μm. Smaller powder size is beneficial to reducing Al 3 BC in-situ synthesis reaction activation energy to promote Al 3 BC is synthesized in situ and is also the basis for subsequent spray granulation.
Al according to the invention 3 According to the preparation method of the BC/Al composite powder, after the ball milling in the step (2) is finished, partial alloying among raw material powder is realized, and the raw material is reducedThe distance between the raw material powder improves the energy of the raw material powder and promotes the raw material powder to generate in-situ reaction to synthesize Al 3 BC, and Al can be realized by adjusting the ball milling process parameters 3 And regulating and controlling the size and distribution of BC particles.
Al according to the invention 3 The preparation method of the BC/Al composite powder comprises the step (4) of carrying out in-situ preparation on the Al 3 Wet grinding the BC/Al composite powder to obtain composite powder slurry, wherein the particle size of particles in the slurry after ball milling is 1-5 mu m, and the finely dispersed composite powder slurry is an important prerequisite for next spray milling.
Al according to the invention 3 The preparation method of the BC/Al composite powder comprises the step (5) of mixing Al with the mixture 3 Spray granulating and drying the BC/Al composite powder slurry to obtain Al with good sphericity and uniform size distribution 3 BC/Al composite powder, spherical Al 3 The BC/Al composite powder has excellent fluidity and can be suitable for additive manufacturing and coating preparation.
Al according to the invention 3 In the preparation method of the BC/Al composite powder, the binder, the dispersant and the like added in the wet grinding process are removed after the low-temperature calcination in the step (6), and the high-temperature calcination process aims to densify the powder obtained by granulation, so that the Al with good sphericity, uniform size distribution and dense powder is finally obtained 3 BC/Al composite powder.
Drawings
The above and other aspects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is Al 3 The macroscopic microstructure of the BC/Al composite powder;
FIG. 2 is Al 3 High power microscopic structure of BC/Al composite powder;
FIG. 3 is Al 3 XRD pattern of BC/Al composite powder.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments and accompanying drawings.
This disclosure may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It will be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated materials and/or ingredients, but do not preclude the presence or addition of one or more other materials and/or ingredients.
FIG. 1 shows a spherical Al prepared according to the present invention 3 The low-power microstructure of the BC/Al composite powder can show that the composite powder has good sphericity. FIG. 2 shows Al 3 The high-power microstructure of the BC/Al composite powder can be seen that the composite powder is made of aluminum or aluminum alloy and Al 3 BC particles. FIG. 3 shows Al prepared in this example 3 XRD analysis result of BC/Al composite powder also proves that the phase composition is Al and Al 3 BC。Al 3 The BC particles are in-situ self-generated in the preparation process, have the size of 20-500 nm and are based on 100wt% of the Al 3 BC/Al composite powder, al 3 The content of BC particles is 5.0-60.0 wt%.
According to an embodiment of the present invention, al of the present invention 3 The preparation method of the BC/Al composite powder comprises the following steps:
(1) Preparing raw materials, wherein the raw materials comprise aluminum or aluminum alloy powder, boron body powder and carbon body powder;
specifically, the content of the boron powder is preferably 0.5 to 8.0wt%, the content of the carbon powder is preferably 0.5 to 7.2wt%, and the balance is aluminum or aluminum alloy powder, based on 100wt% of the raw material;
preferably, the boron plastid powder comprises B 4 C and one or two of boron powder, wherein the carbon plastid powder comprises one or more of graphite powder, carbon black and carbon fiber; the average particle diameter of the boron powder<5 μm, the average particle diameter of the carbonaceous powder<5 μm, average particle diameter of the aluminum or aluminum alloy powder<10μm；
(2) Mixing the raw materials according to a certain proportion, and then carrying out ball milling treatment;
specifically, the rotating speed of the ball mill in the step is 180 r/min-360 r/min, the ball-material ratio is 5:1-10, and the ball milling time is 1-16 h;
(3) Heating the ball-milled powder in a vacuum furnace to a certain temperature and preserving heat for a certain time, and preparing Al through in-situ reaction 3 BC to obtain Al 3 BC/Al composite powder;
specifically, the heating temperature in the step is 700-900 ℃, and the heat preservation time is 0.5-5 h;
(4) Mixing the above Al 3 Mixing BC/Al composite powder with a solvent, adding the mixture into a ball mill according to a certain proportion, adding a certain amount of binder, and obtaining Al after wet grinding uniformly 3 BC/Al composite powder slurry;
specifically, the solvent for wet grinding in the step is one of water or alcohol, and Al 3 The solid-liquid ratio of the BC/Al composite powder to the solvent is 20 to 30 weight percent; the binder is one of polyvinyl alcohol and polyethylene glycol, and the addition amount of the binder is 1-2 wt% of the solid powder;
preferably, the particle size of the slurry obtained after the step is 1-5 μm;
(5) Mixing the above Al 3 Carrying out spray granulation on the BC/Al composite powder slurry to obtain spherical Al 3 BC/Al composite powder;
specifically, al obtained by spray granulation 3 The grain diameter of the BC/Al composite powder is 10-100 mu m;
(6) Mixing the spherical Al 3 After the BC/Al composite powder is calcined at low temperature for binder removal, the high-temperature calcination is carried out to obtain compact Al 3 BC/Al composite powder;
specifically, the low-temperature calcination temperature in the step is 400-550 ℃, and the heat preservation time is 0.5-5 h; the high-temperature calcination temperature is 600-700 ℃, and the heat preservation time is 1-10 h;
(7) For the above Al 3 Screening the BC/Al composite powder to obtain Al with a certain particle size range 3 BC/Al composite powder.
Hereinafter, al according to an embodiment of the present invention will be described 3 Specific examples of the preparation method of BC/Al composite powder.
Example 1
(1) Preparing raw materials including aluminum powder and B 4 C powder and graphite powder, B 4 2.0wt% of C powder, 1.3wt% of graphite powder and the balance of aluminium powder 4 The average grain diameter of the C powder is 1.5 mu m, the average grain diameter of the graphite powder is 2 mu m, and the average grain diameter of the aluminum powder is 5 mu m;
(2) Mixing the raw materials in proportion, and performing ball milling treatment, wherein the rotating speed of a ball mill is 200r/min, the ball-to-material ratio is 7:1, and the ball milling time is 4 hours;
(3) Heating the ball-milled powder to 750 ℃ in a vacuum furnace, preserving heat for 2 hours, and preparing Al through in-situ reaction 3 BC to obtain Al 3 BC/Al composite powder;
(4) Mixing the above Al 3 Mixing BC/Al composite powder with deionized water according to a solid-to-liquid ratio of 25%, adding into a ball mill, adding 1wt% of polyvinyl alcohol as a binder, and carrying out wet milling uniformly to obtain Al 3 BC/Al composite powder slurry, wherein the particle size of particles in the slurry is 1-5 mu m;
(5) Mixing the above Al 3 Spray granulating the BC/Al composite powder slurry to obtain spherical Al with the granularity of 10-50 mu m 3 BC/Al composite powder;
(6) Mixing the spherical Al 3 Calcining the BC/Al composite powder at 450 ℃ for 3h to remove the binder, raising the temperature to 650 ℃ and calcining for 2h to obtain compact Al 3 BC/Al composite powder;
(7) For the above Al 3 Screening the BC/Al composite powder to obtain spherical Al with the grain diameter range of 10-50 mu m 3 BC/Al composite powder;
al prepared according to the process 3 Al in BC/Al composite powder 3 BC particle content of 15wt%, al 3 BC particle size<200nm。
Example 2
(1) Preparing raw materials comprising aluminum powder, boron powder and graphite powder, wherein the content of the boron powder is 6.0wt%, the content of the graphite powder is 7.2wt%, and the balance is the aluminum powder, the average particle size of the boron powder is 2 micrometers, the average particle size of the graphite powder is 2 micrometers, and the average particle size of the aluminum powder is 5 micrometers;
(2) Mixing the raw materials in proportion, and performing ball milling treatment, wherein the rotating speed of a ball mill is 360r/min, the ball-material ratio is 10;
(3) Heating the ball-milled powder to 900 ℃ in a vacuum furnace, preserving heat for 5 hours, and preparing Al through in-situ reaction 3 BC to obtain Al 3 BC/Al composite powder;
(4) Mixing the above Al 3 Mixing BC/Al composite powder with deionized water according to a solid-to-liquid ratio of 20%, adding into a ball mill, adding 2wt% of polyvinyl alcohol as a binder, and wet-milling uniformly to obtain Al 3 BC/Al composite powder slurry, wherein the particle size of particles in the slurry is 1-5 mu m;
(5) Mixing the above Al 3 Spray granulating the BC/Al composite powder slurry to obtain spherical Al with the granularity of 10-50 mu m 3 BC/Al composite powder;
(6) Mixing the spherical Al 3 Calcining the BC/Al composite powder at 450 ℃ for 4h to remove the binder, raising the temperature to 650 ℃ and calcining for 10h to obtain compact Al 3 BC/Al composite powder;
(7) For the above Al 3 Screening the BC/Al composite powder to obtain spherical Al with the grain diameter range of 10-50 mu m 3 BC/Al composite powder;
al prepared according to the process 3 Al in BC/Al composite powder 3 BC particle content of 60wt%, al 3 BC particle size<300nm。
Example 3
(1) Preparing raw materials including aluminum powder and B 4 C powder and carbon black powder, B 4 8.0wt% of C powder, 5.2wt% of carbon black powder and the balance of aluminum powder and B powder 4 The average grain diameter of the C powder is 1.5 mu m, the average grain diameter of the carbon black powder is 2 mu m, and the average grain diameter of the aluminum powder is 5 mu m;
(2) Mixing the raw materials in proportion, and then carrying out ball milling treatment, wherein the rotating speed of a ball mill is 360r/min, the ball material ratio is 10;
(3) Heating the ball-milled powder to 900 ℃ in a vacuum furnace, preserving heat for 5 hours, and preparing Al through in-situ reaction 3 BC to obtain Al 3 BC/Al composite powder;
(4) Mixing the above Al 3 Mixing the BC/Al composite powder with deionized water according to the solid-to-liquid ratio of 20 percent, adding the mixture into a ball mill, and adding 2 weight percent of polyethylene glycolIs used as a binder, and Al is obtained after wet grinding 3 BC/Al composite powder slurry, wherein the particle size of particles in the slurry is 1-5 mu m;
(5) Mixing the above Al 3 Spray granulating the BC/Al composite powder slurry to obtain spherical Al with the granularity of 20-100 mu m 3 BC/Al composite powder;
(6) Mixing the spherical Al 3 Calcining the BC/Al composite powder at 400 ℃ for 5h to remove the binder, raising the temperature to 700 ℃ and calcining for 5h to obtain compact Al 3 BC/Al composite powder;
(7) For the above Al 3 Screening the BC/Al composite powder to obtain spherical Al with the particle size range of 20-100 mu m 3 BC/Al composite powder;
al prepared according to the process 3 Al in BC/Al composite powder 3 BC particle content of 60wt%, al 3 BC particle size<500nm。
Example 4
(1) Preparing raw materials comprising 7050 aluminum alloy powder, boron powder and carbon black powder, wherein the content of the boron powder is 2.6wt%, the content of the carbon black powder is 2.9wt%, and the balance is aluminum powder, the average particle size of the boron powder is 2 micrometers, the average particle size of the carbon black powder is 2 micrometers, and the average particle size of the 7050 aluminum alloy powder is 5 micrometers;
(2) Mixing the raw materials in proportion, and performing ball milling treatment, wherein the rotating speed of a ball mill is 200r/min, the ball-to-material ratio is 7:1, and the ball milling time is 5 hours;
(3) Heating the ball-milled powder to 750 ℃ in a vacuum furnace, preserving heat for 2 hours, and preparing Al by in-situ reaction 3 BC to obtain Al 3 BC/7050Al composite powder;
(4) Mixing the above Al 3 Mixing BC/7050Al composite powder with alcohol according to a solid-to-liquid ratio of 25%, adding into a ball mill, adding 1wt% of polyethylene glycol as a binder, and carrying out wet milling uniformly to obtain Al 3 BC/7050Al composite powder slurry, the particle size of the slurry is 1-5 μm;
(5) Mixing the above Al 3 Spray granulating the BC/7050Al composite powder slurry to obtain spherical Al with the granularity of 10-50 mu m 3 BC/Al composite powder;
(6) Mixing the spherical Al 3 The BC/7050Al composite powder is carried out at 500 DEG CCalcining for 2h to remove the binder, raising the temperature to 650 ℃ and calcining for 2h to obtain compact Al 3 BC/7050Al composite powder;
(7) For the above Al 3 Screening the BC/7050Al composite powder to obtain spherical Al with the grain diameter range of 10-50 mu m 3 BC/7050Al composite powder;
al prepared according to the process 3 Al in BC/7050Al composite powder 3 BC particle content of 25wt%, al 3 BC particle size<200nm。
Example 5
(1) Preparing raw materials including 2024 aluminum alloy powder and B 4 C and carbon fiber powder, B 4 3.3wt% of C, 2.1wt% of carbon fiber powder and the balance of aluminum powder and B 4 The average grain diameter of C is 1.5 mu m, the average grain diameter of carbon fiber powder is 5 mu m, and the average grain diameter of 2024 aluminum alloy powder is 5 mu m;
(2) Mixing the raw materials in proportion, and performing ball milling treatment, wherein the rotating speed of a ball mill is 200r/min, the ball-material ratio is 10;
(3) Heating the ball-milled powder to 750 ℃ in a vacuum furnace, preserving heat for 2 hours, and preparing Al through in-situ reaction 3 BC to obtain Al 3 BC/2024Al composite powder;
(4) Mixing the above Al 3 Mixing BC/2024Al composite powder with alcohol according to a solid-to-liquid ratio of 25%, adding into a ball mill, adding 1wt% of polyvinyl alcohol as a binder, and carrying out wet milling uniformly to obtain Al 3 BC/2024Al composite powder slurry, wherein the particle size of particles in the slurry is 1-5 μm;
(5) Mixing the above Al 3 Spray granulating the BC/2024Al composite powder slurry to obtain spherical Al with the granularity of 10-50 mu m 3 BC/2024Al composite powder;
(6) Mixing the spherical Al 3 Calcining BC/2024Al composite powder at 500 ℃ for 2h to remove glue, raising the temperature to 650 ℃ and calcining for 2h to obtain compact Al 3 BC/2024Al composite powder;
(7) For the above Al 3 Screening the BC/2024Al composite powder to obtain spherical Al with the particle size range of 10-50 mu m 3 BC/2024Al composite powder;
according to the processPrepared Al 3 Al in BC/2024Al composite powder 3 BC particle content of 25wt%, al 3 BC particle size<200nm。
Example 6
(1) Preparing raw materials comprising aluminum powder, boron powder and graphite powder, wherein the content of the boron powder is 0.5wt%, the content of the graphite powder is 0.6wt%, and the balance is the aluminum powder, the average particle size of the boron powder is 4 micrometers, the average particle size of the graphite powder is 4 micrometers, and the average particle size of the aluminum powder is 9 micrometers;
(2) Mixing the raw materials in proportion, and performing ball milling treatment, wherein the rotating speed of a ball mill is 180r/min, the ball-to-material ratio is 5:1, and the ball milling time is 2 hours;
(3) Heating the ball-milled powder to 700 ℃ in a vacuum furnace, preserving heat for 0.5h, and preparing Al through in-situ reaction 3 BC to obtain Al 3 BC/Al composite powder;
(4) Mixing the above Al 3 Mixing BC/Al composite powder with deionized water according to a solid-to-liquid ratio of 30%, adding the mixture into a ball mill, adding 1wt% of polyvinyl alcohol serving as a binder, and wet-grinding uniformly to obtain Al 3 BC/Al composite powder slurry, wherein the particle size of particles in the slurry is 1-5 mu m;
(5) Mixing the above Al 3 Spray granulating the BC/Al composite powder slurry to obtain spherical Al with the granularity of 10-50 mu m 3 BC/Al composite powder;
(6) Mixing the spherical Al 3 Calcining the BC/Al composite powder at 500 ℃ for 2h for binder removal, raising the temperature to 600 ℃ for calcining for 1h to obtain compact Al 3 BC/Al composite powder;
(7) For the above Al 3 Screening the BC/Al composite powder to obtain spherical Al with the grain diameter range of 10-50 mu m 3 BC/Al composite powder;
al prepared according to the process 3 Al in BC/Al composite powder 3 BC particle content of 5wt%, al 3 BC particle size<200nm。
Example 7
(1) Preparing raw materials including aluminum powder and B 4 C powder and graphite powder, B 4 0.8wt% of C powder, 0.5wt% of graphite powder and the balance of aluminum powder and B powder 4 The average grain diameter of C powder is 1.5 μm, and the average particle diameter of graphite powder isThe grain diameter is 2 mu m, and the average grain diameter of the aluminum powder is 5 mu m;
(2) Mixing the raw materials in proportion, and performing ball milling treatment, wherein the rotating speed of a ball mill is 180r/min, the ball-to-material ratio is 7:1, and the ball milling time is 1h;
(3) Heating the ball-milled powder to 700 ℃ in a vacuum furnace, preserving heat for 0.5h, and preparing Al through in-situ reaction 3 BC to obtain Al 3 BC/Al composite powder;
(4) Mixing the above Al 3 Mixing BC/Al composite powder with deionized water according to a solid-to-liquid ratio of 30%, adding the mixture into a ball mill, adding 1wt% of polyvinyl alcohol serving as a binder, and wet-grinding uniformly to obtain Al 3 BC/Al composite powder slurry, wherein the particle size of particles in the slurry is 1-5 mu m;
(5) Mixing the above Al 3 Spray granulating the BC/Al composite powder slurry to obtain spherical Al with the granularity of 10-50 mu m 3 BC/Al composite powder;
(6) Mixing the spherical Al 3 Calcining the BC/Al composite powder at 550 ℃ for 0.5h to remove glue, raising the temperature to 600 ℃ and calcining for 1h to obtain compact Al 3 BC/Al composite powder;
(7) For the above Al 3 Screening the BC/Al composite powder to obtain spherical Al with the grain diameter range of 10-50 mu m 3 BC/Al composite powder;
al prepared according to the process 3 Al in BC/Al composite powder 3 BC particle content of 6wt%, al 3 BC particle size<200nm。
Claims (10)
1. Spherical Al 3 The BC/Al composite powder is characterized by comprising aluminum or aluminum alloy and Al 3 BC particle composition, al 3 BC particles are autogenous in situ, have a size of 20-500 nm, based on 100wt% of the spherical Al 3 BC/Al composite powder, al 3 The content of BC particles is 5.0-60.0 wt%.
2. Spherical Al according to claim 1 3 The preparation method of the BC/Al composite powder is characterized by comprising the following steps:
(1) Preparing raw materials, wherein the raw materials comprise aluminum or aluminum alloy powder, boron body powder and carbon body powder;
(2) Mixing the raw materials according to a certain proportion, and then carrying out ball milling treatment;
(3) Heating the ball-milled powder in a vacuum furnace to a certain temperature, preserving the temperature for a certain time, and preparing Al by in-situ reaction 3 BC to obtain Al 3 BC/Al composite powder;
(4) Mixing the above Al 3 Mixing the BC/Al composite powder with a solvent according to a certain proportion, adding the mixture into a ball mill, adding a certain amount of binder, and wet-grinding the mixture uniformly to obtain Al 3 BC/Al composite powder slurry;
(5) Mixing the above Al 3 Carrying out spray granulation on the BC/Al composite powder slurry to obtain spherical Al 3 BC/Al composite powder;
(6) Mixing the spherical Al 3 After the BC/Al composite powder is calcined at low temperature and binder removal is carried out, high-temperature calcination is carried out to obtain compact Al 3 BC/Al composite powder;
(7) For the spherical Al 3 Screening the BC/Al composite powder to obtain Al with a certain particle size range 3 BC/Al composite powder.
3. A spherical Al according to claim 2 3 The preparation method of the BC/Al composite powder is characterized in that based on 100wt% of raw materials, the content of the boron plastid powder is 0.5wt% -8.0 wt%, the content of the carbon plastid powder is 0.5wt% -7.2 wt%, and the balance is aluminum or aluminum alloy powder.
4. A spherical Al according to claim 2 3 The preparation method of the BC/Al composite powder is characterized in that the boron body powder comprises B 4 C and one or two of boron powder, wherein the carbon plastid powder comprises one or more of graphite powder, carbon black and carbon fiber; the average particle diameter of the boron powder<5 μm, the average particle diameter of the carbonaceous powder<5 μm, average particle diameter of the aluminum or aluminum alloy powder<10μm。
5. A ball according to claim 2Form Al 3 The preparation method of the BC/Al composite powder is characterized in that in the step (2), the rotating speed of a ball mill is 180 r/min-360 r/min, the ball-material ratio is 5:1-10, and the ball milling time is 1-16 h.
6. A spherical Al according to claim 2 3 The preparation method of the BC/Al composite powder is characterized in that the heating temperature in the step (3) is 700-900 ℃, and the heat preservation time is 0.5-5 h.
7. A spherical Al according to claim 2 3 The preparation method of the BC/Al composite powder is characterized in that the wet-grinding solvent in the step (4) is one of deionized water or alcohol, and Al 3 The solid-liquid ratio of the BC/Al composite powder to the solvent is 20 to 30 weight percent; the binder is one of polyvinyl alcohol and polyethylene glycol, and the addition amount of the binder is 1-2 wt% of the solid powder.
8. A spherical Al according to claim 2 3 The preparation method of the BC/Al composite powder is characterized in that the particle size of the slurry in the step (4) after ball milling is 1-5 μm.
9. A spherical Al according to claim 2 3 The preparation method of the BC/Al composite powder is characterized in that the Al obtained by spray granulation in the step (5) 3 The grain diameter of the BC/Al composite powder is 10-100 mu m.
10. A spherical Al according to claim 2 3 The preparation method of the BC/Al composite powder is characterized in that the low-temperature calcination temperature in the step (6) is 400-550 ℃, and the heat preservation time is 0.5-5 h; the high-temperature calcination temperature is 600-700 ℃, and the heat preservation time is 1-10 h.
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| CN202310113753.2A CN115921849B (en) | 2023-02-15 | 2023-02-15 | Spherical Al 3 BC/Al composite powder and preparation method thereof |
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| CN116730723A (en) * | 2023-07-26 | 2023-09-12 | 山东理工大学 | Al (aluminum) alloy 3 BC ceramic material and preparation method and application thereof |
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