CN111139390A - Chromium-doped modified Mo2NiB2Base cermet and method for preparing same - Google Patents
Chromium-doped modified Mo2NiB2Base cermet and method for preparing same Download PDFInfo
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- CN111139390A CN111139390A CN202010001835.4A CN202010001835A CN111139390A CN 111139390 A CN111139390 A CN 111139390A CN 202010001835 A CN202010001835 A CN 202010001835A CN 111139390 A CN111139390 A CN 111139390A
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- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/14—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on borides
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- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
- C22C1/053—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor with in situ formation of hard compounds
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/005—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides comprising a particular metallic binder
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Abstract
The invention discloses chromium-doped modified Mo2NiB2The preparation method of the base metal ceramic comprises the steps of proportioning molybdenum powder, nickel powder, boron powder and chromium powder according to a certain proportion, then carrying out ball milling, drying mixed slurry after ball milling, sieving and granulating; loading the sieved mixed material into a mold for compression molding, sintering in vacuum and cooling in a furnace to obtain the Cr-doped modified Mo2NiB2A base cermet. The invention has the advantages of rich raw material resources, simple preparation process and lower production cost, and the obtained Cr-doped modified Mo2NiB2The base cermet has high hardness and strength, and excellent wear resistance and corrosion resistance.
Description
Technical Field
The invention belongs to the technical field of metal ceramics, and particularly relates to chromium-doped modified Mo2NiB2A base cermet and a preparation method thereof.
Background
Mo2NiB2Base cermet with Mo2NiB2Is a hard phase, uses Ni as a binding phase and has the excellent performance of metal and ceramic. Meanwhile, the method does not contain strategy resources such as W, Co and the like, and has wide development and application prospects due to rich B resource content in China. Wherein Cr is doped with modified Mo2NiB2The doping of Cr in the base cermet can improve the non-uniformity of the structure, so that the material has high strength and high hardness, is an ideal material for preparing tools, dies and wear-resistant parts, and is widely used as a cutting tool.
Mo prepared from MoB powder, Ni powder and Mo powder by Toyo Kohan company of Japan2NiB2The MoB powder is expensive, so that the preparation cost is greatly increased, and the structure of the base metal ceramic is not perfect.
Disclosure of Invention
The invention aims to solve the technical problem of providing a chromium-doped modified Mo2NiB2The addition of Cr can improve the nonuniformity of the structure. Cr-doped modified Mo prepared by the invention2NiB2The base cermet has simple components, no rare strategic resources such as W, Co, high hardness, high strength, good wear resistance and low preparation cost.
The invention adopts the following technical scheme:
chromium-doped modified Mo2NiB2The preparation method of the base cermet comprises the following steps:
s1, uniformly mixing Mo, Ni, B and Cr powder with the purity of not less than 99%, wherein the atomic ratio of Mo to B is 1.1, the content of B is not less than 5%, and the balance is Ni;
s2, putting the uniformly mixed raw materials into a ball milling tank, adding silicon nitride grinding balls, carrying out wet milling by taking absolute ethyl alcohol as a ball milling medium, vacuumizing, filling argon, repeating the process for two times, and then opening the ball mill for ball milling treatment;
s3, firstly vacuumizing the ball-milled slurry, and starting heating and drying;
s4, after the step S3 is completed, sieving the raw material powder and then granulating;
s5, filling the powder into a metal mold, and performing compression molding and pressure maintaining to obtain a molded blank;
s6, sintering the formed blank at high temperature and preserving heat to obtain Mo2NiB2A base cermet.
Specifically, in step S1, the raw material powders are in the following weight percentage: mo: 50% -65%, Ni: 25% -45%, B: 5% -7%, Cr: 4 to 13 percent.
Specifically, in step S2, Φ of the silicon nitride grinding ball is 4-7 mm, and the ball-to-material ratio is controlled to be (2-6): 1, the addition amount of the absolute ethyl alcohol is 30-40 percent of the mass of the raw material powder.
Specifically, in step S2, the ball milling rotation speed is 150 to 300r/min, and the ball milling processing time is 8 to 18 hours.
Specifically, in step S3, after vacuum pumping, the air pressure is reduced to less than 0.1MPa, and then drying is performed at 40-60 ℃.
Specifically, in step S4, the raw material powder is sieved by a 150-300 mesh sieve.
Specifically, in step S5, the pressure for compression molding is 100 to 300MPa, and the pressure-holding time is 60 to 180 seconds.
Specifically, in step S6, the high-temperature sintering specifically includes: controlling the vacuum degree to be 10-3And Pa, raising the temperature from room temperature to 1200-1400 ℃, wherein the temperature raising rate below 1000 ℃ is 8 ℃/min, the temperature raising rate above 1000 ℃ is 5 ℃/min, and the heat preservation time is 0.5-1.5 h.
The other technical scheme of the invention is that the chromium-doped modified Mo2NiB2A base cermet.
Specifically, chromium-doped modified Mo2NiB2The density of the base cermet is 96.0-99.2%, the hardness is 86.1-87.9 HRA, and the bending strength is 1421-1756 MPa.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention provides chromium-doped modified Mo2NiB2A cermet comprises a hard phase and a binder phase,the raw materials are prepared by mixing, wet grinding, drying, sieving, granulating, compression molding and vacuum sintering, the preparation process is simple, the strategic scarce resources such as W, Co are not contained, and Mo is used2NiB2The Ni bonding phase is used as a hard phase, so that the cost is low; the wettability of the hard phase and the binding phase is good, the formed metal ceramic has high density and excellent main mechanical index, and is suitable for industrial popularization.
Furthermore, the weight percentage of the Mo, Ni, B and Cr powders can better play the synergistic effect of the hard phase and the binder phase.
Furthermore, a certain amount of alcohol is added in the ball milling process and the ball milling process is carried out under the protection of argon gas, so that the oxidation of the powder is prevented.
Furthermore, the ball milling speed is 150-300 r/min, the ball milling treatment time is 8-18 h, and the refinement of the powder can be ensured.
Further, in the step S3, after the slurry is vacuumized, the air pressure is reduced to less than 0.1MPa, and then drying is performed at 40-60 ℃ to evaporate alcohol in the slurry.
Further, in step S4, the raw material powder is granulated by a 200 mesh sieve to increase the flowability of the powder in a subsequent mold.
Further, in step S5, the pressure for compression molding is 100 to 300MPa, the pressure holding time is 60 to 180S, and the compression molding can be performed while ensuring a certain compactness.
Further, in step S6, the high-temperature sintering specifically includes: controlling the vacuum degree to be 10-3And Pa, raising the temperature from room temperature to 1200-1350 ℃, wherein the temperature raising rate below 1000 ℃ is 8 ℃/min, the temperature raising rate above 1000 ℃ is 5 ℃/min, the heat preservation time is 0.5-1.5 h, hard phase particles are generated, and a bonding liquid phase appears, so that the sample is more densified.
Further, chromium-doped modified Mo2NiB2The hardness of the base metal ceramic is improved by 2.5-4.3 HRA, and the bending strength is improved by 160MPa to the maximum.
In conclusion, the method has the advantages of rich raw material resources, simple preparation process and lower production cost, and the obtained Cr-doped modified Mo2NiB2The base cermet has high hardness and strength, and excellent wear resistance and corrosion resistance.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 shows Cr-doped modified Mo prepared in example 1 of the present invention2NiB2SEM photograph of the microstructure of the base cermet.
Detailed Description
The invention relates to chromium-doped modified Mo2NiB2The preparation method of the base cermet comprises the following steps:
s1, mixing
The weight percentages of the raw material powders are as follows: mo: 51.0% -63.5%, Ni: 21.5% -40.0%, B: 5.0-7.0%, Cr: 4.0 to 10.0 percent of the total weight of the alloy, and evenly mixing four raw material powders of Mo, Ni, B and Cr, wherein the atomic ratio of Mo to B is controlled to be 1.1, the content of B is not less than 5.0 percent, and the balance is Ni.
S2 ball milling
Putting the uniformly mixed raw materials into a ball milling tank, adding silicon nitride grinding balls (phi is 4-7 mm), and controlling the ball-material ratio to be (2-6): adding anhydrous ethanol with the mass of 30-40% of that of the raw material powder as a ball milling medium, vacuumizing, filling argon, repeating the process twice, opening the ball mill, and adjusting the ball milling speed to 150-300 r/min for 8-18 h;
s3, drying
Placing the slurry subjected to ball milling in a rotary evaporator, vacuumizing, reducing the air pressure to be less than 0.1MPa, and starting heating and drying, wherein the drying temperature is 40-60 ℃;
s4, sieving and granulating
After drying, granulating the raw material powder by a sieve of 150-300 meshes to increase the flowability of the powder in a subsequent die;
s5, press forming
Putting the powder into a metal mold, and performing compression molding under the pressure of 100-300 MPa for 60-180 s;
s6, sintering
Sintering the formed blank at a high temperature of 1200-1350 ℃, wherein the vacuum degree during high-temperature sintering is 10- 3Pa, raising the temperature from room temperature to 1200-1350 ℃, wherein the temperature raising rate below 1000 ℃ is 8 ℃/min, the temperature raising rate above 1000 ℃ is 5 ℃/min, and the heat preservation time is 0.5-1.5 h to obtain Mo2NiB2Base cermet, chromium-doped modified Mo2NiB2The density of the base cermet is 96.0-99.2%, the hardness is 86.1-87.9 HRA, and the bending strength is 1421-1756 MPa.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Cr-doped modified Mo2NiB2The preparation method of the base metal ceramic comprises the steps of mixing, wet grinding, drying, sieving granulation, compression molding and vacuum sintering, and comprises the following specific steps:
(1) mixing material
The weight percentages of the raw material powders are as follows: mo: 58.6%, Ni: 25.9%, B: 6.0%, Cr: 9.5 percent, and evenly mixing the four raw material powders of Mo, Ni, B and Cr.
(2) Ball mill
Putting the uniformly mixed raw materials into a ball milling tank, and adding a silicon nitride grinding ball (phi is 4mm), wherein the ball-to-material ratio is controlled to be 4: adding absolute ethyl alcohol accounting for 40% of the mass of the raw material powder as a ball milling medium, vacuumizing, filling argon, repeating the process twice, opening the ball mill, adjusting the ball milling speed to 150r/min, and milling for 10 hours.
(3) Drying
Placing the slurry after ball milling in a rotary evaporator, firstly vacuumizing, reducing the air pressure to be less than 0.1MPa, and starting heating and drying, wherein the drying temperature is 50 ℃.
(4) Sieving and granulating
After the drying is finished, the raw material powder is granulated by passing through a 200-mesh sieve so as to increase the flowability of the powder in a subsequent die.
(5) Press forming
And (3) putting the powder into a metal mold, and performing compression molding under the pressure of 200MPa for 180 s.
(6) Sintering
Placing the formed blank body into a vacuum sintering furnace for high-temperature sintering, heating to 1000 ℃ from room temperature at the heating rate of 8 ℃/min, then heating to 1200 ℃ at the heating rate of 5 ℃/min, and keeping the vacuum degree at 10-3Pa, keeping the temperature for 1h, and then cooling with the furnace to obtain Mo2NiB2A base cermet.
Prepared Cr-doped modified Mo2NiB2The SEM photograph of the microstructure of the cermet is shown in FIG. 1, in which Mo is the light-colored portion2NiB2The hard phase and the light-colored part are Ni binder phases. The hard phase particles are much finer and have a tendency to spheroidize due to the doping of chromium.
Example 2
Cr-doped modified Mo2NiB2The preparation method of the base metal ceramic comprises the steps of mixing, wet grinding, drying, sieving granulation, compression molding and vacuum sintering, and comprises the following specific steps:
(1) mixing material
The weight percentages of the raw material powders are as follows: mo: 58.6%, Ni: 25.9%, B: 6.0%, Cr: 9.5 percent, and evenly mixing the four raw material powders of Mo, Ni, B and Cr.
(2) Ball mill
Putting the uniformly mixed raw materials into a ball milling tank, and adding a silicon nitride grinding ball (phi is 5mm), wherein the ball-to-material ratio is controlled to be 4: adding absolute ethyl alcohol accounting for 40% of the mass of the raw material powder as a ball milling medium, vacuumizing, filling argon, repeating the process twice, opening a ball mill, adjusting the ball milling speed to 150r/min, and performing ball milling for 10 hours.
(3) Drying
Placing the slurry after ball milling in a rotary evaporator, firstly vacuumizing, reducing the air pressure to be less than 0.1MPa, and starting heating and drying, wherein the drying temperature is 50 ℃.
(4) Sieving and granulating
After the drying is finished, the raw material powder is granulated by passing through a 200-mesh sieve so as to increase the flowability of the powder in a subsequent die.
(5) Press forming
And (3) putting the powder into a metal mold, and performing compression molding under the pressure of 200MPa for 180 s.
(6) Sintering
Placing the formed blank body into a vacuum sintering furnace for high-temperature sintering, heating to 1000 ℃ from room temperature at the heating rate of 8 ℃/min, then heating to 1300 ℃ at the sintering temperature at the heating rate of 5 ℃/min, and keeping the vacuum degree at 10-3Pa, keeping the temperature for 1h, and then cooling with the furnace to obtain Mo2NiB2A base cermet.
Example 3
Cr-doped modified Mo2NiB2The preparation method of the base metal ceramic comprises the steps of mixing, wet grinding, drying, sieving granulation, compression molding and vacuum sintering, and comprises the following specific steps:
(1) mixing material
The weight percentages of the raw material powders are as follows: mo: 58.6%, Ni: 25.9%, B: 6.0%, Cr: 9.5 percent, and evenly mixing the four raw material powders of Mo, Ni, B and Cr.
(2) Ball mill
Putting the uniformly mixed raw materials into a ball milling tank, and adding a silicon nitride grinding ball (phi is 6mm), wherein the ball-to-material ratio is controlled to be 3: adding absolute ethyl alcohol accounting for 30% of the mass of the raw material powder as a ball milling medium, vacuumizing, filling argon, repeating the process twice, opening the ball mill, and adjusting the ball milling speed to 200r/min for 12 hours.
(3) Drying
Putting the ball-milled slurry into a rotary evaporator, firstly vacuumizing, reducing the air pressure to be less than 0.1MPa, and starting heating and drying, wherein the drying temperature is 55 ℃.
(4) Sieving and granulating
After the drying is finished, the raw material powder is granulated by passing through a 200-mesh sieve so as to increase the flowability of the powder in a subsequent die.
(5) Press forming
And (3) putting the powder into a metal die, and performing compression molding under the pressure of 300MPa for 120 s.
(6) Sintering
Placing the formed blank into a vacuum sintering furnace for high-temperature sintering, heating to 1000 ℃ from room temperature at a heating rate of 8 ℃/min, then heating to 1350 ℃ at a heating rate of 5 ℃/min, wherein the vacuum degree is 10-3Pa, keeping the temperature for 1.5h, and then cooling the mixture along with the furnace to obtain Mo2NiB2A base cermet.
Example 4
Cr-doped modified Mo2NiB2The preparation method of the base metal ceramic comprises the steps of mixing, wet grinding, drying, sieving granulation, compression molding and vacuum sintering, and comprises the following specific steps:
(1) mixing material
The weight percentages of the raw material powders are as follows: mo: 51.0%, Ni: 40.0%, B: 5.0%, Cr: 4.0 percent of Mo, Ni, B and Cr are evenly mixed.
(2) Ball mill
Putting the uniformly mixed raw materials into a ball milling tank, and adding a silicon nitride grinding ball (phi is 7mm), wherein the ball-to-material ratio is controlled to be 4: adding absolute ethyl alcohol accounting for 40% of the mass of the raw material powder as a ball milling medium, vacuumizing, filling argon, repeating the process twice, opening the ball mill, and adjusting the ball milling speed to 250r/min for 10 hours.
(3) Drying
Placing the slurry after ball milling in a rotary evaporator, firstly vacuumizing, reducing the air pressure to be less than 0.1MPa, and starting heating and drying, wherein the drying temperature is 50 ℃.
(4) Sieving and granulating
After the drying is finished, the raw material powder is granulated by passing through a 200-mesh sieve so as to increase the flowability of the powder in a subsequent die.
(5) And (3) pressing and forming:
and (3) putting the powder into a metal mold, and performing compression molding under the pressure of 200MPa for 180 s.
(6) Sintering
Placing the formed blank body into a vacuum sintering furnace for high-temperature sintering, heating to 1000 ℃ from room temperature at the heating rate of 8 ℃/min, then heating to 1260 ℃ at the heating rate of 5 ℃/min, and keeping the vacuum degree at 10-3Pa, keeping the temperature for 1.5h, and then cooling the mixture along with the furnace to obtain Mo2NiB2A base cermet.
Example 5
Cr-doped modified Mo2NiB2The preparation method of the base metal ceramic comprises the steps of mixing, wet grinding, drying, sieving granulation, compression molding and vacuum sintering, and comprises the following specific steps:
(1) mixing material
The weight percentages of the raw material powders are as follows: mo: 53.7%, Ni: 32.3%, B: 5.5%, Cr: 8.5 percent, and evenly mixing the four raw material powders of Mo, Ni, B and Cr.
(2) Ball mill
Putting the uniformly mixed raw materials into a ball milling tank, and adding a silicon nitride grinding ball (phi is 5mm), wherein the ball-to-material ratio is controlled to be 4: adding absolute ethyl alcohol accounting for 40% of the mass of the raw material powder as a ball milling medium, vacuumizing, filling argon, repeating the process twice, opening the ball mill, and adjusting the ball milling speed to 300r/min for 10 hours.
(3) Drying
Placing the slurry after ball milling in a rotary evaporator, firstly vacuumizing, reducing the air pressure to be less than 0.1MPa, and starting heating and drying, wherein the drying temperature is 50 ℃.
(4) Sieving and granulating
After the drying is finished, the raw material powder is granulated by passing through a 150-mesh sieve so as to increase the flowability of the powder in a subsequent die.
(5) Press forming
And (3) putting the powder into a metal die, and performing compression molding under the pressure of 100MPa for 60 s.
(6) Sintering
Placing the formed blank body into a vacuum sintering furnace for high-temperature sintering, heating to 1000 ℃ from room temperature at the heating rate of 8 ℃/min, then heating to 1260 ℃ at the heating rate of 5 ℃/min, and keeping the vacuum degree at 10-3Pa, keeping the temperature for 0.5h, and then cooling the mixture along with the furnace to obtain Mo2NiB2A base cermet.
Example 6
Cr-doped modified Mo2NiB2The preparation method of the base metal ceramic comprises the steps of mixing, wet grinding, drying, sieving granulation, compression molding and vacuum sintering, and comprises the following specific steps:
(1) mixing material
The weight percentages of the raw material powders are as follows: mo: 63.5%, Ni: 21.5%, B: 7.0%, Cr: 8.0 percent, and evenly mixing the four raw material powders of Mo, Ni, B and Cr.
(2) Ball mill
Putting the uniformly mixed raw materials into a ball milling tank, and adding a silicon nitride grinding ball (phi is 6mm), wherein the ball-to-material ratio is controlled to be 4: adding absolute ethyl alcohol accounting for 40% of the mass of the raw material powder as a ball milling medium, vacuumizing, filling argon, repeating the process twice, opening the ball mill, and adjusting the ball milling speed to 300r/min for 10 hours.
(3) Drying
Placing the slurry after ball milling in a rotary evaporator, firstly vacuumizing, reducing the air pressure to be less than 0.1MPa, and starting heating and drying, wherein the drying temperature is 60 ℃.
(4) Sieving and granulating
After the drying is finished, the raw material powder is granulated by passing through a 300-mesh sieve so as to increase the flowability of the powder in a subsequent die.
(5) Press forming
And (3) putting the powder into a metal mold, and performing compression molding under the pressure of 200MPa for 180 s.
(6) Sintering
Placing the formed blank body into a vacuum sintering furnace for high-temperature sintering, heating to 1000 ℃ from room temperature at the heating rate of 8 ℃/min, then heating to 1260 ℃ at the heating rate of 5 ℃/min, and keeping the vacuum degree at 10-3Pa, keeping the temperature for 0.5h, and then cooling the mixture along with the furnace to obtain Mo2NiB2A base cermet.
Comparative example
Mo is carried out by adopting three raw material powders of Mo, Ni and B2NiB2The preparation method of the base cermet comprises the following specific steps of:
(1) mixing material
The weight percentages of the raw material powders are as follows: mo: 58.6%, Ni: 35.4%, B: 6.0 percent, and evenly mixing the three raw material powders of Mo, Ni and B.
(2) Ball mill
Putting the uniformly mixed raw materials into a ball milling tank, and adding a silicon nitride grinding ball (phi is 5mm), wherein the ball-material ratio is controlled to be 2: adding absolute ethyl alcohol accounting for 40% of the mass of the raw material powder as a ball milling medium, vacuumizing, filling argon, repeating the process twice, opening the ball mill, and adjusting the ball milling time to 10 hours.
(3) Drying
Placing the slurry after ball milling in a rotary evaporator, firstly vacuumizing, reducing the air pressure to be less than 0.1MPa, and starting heating and drying, wherein the drying temperature is 50 ℃.
(4) Sieving and granulating
After the drying is finished, the raw material powder is granulated by passing through a 200-mesh sieve so as to increase the flowability of the powder in a subsequent die.
(5) Press forming
And (3) putting the powder into a metal die, and performing compression molding under the pressure of 300MPa for 180 s.
(6) Sintering
Placing the formed blank into a vacuum sintering furnace for high-temperature sintering, heating to 1000 ℃ from room temperature at the heating rate of 8 ℃/min, and then at 5 DEG CHeating up to 1260 ℃ at a heating rate of/min and a vacuum degree of 10-3Pa, keeping the temperature for 1h, and then cooling with the furnace to obtain Mo2NiB2A base cermet.
Mo obtained in examples and comparative examples2NiB2The main properties of the base cermets are shown in the following table.
TABLE 1Mo2NiB2Main properties of base cermet
In conclusion, the pure Mo, Ni and B powder are used as raw materials, and the pure Cr powder is added for doping modification, so that the cost is relatively low, and the preparation process is simple; cr-doped modified Mo2NiB2The hardness and the strength of the base metal ceramic are both obviously improved, and the method is suitable for industrial popularization.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. Chromium-doped modified Mo2NiB2The preparation method of the base cermet is characterized by comprising the following steps:
s1, uniformly mixing Mo, Ni, B and Cr powder with the purity of not less than 99%, wherein the atomic ratio of Mo to B is 1.1, the content of B is not less than 5%, and the balance is Ni;
s2, putting the uniformly mixed raw materials into a ball milling tank, adding silicon nitride grinding balls, carrying out wet milling by taking absolute ethyl alcohol as a ball milling medium, vacuumizing, filling argon, repeating the process for two times, and then opening the ball mill for ball milling treatment;
s3, firstly vacuumizing the ball-milled slurry, and starting heating and drying;
s4, after the step S3 is completed, sieving the raw material powder and then granulating;
s5, filling the powder into a metal mold, and performing compression molding and pressure maintaining to obtain a molded blank;
s6, sintering the formed blank at high temperature and preserving heat to obtain Mo2NiB2A base cermet.
2. Chromium-doped modified Mo according to claim 12NiB2The preparation method of the base cermet is characterized in that in step S1, the base cermet comprises the following raw material powders in percentage by weight: mo: 51.0% -63.5%, Ni: 21.5% -40.0%, B: 5.0-7.0%, Cr: 4.0 to 10.0 percent.
3. Chromium-doped modified Mo according to claim 12NiB2The preparation method of the base cermet is characterized in that in the step S2, the phi of the silicon nitride grinding ball is 4-7 mm, and the ball-to-material ratio is controlled to be (2-6): 1, the addition amount of the absolute ethyl alcohol is 30-40 percent of the mass of the raw material powder.
4. Chromium-doped modified Mo according to claim 12NiB2The preparation method of the base metal ceramic is characterized in that in the step S2, the ball milling rotating speed is 150-300 r/min, and the ball milling processing time is 8-18 h.
5. Chromium-doped modified Mo according to claim 12NiB2The preparation method of the base metal ceramic is characterized in that in the step S3, after vacuumizing, the air pressure is reduced to be less than 0.1MPa, and then drying treatment is carried out at 40-60 ℃.
6. Chromium-doped modified Mo according to claim 12NiB2The preparation method of the base cermet is characterized in that in the step S4, raw material powder is sieved by a 150-300-mesh sieve.
7. Chromium-doped modified Mo according to claim 12NiB2The preparation method of the base metal ceramic is characterized in that in the step S5, the pressure of compression molding is 100-300 MPa, and the pressure maintaining time is 60-180S.
8. Chromium-doped modified Mo according to claim 12NiB2The preparation method of the base cermet is characterized in that in the step S6, the high-temperature sintering specifically comprises the following steps: controlling the vacuum degree to be 10-3And Pa, raising the temperature from room temperature to 1200-1400 ℃, wherein the temperature raising rate below 1000 ℃ is 8 ℃/min, the temperature raising rate above 1000 ℃ is 5 ℃/min, and the heat preservation time is 0.5-1.5 h.
9. Chromium-doped modified Mo prepared by the method of claim 12NiB2A base cermet.
10. Chromium-doped modified Mo according to claim 92NiB2The base cermet is characterized in that the chromium is doped with modified Mo2NiB2The density of the base cermet is 96.0-99.2%, the hardness is 86.1-87.9 HRA, and the bending strength is 1421-1756 MPa.
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| CN115976358A (en) * | 2022-11-25 | 2023-04-18 | 西安近代化学研究所 | High-hardness Mo 2 NiB 2 Preparation method of-TiC-based composite material |
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| CN115976358A (en) * | 2022-11-25 | 2023-04-18 | 西安近代化学研究所 | High-hardness Mo 2 NiB 2 Preparation method of-TiC-based composite material |
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| CN116621586A (en) * | 2023-05-29 | 2023-08-22 | 西安热工研究院有限公司 | WNiB ceramic and preparation method thereof |
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