CN111960827B - Multi-element BCN-series high-entropy ceramic powder and preparation method thereof - Google Patents
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Abstract
The invention provides a multi-BCN-series high-entropy ceramic powder and a preparation method thereof, relating to the technical field of ceramic powder materials, wherein the preparation method of the multi-BCN-series high-entropy ceramic powder comprises the following steps: the multi-element BCN series high-entropy ceramic powder is obtained by uniformly mixing the non-metal ceramic powder with the transition metal and then carrying out high-energy ball milling. Compared with the prior art, the preparation method of the multi-element BCN series high-entropy ceramic powder is simple to operate, the high-entropy ceramic powder with a single-phase face-centered cubic structure can be prepared at normal temperature, the step of high-temperature treatment required by other preparation processes is avoided, the grain size is 5-20nm, the powder purity is high, and the thermal stability is high, wherein the single-phase solid solution structure with fine grains can be still maintained by the four-element and five-element high-entropy ceramic powder after heat preservation for 30min at 1300 ℃.
Description
Technical Field
The invention relates to the technical field of ceramic powder materials, in particular to a multi-element BCN-series high-entropy ceramic powder and a preparation method thereof.
Background
High-entropy ceramics can be roughly divided into five types, namely high-entropy oxides, high-entropy carbides, high-entropy diborides, high-entropy nitrides and high-entropy disilicides, recently, high-entropy ceramics (B, N or B, C or C, N) with two non-metals are prepared, at present, the preparation of high-entropy ceramic powder adopts a powder preparation mode of physically mixing several ceramic phases, the obtained powder is a mixture, the single-phase transformation of the powder is carried out in the sintering process, and the sintering temperature is generally higher than 1800 ℃. In another mode, high-entropy powder is obtained by utilizing a carbon/boron thermal reduction reaction at a high temperature, the experimental temperature is over 1000 ℃, the experimental conditions are high, the operation steps are complex, and the stability of the obtained high-entropy powder is low.
Disclosure of Invention
The invention solves the technical problems that the preparation experiment condition of the high-entropy ceramic powder is high, the operation steps are complex, and the stability of the obtained high-entropy powder is low in the prior art.
In order to solve the technical problem, the invention also provides a preparation method of the multi-element BCN series high-entropy ceramic powder, which comprises the following steps: the multi-element BCN series high-entropy ceramic powder is obtained by uniformly mixing the non-metal ceramic powder with the transition metal and then carrying out high-energy ball milling.
Optionally, the preparation method of the multi-element BCN high-entropy ceramic powder comprises the following steps: uniformly mixing the nonmetal ceramic powder, and performing high-energy ball milling to obtain amorphous ceramic powder; and uniformly mixing the amorphous ceramic powder with transition metal, and performing high-energy ball milling to obtain the multi-BCN high-entropy ceramic powder.
Optionally, the preparation method of the multi-element BCN high-entropy ceramic powder comprises the following steps:
step S1, uniformly mixing the h-BN powder and the graphite powder for 5-20h on a mixer in a protective atmosphere according to the molar ratio of 0.5-2:1 to form first premixed powder;
step S2, sieving the first premixed powder, and ball-milling for 5-12h on a high-energy ball mill at the rotating speed of 300-600rpm to obtain amorphous BCN ceramic powder;
step S3, uniformly mixing the amorphous BCN ceramic powder and at least two transition metal powders on a mixer for 10-20h in a protective atmosphere according to the mol ratio of alpha-BCN to M1 to M2 to Mi to 1 to 0.2-2 to form second premixed powder, wherein M1, M2 and Mi respectively refer to different transition metal elements, and i is more than or equal to 2;
and step S4, screening the second premixed powder, and ball-milling the second premixed powder for 1-40h on a high-energy ball mill at the rotating speed of 300-600rpm to obtain the multi-element BCN series high-entropy ceramic powder.
Optionally, the preparation method of the multi-element BCN high-entropy ceramic powder comprises the following steps:
step S1, uniformly mixing the h-BN powder, the graphite powder and the simple substance silicon for 5-10h on a mixer in a molar ratio of 0.5-3:0.5-3:1 under a protective atmosphere to form third premixed powder;
step S2, sieving the third premixed powder, and ball-milling the sieved third premixed powder for 20-40h on a high-energy ball mill at the rotating speed of 300-600rpm to obtain amorphous SiBCN ceramic powder;
step S3, uniformly mixing the amorphous SiBCN ceramic powder and at least one transition metal powder on a mixer for 10-20h in a protective atmosphere according to the mol ratio of alpha-BCN to M1 to M2 to Mi being 1:0.2-2:0.2-2:0.2-2 to form fourth premixed powder, wherein M1, M2 and Mi respectively refer to different transition metal elements, and i is more than or equal to 2;
and step S4, screening the fourth premixed powder, and ball-milling the sieved fourth premixed powder for 1-40h on a high-energy ball mill at the rotating speed of 300-600rpm to obtain the multi-element BCN series high-entropy ceramic powder.
Optionally, the preparation method of the multi-element BCN high-entropy ceramic powder comprises the following steps:
step S1, uniformly mixing h-BN powder, graphite powder, simple substance silicon and three transition metals according to a molar ratio of h-BN to graphite to Si to M1 to M2 to M3 to 1:0.5-3:0.5-3:0.2-2:0.2-2:0.2-2 in a mixer under a protective atmosphere for 5-10h to form fifth premixed powder;
and step S2, screening the fifth premixed powder, and ball-milling the powder for 20-40h on a high-energy ball mill at the rotating speed of 300-600rpm to obtain the multi-element BCN series high-entropy ceramic powder.
Optionally, in the preparation method of the multi-element BCN high-entropy ceramic powder, the transition metal includes at least one transition metal of the fourth, fifth or sixth subgroup.
Optionally, in the preparation method of the multi-element BCN high-entropy ceramic powder, the transition metal includes one or more of tantalum powder, niobium powder, tungsten powder, hafnium powder, zirconium powder, or molybdenum powder.
Optionally, in the preparation method of the multi-element BCN-based high-entropy ceramic powder, in the step S1, the step S2, the step S3 and the step S4, in the ball milling process, the grinding balls are silicon nitride grinding balls, the diameter range of the grinding balls is 8-15mm, and the ball-to-material ratio is 10-20: 1.
Optionally, the method for preparing the multi-element BCN-based high-entropy ceramic powder is characterized in that in the steps S1, S2, S3 and S4, the protective atmosphere is argon.
Compared with the prior art, the preparation method of the multi-element BCN series high-entropy ceramic powder is simple to operate, the high-entropy ceramic powder with a single-phase face-centered cubic structure can be prepared at normal temperature, the step of high-temperature treatment required by other preparation processes is avoided, the grain size is 5-20nm, the powder purity is high, and the thermal stability is high, wherein the single-phase solid solution structure with fine grains can be still maintained by the four-element and five-element high-entropy ceramic powder after heat preservation for 30min at 1300 ℃.
In order to solve the technical problems, the invention also provides the multi-element BCN high-entropy ceramic powder prepared by the preparation method of the multi-element BCN high-entropy ceramic powder, and the multi-element BCN high-entropy ceramic powder is multi-element face-centered cubic single-phase solid solution high-entropy ceramic powder.
Compared with the prior art, the multielement BCN high-entropy ceramic powder has the advantages that the grain size is 5-20nm, the powder purity is high, and the thermal stability is high, wherein the quaternary and quinary high-entropy ceramic powder can still keep a single-phase solid solution structure with fine grains after being kept at 1300 ℃ for 30 min.
Drawings
FIG. 1 is a first flow chart of a method for preparing a multi-element BCN series high-entropy ceramic powder according to an embodiment of the present invention;
FIG. 2 is a flow chart of a second method for preparing a multi-element BCN series high-entropy ceramic powder according to an embodiment of the present invention;
FIG. 3 is a flow chart of a third process for preparing a multi-element BCN series high-entropy ceramic powder according to an embodiment of the present invention;
FIG. 4 is a first XRD spectrum of a multi-element BCN series high-entropy ceramic powder in an embodiment of the present invention;
FIG. 5 is a second XRD spectrum of a multi-element BCN series high-entropy ceramic powder in an embodiment of the present invention;
FIG. 6 is an XRD spectrum III of a multi-element BCN series high-entropy ceramic powder in an embodiment of the present invention;
FIG. 7 is an XRD spectrum IV of a multi-element BCN series high-entropy ceramic powder in an embodiment of the present invention;
FIG. 8 is an XRD spectrum V of a multi-element BCN series high-entropy ceramic powder in an embodiment of the present invention;
FIG. 9 is an XRD spectrum six of a multi-element BCN series high-entropy ceramic powder in an embodiment of the present invention;
FIG. 10 is an XRD spectrum seven of a multi-element BCN series high-entropy ceramic powder in an embodiment of the present invention;
FIG. 11 is an SEM image of multi-element BCN-based high-entropy ceramic powder of different systems in an embodiment of the present invention, wherein a) is a (Ta, Hf, Zr, Si) BCN system; b) is a (Ta, Nb) BCN system; c) is (Ta, Si) BCN system; d) is a (Ta, Hf, Zr, Nb) BCN system; e) is a (Ta, Hf, Zr, Nb, W) BCN system; f) is (Ta, Hf, Zr, Si) BCN system.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the description of the present invention, it is to be understood that the terms "first", "second", "third", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. The description of the term "some specific embodiments" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Throughout this specification, the schematic representations of the terms used above do not necessarily refer to the same implementation or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiment of the invention provides a preparation method of multi-element BCN series high-entropy ceramic powder, which comprises the following steps: the multi-element BCN series high-entropy ceramic powder is obtained by uniformly mixing the non-metal ceramic powder with the transition metal and then carrying out high-energy ball milling.
As shown in fig. 3, in some preferred embodiments, the method for preparing the multi-element BCN-based high-entropy ceramic powder includes the following steps:
step S1, uniformly mixing h-BN powder, graphite powder, simple substance silicon and three transition metals according to a molar ratio of h-BN to graphite to Si to M1 to M2 to M3 to 1:0.5-3:0.5-3:0.2-2:0.2-2:0.2-2 in a mixer under a protective atmosphere for 5-10h to form fifth premixed powder;
and step S2, screening the fifth premixed powder, and ball-milling the powder for 20-40h on a high-energy ball mill at the rotating speed of 300-600rpm to obtain the multi-element BCN series high-entropy ceramic powder. In this embodiment, after silicon is added to the non-metallic ceramic powder, a longer time is required for ball milling to make the particles amorphous.
The embodiment of the invention provides a preparation method of multi-element BCN series high-entropy ceramic powder, which further comprises the following steps: uniformly mixing the nonmetal ceramic powder, and performing high-energy ball milling to obtain amorphous ceramic powder; and uniformly mixing the amorphous ceramic powder with transition metal, and performing high-energy ball milling to obtain the multi-BCN high-entropy ceramic powder.
As shown in fig. 1, in some preferred embodiments, the method for preparing the multi-element BCN-based high-entropy ceramic powder includes the following steps:
step S1, weighing h-BN powder and graphite powder in a glove box according to a molar ratio of 0.5-2:1, then putting the powder into a mixing bottle, and uniformly mixing the powder on a mixer for 5-20 hours under a protective atmosphere to form first premixed powder;
step S2, screening the first premixed powder, and ball-milling the powder for 5-12h on a high-energy ball mill at the rotating speed of 300-600rpm to obtain amorphous BCN ceramic powder;
step S3, uniformly mixing the amorphous BCN ceramic powder and at least two transition metal powders on a mixer for 10-20h under a protective atmosphere according to the mol ratio of BCN to M1 to M2 to Mi to 1 to 0.2-2 to form second premixed powder, wherein M1, M2 and Mi refer to different transition metal elements respectively, and i is more than or equal to 2;
and step S4, screening the second premixed powder, and ball-milling the second premixed powder for 1-40h on a high-energy ball mill at the rotating speed of 300-600rpm to obtain the multi-element BCN series high-entropy ceramic powder.
As shown in fig. 2, in some preferred embodiments, the method for preparing the multi-element BCN-based high-entropy ceramic powder includes the following steps:
step S1, weighing h-BN powder, graphite powder and simple substance silicon in a molar ratio of 0.5-3:0.5-3:1 in a glove box, then putting the weighed materials into a mixing bottle, and uniformly mixing the materials on a mixer for 5-10 hours under a protective atmosphere to form third premixed powder;
step S2, sieving the third premixed powder, and ball-milling the sieved third premixed powder for 20-40h on a high-energy ball mill at the rotating speed of 300-600rpm to obtain amorphous SiBCN ceramic powder;
step S3, uniformly mixing the amorphous SiBCN ceramic powder and at least one transition metal powder for 10-20h on a mixer in a protective atmosphere according to the mol ratio of SiBCN to M1 to M2 to Mi to 1:0.2-2:0.2-2:0.2-2 to form fourth premixed powder, wherein M1, M2 and Mi respectively refer to different transition metal elements, and i is more than or equal to 2;
and step S4, screening the fourth premixed powder, and ball-milling the sieved fourth premixed powder for 1-40h on a high-energy ball mill at the rotating speed of 300-600rpm to obtain the multi-element BCN series high-entropy ceramic powder.
In this embodiment, the transition metal comprises at least one fourth, fifth or sixth transition group metal. In some preferred embodiments, the transition metal includes one or more of tantalum powder, niobium powder, tungsten powder, hafnium powder, zirconium powder, or molybdenum powder, and the ceramic obtained by mixing the transition metal powder with the nonmetal powder and sintering the mixture has high hardness and good high temperature resistance.
Optionally, in the preparation method of the multi-element BCN-based high-entropy ceramic powder, in the steps S1, S2, S3 and S4, in the ball milling process, the grinding balls are silicon nitride grinding balls, the diameter range of the grinding balls is 8-15mm, and the ball-to-material ratio is 10-20:1, so that the mixing is more uniform.
In some preferred embodiments, the method for preparing the multi-element BCN-based high-entropy ceramic powder is characterized in that in the step S1, the step S2, the step S3 and the step S4, the protective atmosphere is argon, and raw materials are easily available.
Compared with the prior art, the preparation method of the multi-element BCN series high-entropy ceramic powder is simple to operate, the high-entropy ceramic powder with the single-phase face-centered cubic structure can be prepared at normal temperature, and the step that other preparation processes need high-temperature treatment is avoided.
In order to solve the technical problems, the invention also provides the multi-element BCN high-entropy ceramic powder prepared by the preparation method of the multi-element BCN high-entropy ceramic powder, and the multi-element BCN high-entropy ceramic powder is multi-element face-centered cubic single-phase solid solution high-entropy ceramic powder.
Compared with the prior art, the grain size of the multi-element BCN high-entropy ceramic powder is 5-20nm, other substances are not introduced in the whole preparation process, the formed high-entropy ceramic powder is high in purity, and meanwhile, the high-entropy ceramic powder has a single-phase solid solution structure, is attached with high entropy property and has higher thermal stability, wherein the single-phase solid solution structure with fine grains can be still maintained by the four-element and five-element high-entropy ceramic powder after the temperature is kept at 1300 ℃ for 30min, and the stability is higher.
Example 1
The embodiment provides a preparation method of multi-element BCN series high-entropy ceramic powder, which comprises the following steps:
step S1, filling 11.46g of h-BN powder and 5.54g of graphite powder into a mixing bottle in a glove box, and uniformly mixing for 5h on a mixer under argon atmosphere to form first premixed powder, wherein the diameter of a silicon nitride grinding ball used for ball milling is 8mm, and the ball-to-material ratio is 10: 1;
step S2, putting the first premixed powder 17g and the silicon nitride grinding balls into a ball milling tank with the mass ratio of 1:20, and carrying out ball milling on the first premixed powder for 10 hours on a high-energy ball mill at the rotating speed of 350rpm to obtain amorphous BCN ceramic powder, as shown in figure 4;
step S3, sieving the amorphous BCN ceramic powder with a 200-mesh sieve in a glove box, and uniformly mixing the amorphous BCN ceramic powder with two transition metal powders Ta and Nb for 10 hours on a mixer in an argon atmosphere according to the mol ratio of BCN to Ta to Nb of 1:0.2:0.2 to form second premixed powder, wherein the masses of BCN, Ta and Nb are respectively 6.84g, 6.72g and 3.45g, the diameter of a silicon nitride grinding ball used for ball milling is 8mm, and the ball-to-material ratio is 10: 1;
and step S4, sieving the second premixed powder, and ball-milling the sieved second premixed powder for 24 hours on a high-energy ball mill at the rotating speed of 350rpm to obtain the multi-element BCN series high-entropy ceramic powder.
As shown in fig. 5 and 11(b), agglomeration of the nano-sized small particles is clearly observed from fig. 11(b), and a broadened diffraction peak is clearly observed from fig. 5, indicating that the particle size is clearly refined.
Example 2
As shown in fig. 6 and fig. 11(d), this example provides a method for preparing a multi-element BCN-based high-entropy ceramic powder, which is different from example 1 in that:
step S3, sieving the amorphous BCN ceramic powder with a 200 mesh sieve in a glove box, and uniformly mixing with four transition metal powders Ta, Nb, Hf and Zr in a molar ratio of BCN to Ta to Nb to Hf to Zr of 1:0.2: 0.2:0.2 in an argon atmosphere for 8h on a mixer to form a second premixed powder, wherein the mass of BCN, Ta, Nb, Hf and Zr is 4.30g, 4.23g, 2.17g, 4.17g and 2.13g respectively, and the silicon nitride milling ball used for ball milling has a diameter of 10mm, the ball-to-material ratio is 10:1, and the rest are the same as those in embodiment 1.
Example 3
As shown in fig. 7 and fig. 11(e), this example provides a method for preparing a multi-element BCN-based high-entropy ceramic powder, which is different from example 1 in that:
step S3, sieving the amorphous BCN ceramic powder with a 200-mesh sieve and five transition metal powders Ta, Nb, Hf, Zr and W in a glove box according to the molar ratio of BCN to Ta to Nb to Hf to Zr: the second premixed powder was formed by uniformly mixing, in an argon atmosphere, BCN, Ta, Nb, Hf, Zr, and W at a ratio of 1:0.2: 0.2:0.2, with a ball diameter of 10mm and a ball-to-material ratio of 10:1, for 3.43g, 3.37g, 1.73g, 3.33g, 1.70g, and 3.43g, respectively, in a blender in which W was 1:0.2: 0.2:0.2, and the balance was the same as in example 1.
Example 4
The embodiment provides a preparation method of multi-element BCN series high-entropy ceramic powder, which comprises the following steps:
step S1, weighing 6.5g of h-BN powder, 3.15g of graphite powder and 7.35g of simple substance silicon in a glove box, putting the materials into a mixing bottle, and uniformly mixing the materials on a mixer for 6 hours under a protective atmosphere to form third premixed powder;
step S2, sieving the third premixed powder, and ball-milling the sieved third premixed powder for 20 hours on a high-energy ball mill at the rotating speed of 400rpm to obtain amorphous SiBCN ceramic powder;
step S3, sieving the amorphous BCN ceramic powder with a 200-mesh sieve and transition metal powder Ta in a glove box, uniformly mixing the amorphous BCN ceramic powder and the transition metal powder Ta on a mixer for 15 hours in a protective atmosphere according to the mol ratio SiBCN to Ta, and forming fourth premixed powder, wherein the mass of SiBCN and the mass of Ta are respectively 12.51g and 4.49g, the diameter of a silicon nitride grinding ball used for ball milling is 9mm, and the ball-to-material ratio is 20: 1;
and step S4, sieving the fourth premixed powder, and ball-milling the powder for 24 hours on a high-energy ball mill at the rotating speed of 350rpm to obtain the multi-element BCN high-entropy ceramic powder.
As shown in fig. 8 and 11(c), agglomeration of the nano-sized small particles is clearly observed in fig. 11(c), and a broadened diffraction peak is clearly observed in fig. 8, indicating that the particle size is clearly refined.
Example 5
As shown in fig. 9 and fig. 11(a), this example provides a method for preparing a multi-element BCN-based high-entropy ceramic powder, which is different from example 4 in that:
step S3, the amorphous BCN ceramic powder was sieved through a 200 mesh sieve in a glove box and mixed with three transition metal powders Ta, Hf and Zr uniformly in a molar ratio SiBCN: Ta: Hf: Zr 1:1:1 under a protective atmosphere for 18h in a mixer to form a fourth premixed powder, the mass of SiBCN, Ta, Hf and Zr was 2.14g, 5.97g, 5.88g and 3.01g, respectively, wherein the silicon nitride milling ball used for the ball milling had a diameter of 9mm and a ball-to-material ratio of 20:1, and the rest was the same as in example 4.
Example 6
As shown in fig. 10 and fig. 11(f), this embodiment further provides a method for preparing a multi-element BCN-based high-entropy ceramic powder, including the following steps:
s1, weighing 0.74g of h-BN powder, 1.08g of graphite powder, 1.68g of simple substance silicon, 5.42g of Ta5, 5.35g of ZrC and 2.73g of Hf2 in a glove box, filling the materials into a mixing bottle, and uniformly mixing the materials on a mixer for 10 hours in an argon atmosphere to form fifth premixed powder;
and step S2, sieving the fifth premixed powder with a 200-mesh sieve, and ball-milling for 40 hours on a high-energy ball mill at the rotating speed of 600rpm to obtain the multi-element BCN series high-entropy ceramic powder.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A preparation method of multi-element BCN series high-entropy ceramic powder is characterized by comprising the following steps: uniformly mixing the nonmetal ceramic powder, and performing high-energy ball milling to obtain amorphous ceramic powder; uniformly mixing the amorphous ceramic powder with transition metal, and performing high-energy ball milling to obtain the multi-BCN high-entropy ceramic powder, wherein the method comprises the following steps:
step S1, uniformly mixing the h-BN powder and the graphite powder for 5-20h on a mixer in a protective atmosphere according to the molar ratio of 0.5-2:1 to form first premixed powder;
step S2, screening the first premixed powder, and ball-milling the powder for 5-12h on a high-energy ball mill at the rotating speed of 300-600rpm to obtain amorphous BCN ceramic powder;
step S3, uniformly mixing the amorphous BCN ceramic powder and at least two transition metal powders on a mixer for 10-20h under the protective atmosphere with the mol ratio of alpha-BCN: M1: M2: Mi =1:0.2-2:0.2-2:0.2-2 to form second premixed powder, wherein M1, M2 and Mi refer to different transition metal elements respectively, and i is more than or equal to 2;
and step S4, screening the second premixed powder, and ball-milling the second premixed powder for 1-40h on a high-energy ball mill at the rotating speed of 300-600rpm to obtain the multi-element BCN series high-entropy ceramic powder.
2. A preparation method of multi-element BCN series high-entropy ceramic powder is characterized in that non-metal ceramic powder is uniformly mixed and then subjected to high-energy ball milling to obtain amorphous ceramic powder; uniformly mixing the amorphous ceramic powder with transition metal, and performing high-energy ball milling to obtain the multi-BCN high-entropy ceramic powder, wherein the method comprises the following steps:
step S1, uniformly mixing the h-BN powder, the graphite powder and the simple substance silicon for 5-10h on a mixer in a molar ratio of 0.5-3:0.5-3:1 under a protective atmosphere to form third premixed powder;
step S2, sieving the third premixed powder, and ball-milling the sieved third premixed powder for 20-40h on a high-energy ball mill at the rotating speed of 300-600rpm to obtain amorphous SiBCN ceramic powder;
step S3, uniformly mixing the amorphous SiBCN ceramic powder and at least one transition metal powder on a mixer for 10-20h under the protective atmosphere of alpha-Si BCN, M1, M2, Mi =1:0.2-2:0.2-2:0.2-2 according to the molar ratio to form fourth premixed powder, wherein M1, M2 and Mi respectively refer to different transition metal elements, and i is more than or equal to 2;
and step S4, screening the fourth premixed powder, and ball-milling the sieved fourth premixed powder for 1-40h on a high-energy ball mill at the rotating speed of 300-600rpm to obtain the multi-element BCN series high-entropy ceramic powder.
3. A preparation method of multi-element BCN series high-entropy ceramic powder is characterized by comprising the following steps: the method comprises the following steps of uniformly mixing nonmetal ceramic powder and transition metal, and then carrying out high-energy ball milling at normal temperature to obtain multi-element BCN series high-entropy ceramic powder, and comprises the following steps:
step S1, uniformly mixing the h-BN powder, the graphite powder, the simple substance silicon and three transition metals according to the molar ratio of h-BN to graphite to Si to M1 to M2 to M3=1: 0.5-3:0.5-3:0.2-2:0.2-2 to 2 in a protective atmosphere on a mixer for 5-10h to form fifth premixed powder;
and step S2, screening the fifth premixed powder, and ball-milling the powder for 20-40h on a high-energy ball mill at the rotating speed of 300-600rpm to obtain the multi-element BCN series high-entropy ceramic powder.
4. A method of producing a multi-element BCN-based high entropy ceramic powder of any one of claims 1 to 3, wherein the transition metal includes at least one fourth, fifth, or sixth transition metal.
5. The method for preparing the multi-element BCN-series high-entropy ceramic powder according to claim 4, wherein the transition metal comprises one or more of tantalum powder, niobium powder, tungsten powder, hafnium powder, zirconium powder and molybdenum powder.
6. The preparation method of the multi-element BCN series high-entropy ceramic powder according to any one of claims 1 to 3, wherein in the high-energy ball milling process, a grinding ball is a silicon nitride grinding ball, the diameter range of the grinding ball is 8-15mm, and the ball-to-material ratio is 10-20: 1.
7. The method for preparing a multi-element BCN-series high-entropy ceramic powder according to any one of claims 1 to 3, wherein the protective atmosphere is argon.
8. The multi-BCN-series high-entropy ceramic powder prepared by the preparation method of the multi-BCN-series high-entropy ceramic powder according to any one of claims 1 to 3, wherein the multi-BCN-series high-entropy ceramic powder is multi-face-centered cubic single-phase solid solution high-entropy ceramic powder.
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