CN107475548A - A kind of preparation method of nanometer of toughness reinforcing Ultra-fine Grained WC Co hard alloy - Google Patents
A kind of preparation method of nanometer of toughness reinforcing Ultra-fine Grained WC Co hard alloy Download PDFInfo
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- CN107475548A CN107475548A CN201710504081.2A CN201710504081A CN107475548A CN 107475548 A CN107475548 A CN 107475548A CN 201710504081 A CN201710504081 A CN 201710504081A CN 107475548 A CN107475548 A CN 107475548A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
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- C—CHEMISTRY; METALLURGY
- 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
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
Abstract
The invention discloses the preparation method of a kind of nanometer of toughness reinforcing Ultra-fine Grained WC Co hard alloy, specifically include：The superfine powder of 0.1~0.5 μm of jet mill grinding method and hydraulic atomized method preparation is respectively adopted with Co Binder Phases for WC hard phases, wax and drying and screening, molding and cold isostatic compaction and pressure sintering being mixed by dispensing, addition nano metal additive package, the mixed powder sieving of air-flow, ball milling afterwards and ultra-fine cemented carbide being made with heat treatment, wherein nano metal additive package uses vacuum arc melting ingot casting+quick-in situ packaging plasma arc method to prepare.Nano metal additive package plays a part of refining hard alloy crystal grain, improves material wellability, reduces voidage and strengthen alloy part grain-boundary strength, so as to substantially increase the macro properties such as the hardness of alloy, bending strength and fracture toughness.This method has the characteristics that production efficiency is high, production cost is low, product quality and purity are high, and saves substantial amounts of man-hour and energy consumption.
Description
Technical field
The present invention relates to a kind of hard alloy preparing technical field, specifically directly adds the alloy that various metals form
Nanometer additive generates the obdurability WC-Co hard alloy preparation method of Grain-Boundary Phase, especially prepares obdurability Ultra-fine Grained hard
The method of alloy.
Background technology
Hard alloy has high rigidity, high intensity, high-wearing feature, strong corrosion resistance and the advantages such as thermal coefficient of expansion is low, mesh
It is preceding be widely used in cutting tool, bore tooth and ore crushing machine etc., be intermetallic composite coating, oil drilling, mining etc. no
The important materials that can lack.However, hard alloy belongs to fragile material, the bad bottleneck of its performance be between hardness and intensity i.e.
There is contradiction between wearability and toughness：Ordinary rigid alloy rigidity height then low strength, and intensity height then lower hardness.
Research is found, in the case where cobalt phase content is constant, when WC grain is dropped to below 1 μm, and the hardness of hard alloy
Then improved simultaneously with intensity, and the amplitude of this raising further reduces and more obvious with grain size.However, due to system
Powder is easily grown up in standby sintering process of ultrafine hard alloy, causes the complex process for obtaining the hard alloy of small grains, note
Item of anticipating is various, and technological parameter requires high so that producer will significantly more new equipment it is general right so that cost is increased sharply
Had little significance in actual production.
It is one of effective way for improving alloy property that metallic addition is added in hard alloy, and metallic addition is to hard
The influence of matter alloy property at many aspects disclosed in numerous scientific workers, as metallic addition can improve the resistance to of alloy
Mill property, impact resistance, high-temperature behavior, cutting ability etc..Conventional metallic addition have W, Mo, Cr, V, Nb, Ta, Al, Cu, Ru,
Zr, Re and rare earth metal etc.：Addition W improves the temperature in use of hard alloy, enhances the high-temperature behavior of alloy；Mo's is main
Wetability of the liquid metal to TiC hard phases when effect is to improve sintering；Cr is added in hard alloy can obtain physics, machine
Tool and the good alloy of performance；V, Nb and Ta are added in hardmetall binder, they can make carbon in sintering process
Compound produces gradient distribution, enhances the stability of alloy；A1 differs larger with Co atomic radius, Al to Co matrixes compared with
Good invigoration effect；Cu is added in TiC base cemented carbides can improve the wearability of hard alloy；To WC-Co hard alloy
Middle addition Ru can strengthen the ability of the thermal fatigue resistance of alloy；A small amount of Re is added in hard alloy can increase hard alloy
Hardness and wearability；Rare earth element is added in hard alloy, can greatly improve alloy high-temp intensity and inoxidizability, not
, can the larger toughness for improving alloy in the case of reducing hardness.
Experiment shows, nano-particle, hardness, wearability, the toughness of composite are suitably added in hard alloy substrate
It is significantly improved.The use of nanometer additive is low compared with the usage amount of common additives, and and WC grain（Great circle）Gap it is small,
Arrangement is finer and close, and the size of common additives easily forms formation of crack almost with WC same orders.Therefore, with it simply
Pursue and hard alloy particulate is completely formed nanoscale, change not as attempting the addition nano-element progress nanosizing in hard alloy
Property, the purpose for neither improving very big cost and can improvement performance is reached with this.The present invention develops cashier according to above thinking
Meter Zeng Ren WC-Co hard alloys prepare new technology, the process to improve China's hard carbide industry production technology level,
High quality down-stream processing with high added-value hart metal product is developed, improves competitiveness, reverses in the unfavorable situation in international market, realizes
The benign cycle of raw material finished product, tool are of great significance.
The content of the invention
The purpose of the present invention is that the current situation that high-performance carbide technology is prepared for metal nano doping provides one
Plant simple technique, additive utilization rate height, energy-conserving and environment-protective, the preparation for having high tenacity and high-wearing feature hard alloy concurrently of low cost
Method.
The technical scheme is that：Directly various metals are added into the WC-Co hard alloy of common submicron order
Composite nanometer additive prepares a kind of method of high-performance carbide, and specific steps include：
（1）By particle diameter less than 5mm WC coarse powder material respectively by JZDB-100 types airflow milling in 0.7~0.8MPa operating pressures, grind
The fine powder material that particle mean size is 0.1~0.5 μm is milled under mill room oxygen content≤10ppm high-purity argon gas protection；
（2）Binder Phase Co powder is prepared using the hydraulic atomized production line of JTSWH-50 types, and high-pressure water pressure is under argon gas protection
50~80MPa, prepare the spherical fine powder material that particle mean size is 0.1~0.5 μm；
（3）The mixing of R-M nano metals is prepared using vacuum arc melting ingot casting+quick-in situ packaging plasma arc method
Powder；
（4）, will using HDQH-1 type impulse type rapids airflow mixer in argon gas protects atmosphere（1）With（2）WC made from step
Hard phase and Co Binder Phases fine powder material press WCxCoyRatio is same（3）R-M nano metals additive package is uniformly mixed made from step
Close 5~10 minutes, the rear mesh sieve of mistake 200；
（5）By step（4）In mixed-powder add in agitating ball mill, abrasive media is WC-Co hard alloy ball, ratio of grinding media to material
For 4~6：1, using ethane as abrasive media, paraffin is added, carries out 2~3 agitation grindings, the agitation grinding time is 1~6 hour,
Form slurry, then filtering, under conditions of 50~220 DEG C through atomization drying or vacuum desiccator it is dry, cross 100 mesh sieves, system
Into carbide alloy mixture grain；
（6）Will（5）Compound made from step is suppressed using XY40 Full-automatic hydraulics powder former, pressure 25MPa, by
Green compact are made in 300MPa isostatic cool pressings；
（7）Green compact are fitted into pressure sintering furnace, dewaxing treatment is carried out under negative pressure of vacuum, 350~450 DEG C × 1~2h, it is follow-up
It is continuous to vacuumize heating；Gas disposal is carried out under negative pressure of vacuum, 1000~1100 DEG C × 0.3~0.6h, and continues to heat up；
Solid-phase sintering, rear applying argon gas to -0.06MPa are carried out under 1150~1250 DEG C × 0.3~0.7h, and continue to heat up；When temperature reaches
Argon gas is filled with during to setting sintering temperature into body of heater, and is 3~10MPa, 1280~1420 DEG C × 1~2h bars in furnace pressure
900 DEG C are naturally cooled to after being sintered under part, it is rear open outer circulation cooling improve cooldown rate make furnace temperature be down to 100 DEG C with
Under；Finally it is heat-treated twice：It is for the first time Quenching Treatment：950~1050 DEG C × 0.1~0.5h；Second is at tempering
Reason：300~500 DEG C × 3~5h, as superfine WC-Co cemented carbide finished product.
WC as described abovexCoyMiddle x, y are mass percent, and x=70~99%, y=1~30%.
Above-mentioned nano metal additive package R-M average grain diameters are 30~80nm, and each element purity is all higher than 99.9wt%,
Wherein R-M（R represents rare earth element La and Ce, Pr, Nd, Gd, Tb, Dy, Ho, Y, Sc, Er, Lu, Sm, Tm, Yb, Eu one kind or more
Kind；M：Fe, Ni, Co, Al, Cu, Cr, Ta, Nb, V, Ti, Ru, Re, Zr, Zn, Mg are one or more）Nano metal mixed powder R（R
Represent rare earth element）, Fe, Ni, Co, Al, Cu, Cr, Ta, Nb, V, Ti, Ru, Re, Zr, Zn, Mg element addition account for Co bonding
The percentage range of phase fine powder material quality is respectively a=0.1~2%, b=0~30%, c=0~30%, d=0~30%, e=0~20%, f
=0~20%, g=0~5%, h=0~5%, i=0~5%, j=0~5%, k=0~5%, l=0~20%, m=0~20%, n=0~10%, o=
0~10%, p=0~10%.
The present invention has the following advantages that compared with prior art：
1st, compared with superfine WC-Co cemented carbide technology of preparing compare, the inventive method can not only produce particle mean size and be
Less than 0.5 μm of superfine WC power, and productivity ratio can more traditional ball-milling method improve 4~5 times, and output capacity is up to more than 99.5%,
Production cost can reduce by 50% or so；The powder fineness of preparation is uniform, and granularity normal distribution is narrower, grain shape rule, purity
High, active big, good dispersion.Simultaneously as air-flow disintegrating machine is material to be crushed, powder according to the autogenous grinding principle of material
Body is contaminated few.Thus the present invention has that production efficiency is high, with short production cycle, production cost is low, and product quality and purity are high
The features such as, and save substantial amounts of man-hour and energy consumption.
2nd, compared with conventional superfine WC-Co cemented carbide, hardness improves nanometer toughness reinforcing WC-Co hard alloy of the present invention
1.0 more than HRA, bending strength improve about 20~30% or so with fracture toughness, and wearability improves more than 150%, and service life carries
It is high by 80%.
3rd, because the nano particle pinning of nano metal compound additive is in WC grain boundaries, cause in sintering process
Its aggregation growth is hindered, and WC grain nucleation speed is far longer than growth rate, so as to refine hard alloy crystal grain,
Make alloy microstructure become evenly, it is fine and close, the wellability of material is effectively improved, and reduces voidage, metallurgy melts
Conjunction property is good, does not have the defects of obvious empty, so as to improve the hardness of material, wearability and combination property.
4th, because the local grain-boundary strength of nano-particle is especially high, after adding nano metal compound additive, hard alloy
Fracture mode by based on grain boundary fracture turn to based on transgranular fracture, meanwhile, bifurcated turn to the micro-crack to be formed due to increase
Break surface is added, has absorbed more multi-energy, therefore formd the dissipation mechanism of impact energy, so as to serve toughening effect.
5th, the new method that the multiple metallic element mixed nanometer prepares high-performance superfine cemented carbide solves single nanometer
Metallic element doping, which improves alloy property, has the problem of limitation, and for multiple metallic element mixed nanometer, solve more golden
Doping process between category element nano-powder, between nano-powder and sub-micron alloyed powder is comparatively laborious, repeatedly adulterates process
The problems such as middle metal nano powder is easy to oxidation and is mixed into impurity, and conventional sintering process crystal grain is easily grown up, makes powder after mixing
Body composition is uniform, and the alloy after sintering has higher performance and preferable uniformity.
6th, compared with conventional cemented carbide preparation method, the multiple metallic element mixed nanometer toughness reinforcing ultra-fine crystal WC-Co hard
The novel preparation method of alloy can mix the composition of nanometer metal additive alloy by adjusting, and use the same oligomict alloy of letter
More trade mark hart metal products are prepared, the production technology and management intensity of dispensing and powder process processed is enormously simplify, can be applied to
The preparation of other performance trade mark hard alloy.
Embodiment
Invention will be described in further detail by example below, but following examples is only present invention example therein
Son, does not represent the rights protection scope limited of the invention, the scope of the present invention using claims as
It is accurate.
Embodiment 1：
（1）By WC coarse powder material of the particle diameter less than 5mm respectively by JZDB-100 types airflow milling in 0.75MPa operating pressures, grinding chamber
The fine powder material that particle mean size is 0.2 μm is milled under oxygen content≤10ppm high-purity argon gas protection；
（2）Binder Phase Co powder is prepared using the hydraulic atomized production line of JTSWH-50 types, and high-pressure water pressure is under argon gas protection
80MPa, prepare the spherical fine powder material that particle mean size is 0.2 μm；
（3）Use vacuum arc melting ingot casting+quick-in situ packaging plasma arc method prepare average grain size for
50nm Ce-V nano metal mixed powders；
（4）, will using HDQH-1 type impulse type rapids airflow mixer in argon gas protects atmosphere（1）With（2）WC made from step
Hard phase and Co Binder Phases fine powder material press WC94Co6.0（wt%）Ratio is same（3）Co Binder Phase fine powder materials quality 6.5% is accounted for made from step
Ce-V nano metals additive package carry out uniformly mixing 5 minutes, the rear mesh sieve of mistake 200；
（5）By step（4）In mixed-powder add in agitating ball mill, abrasive media is WC-Co hard alloy ball, ratio of grinding media to material
For 5：1, using ethane as abrasive media, paraffin is added, carries out 3 agitation grindings, the agitation grinding time is 3 hours, forms slurry,
Then filtering, under conditions of 200 DEG C through atomization drying, cross 100 mesh sieves, carbide alloy mixture grain is made；
（6）Will（5）Compound made from step is suppressed using XY40 Full-automatic hydraulics powder former, pressure 25MPa, by
Green compact are made in 300MPa isostatic cool pressings；
（7）Green compact are fitted into pressure sintering furnace, dewaxing treatment is carried out under negative pressure of vacuum, 400 DEG C × 2h, after continue to vacuumize
Heating；Gas disposal is carried out under negative pressure of vacuum, 1100 DEG C × 0.5h, and continues to heat up；Consolidated under 1250 DEG C × 0.5h
Phase sintering, rear applying argon gas to -0.06MPa, and continue to heat up；Argon is filled with into body of heater when temperature reaches setting sintering temperature
Gas, and 900 DEG C are naturally cooled to after being sintered under the conditions of furnace pressure is 5MPa, 1400 DEG C × 2h, outer circulation is opened afterwards
Cooling, which improves cooldown rate, to be made to ask temperature drop to less than 100 DEG C；Finally it is heat-treated twice：It is for the first time Quenching Treatment：1050
℃×0.3h；Second is temper：500℃×5h.
Comparative example 1：
Identical raw material are pressed into WC94Co6.0（wt%）Ratio carries out dispensing, afterwards using traditional wet-milling, shaping, vacuum-sintering etc.
Method prepares the superfine WC-Co cemented carbide for being not added with nano metal additive package, and the performance of itself and embodiment 1 is made
Compare, comparative result is as shown in table 1：
The comparison of the embodiment 1 of table 1. and the grain size of comparative example 1 and mechanical property
| Title | Grain size（μm） | Hardness（HRA） | Bending strength（MPa） | Fracture toughness（MPa/m2） |
| Embodiment 1 | 0.45 | 94.5 | 3700 | 11.0 |
| Comparative example 1 | 0.50 | 93.0 | 3000 | 9.0 |
Embodiment 2：
（1）By WC coarse powder material of the particle diameter less than 5mm respectively by JZDB-100 types airflow milling in 0.75MPa operating pressures, grinding chamber
The fine powder material that particle mean size is 0.2 μm is milled under oxygen content≤10ppm high-purity argon gas protection；
（2）Binder Phase Co powder is prepared using the hydraulic atomized production line of JTSWH-50 types, and high-pressure water pressure is under argon gas protection
80MPa, prepare the spherical fine powder material that particle mean size is 0.2 μm；
（3）Use vacuum arc melting ingot casting+quick-in situ packaging plasma arc method prepare average grain size for
50nm Y-Ce-Co-V nano metal mixed powders；
（4）, will using HDQH-1 type impulse type rapids airflow mixer in argon gas protects atmosphere（1）With（2）WC made from step
Hard phase and Co Binder Phases fine powder material press WC94Co6.0（wt%）Ratio is same（3）Co Binder Phase fine powder materials quality 27% is accounted for made from step
Y-Ce-Al-Co-V nano metals additive package carry out uniformly mixing 8 minutes, the rear mesh sieve of mistake 200；
（5）By step（4）In mixed-powder add in agitating ball mill, abrasive media is WC-Co hard alloy ball, ratio of grinding media to material
For 5：1, using ethane as abrasive media, paraffin is added, carries out 3 agitation grindings, the agitation grinding time is 5 hours, forms slurry,
Then filtering, under conditions of 200 DEG C through atomization drying, cross 100 mesh sieves, carbide alloy mixture grain is made；
（6）Will（5）Compound made from step is suppressed using XY40 Full-automatic hydraulics powder former, pressure 25MPa, by
Green compact are made in 300MPa isostatic cool pressings；
（7）Green compact are fitted into pressure sintering furnace, dewaxing treatment is carried out under negative pressure of vacuum, 400 DEG C × 2h, after continue to vacuumize
Heating；Gas disposal is carried out under negative pressure of vacuum, 1080 DEG C × 0.5h, and continues to heat up；Consolidated under 1230 DEG C × 0.5h
Phase sintering, rear applying argon gas to -0.06MPa, and continue to heat up；Argon is filled with into body of heater when temperature reaches setting sintering temperature
Gas, and 900 DEG C are naturally cooled to after being sintered under the conditions of furnace pressure is 5MPa, 1380 DEG C × 2h, outer circulation is opened afterwards
Cooling, which improves cooldown rate, to be made to ask temperature drop to less than 100 DEG C；Finally it is heat-treated twice：It is for the first time Quenching Treatment：1050
℃×0.3h；Second is temper：500℃×5h.
Comparative example 2：
Identical raw material are pressed into WC94Co6.0（wt%）Ratio carries out dispensing, afterwards using traditional wet-milling, shaping, vacuum-sintering etc.
Method prepares the superfine WC-Co cemented carbide for being not added with nano metal additive package, and the performance of itself and embodiment 2 is made
Compare, comparative result is as shown in table 2：
The comparison of the embodiment 2 of table 2. and the grain size of comparative example 2 and mechanical property
| Title | Grain size（μm） | Hardness（HRA） | Bending strength（MPa） | Fracture toughness（MPa/m2） |
| Embodiment 2 | 0.40 | 94.3 | 3800 | 11.3 |
| Comparative example 2 | 0. 50 | 93.0 | 3000 | 9.0 |
Embodiment 3：
（1）By WC coarse powder material of the particle diameter less than 5mm respectively by JZDB-100 types airflow milling in 0.75MPa operating pressures, grinding chamber
The fine powder material that particle mean size is 0.2 μm is milled under oxygen content≤10ppm high-purity argon gas protection；
（2）Binder Phase Co powder is prepared using the hydraulic atomized production line of JTSWH-50 types, and high-pressure water pressure is under argon gas protection
80MPa, prepare the spherical fine powder material that particle mean size is 0.2 μm；
（3）Use vacuum arc melting ingot casting+quick-in situ packaging plasma arc method prepare average grain size for
50nm Sm-Cr nano metal mixed powders；
（4）, will using HDQH-1 type impulse type rapids airflow mixer in argon gas protects atmosphere（1）With（2）WC made from step
Hard phase and Co Binder Phases fine powder material press WC92Co8.0（wt%）Ratio is same（3）Co Binder Phase fine powder materials quality 6% is accounted for made from step
Sm-Cr nano metals additive package carries out uniformly mixing 8 minutes, the rear mesh sieve of mistake 200；
（5）By step（4）In mixed-powder add in agitating ball mill, abrasive media is WC-Co hard alloy ball, ratio of grinding media to material
For 5：1, using ethane as abrasive media, paraffin is added, carries out 3 agitation grindings, the agitation grinding time is 5 hours, forms slurry,
Then filtering, under conditions of 200 DEG C through atomization drying, cross 100 mesh sieves, carbide alloy mixture grain is made；
（6）Will（5）Compound made from step is suppressed using XY40 Full-automatic hydraulics powder former, pressure 25MPa, by
Green compact are made in 300MPa isostatic cool pressings；
（7）Green compact are fitted into pressure sintering furnace, dewaxing treatment is carried out under negative pressure of vacuum, 400 DEG C × 2h, after continue to vacuumize
Heating；Gas disposal is carried out under negative pressure of vacuum, 1080 DEG C × 0.5h, and continues to heat up；Consolidated under 1230 DEG C × 0.5h
Phase sintering, rear applying argon gas to -0.06MPa, and continue to heat up；Argon is filled with into body of heater when temperature reaches setting sintering temperature
Gas, and 900 DEG C are naturally cooled to after being sintered under the conditions of furnace pressure is 5MPa, 1380 DEG C × 2h, outer circulation is opened afterwards
Cooling, which improves cooldown rate, to be made to ask temperature drop to less than 100 DEG C；Finally it is heat-treated twice：It is for the first time Quenching Treatment：1050
℃×0.3h；Second is temper：500℃×5h.
Comparative example 3：
Identical raw material are pressed into WC92Co8.0（wt%）Ratio carries out dispensing, afterwards using traditional wet-milling, shaping, vacuum-sintering etc.
Method prepares the superfine WC-Co cemented carbide for being not added with nano metal additive package, and the performance of itself and embodiment 3 is made
Compare, comparative result is as shown in table 3：
The comparison of the embodiment 3 of table 3. and the grain size of comparative example 3 and mechanical property
| Title | Grain size（μm） | Hardness（HRA） | Bending strength（MPa） | Fracture toughness（MPa/m2） |
| Embodiment 3 | 0.40 | 94.0 | 3900 | 11.4 |
| Comparative example 3 | 0.40 | 92.5 | 3200 | 9.3 |
Embodiment 4：
（1）By WC coarse powder material of the particle diameter less than 5mm respectively by JZDB-100 types airflow milling in 0.75MPa operating pressures, grinding chamber
The fine powder material that particle mean size is 0.2 μm is milled under oxygen content≤10ppm high-purity argon gas protection；
（2）Binder Phase Co powder is prepared using the hydraulic atomized production line of JTSWH-50 types, and high-pressure water pressure is under argon gas protection
80MPa, prepare the spherical fine powder material that particle mean size is 0.2 μm；
（3）Use vacuum arc melting ingot casting+quick-in situ packaging plasma arc method prepare average grain size for
50nm Sm-Nd-Ni-Cr nano metal mixed powders；
（4）, will using HDQH-1 type impulse type rapids airflow mixer in argon gas protects atmosphere（1）With（2）WC made from step
Hard phase and Co Binder Phases fine powder material press WC92Co8.0（wt%）Ratio is same（3）Co Binder Phase fine powder material quality is accounted for made from step
21.5% Sm-Nd-Ni-Cr nano metals additive package carries out uniformly mixing 8 minutes, the rear mesh sieve of mistake 200；
（5）By step（4）In mixed-powder add in agitating ball mill, abrasive media is WC-Co hard alloy ball, ratio of grinding media to material
For 5：1, using ethane as abrasive media, paraffin is added, carries out 3 agitation grindings, the agitation grinding time is 5 hours, forms slurry,
Then filtering, under conditions of 200 DEG C through atomization drying, cross 100 mesh sieves, carbide alloy mixture grain is made；
（6）Will（5）Compound made from step is suppressed using XY40 Full-automatic hydraulics powder former, pressure 25MPa, by
Green compact are made in 300MPa isostatic cool pressings；
（7）Green compact are fitted into pressure sintering furnace, dewaxing treatment is carried out under negative pressure of vacuum, 400 DEG C × 2h, after continue to vacuumize
Heating；Gas disposal is carried out under negative pressure of vacuum, 1070 DEG C × 0.5h, and continues to heat up；Consolidated under 1220 DEG C × 0.5h
Phase sintering, rear applying argon gas to -0.06MPa, and continue to heat up；Argon is filled with into body of heater when temperature reaches setting sintering temperature
Gas, and 900 DEG C are naturally cooled to after being sintered under the conditions of furnace pressure is 5MPa, 1370 DEG C × 2h, outer circulation is opened afterwards
Cooling, which improves cooldown rate, to be made to ask temperature drop to less than 100 DEG C；Finally it is heat-treated twice：It is for the first time Quenching Treatment：1050
℃×0.3h；Second is temper：500℃×5h.
Comparative example 4：
Identical raw material are pressed into WC92Co8.0（wt%）Ratio carries out dispensing, afterwards using traditional wet-milling, shaping, vacuum-sintering etc.
Method prepares the superfine WC-Co cemented carbide for being not added with nano metal additive package, and the performance of itself and embodiment 4 is made
Compare, comparative result is as shown in table 4：
The comparison of the embodiment 4 of table 4. and the grain size of comparative example 4 and mechanical property
| Title | Grain size（μm） | Hardness（HRA） | Bending strength（MPa） | Fracture toughness（MPa/m2） |
| Embodiment 4 | 0.42 | 93.8 | 4000 | 11.7 |
| Comparative example 4 | 0.4 | 92.5 | 3200 | 9.3 |
Embodiment 5：
（1）By WC coarse powder material of the particle diameter less than 5mm respectively by JZDB-100 types airflow milling in 0.75MPa operating pressures, grinding chamber
The fine powder material that particle mean size is 0.2 μm is milled under oxygen content≤10ppm high-purity argon gas protection；
（2）Binder Phase Co powder is prepared using the hydraulic atomized production line of JTSWH-50 types, and high-pressure water pressure is under argon gas protection
80MPa, prepare the spherical fine powder material that particle mean size is 0.2 μm；
（3）Use vacuum arc melting ingot casting+quick-in situ packaging plasma arc method prepare average grain size for
60nm La-Nb nano metal mixed powders；
（4）, will using HDQH-1 type impulse type rapids airflow mixer in argon gas protects atmosphere（1）With（2）WC made from step
Hard phase and Co Binder Phases fine powder material press WC90Co10（wt%）Ratio is same（3）Co Binder Phase fine powder materials quality 6.2% is accounted for made from step
La-Nb nano metals additive package carry out uniformly mixing 8 minutes, the rear mesh sieve of mistake 200；
（5）By step（4）In mixed-powder add in agitating ball mill, abrasive media is WC-Co hard alloy ball, ratio of grinding media to material
For 5：1, using ethane as abrasive media, paraffin is added, carries out 3 agitation grindings, the agitation grinding time is 5 hours, forms slurry,
Then filtering, under conditions of 200 DEG C through atomization drying, cross 100 mesh sieves, carbide alloy mixture grain is made；
（6）Will（5）Compound made from step is suppressed using XY40 Full-automatic hydraulics powder former, pressure 25MPa, by
Green compact are made in 300MPa isostatic cool pressings；
（7）Green compact are fitted into pressure sintering furnace, dewaxing treatment is carried out under negative pressure of vacuum, 400 DEG C × 2h, after continue to vacuumize
Heating；Gas disposal is carried out under negative pressure of vacuum, 1070 DEG C × 0.5h, and continues to heat up；Consolidated under 1220 DEG C × 0.5h
Phase sintering, rear applying argon gas to -0.06MPa, and continue to heat up；Argon is filled with into body of heater when temperature reaches setting sintering temperature
Gas, and 900 DEG C are naturally cooled to after being sintered under the conditions of furnace pressure is 5MPa, 1370 DEG C × 2h, outer circulation is opened afterwards
Cooling, which improves cooldown rate, to be made to ask temperature drop to less than 100 DEG C；Finally it is heat-treated twice：It is for the first time Quenching Treatment：1030
℃×0.3h；Second is temper：450℃×5h.
Comparative example 5：
Identical raw material are pressed into WC90Co10（wt%）Ratio carries out dispensing, afterwards using the side such as traditional wet-milling, shaping, vacuum-sintering
Method prepares the superfine WC-Co cemented carbide for being not added with nano metal additive package, and the performance of itself and embodiment 5 is made into ratio
Compared with comparative result is as shown in table 5：
The comparison of the embodiment 5 of table 5. and the grain size of comparative example 5 and mechanical property
| Title | Grain size（μm） | Hardness（HRA） | Bending strength（MPa） | Fracture toughness（MPa/m2） |
| Embodiment 5 | 0.35 | 93.5 | 4100 | 11.7 |
| Comparative example 5 | 0.45 | 92.0 | 3300 | 9.5 |
Embodiment 6：
（1）By WC coarse powder material of the particle diameter less than 5mm respectively by JZDB-100 types airflow milling in 0.75MPa operating pressures, grinding chamber
The fine powder material that particle mean size is 0.2 μm is milled under oxygen content≤10ppm high-purity argon gas protection；
（2）Binder Phase Co powder is prepared using the hydraulic atomized production line of JTSWH-50 types, and high-pressure water pressure is under argon gas protection
80MPa, prepare the spherical fine powder material that particle mean size is 0.2 μm；
（3）Use vacuum arc melting ingot casting+quick-in situ packaging plasma arc method prepare average grain size for
60nm La-Dy-Fe-Nb nano metal mixed powders；
（4）, will using HDQH-1 type impulse type rapids airflow mixer in argon gas protects atmosphere（1）With（2）WC made from step
Hard phase and Co Binder Phases fine powder material press WC90Co10（wt%）Ratio is same（3）Co Binder Phase fine powder material quality is accounted for made from step
20.5% La-Dy-Fe-Nb nano metals additive package carries out uniformly mixing 8 minutes, the rear mesh sieve of mistake 200；
（5）By step（4）In mixed-powder add in agitating ball mill, abrasive media is WC-Co hard alloy ball, ratio of grinding media to material
For 5：1, using ethane as abrasive media, paraffin is added, carries out 3 agitation grindings, the agitation grinding time is 5 hours, forms slurry,
Then filtering, under conditions of 200 DEG C through atomization drying, cross 100 mesh sieves, carbide alloy mixture grain is made；
（6）Will（5）Compound made from step is suppressed using XY40 Full-automatic hydraulics powder former, pressure 25MPa, by
Green compact are made in 300MPa isostatic cool pressings；
（7）Green compact are fitted into pressure sintering furnace, dewaxing treatment is carried out under negative pressure of vacuum, 400 DEG C × 2h, after continue to vacuumize
Heating；Gas disposal is carried out under negative pressure of vacuum, 1060 DEG C × 0.5h, and continues to heat up；Consolidated under 1200 DEG C × 0.5h
Phase sintering, rear applying argon gas to -0.06MPa, and continue to heat up；Argon is filled with into body of heater when temperature reaches setting sintering temperature
Gas, and 900 DEG C are naturally cooled to after being sintered under the conditions of furnace pressure is 5MPa, 1350 DEG C × 2h, outer circulation is opened afterwards
Cooling, which improves cooldown rate, to be made to ask temperature drop to less than 100 DEG C；Finally it is heat-treated twice：It is for the first time Quenching Treatment：1030
℃×0.3h；Second is temper：450℃×5h.
Comparative example 6：
Identical raw material are pressed into WC90Co10（wt%）Ratio carries out dispensing, afterwards using the side such as traditional wet-milling, shaping, vacuum-sintering
Method prepares the superfine WC-Co cemented carbide for being not added with nano metal additive package, and the performance of itself and embodiment 6 is made into ratio
Compared with comparative result is as shown in table 6：
The comparison of the embodiment 6 of table 6. and the grain size of comparative example 6 and mechanical property
| Title | Grain size（μm） | Hardness（HRA） | Bending strength（MPa） | Fracture toughness（MPa/m2） |
| Embodiment 6 | 0.32 | 93.1 | 4300 | 12.0 |
| Comparative example 6 | 0.45 | 92.0 | 3300 | 9.5 |
Embodiment 7：
（1）By WC coarse powder material of the particle diameter less than 5mm respectively by JZDB-100 types airflow milling in 0.75MPa operating pressures, grinding chamber
The fine powder material that particle mean size is 0.2 μm is milled under oxygen content≤10ppm high-purity argon gas protection；
（2）Binder Phase Co powder is prepared using the hydraulic atomized production line of JTSWH-50 types, and high-pressure water pressure is under argon gas protection
80MPa, prepare the spherical fine powder material that particle mean size is 0.2 μm；
（3）Use vacuum arc melting ingot casting+quick-in situ packaging plasma arc method prepare average grain size for
60nm La-Ce-Pr-Al-Co-V nano metal mixed powders；
（4）, will using HDQH-1 type impulse type rapids airflow mixer in argon gas protects atmosphere（1）With（2）WC made from step
Hard phase and Co Binder Phases fine powder material press WC88Co12（wt%）Ratio is same（3）Co Binder Phase fine powder materials quality 27% is accounted for made from step
La-Ce-Pr-Al-Co-V nano metals additive package carry out uniformly mixing 10 minutes, the rear mesh sieve of mistake 200；
（5）By step（4）In mixed-powder add in agitating ball mill, abrasive media is WC-Co hard alloy ball, ratio of grinding media to material
For 5：1, using ethane as abrasive media, paraffin is added, carries out 3 agitation grindings, the agitation grinding time is 6 hours, forms slurry,
Then filtering, under conditions of 200 DEG C through atomization drying, cross 100 mesh sieves, carbide alloy mixture grain is made；
（6）Will（5）Compound made from step is suppressed using XY40 Full-automatic hydraulics powder former, pressure 25MPa, by
Green compact are made in 300MPa isostatic cool pressings；
（7）Green compact are fitted into pressure sintering furnace, dewaxing treatment is carried out under negative pressure of vacuum, 400 DEG C × 2h, after continue to vacuumize
Heating；Gas disposal is carried out under negative pressure of vacuum, 1060 DEG C × 0.5h, and continues to heat up；Consolidated under 1200 DEG C × 0.5h
Phase sintering, rear applying argon gas to -0.06MPa, and continue to heat up；Argon is filled with into body of heater when temperature reaches setting sintering temperature
Gas, and 900 DEG C are naturally cooled to after being sintered under the conditions of furnace pressure is 5MPa, 1350 DEG C × 2h, outer circulation is opened afterwards
Cooling, which improves cooldown rate, to be made to ask temperature drop to less than 100 DEG C；Finally it is heat-treated twice：It is for the first time Quenching Treatment：1000
℃×0.3h；Second is temper：400℃×5h.
Comparative example 7：
Identical raw material are pressed into WC88Co12（wt%）Ratio carries out dispensing, afterwards using the side such as traditional wet-milling, shaping, vacuum-sintering
Method prepares the superfine WC-Co cemented carbide for being not added with nano metal additive package, and the performance of itself and embodiment 7 is made into ratio
Compared with comparative result is as shown in table 7：
The comparison of the embodiment 7 of table 7. and the grain size of comparative example 7 and mechanical property
| Title | Grain size（μm） | Hardness（HRA） | Bending strength（MPa） | Fracture toughness（MPa/m2） |
| Embodiment 7 | 0.30 | 93.0 | 4400 | 12.3 |
| Comparative example 7 | 0.50 | 91.5 | 3500 | 9.8 |
Embodiment 8：
（1）By WC coarse powder material of the particle diameter less than 5mm respectively by JZDB-100 types airflow milling in 0.75MPa operating pressures, grinding chamber
The fine powder material that particle mean size is 0.2 μm is milled under oxygen content≤10ppm high-purity argon gas protection；
（2）Binder Phase Co powder is prepared using the hydraulic atomized production line of JTSWH-50 types, and high-pressure water pressure is under argon gas protection
80MPa, prepare the spherical fine powder material that particle mean size is 0.2 μm；
（3）Use vacuum arc melting ingot casting+quick-in situ packaging plasma arc method prepare average grain size for
60nm La-Ce-Pr-Nd-Al-Co-Zr-V nano metal mixed powders；
（4）, will using HDQH-1 type impulse type rapids airflow mixer in argon gas protects atmosphere（1）With（2）WC made from step
Hard phase and Co Binder Phases fine powder material press WC88Co12（wt%）Ratio is same（3）Co Binder Phase fine powder materials quality 30% is accounted for made from step
La-Ce-Pr-Nd-Al-Co-Zr-V nano metals additive package carry out uniformly mixing 10 minutes, the rear mesh sieve of mistake 200；
（5）By step（4）In mixed-powder add in agitating ball mill, abrasive media is WC-Co hard alloy ball, ratio of grinding media to material
For 5：1, using ethane as abrasive media, paraffin is added, carries out 3 agitation grindings, the agitation grinding time is 6 hours, forms slurry,
Then filtering, under conditions of 200 DEG C through atomization drying, cross 100 mesh sieves, carbide alloy mixture grain is made；
（6）Will（5）Compound made from step is suppressed using XY40 Full-automatic hydraulics powder former, pressure 25MPa, by
Green compact are made in 300MPa isostatic cool pressings；
（7）Green compact are fitted into pressure sintering furnace, dewaxing treatment is carried out under negative pressure of vacuum, 400 DEG C × 2h, after continue to vacuumize
Heating；Gas disposal is carried out under negative pressure of vacuum, 1050 DEG C × 0.5h, and continues to heat up；Consolidated under 1180 DEG C × 0.5h
Phase sintering, rear applying argon gas to -0.06MPa, and continue to heat up；Argon is filled with into body of heater when temperature reaches setting sintering temperature
Gas, and 900 DEG C are naturally cooled to after being sintered under the conditions of furnace pressure is 8MPa, 1330 DEG C × 2h, outer circulation is opened afterwards
Cooling, which improves cooldown rate, to be made to ask temperature drop to less than 100 DEG C；Finally it is heat-treated twice：It is for the first time Quenching Treatment：1000
℃×0.3h；Second is temper：400℃×5h.
Comparative example 8：
Identical raw material are pressed into WC88Co12（wt%）Ratio carries out dispensing, afterwards using the side such as traditional wet-milling, shaping, vacuum-sintering
Method prepares the superfine WC-Co cemented carbide for being not added with nano metal additive package, and the performance of itself and embodiment 8 is made into ratio
Compared with comparative result is as shown in table 8：
The comparison of the embodiment 8 of table 8. and the grain size of comparative example 8 and mechanical property
| Title | Grain size（μm） | Hardness（HRA） | Bending strength（MPa） | Fracture toughness（MPa/m2） |
| Embodiment 8 | 0.32 | 92.8 | 4500 | 12.5 |
| Comparative example 8 | 0.50 | 91.5 | 3500 | 9.8 |
Embodiment 9：
（1）By WC coarse powder material of the particle diameter less than 5mm respectively by JZDB-100 types airflow milling in 0.75MPa operating pressures, grinding chamber
The fine powder material that particle mean size is 0.2 μm is milled under oxygen content≤10ppm high-purity argon gas protection；
（2）Binder Phase Co powder is prepared using the hydraulic atomized production line of JTSWH-50 types, and high-pressure water pressure is under argon gas protection
80MPa, prepare the spherical fine powder material that particle mean size is 0.2 μm；
（3）Use vacuum arc melting ingot casting+quick-in situ packaging plasma arc method prepare average grain size for
60nm Y-Ce-Sm-Nd-Cu-Co-Ta-V nano metal mixed powders；
（4）, will using HDQH-1 type impulse type rapids airflow mixer in argon gas protects atmosphere（1）With（2）WC made from step
Hard phase and Co Binder Phases fine powder material press WC85Co15（wt%）Ratio is same（3）Co Binder Phase fine powder materials quality 33% is accounted for made from step
Y-Ce-Sm-Nd-Cu-Co-Ta-V nano metals additive package carry out uniformly mixing 10 minutes, the rear mesh sieve of mistake 200；
（5）By step（4）In mixed-powder add in agitating ball mill, abrasive media is WC-Co hard alloy ball, ratio of grinding media to material
For 5：1, using ethane as abrasive media, paraffin is added, carries out 3 agitation grindings, the agitation grinding time is 6 hours, forms slurry,
Then filtering, under conditions of 200 DEG C through atomization drying, cross 100 mesh sieves, carbide alloy mixture grain is made；
（6）Will（5）Compound made from step is suppressed using XY40 Full-automatic hydraulics powder former, pressure 25MPa, by
Green compact are made in 300MPa isostatic cool pressings；
（7）Green compact are fitted into pressure sintering furnace, dewaxing treatment is carried out under negative pressure of vacuum, 400 DEG C × 2h, after continue to vacuumize
Heating；Gas disposal is carried out under negative pressure of vacuum, 1050 DEG C × 0.5h, and continues to heat up；Consolidated under 1180 DEG C × 0.5h
Phase sintering, rear applying argon gas to -0.06MPa, and continue to heat up；Argon is filled with into body of heater when temperature reaches setting sintering temperature
Gas, and 900 DEG C are naturally cooled to after being sintered under the conditions of furnace pressure is 8MPa, 1330 DEG C × 2h, outer circulation is opened afterwards
Cooling, which improves cooldown rate, to be made to ask temperature drop to less than 100 DEG C；Finally it is heat-treated twice：It is for the first time Quenching Treatment：1000
℃×0.3h；Second is temper：300℃×5h.
Comparative example 9：
Identical raw material are pressed into WC85Co15（wt%）Ratio carries out dispensing, afterwards using the side such as traditional wet-milling, shaping, vacuum-sintering
Method prepares the superfine WC-Co cemented carbide for being not added with nano metal additive package, and the performance of itself and embodiment 9 is made into ratio
Compared with comparative result is as shown in table 9：
The comparison of the embodiment 9 of table 9. and the grain size of comparative example 9 and mechanical property
| Title | Grain size（μm） | Hardness（HRA） | Bending strength（MPa） | Fracture toughness（MPa/m2） |
| Embodiment 9 | 0.25 | 92.0 | 4700 | 12.9 |
| Comparative example 9 | 0.40 | 90.0 | 3800 | 10.5 |
Embodiment 10：
（1）By WC coarse powder material of the particle diameter less than 5mm respectively by JZDB-100 types airflow milling in 0.75MPa operating pressures, grinding chamber
The fine powder material that particle mean size is 0.2 μm is milled under oxygen content≤10ppm high-purity argon gas protection；
（2）Binder Phase Co powder is prepared using the hydraulic atomized production line of JTSWH-50 types, and high-pressure water pressure is under argon gas protection
80MPa, prepare the spherical fine powder material that particle mean size is 0.2 μm；
（3）Use vacuum arc melting ingot casting+quick-in situ packaging plasma arc method prepare average grain size for
60nm Y-Ce-Sm-Nd-La-Cu-Co-Re-Ti-V nano metal mixed powders；
（4）, will using HDQH-1 type impulse type rapids airflow mixer in argon gas protects atmosphere（1）With（2）WC made from step
Hard phase and Co Binder Phases fine powder material press WC85Co15（wt%）Ratio is same（3）Co Binder Phase fine powder materials quality 40% is accounted for made from step
Y-Ce-Sm-Nd-La-Cu-Co-Re-Ti-V nano metals additive package carry out uniformly mixing 10 minutes, the rear mesh of mistake 200
Sieve；
（5）By step（4）In mixed-powder add in agitating ball mill, abrasive media is WC-Co hard alloy ball, ratio of grinding media to material
For 5：1, using ethane as abrasive media, paraffin is added, carries out 3 agitation grindings, the agitation grinding time is 6 hours, forms slurry,
Then filtering, under conditions of 200 DEG C through atomization drying, cross 100 mesh sieves, carbide alloy mixture grain is made；
（6）Will（5）Compound made from step is suppressed using XY40 Full-automatic hydraulics powder former, pressure 25MPa, by
Green compact are made in 300MPa isostatic cool pressings；
（7）Green compact are fitted into pressure sintering furnace, dewaxing treatment is carried out under negative pressure of vacuum, 400 DEG C × 2h, after continue to vacuumize
Heating；Gas disposal is carried out under negative pressure of vacuum, 1030 DEG C × 0.5h, and continues to heat up；Consolidated under 1150 DEG C × 0.5h
Phase sintering, rear applying argon gas to -0.06MPa, and continue to heat up；Argon is filled with into body of heater when temperature reaches setting sintering temperature
Gas, and 900 DEG C are naturally cooled to after being sintered under the conditions of furnace pressure is 8MPa, 1300 DEG C × 2h, outer circulation is opened afterwards
Cooling, which improves cooldown rate, to be made to ask temperature drop to less than 100 DEG C；Finally it is heat-treated twice：It is for the first time Quenching Treatment：1000
℃×0.3h；Second is temper：300℃×5h.
Comparative example 10：
Identical raw material are pressed into WC85Co15（wt%）Ratio carries out dispensing, afterwards using the side such as traditional wet-milling, shaping, vacuum-sintering
Method prepares the superfine WC-Co cemented carbide for being not added with nano metal additive package, and the performance of itself and embodiment 10 is made
Compare, comparative result is as shown in table 10：
The comparison of the embodiment 10 of table 10. and the grain size of comparative example 10 and mechanical property
| Title | Grain size（μm） | Hardness（HRA） | Bending strength（MPa） | Fracture toughness（MPa/m2） |
| Embodiment 10 | 0.2 | 91.5 | 4800 | 13.2 |
| Comparative example 10 | 0.40 | 90.0 | 3800 | 10.5 |
Above example result explanation：Nano metal additive package toughness reinforcing superfine WC-Co cemented carbide of the present invention
The WC-Co hard alloy mechanical property for preparing of the more conventional Ultra-fine Grained alloying technology of preparation method increased, especially toughness,
This method can also be applied to the preparation of other trade mark hard alloy.
Claims (5)
1. the preparation method of a kind of nanometer of toughness reinforcing superfine WC-Co cemented carbide, its feature comprises the following steps：
（1）By particle diameter less than 5mm WC coarse powder material respectively by JZDB-100 types airflow milling in 0.7~0.8MPa operating pressures, grind
The fine powder material that particle mean size is 0.1~0.5 μm is milled under mill room oxygen content≤10ppm high-purity argon gas protection；
（2）Binder Phase Co powder is prepared using the hydraulic atomized production line of JTSWH-50 types, and high-pressure water pressure is under argon gas protection
50~80MPa, prepare the spherical fine powder material that particle mean size is 0.1~0.5 μm；
（3）The mixing of R-M nano metals is prepared using vacuum arc melting ingot casting+quick-in situ packaging plasma arc method
Powder；
（4）, will using HDQH-1 type impulse type rapids airflow mixer in argon gas protects atmosphere（1）With（2）WC made from step
Hard phase and Co Binder Phases fine powder material press WCxCoyRatio is same（3）R-M nano metals additive package is uniformly mixed made from step
Close 5~10 minutes, the rear mesh sieve of mistake 200；
（5）By step（4）In mixed-powder add in agitating ball mill, abrasive media is WC-Co hard alloy ball, ratio of grinding media to material
For 4~6：1, using ethane as abrasive media, paraffin is added, carries out 2~3 agitation grindings, the agitation grinding time is 1~6 hour,
Form slurry, then filtering, under conditions of 50~220 DEG C through atomization drying or vacuum desiccator it is dry, cross 100 mesh sieves, system
Into carbide alloy mixture grain；
（6）Will（5）Compound made from step is suppressed using XY40 Full-automatic hydraulics powder former, pressure 25MPa, by
Green compact are made in 300MPa isostatic cool pressings；
（7）Green compact are fitted into pressure sintering furnace, dewaxing treatment is carried out under negative pressure of vacuum, 350~450 DEG C × 1~2h, it is follow-up
It is continuous to vacuumize heating；Gas disposal is carried out under negative pressure of vacuum, 1000~1100 DEG C × 0.3~0.6h, and continues to heat up；
Solid-phase sintering, rear applying argon gas to -0.06MPa are carried out under 1150~1250 DEG C × 0.3~0.7h, and continue to heat up；When temperature reaches
Argon gas is filled with during to setting sintering temperature into body of heater, and is 3~10MPa, 1280~1420 DEG C × 1~2h bars in furnace pressure
900 DEG C are naturally cooled to after being sintered under part, it is rear open outer circulation cooling improve cooldown rate make to ask temperature drop to 100 DEG C with
Under；Finally it is heat-treated twice：It is for the first time Quenching Treatment：950~1050 DEG C × 0.1~0.5h；Second is at tempering
Reason：300~500 DEG C × 3~5h, as superfine WC-Co cemented carbide finished product.
2. the preparation method of according to claim 1 nanometer of toughness reinforcing superfine WC-Co cemented carbide, it is characterised in that：Institute
State WCxCoyMiddle x, y are mass percent, and x=70~99%, y=1~30%.
3. the preparation method of according to claim 1 nanometer of toughness reinforcing superfine WC-Co cemented carbide, it is characterised in that：Institute
The nano metal additive package R-M stated be R represent La, Ce, Pr, Nd, Gd, Tb, Dy, Ho, Y, Sc, Er, Lu, Sm, Tm,
Fe, Ni that a kind of in Yb, Eu, two or more elements and M are represented, Co, Al, Cu, Cr, Ta, Nb, V, Ti, Ru, Re, Zr, Zn,
Nanometer mixed powder of a kind of in Mg, two or more elements using the average grain diameter that arbitrary proportion mixes as 30 ~ 80nm.
4. the preparation method of according to claim 3 nanometer of toughness reinforcing superfine WC-Co cemented carbide, it is characterised in that：It is flat
Equal particle diameter be 30 ~ 80nm R-M nano metal mixed powders be using vacuum arc melting ingot casting+quick-in situ packaging etc. from
Prepared by daughter arc process, and the material purity for preparing nano powder is all higher than 99.9wt%.
5. the preparation method of a kind of nanometer of toughness reinforcing superfine WC-Co cemented carbide according to claim 3, its feature exist
In：Representative rare-earth element R and Fe, Ni in described nano metal mixed powder, Co, Al, Cu, Cr, Ta, Nb, V, Ti,
The percentage range that the addition of Ru, Re, Zr, Zn, Mg element accounts for Co Binder Phase fine powder material quality is respectively a=0.1~2%, b=0
~30%, c=0~30%, d=0~30%, e=0~20%, f=0~20%, g=0~5%, h=0~5%, i=0~5%, j=0~5%, k=0
~5%, l=0~20%, m=0~20%, n=0~10%, o=0~10%, p=0~10%.
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