CN114262833A - High-entropy carbide-reinforced TiCN-based metal ceramic with high hardness and high toughness and preparation method and application thereof - Google Patents

High-entropy carbide-reinforced TiCN-based metal ceramic with high hardness and high toughness and preparation method and application thereof Download PDF

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CN114262833A
CN114262833A CN202111672363.6A CN202111672363A CN114262833A CN 114262833 A CN114262833 A CN 114262833A CN 202111672363 A CN202111672363 A CN 202111672363A CN 114262833 A CN114262833 A CN 114262833A
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entropy carbide
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CN114262833B (en
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郭伟明
劳振勇
谭大旺
林华泰
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Guangdong University of Technology
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Abstract

The invention belongs to the field of metal ceramic cutting processing, and discloses a high-entropy carbide-reinforced TiCN-based metal ceramic with high hardness and high toughness, and a preparation method and application thereof. The cermet isMixing TiC0.7N0.3、WC、Ni、Co、Mo2C. VC, AlN and (Ta)0.2W0.2V0.2Mo0.2Nb0.2) Ball-milling the C high-entropy carbide powder together to obtain mixed powder, drying, performing dry pressing and cold isostatic pressing, fully wrapping the green body with carbon powder, sintering at 1450-1600 ℃, and preserving heat to obtain the carbon powder; said (Ta)0.2W0.2V0.2Mo0.2Nb0.2) Passing C high-entropy carbide powder through Ta2O5、V2O5、WO3、Nb2O5、MoO3And C, mixing and ball-milling the six kinds of powder, drying and then preparing the powder by a carbothermic reduction method at 1600-1700 ℃.

Description

High-entropy carbide-reinforced TiCN-based metal ceramic with high hardness and high toughness and preparation method and application thereof
Technical Field
The invention belongs to the field of metal ceramic cutting processing, and particularly relates to high-entropy carbide-reinforced TiCN-based metal ceramic with high hardness and high toughness as well as a preparation method and application thereof.
Background
The Ti (C, N) -based cermet is a ceramic-based composite material consisting of a ceramic phase (TiCN/TiC + TiC), one or more transition metal binding phases (Ni/Co/Fe and the like) and one or more transition metal carbides (WC/Mo2C/VC/TaC/NbC and the like) as additive phases. Compared with the traditional hard alloy, the TiCN-based cermet has more excellent red hardness, wear resistance, chemical stability, small friction coefficient and other performances, and can save a large amount of strategic resources of tungsten and cobalt. However, with the same amount of cobalt-nickel binder, the toughness and impact resistance of TiCN-based cermet are difficult to reach the conventional cemented carbide level. The further popularization and application of the TiCN-based metal ceramic material are limited due to the insufficient obdurability.
In order to improve the problem of insufficient toughness, research is mainly focused on adding more single carbide components to improve the performance of the single carbide components, such as WC, Mo2C, VC, TaC, NbC, Cr2C3 and the like, and although the toughness and the impact resistance of the single carbide components are improved to a certain extent, the double requirements of high toughness and high hardness cannot be met, and the toughness of the single carbide components is still 15% -20% lower than that of hard alloy. The multi-component high-entropy carbide ceramic breaks through the development mode of the traditional ceramic, is a novel carbide ceramic which is composed of at least 5 elements and carbon and has excellent performances such as high-temperature hardness, high wear resistance, oxidation resistance and the like.
Under the condition that the traditional carbide adding mode has no means of achieving high-level simultaneous improvement of the toughness and the hardness of the TiCN-based cermet, the method is added into the TiCN-based cermet in the form of high-entropy carbide. With Ta2O5、V2O5、WO3、Nb2O5、MoO3Mixing and ball-milling six kinds of C powder in proportion, and preparing (Ta) by carbothermal reduction method0.2W0.2V0.2Mo0.2Nb0.2) C high-entropy carbide is crushed, ground and sieved to prepare high-entropy carbide powder, and the toughness of the TiCN-based metal ceramic is improved by utilizing the characteristic that the high-entropy carbide is a multi-component single-phase solid solution and the excellent properties of high-temperature hardness, high wear resistance, oxidation resistance and the like.
Disclosure of Invention
In order to overcome the defects that TiCN-based cermet in the prior art is low in obdurability, cannot synchronously improve high obdurability and high hardness and is unstable in performance, the invention aims to provide high-entropy carbide-reinforced TiCN-based cermet with high hardness and high toughness.
Another object of the present invention is to provide a method for preparing the above-mentioned high-entropy carbide-reinforced TiCN-based cermet having high hardness and high toughness.
It is a further object of the present invention to provide a use of the above high entropy carbide reinforced TiCN based cermet having high hardness and high toughness.
The purpose of the invention is realized by the following technical scheme:
a high entropy carbide reinforced TiCN based cermet having high hardness and high toughness, wherein said cermet is prepared by mixing TiC0.7N0.3、WC、Ni、Co、Mo2C. VC, AlN and (Ta)0.2W0.2V0.2Mo0.2Nb0.2) Ball-milling the C high-entropy carbide powder together to obtain mixed powder, drying, performing dry pressing and cold isostatic pressing, fully wrapping the green body with carbon powder, sintering at 1450-1600 ℃, and preserving heat to obtain the carbon powder; the TiC0.7N0.3、WC、Ni、Co、Mo2C. VC, AlN and (Ta)0.2W0.2V0.2Mo0.2Nb0.2) The mass ratio of C is (45-60) to (8-16): 6.5:6.5:6.5:5 (1-2) to (3-13); said (Ta)0.2W0.2V0.2Mo0.2Nb0.2) C high entropy carbidePowder passing through Ta2O5、V2O5、WO3、Nb2O5、MoO3And C, mixing and ball-milling the six kinds of powder, drying and then preparing the powder by a carbothermic reduction method at 1600-1700 ℃.
Preferably, said TiC0.7N0.3、WC、Ni、Co、Mo2C. The grain diameter of VC and AlN powder is 1-3 microns; said Ta2O5、V2O5、WO3、Nb2O5、MoO3The particle size of the powder of C is 0.5-3 microns; said (Ta)0.2W0.2V0.2Mo0.2Nb0.2) The grain diameter of the C high-entropy carbide powder is 0.5-5 microns.
Said (Ta)0.2W0.2V0.2Mo0.2Nb0.2) The C high-entropy carbide is prepared according to the following operation steps:
s1, mixing Ta2O5、V2O5、WO3、Nb2O5、MoO3Mixing the six powder C according to the molar ratio of 0.5:0.5:1:0.5:1:18 to obtain mixed powder; adding WC-Co hard alloy balls (YG8) and absolute ethyl alcohol into the mixed powder, and carrying out roller ball milling for 24-48 h; the mass ratio of the WC-Co hard alloy balls to the absolute ethyl alcohol to the mixed powder (namely the mass ratio of the ball wine material) is 6:3: 1;
s2, performing rotary evaporation treatment on the ball-milled slurry, and then drying the ball-milled slurry in a drying oven at the temperature of 60-100 ℃ to obtain dry powder;
s3, screening the dried powder through a 100-sand 200-mesh sieve, and performing dry pressing at 8-20MPa to obtain a blank;
s4, placing the blank into a vacuum furnace, and carrying out heat preservation at the temperature of 1600-1700 ℃ for 1-2h to prepare (Ta)0.2W0.2V0.2Mo0.2Nb0.2) C high entropy carbide block;
s5, mixing (Ta)0.2W0.2V0.2Mo0.2Nb0.2) Crushing and grinding the C high-entropy carbide block, and sieving with a 100-200-mesh sieve to obtain (Ta)0.2W0.2V0.2Mo0.2Nb0.2) C high entropy carbide powder.
Preferably, the diameters of the WC-Co hard alloy balls in the step S1 are 5mm and 10mm, and the mass ratio of the two balls is 1: 2;
preferably, the drying time in step S2 is 12-24 h;
preferably, the dwell time of the dry pressure in step S3 is 20-60S.
The preparation method of the high-entropy carbide reinforced TiCN-based metal ceramic with high hardness and high toughness is characterized by comprising the following operation steps of:
S1.TiC0.7N0.3WC, Ni, Co, Mo2C, VC, AlN and (Ta)0.2W0.2V0.2Mo0.2Nb0.2) C, preparing the high-entropy carbide powder to obtain mixed powder; adding WC-Co hard alloy balls (YG8) and absolute ethyl alcohol into the mixed powder, and carrying out roller ball milling for 24-48 h; the mass ratio of the WC-Co hard alloy balls to the absolute ethyl alcohol to the mixed powder (namely the mass ratio of the ball wine material) is 5:2: 1;
s2, performing rotary evaporation treatment on the ball-milled slurry, and then drying the ball-milled slurry in a drying oven at the temperature of 60-100 ℃ to obtain dry powder;
s3, after the dried powder passes through a sieve with the temperature of 100-;
s4, placing the blank into a vacuum furnace, and sintering at 1450-1600 ℃ to obtain the high-entropy carbide reinforced TiCN-based metal ceramic with high hardness and high toughness.
Preferably, the diameters of the WC-Co hard alloy balls in the step S1 are 5mm and 10mm, and the mass ratio of the two balls is 1: 2;
preferably, the drying time in step S2 is 12-24 h.
Preferably, the dwell time of the dry pressure in the step S3 is 20S-60S, and the dwell time of the cold isostatic pressing is 5-15 min; and 5-15MPa and 20-60s pressure maintaining and pressing molding are adopted in the process of fully wrapping the blank by the carbon powder.
Preferably, the sintering time in step S4 is 1-4.5 h.
The high-entropy carbide reinforced TiCN-based metal ceramic with high hardness and high toughness is applied to the field of cutter cutting.
The invention uses Ta2O5、V2O5、WO3、Nb2O5、MoO3Mixing and ball-milling six kinds of C powder in proportion, and preparing (Ta) by carbothermal reduction method0.2W0.2V0.2Mo0.2Nb0.2) C high-entropy carbide, crushing, grinding and sieving to prepare high-entropy carbide powder, and preparing the high-entropy carbide powder from Ta0.2W0.2V0.2Mo0.2Nb0.2) C high-entropy carbide replaces part of single-component carbide. (Ta) compared to conventional additions to TiCN-based cermets in the form of single-component carbides0.2W0.2V0.2Mo0.2Nb0.2) The addition of the C high-entropy carbide to the TiCN-based cermet instead of partial single-component carbide has the following advantages:
(1) greatly improving the sintering stability of the metal ceramic. Compared with a single component adding form, the high-entropy carbide is more uniformly distributed, so that the composition segregation is fundamentally avoided, the matrix structure is more uniform, and the performance tends to be consistent;
(2) is convenient for controlling the product quality. The high-entropy carbide is fixed in element components, so that various problems in the batching and mixing processes are fundamentally avoided, and conditions are provided for the stability of product quality. By adopting a carbon powder full-wrapping process, the heat-permeable material can be well balanced, the influence of heat radiation in the sintering process on a local area of a sample is avoided, the high-temperature damage and the component local precipitation of the metal ceramic caused by high temperature are avoided, the sintering thermal stress is avoided, and the uniformity of the performance of the sample is improved;
(3) the service performance of the metal ceramic is improved. Partial carbide is fully dissolved in advance, so that the sintering dissolution-precipitation effect of the matrix is controlled, the matrix has high hardness and high toughness, the compression resistance and the impact resistance of the product can be effectively improved, and the service life of the cutter is prolonged. The invention adopts the traditional cobalt-nickel binder in the ingredients, adopts the double pressing process of mould pressing and cold isostatic pressing, adopts the vacuum sintering process of carbon powder full wrapping, and explores the preparation method for preparing the high-performance high-entropy carbide reinforced TiCN-based metal ceramic according to the existing production process of metal ceramic and hard alloy.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention adopts (Ta)0.2W0.2V0.2Mo0.2Nb0.2) Compared with a single component adding form, the C high-entropy carbide is more uniform in element distribution, so that component segregation is avoided fundamentally, the matrix structure is more uniform, and the performance tends to be consistent.
(2) Invention (Ta)0.2W0.2V0.2Mo0.2Nb0.2) The C high-entropy carbide is fixed in element components, so that various problems in the batching and mixing process are fundamentally avoided, and conditions are provided for the stability of product quality.
(3) Sufficient preliminary solid solution of the partial carbide of the present invention ((Ta)0.2W0.2V0.2Mo0.2Nb0.2) C high-entropy carbide) to control the sintering dissolution-precipitation effect of the matrix, so that the matrix has high hardness and high toughness, the compression resistance and impact resistance of the product can be effectively improved, and the service life of the cutter is prolonged.
(4) The method adopts a carbon powder full-wrapping process, can well balance heat-penetrating materials, avoids the influence of heat radiation in the sintering process on a local area of a sample, avoids high-temperature damage and component local precipitation of metal ceramics caused by high temperature, avoids the generation of sintering thermal stress, and improves the performance of the sample and the uniformity of the performance.
Drawings
FIG. 1 is (Ta)0.2W0.2V0.2Mo0.2Nb0.2) XRD analysis pattern of C high entropy carbide powder.
FIG. 2 is a schematic view of carbon powder wrapped metal ceramic green body.
FIG. 3 shows the addition of 10 wt% (Ta)0.2W0.2V0.2Mo0.2Nb0.2) And C, the cermet has 30kg load indentation appearance.
FIG. 4 shows the addition of 10 wt% (Ta)0.2W0.2V0.2Mo0.2Nb0.2) And C, 30kg load indentation crack propagation morphology of the cermet.
FIG. 5 is an indentation pattern of a comparative cermet under a load of 30 kg.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
1. Mixing Ta2O5、V2O5、WO3、Nb2O5、MoO3Mixing the powder C according to the molar ratio of 0.5:0.5:1:0.5:1:18 to obtain mixed powder; adding WC-Co hard alloy balls (YG8) with the diameters of 5mm and 10mm and absolute ethyl alcohol into the mixed powder according to the ball wine material mass ratio of 6:3:1, and carrying out roller ball milling on the mixed powder for 24 hours;
2. carrying out rotary evaporation treatment on the ball-milled slurry, and then drying the ball-milled slurry in a drying oven at 60 ℃ for 12 hours to obtain dry powder;
3. sieving the dried powder with a 200-mesh sieve, and pressing into a green body under the pressure of 15MPa for 20 s;
4. putting the blank into a vacuum furnace, and preserving heat for 1h at the temperature of 1650 ℃ to carry out carbothermic reduction to prepare (Ta)0.2W0.2V0.2Mo0.2Nb0.2) C high entropy carbide block;
5. to be prepared completely (Ta)0.2W0.2V0.2Mo0.2Nb0.2) Crushing and grinding C high-entropy carbide block, and sieving with 200 mesh sieve to obtain (Ta)0.2W0.2V0.2Mo0.2Nb0.2) C high entropy carbide powder, prepared (Ta)0.2W0.2V0.2Mo0.2Nb0.2) The XRD pattern of the C high-entropy carbide is shown in figure 1.
Example 2
1. According to 45 wt% TiC0.7N0.3、16wt%WC、6.5 wt% Ni, 6.5 wt% Co, 6.5 wt% Mo2C, 5 wt% VC, 1.5 wt% AlN, and 13 wt% (Ta)0.2W0.2V0.2Mo0.2Nb0.2) C, preparing powder of the high-entropy carbide (prepared in example 1) to obtain mixed powder; adding WC-Co hard alloy balls (YG8) with the diameters of 5mm and 10mm and absolute ethyl alcohol into the mixed powder according to the ball wine material mass ratio of 5:2:1, and carrying out roller ball milling on the mixed powder for 24 hours;
2. carrying out rotary evaporation treatment on the ball-milled slurry, and then drying the ball-milled slurry in a drying oven at 60 ℃ for 12 hours to obtain dry powder;
3. sieving the dried powder with 100 mesh sieve, maintaining pressure for 20s at 60MPa and maintaining pressure for 5min at 250MPa, pressing into blank, wrapping with carbon powder, maintaining pressure for 20s at 10MPa, and making into blank, wherein the wrapping schematic diagram is shown in FIG. 2;
4. and (3) putting the blank into a vacuum furnace, sintering at 1600 ℃, and preserving heat for 1.5h (the specific heating and preserving time is 0-800 ℃ for 1.5h, 800-.
And (3) performance testing: the indentation toughness of the obtained cermet is 14.88 +/-0.23 MPa-m1/2The indentation hardness is 18.76 +/-0.55 GPa, and the density is 6.89g/cm3
Example 3
1. According to 49 wt% TiC0.7N0.315 wt% WC, 6.5 wt% Ni, 6.5 wt% Co, 6.5 wt% Mo2C, 5 wt% VC, 1.5 wt% AlN, and 10 wt% (Ta)0.2W0.2V0.2Mo0.2Nb0.2) C, preparing powder of the high-entropy carbide (prepared in example 1) to obtain mixed powder; adding WC-Co hard alloy balls (YG8) with the diameters of 5mm and 10mm and absolute ethyl alcohol into the mixed powder according to the ball wine material mass ratio of 5:2:1, and carrying out roller ball milling on the mixed powder for 24 hours;
2. carrying out rotary evaporation treatment on the ball-milled slurry, and then drying the ball-milled slurry in a drying oven at 60 ℃ for 12 hours to obtain dry powder;
3. sieving the dried powder with a 100-mesh sieve, pressing into a green body by keeping the pressure for 20s at 60MPa and keeping the pressure for 5min at 250MPa through cold isostatic pressing, fully wrapping with carbon powder, and pressing into a green body by keeping the pressure for 20s at 10 MPa;
4. and (3) putting the blank into a vacuum furnace, sintering at the temperature of 1550 ℃, and carrying out heat preservation for 1h (the specific heating and heat preservation time is 0-800 ℃, heating for 2.5h, 800-1550 heating for 5.5h and carrying out heat preservation for 1h), thus preparing the metal ceramic.
And (3) performance testing: the indentation toughness of the obtained cermet is 16.82 +/-0.31 MPa-m1/2The indentation morphology is shown in FIG. 3, the indentation hardness is 18.32 +/-0.65 GPa, and the density is 6.78g/cm3
Example 4
1. According to 52 wt% TiC0.7N0.315 wt% WC, 6.5 wt% Ni, 6.5 wt% Co, 6.5 wt% Mo2C, 5 wt% VC, 1.5 wt% AlN, and 7 wt% (Ta)0.2W0.2V0.2Mo0.2Nb0.2) C, preparing powder of the high-entropy carbide (prepared in example 1) to obtain mixed powder; adding WC-Co hard alloy balls (YG8) with the diameters of 5mm and 10mm and absolute ethyl alcohol into the mixed powder according to the ball wine material mass ratio of 5:2:1, and carrying out roller ball milling on the mixed powder for 24 hours;
2. carrying out rotary evaporation treatment on the ball-milled slurry, and then drying the ball-milled slurry in a drying oven at 60 ℃ for 12 hours to obtain dry powder;
3. sieving the dried powder with a 100-mesh sieve, pressing into a green body by keeping the pressure for 20s at 60MPa and keeping the pressure for 5min at 250MPa through cold isostatic pressing, fully wrapping with carbon powder, and pressing into a green body by keeping the pressure for 20s at 10 MPa;
4. and (3) putting the blank into a vacuum furnace, sintering at the temperature of 1550 ℃, and carrying out heat preservation for 2h (the specific heating and heat preservation time is 0-800 ℃, heating for 1.5h, 800-.
And (3) performance testing: the indentation toughness of the obtained cermet is 15.66 +/-0.46 MPa-m1/2The indentation crack propagation is shown in FIG. 4, the indentation hardness is 18.05 +/-0.65 GPa, and the density is 6.64g/cm3
Example 5
1. In an amount of 55 wt% TiC0.7N0.315 wt% WC, 6.5 wt% Ni, 6.5 wt% Co, 6.5 wt% Mo2C, 5 wt% VC, 1.5 wt% AlN, and 4wt%(Ta0.2W0.2V0.2Mo0.2Nb0.2) C, preparing powder of the high-entropy carbide (prepared in example 1) to obtain mixed powder; adding WC-Co hard alloy balls (YG8) with the diameters of 5mm and 10mm and absolute ethyl alcohol into the mixed powder according to the ball wine material mass ratio of 5:2:1, and carrying out roller ball milling on the mixed powder for 24 hours;
2. carrying out rotary evaporation treatment on the ball-milled slurry, and then drying the ball-milled slurry in a drying oven at 60 ℃ for 12 hours to obtain dry powder;
3. sieving the dried powder with a 100-mesh sieve, pressing into a green body by keeping the pressure for 20s at 60MPa and keeping the pressure for 5min at 250MPa through cold isostatic pressing, fully wrapping with carbon powder, and pressing into a green body by keeping the pressure for 20s at 10 MPa;
4. and (3) placing the blank into a vacuum furnace, sintering at 1450 ℃, and preserving heat for 3h (the specific heating and preserving time is 0-800 ℃ for 1.5h, 800-.
And (3) performance testing: the indentation toughness of the obtained cermet is 15.18 +/-0.35 MPa-m1/2The indentation hardness is 17.88 +/-0.65 GPa, and the density is 6.49g/cm3
Example 6
1. In an amount of 60 wt% TiC0.7N0.38 wt% WC, 6.5 wt% Ni, 6.5 wt% Co, 6.5 wt% Mo2C, 5 wt% VC, 1.5 wt% AlN, and 6 wt% (Ta)0.2W0.2V0.2Mo0.2Nb0.2) C, preparing powder of the high-entropy carbide (prepared in example 1) to obtain mixed powder; adding WC-Co hard alloy balls (YG8) with the diameters of 5mm and 10mm and absolute ethyl alcohol into the mixed powder according to the ball wine material mass ratio of 5:2:1, and carrying out roller ball milling on the mixed powder for 24 hours;
2. carrying out rotary evaporation treatment on the ball-milled slurry, and then drying the ball-milled slurry in a drying oven at 60 ℃ for 12 hours to obtain dry powder;
3. sieving the dried powder with a 100-mesh sieve, pressing into a green body by keeping the pressure for 20s at 60MPa and keeping the pressure for 5min at 250MPa through cold isostatic pressing, fully wrapping with carbon powder, and pressing into a green body by keeping the pressure for 20s at 10 MPa;
4. and (3) placing the blank into a vacuum furnace, sintering at 1450 ℃, and preserving heat for 2h (the specific heating and preserving time is 0-800 ℃ for 2.5h, 800-.
And (3) performance testing: the indentation toughness of the obtained cermet is 12.57 +/-0.23 MPa-m1/2The indentation hardness is 17.49 +/-0.13 GPa, and the density is 6.25g/cm3
Comparative example
1. According to 59 wt% TiC0.7N0.315 wt% WC, 6.5 wt% Ni, 6.5 wt% Co, 6.5 wt% Mo2C, 5 wt% VC, 1.5 wt% AlN, and 0 wt% (Ta)0.2W0.2V0.2Mo0.2Nb0.2) C, preparing powder of the high-entropy carbide (prepared in example 1) to obtain mixed powder; adding WC-Co hard alloy balls (YG8) with the diameters of 5mm and 10mm and absolute ethyl alcohol into the mixed powder according to the ball wine material mass ratio of 5:2:1, and carrying out roller ball milling on the mixed powder for 24 hours;
2. carrying out rotary evaporation treatment on the ball-milled slurry, and then drying the ball-milled slurry in a drying oven at 60 ℃ for 12 hours to obtain dry powder;
3. sieving the dried powder with a 100-mesh sieve, pressing into a green body by keeping the pressure for 20s at 60MPa and keeping the pressure for 5min at 250MPa through cold isostatic pressing, fully wrapping with carbon powder, and pressing into a green body by keeping the pressure for 20s at 10 MPa;
4. and (3) placing the blank into a vacuum furnace, sintering at 1450 ℃, and preserving heat for 2h (the specific heating and preserving time is 0-800 ℃ for 2.5h, 800-.
And (3) performance testing: the indentation toughness of the obtained cermet is 9.86 +/-0.35 MPa-m1/2The indentation morphology is shown in FIG. 5, the indentation hardness is 17.06 + -0.34 GPa, and the density is 6.32g/cm3
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (10)

1. A high entropy carbide reinforced TiCN based cermet having high hardness and high toughness characterized by: the metal ceramic is TiC0.7N0.3、WC、Ni、Co、Mo2C. VC, AlN and (Ta)0.2W0.2V0.2Mo0.2Nb0.2) Ball-milling the C high-entropy carbide powder together to obtain mixed powder, drying, performing dry pressing and cold isostatic pressing, fully wrapping the green body with carbon powder, sintering at 1450-1600 ℃, and preserving heat to obtain the carbon powder; the TiC0.7N0.3、WC、Ni、Co、Mo2C. VC, AlN and (Ta)0.2W0.2V0.2Mo0.2Nb0.2) The mass ratio of C is (45-60) to (8-16): 6.5:6.5:6.5:5 (1-2) to (3-13); said (Ta)0.2W0.2V0.2Mo0.2Nb0.2) Passing C high-entropy carbide powder through Ta2O5、V2O5、WO3、Nb2O5、MoO3And C, mixing and ball-milling the six kinds of powder, drying and then preparing the powder by a carbothermic reduction method at 1600-1700 ℃.
2. A high entropy carbide reinforced TiCN based cermet having high hardness and high toughness as claimed in claim 1, wherein: the TiC0.7N0.3、WC、Ni、Co、Mo2C. The grain diameter of VC and AlN powder is 1-3 microns; said Ta2O5、V2O5、WO3、Nb2O5、MoO3The particle size of the powder of C is 0.5-3 microns; said (Ta)0.2W0.2V0.2Mo0.2Nb0.2) The grain diameter of the C high-entropy carbide powder is 0.5-5 microns.
3. A high entropy carbide reinforced TiCN based cermet having high hardness and high toughness as claimed in claim 1, wherein: said (Ta)0.2W0.2V0.2Mo0.2Nb0.2) The C high-entropy carbide is prepared according to the following operation stepsTo:
s1, mixing Ta2O5、V2O5、WO3、Nb2O5、MoO3Mixing the six powder C according to the molar ratio of 0.5:0.5:1:0.5:1:18 to obtain mixed powder; adding WC-Co hard alloy balls and absolute ethyl alcohol into the mixed powder, and carrying out roller ball milling for 24-48 h; the mass ratio of the WC-Co hard alloy balls to the absolute ethyl alcohol to the mixed powder is 6:3: 1;
s2, performing rotary evaporation treatment on the ball-milled slurry, and then drying the ball-milled slurry in a drying oven at the temperature of 60-100 ℃ to obtain dry powder;
s3, screening the dried powder through a 100-sand 200-mesh sieve, and performing dry pressing at 8-20MPa to obtain a blank;
s4, placing the blank into a vacuum furnace, and carrying out heat preservation at the temperature of 1600-1700 ℃ for 1-2h to prepare (Ta)0.2W0.2V0.2Mo0.2Nb0.2) C high entropy carbide block;
s5, mixing (Ta)0.2W0.2V0.2Mo0.2Nb0.2) Crushing and grinding the C high-entropy carbide block, and sieving with a 100-200-mesh sieve to obtain (Ta)0.2W0.2V0.2Mo0.2Nb0.2) C high entropy carbide powder.
4. The production method according to claim 3, characterized in that: the diameters of the WC-Co hard alloy balls in the step S1 are 5mm and 10mm, and the mass ratio of the two balls is 1: 2;
the drying time in the step S2 is 12-24 h;
the dwell time of the dry pressure in step S3 is 20-60S.
5. A method of preparing a high entropy carbide reinforced TiCN based cermet having high hardness and high toughness according to claim 1, characterized by comprising the following steps:
S1.TiC0.7N0.3WC, Ni, Co, Mo2C, VC, AlN and (Ta)0.2W0.2V0.2Mo0.2Nb0.2) C, preparing the high-entropy carbide powder to obtain mixed powder; adding WC-Co hard alloy balls (YG8) and absolute ethyl alcohol into the mixed powder, and carrying out roller ball milling for 24-48 h; the mass ratio of the WC-Co hard alloy balls to the absolute ethyl alcohol to the mixed powder is 5:2: 1;
s2, performing rotary evaporation treatment on the ball-milled slurry, and then drying the ball-milled slurry in a drying oven at the temperature of 60-100 ℃ to obtain dry powder;
s3, after the dried powder passes through a sieve with the temperature of 100-;
s4, placing the blank into a vacuum furnace, and sintering at 1450-1600 ℃ to obtain the high-entropy carbide reinforced TiCN-based metal ceramic with high hardness and high toughness.
6. The method of claim 5, wherein: the diameters of the WC-Co hard alloy balls in the step S1 are 5mm and 10mm, and the mass ratio of the two balls is 1: 2.
7. The method of claim 5, wherein: the drying time in step S2 is 12-24 h.
8. The method of claim 5, wherein: the pressure maintaining time of the dry pressure in the step S3 is 20S-60S, and the pressure maintaining time of the cold isostatic pressing is 5-15 min; and 5-15MPa and 20-60s pressure maintaining and pressing molding are adopted in the process of fully wrapping the blank by the carbon powder.
9. The method of claim 5, wherein: the sintering time in the step S4 is 1-4.5 h.
10. Use of a high entropy carbide reinforced TiCN based cermet having high hardness and high toughness according to any one of claims 1 to 3 in the field of cutter cutting.
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