CN106498212A - A kind of method for improving the road breaking tooth production stability of WC Co hard alloys - Google Patents
A kind of method for improving the road breaking tooth production stability of WC Co hard alloys Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 72
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000005245 sintering Methods 0.000 claims abstract description 57
- 229940125782 compound 2 Drugs 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 33
- 239000002245 particle Substances 0.000 claims abstract description 31
- 238000000498 ball milling Methods 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 26
- 229940125904 compound 1 Drugs 0.000 claims abstract description 24
- 229940126214 compound 3 Drugs 0.000 claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 claims description 43
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 40
- 238000010438 heat treatment Methods 0.000 claims description 33
- 229910009043 WC-Co Inorganic materials 0.000 claims description 29
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 28
- 238000009413 insulation Methods 0.000 claims description 25
- 238000000227 grinding Methods 0.000 claims description 18
- 238000001238 wet grinding Methods 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 6
- 238000010792 warming Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 3
- 230000008439 repair process Effects 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 4
- 238000009440 infrastructure construction Methods 0.000 abstract description 3
- 230000002860 competitive effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 14
- 235000019580 granularity Nutrition 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000002360 preparation method Methods 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
- 238000005255 carburizing Methods 0.000 description 4
- JPNWDVUTVSTKMV-UHFFFAOYSA-N cobalt tungsten Chemical compound [Co].[W] JPNWDVUTVSTKMV-UHFFFAOYSA-N 0.000 description 4
- 238000004220 aggregation Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 150000001721 carbon Chemical class 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000008246 gaseous mixture Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000004320 controlled atmosphere Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012932 thermodynamic analysis Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/052—Metallic powder characterised by the size or surface area of the particles characterised by a mixture of particles of different sizes or by the particle size distribution
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
- B22F3/101—Changing atmosphere
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
-
- 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
- C22C29/067—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 comprising a particular metallic binder
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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Abstract
The invention provides a kind of improve the road breaking tooth method of the production stability of WC Co hard alloys, by mass fraction for the Co of 6wt%～16wt% and WC powder a that granularity is 8.5～28.7 μm grind particle mean size is 4.0～6.0 μm of compound 1；By mass fraction for 6wt%～16wt% Co and WC powder b that granularity is 40～60 μm grind particle mean size is 20～30 μm of compound 2；Compound 1 and compound 2 are mixed to obtain compound 3, wherein, the WC in compound 2 accounts for the 5～50% of the WC total amounts of compound 3；Material after by dispensing is blended again, sieve, compressing, sintering is obtained described road breaking tooth WC Co hard alloys.In the present invention, by described substep ball-milling technology, coordinate again described material proportion, mix, sieve, compressing, sintering processes, contribute to the road breaking tooth hard alloy for having excellent abrasive resistance and toughness concurrently is obtained.WC Co hard alloy excellent combination properties obtained in the inventive method, product quality are stable, can be the alloy for providing super quality and competitive price in terms of the infrastructure construction fields such as pick road.
Description
Technical field
The present invention relates to a kind of preparation method of hard alloy, particularly a kind of lifting road breaking tooth WC-Co tungsten-cobalt hard
The method of the production stability of alloy.
Background technology
Hard alloy is with one or more high rigidity, refractory carbide (WC, TiC, Cr of high-moduluss2C3) it is base
Body, with a kind of heterogeneous composite material that magnesium-yttrium-transition metal (Fe, Co, Ni etc.) or other alloys are constituted as Binder Phase.This multiple
Close structural material and there is ceramic high rigidity, high-wearing feature, red hardness, and the higher-strength with metal and toughness；And it is this
Special " double high " performance target that exactly material researcher is pursued.
Tungsten-cobalt carbide is exactly " double high " hard alloy or ceramic-metallic model.Its trade mark is by YG and averagely containing cobalt
The percent composition of amount.For example, YG8, represents average WCo=8%, remaining tungsten-cobalt series hard alloy for tungsten carbide.Due to WC-
The superior performance of Co hard alloys and be widely used in wire drawing die, cutting element, corrosion-resistant part and structure member, such as high
The plunger and fluid cylinder of pressure vessel, finishing roller, the top hammer of diamond synthesis, the roll of steel wire rolling mill, paper knife etc.；Open in oil field
Bore etc..
In order to be suitable for the infrastructure construction of modernization of the country, expand the variation of product, that improves company strives power unexpectedly,
CEMENTED CARBIDE PRODUCTION factory of the country carries out, under the property condition of a large amount of exploitations, carrying out the material capability of road breaking tooth to high-ductility alloy at present
Exploitation raising is compeled in bright victory.
Continuous extension with hard alloy application. Hard alloy and material Quality Research are just towards thick and fine grain
Develop in two different directions of grain.Extra-coarse grained carbide alloy is a kind of novel hard alloy of external exploitation, has been widely used
In mining drilling tool, roll and diel field.New material and the emphasis that advanced manufacturing industry is national future development, hard
The high performance of alloy product meets realizes tungsten, the national policy of cobalt strategic resource efficient utilization.Product of the present invention belongs to metal material
Specific alloy and powder metallurgy formation technical field in material.The successful implementation of project, can preferably solve super coarse-grain hard and close
The DOMESTICATION PROBLEM of gold, fills the domestic gaps, breaks international monopoly, improve China's Cemented Carbide Enterprises high in international hard alloy
The core of end arts strives power unexpectedly, and development space is huge.
Due to being restricted by domestic tungsten carbide powder technology of preparing, domestic coarse crystal WC powder generally existing grain in process of production
Degree is uneven, crystallize imperfect, fine grained relatively many and particle size distribution width the problems such as. have the presence of moiety aggregation body, easily
Cause Fei Shi particle mean sizes big, and the partially thin illusion of actual particle size.In addition the combination tightness of aggregation differs, thus to ball
Time consuming is especially sensitive, causes production process to be difficult to control.Simultaneously because the WC particle of composition aggregation is very thin, this is burnt in alloy
Cause during knot that WC grain is uneven to grow up.So preparing super thick type mine, digging tool hard using domestic WC powder
The topmost technical problem of alloy is that hard alloy grain structure structure distribution is uneven, crystal grain distribution amplitude is wide, folder is thick to be controlled
The difficult problems such as difficulty processed.
In WC-Co hard alloy production, the main task of quality control is to make alloy obtain optimal organizational structure (i.e. two
Phase structure, not decarburization, not carburizing are requiring position with respect to magnetic saturation value；Grain size appropriateness, uniformly；Porosity is little；Cobalt distributed mutually
Uniform etc.), optimum performance.
Sintering process is the committed step for affecting hard alloy quality；Sintering be compacting product under the atmosphere of multiple gases,
It is heated to phenomenon and process that appropriate temperature occurs.Which makes compacting product that a series of sufficiently complex physics, chemistry change to occur
It is that densification and alloy microstructure are ultimately formed to change wherein topmost change.
Therefore, the carbon amounts control in H2 sintering is the most important thing, which determines the quality of product.How carbon stove in is controlled
Atmosphere, the carbon amounts for being decreased or increased all decarburizations and carburization reaction that occur in sintering process are cancelled out each other, and make final burning
Knot product have identical carbon content with original WC powder.WC in product and H2 reactions (WC+2H2 → CH4+W) is generated
Almost there is the overall process in sintering in CH4, this reaction, react and raise with temperature and aggravate.And the direction that reacts is decided by H2
Flow, H2 flows are bigger, and the CH4 for taking away is more, and CH4 concentration is less.CH4 concentration is excessive, the trip stayed in after decomposition in product
Then more from carbon, make the probability of product carburizing bigger.Carbon weakens the contact in product between powder simultaneously, and volumetric expansion is produced
Raw peeling.If this carbon is just suitable, alloy just forms bis- phase structures of WC+ γ.If this carbon is not enough, alloy then formed WC+ γ+
η three-phase structures, if this carbon is had a surplus, alloy then forms WC+ γ+C three-phase structures.Therefore, in a sense, alloy structure
Be decided by carbon number, and carbon number, affected by carbon amounts and H2 uninterrupteds, carbon amounts is uneven, the fluctuation of H2 flows, seriously
Affect stablizing for alloy structure.
However, in existing preparation method, it is difficult to maintain decarburization in road breaking tooth WC-Co hard alloy sintering process, ooze
The balance of carbon, is easily caused the unstable properties of the Hardmetal materials of preparation.
Content of the invention
The purpose of the present invention is to overcome the above-mentioned not enough of prior art and provide one kind and can lift road breaking tooth WC-Co hard
The preparation method of the steady production of alloy, improves the comprehensive use such as wearability and toughness of obtained hard alloy to reaching
While performance, the production stability of improving product is gone back.
The technical scheme is that：
A kind of improve road breaking tooth WC-Co hard alloy production stability method, by mass fraction be 6wt%～
The Co of 16wt% and granularity be 8.5～28.7 μm of WC powder a grind particle mean size is 4.0～6.0 μm of compound 1；Will
Mass fraction for 6wt%～16wt% Co and WC powder b that granularity is 40～60 μm grind particle mean size is 20～30 μm
Compound 2；Compound 1 and compound 2 are mixed to obtain compound 3, wherein, the WC in compound 2 accounts for the WC total amounts of compound 3
5～50%；Material after by dispensing is blended again, sieve, that compressing, sintering is obtained described road breaking tooth is hard with WC-Co
Matter alloy；
Sintering process is comprised the following steps：
Step (1) takes off forming agent：25～35min of insulation after 300～320 DEG C is risen to the heating rate of 2～4 DEG C/min,
Period is passed through H2 with the speed of 35～45L/min；400～500 DEG C of insulations are risen to the heating rate of 1.0～1.5 DEG C/min again
70～90min, period are passed through H2 with the speed of 55～65L/min；Subsequently 550 are risen to the heating rate of 1～3 DEG C/min again～
650 DEG C of 70～90min of insulation, period are passed through H2 with the speed of 35～45L/min；Complete defatting step；
Step (2)：Repair carbon：
After step (1), at 600～1000 DEG C 35～45L/min CH4：H2=1～2：98～99 mixed atmosphere
Under carry out carbon amounts correction；Subsequently 1000～1200 DEG C are warming up to 3.0～3.5 DEG C/min and the CH4 in 40～80L/min again:
H2=1～4: 110～130min of insulation carries out carbon amounts and precisely revises under 96～99 mixed atmosphere；
Step (3)：Vacuum and pressure sintering：After step (2) repaiies carbon, then 1200 DEG C～1380 DEG C pre-burning sections 30～
120min；Subsequently again in 1390 DEG C～1500 DEG C pressure sintering 40～100min of section, 2～3MPa of pressure sintering.
In the present invention, by described substep ball-milling technology, coordinate described material proportion again, mix, sieve, being pressed into
The unique sintering processes technique of type and the present invention, contributes to the road breaking tooth for having excellent abrasive resistance and toughness concurrently is stably obtained hard
Matter alloy.WC-Co hard alloy excellent combination property obtained in the inventive method, can be the infrastructure construction field sides such as pick road
Face provides the alloy of super quality and competitive price；Additionally, by described uniquely heating curve and the stream of cooperation and H2 and/or CH4 atmosphere
Amount control, can the de- forming agent of active balance and sintering process is de-, the process of carburizing, in effectively revising alloy because of sintering process
The bad result that de-, the carburizing for occurring causes；Lift the quality stability of product obtained in sintering.
In the present invention, using the road breaking tooth WC-Co hard alloy of described method production, through from multiple granularities
WC proportioning raw materials are blended, and are prepared after doping wet mixing through many batches of wet grinding compound, are shaped the granularity of WC and are met road breaking tooth WC-
A kind of special multi-peaks structure tungsten-cobalt hard alloys of Co, and with the low coefficient of expansion and preferable fracture toughness, thus can be full
The Special use requirement that sufficient hard alloy is used, the country for effectively overcoming domestic tungsten carbide powder technology of preparing restriction and causing
The not high defect of hard alloy workmanship, make the combination properties such as the wearability and impact flexibility of hart metal product obtained compared with
Good unification.
Preferably, preparing the particle diameter of the Co adopted by compound 1 and compound 2 for 2～2.5 μm.
Preferably, the particle diameter of described WC powder a is 14.0～18.0 μm；More preferably 16.0～18.0 μm.
Preferably, in compound 1, the percetage by weight shared by Co is 10wt%～13wt%；More preferably
12wt%～13wt%.
Under the described particle diameter of WC powder a and the content percent of Co, grinding, is obtained compound 1 in the lump.
The ball milling parameter for preparing compound 1 is：Making medium with ethanol carries out wet grinding in roller ball mill, and ratio of grinding media to material is
3: 1, liquid-solid ratio is 350mL/kg, and drum's speed of rotation is 42r/min, 12～24h of ball milling.
Under described Compounding conditions, coordinate described ball milling parameter, described compound 1 is obtained.In the present invention, as
It is preferred that, the particle diameter of compound 1 is 4.0～5.0 μm；More preferably 4.5～5.0 μm.
In the present invention, preferably, the particle diameter of described WC powder b is 40～50 μm；More preferably 50 μm.
Preferably, in compound 2, the percetage by weight shared by Co is 10wt%～13wt%.
The material of compound 2 is coordinated ball milling；Preferably, the ball milling parameter for preparing compound 2 is：Medium is made with ethanol
Wet grinding is carried out in roller ball mill, ratio of grinding media to material is 3: 1, liquid-solid ratio is 350mL/kg, drum's speed of rotation is 42r/min, ball
72～100h of mill.
Under described ball milling parameter, compound 2 is obtained；Preferably, the particle diameter of compound 2 is 20.0～30.0 μm；
More preferably 28.0～30.0 μm.
In the present invention, in the present invention, compound 1 obtained in substep ball milling and compound 2 are mixed in a ratio, are matched somebody with somebody
Material；Without the need for ball milling again.
Preferably, during by compound 1 and compound 2, the WC in compound 2 account for the WC total amounts of compound 3 20～
40%；More preferably 30～40%.
In the present invention, after 80 eye mesh screens after drying after described compound 3 is dried.
Compound 3 after sieving is placed in mould, compressing.
Preferably, compound 3 is pressed into pressed compact under 200～500MPa.Further preferably, the pressure of pressing process
For 300～350MPa.
In the present invention, the Special controlling of the atmosphere of unique sintering curre and sintering process contributes to being lifted and digs
The combination property of road tooth WC-Co hard alloy, moreover it is possible to improve the stability of product.
Preferably, in step (1)：Insulation 30min after 300 DEG C is risen to the heating rate of 3 DEG C/min, period is with 40L/
The speed of min is passed through H2；450 DEG C of insulation 80min are risen to the heating rate of 1.2 DEG C/min again, period is with the speed of 60L/min
It is passed through H2；600 DEG C of insulation 80min are risen to the heating rate of 2 DEG C/min again subsequently, period is passed through H2 with the speed of 40L/min；
Complete defatting step.
In step (2), at 600～1000 DEG C, the mixed atmosphere of carbon amounts correction is CH4: H2=1: 99.
In step (2), at 600～1000 DEG C during carbon amounts correction, under preferred CH4: H2=1: 99 atmosphere,
Preferably, CH4: H2=1: 99 flow velocity is 40L/min.
In step (2), in the accurate makeover process of carbon amounts at 1000～1200 DEG C, preferred atmosphere is CH4: H2=
1.5～2.5: 97.5～98.5.
In the present invention, in the accurate makeover process of carbon amounts, CH4∶H2=1.5～2.5: 97.5～98.5 speed that is passed through is
48～80L/min.
Preferably, in step (2), at 600～1000 DEG C under CH4: H2=1: the 99 of 40L/min mixed atmosphere
Carry out carbon amounts correction；Subsequently 1000～1200 DEG C are warming up to 3.2 DEG C/min again and in 40～80L/min CH4: H2=1.5
Under～2.5: 97.5～98.5 mixed atmosphere, insulation 120min carries out carbon amounts and precisely revises.
In the present invention, a kind of preferred sintering method is comprised the following steps：
Step (1) is placed in obtained base substrate in integral sintering stove and rises to 300 from room temperature with the heating rate of 3 DEG C/min
30min is incubated after DEG C, and period is passed through H2 with the speed of 40L/min；450 DEG C of insulations are risen to the heating rate of 1.2 DEG C/min again
80min, period are passed through H2 with the speed of 60L/min；600 DEG C of insulation 80min are risen to the heating rate of 2 DEG C/min again subsequently,
Period is passed through H2 with the speed of 40L/min；Complete defatting step；
Step (2)：Carbon is accurately repaiied：
Carbon amounts correction is being carried out under CH4: the H2 mixed atmosphere for being 1: 99 at 600～1000 DEG C, wherein, described gaseous mixture
The flow velocity of atmosphere is 40L/min；Subsequently and it is incubated to 1000～1200 DEG C with heating rate 3.3 DEG C/min ramps again
120min, is passed through the mixed gas that CH4: H2 is 1.5～2.5: 97.5～98.5, the flow velocity of described mixed gas during insulation
For 40～80L/min；The accurate correction of carbon amounts is carried out by adjusting furnace atmosphere, so as to obtain alloy normal structure；
Step (3)：Vacuum and pressure sintering：It is sintered under vacuum state in pressure sintering furnace, technological parameter is：
1200 DEG C～1380 DEG C pre-burning 30～120min of section；1390 DEG C～1500 DEG C pressure sintering 40～100min of section, pressure sintering
The pressure of journey is 2～3MPa.
In the present invention, by thermodynamic analysis reaction system, carried out with additional means intervention reaction, adjusted with realizing and
For the purpose of correction carbon content, the ratio of H2 and CH4 in H2 atmosphere, is controlled, the direction of reaction CH4 → C+2H2 can be changed, when
CH4 increases, and H2 is reduced, and reaction is carried out to the right, can make product carburetting；When H2 increases, CH4 is reduced, and reaction is carried out to the left, can make system
Product subtract carbon；Carburetting and de- broken reaction is completed by the ratio of regulation CH4 and H2, makes unnecessary tungsten inside alloy and unnecessary carbon
Carbon amounts is made to reach balance by controlling atmosphere interaction. so as to obtain alloy normal structure.In the present invention, coordinate described burning
Knot method, the sinterable product for completing are A01, B00, C00, E00 through metallographic detection and analysis.
In the present invention, a kind of method that can preferably lift the stability of road breaking tooth WC-Co hard alloy, including following
Step：
Step (a)：By from the WC powder a that granularity is 14.0～18.0 μm, the Co powder (2 of 10wt%～13wt% is added
～2.5 μm), making medium with ethanol carries out wet grinding in roller ball mill, and ratio of grinding media to material is 1: 3, and liquid-solid ratio is 350mL/kg, ball
Mill speed is 42r/min, dries after 12～24h of ball milling；The particle mean size of compound 1 is 4.0～5.0 μm；
Step (b)：From the WC powder b that granularity is 40～50 μm, Co powder (2～2.5 μ of 10wt%～13wt% are added
M), making medium with ethanol carries out wet grinding in roller ball mill, and ratio of grinding media to material is 1: 3, and liquid-solid ratio is 350mL/kg, and ball mill turns
Speed is 42r/min, dries after 72～100h of ball milling, and the particle mean size of compound 2 is 20～30 μm；
Step (c)：Compound 1 is mixed homogeneously with compound 2, the addition of obtained compound 2 is WC total amounts
30～40%；Concrete technology is as follows：Raw material is weighed according to said ratio, compound strength control is only mixing the journey of not ball milling
Degree, and final compound 3 is obtained, dried compound 3 crosses 80 eye mesh screens；
Step (d)：Compound 3 obtained by step (c) is pressed into pressed compact, pressing pressure is 300～350MPa；
Step (e)：Sintering：
Step (1) takes off forming agent：Base substrate is placed in integral sintering stove and is risen to the heating rate of 3 DEG C/min from room temperature
30min is incubated after 300 DEG C, and period is passed through H2 with the speed of 40L/min；450 DEG C of guarantors are risen to the heating rate of 1.2 DEG C/min again
Warm 80min, period are passed through H2 with the speed of 60L/min；600 DEG C of insulations are risen to the heating rate of 2 DEG C/min again subsequently
80min, period are passed through H2 with the speed of 40L/min；Complete defatting step；
Step (2)：Carbon is accurately repaiied：
Carbon amounts correction is being carried out under CH4: the H2 mixed atmosphere for being 1: 99 at 600～1000 DEG C, wherein, described gaseous mixture
The flow velocity of atmosphere is 40L/min；Subsequently and it is incubated to 1000～1200 DEG C with heating rate 3.3 DEG C/min ramps again
120min, is passed through the mixed gas that CH4: H2 is 1.5～2.5: 97.5～98.5, the flow velocity of described mixed gas during insulation
For 40～80L/min；The accurate correction of carbon amounts is carried out by adjusting furnace atmosphere, so as to obtain alloy normal structure；
Step (3)：Vacuum and pressure sintering：It is sintered under vacuum state in pressure sintering furnace, technological parameter is：
1200 DEG C～1380 DEG C pre-burning 30～120min of section；1390 DEG C～1500 DEG C pressure sintering 40～100min of section, pressure sintering
The pressure of journey is 2～3MPa.
In the present invention, by described preparation method, the WC mean grain sizes of the hard alloy of preparation reach 5.0～7.2 μ
M, bending strength reach 3080～3200MPa, hardness HRA88.0～90.1；And product metallographic detection and analysis for A01, B00,
C00、E00.
Specific embodiment
In order to be illustrated more clearly that the present invention, following examples are enumerated, but which is without any restrictions to the scope that invents.
Embodiment 1
A kind of preparation method of road breaking tooth WC-Co hard alloy, which comprises the technical steps that：By mass fraction it is
The Co (2～2.5 μm) of 10wt% and the WC powder a that granularity is 14.7 μm grind particle mean size is 4.3 μm of 1 (ball of compound
Grinding process parameter is：Making medium with ethanol carries out wet grinding in roller ball mill, and ratio of grinding media to material is 1: 3, and liquid-solid ratio is 350mL/
Kg, drum's speed of rotation are 42r/min, dry after 12～24h of ball milling)；By mass fraction for 10wt% Co (2～2.5 μm) and
Granularity be 42 μm of WC powder b grind particle mean size is that (milling parameters are for 21.5 μm of compound 2：Make to be situated between with ethanol
Matter carries out wet grinding in roller ball mill, and ratio of grinding media to material is 1: 3, and liquid-solid ratio is 350mL/kg, and drum's speed of rotation is 42r/min,
Dry after 72～100h of ball milling)；Compound 1 and compound 2 are mixed to obtain compound 3, wherein, the WC in compound 2 accounts for mixing
The 20% of the WC total amounts of material 3；Material after by dispensing is blended again, sieve, compressing (300～350MPa), base substrate is obtained
100；Subsequently it is sintered：
Sintering process is as follows：
Step (1) is placed in integral sintering stove to be risen to the heating rate of 3 DEG C/min from room temperature and be incubated after 300 DEG C
30min, period are passed through H2 with the speed of 40L/min；450 DEG C of insulation 80min, phase are risen to the heating rate of 1.2 DEG C/min again
Between H2 is passed through with the speed of 60L/min；600 DEG C of insulation 80min are risen to the heating rate of 2 DEG C/min again subsequently, period with
The speed of 40L/min is passed through H2；Complete defatting step；
Step (2) is carrying out carbon amounts correction under CH4: the H2 mixed atmosphere for being 1: 99 at 600～1000 DEG C, wherein, described
Mixed gas flow velocity be 40L/min；Subsequently 1000～1200 DEG C are warming up to and in this rank with 3.3 DEG C/min of heating rate again
Duan Baowen 120min, period are passed through the mixed gas that CH4: H2 is 1.85: 98.75, and wherein, the flow velocity of mixed gas is 48L/
min.
Step (3) vacuum and pressure sintering：It is sintered under vacuum state in pressure sintering furnace, technological parameter is：
1200 DEG C～1380 DEG C pre-burning 30～120min of section；1390 DEG C～1500 DEG C pressurization (pressure be 2～3MPa) sintering stages 40～
100min.
By the road breaking tooth WC-Co hard alloy obtained by the present embodiment, (compact dimensions are 6.5*5.25*20 μm of mark
Quasi- product) 100, sample detected, it is 3080MPa, average hard to obtain WC mean grain sizes for 5.5 μm, average bending strength
Spend for HRA89.8；Product is A01, B00, C00, E00 through metallographic detection and analysis.
Embodiment 2
A kind of preparation method of road breaking tooth WC-Co hard alloy, which comprises the technical steps that：By mass fraction it is
The Co (2～2.5 μm) of 12wt% and the WC powder a that granularity is 16.2 μm grind particle mean size is 4.6 μm of 1 (ball of compound
Grinding process parameter is：Making medium with ethanol carries out wet grinding in roller ball mill, and ratio of grinding media to material is 1: 3, and liquid-solid ratio is 350mL/
Kg, drum's speed of rotation are 42r/min, dry after 12～24h of ball milling)；By mass fraction for 12wt% Co (2～2.5 μm) and
Granularity be 50 μm of WC powder b grind particle mean size is that (milling parameters are for 28.5 μm of compound 2：Make to be situated between with ethanol
Matter carries out wet grinding in roller ball mill, and ratio of grinding media to material is 1: 3, and liquid-solid ratio is 350mL/kg, and drum's speed of rotation is 42r/min,
Dry after 72～100h of ball milling)；Compound 1 and compound 2 are mixed to obtain compound 3, wherein, the WC in compound 2 accounts for mixing
The 30% of the WC total amounts of material 3；Material after by dispensing is blended again, sieve, compressing (300～350MPa), base substrate is obtained
100；Subsequently it is sintered：
Sintering process is as follows：
Step (1) is placed in integral sintering stove to be risen to the heating rate of 3 DEG C/min from room temperature and be incubated after 300 DEG C
30min, period are passed through H2 with the speed of 40L/min；450 DEG C of insulation 80min, phase are risen to the heating rate of 1.2 DEG C/min again
Between H2 is passed through with the speed of 60L/min；600 DEG C of insulation 80min are risen to the heating rate of 2 DEG C/min again subsequently, period with
The speed of 40L/min is passed through H2；Complete defatting step；
Step (2) is carrying out carbon amounts correction under CH4: the H2 mixed atmosphere for being 1: 99 at 600～1000 DEG C, wherein, described
Mixed gas flow velocity be 40L/min；Subsequently 1000～1200 DEG C are warming up to and in this rank with 3.3 DEG C/min of heating rate again
Duan Baowen 120min, period are passed through CH4：H2 is 1.85：98.75 mixed gas, wherein, the flow velocity of mixed gas is 48L/
min.
Step (3) vacuum and pressure sintering：It is sintered under vacuum state in pressure sintering furnace, technological parameter is：
1200 DEG C～1380 DEG C pre-burning 30～120min of section；1390 DEG C～1500 DEG C pressurization (pressure be 2～3MPa) sintering stages 40～
100min.
By the road breaking tooth WC-Co hard alloy obtained by the present embodiment, (compact dimensions are 6.5*5.25*20 μm of mark
Quasi- product) 100, sample detected, it is 3100MPa, average hard to obtain WC mean grain sizes for 6.5 μm, average bending strength
Spend for HRA90.1；Product is A01, B00, C00, E00 through metallographic detection and analysis.
Embodiment 3
A kind of preparation method of road breaking tooth WC-Co hard alloy, which comprises the technical steps that：By mass fraction it is
The Co (2～2.5 μm) of 13wt% and the WC powder a that granularity is 17.2 μm grind particle mean size is 5.0 μm of 1 (ball of compound
Grinding process parameter is：Making medium with ethanol carries out wet grinding in roller ball mill, and ratio of grinding media to material is 1: 3, and liquid-solid ratio is 350mL/
Kg, drum's speed of rotation are 42r/min, dry after 12～24h of ball milling)；By mass fraction for 13wt% Co (2～2.5 μm) and
Granularity be 50 μm of WC powder b grind particle mean size is that (milling parameters are for 29.6 μm of compound 2：Make to be situated between with ethanol
Matter carries out wet grinding in roller ball mill, and ratio of grinding media to material is 1: 3, and liquid-solid ratio is 350mL/kg, and drum's speed of rotation is 42r/min,
Dry after 72～100h of ball milling)；Compound 1 and compound 2 are mixed to obtain compound 3, wherein, the WC in compound 2 accounts for mixing
The 40% of the WC total amounts of material 3；Material after by dispensing is blended again, sieve, compressing (300～350MPa), base substrate is obtained
100；Subsequently it is sintered：
Sintering process is as follows：
Step (1) is placed in integral sintering stove to be risen to the heating rate of 3 DEG C/min from room temperature and be incubated after 300 DEG C
30min, period are passed through H2 with the speed of 40L/min；450 DEG C of insulation 80min, phase are risen to the heating rate of 1.2 DEG C/min again
Between H2 is passed through with the speed of 60L/min；600 DEG C of insulation 80min are risen to the heating rate of 2 DEG C/min again subsequently, period with
The speed of 40L/min is passed through H2；Complete defatting step；
Step (2) is carrying out carbon amounts correction under CH4: the H2 mixed atmosphere for being 1: 99 at 600～1000 DEG C, wherein, described
Mixed gas flow velocity be 40L/min；1000～1200 DEG C are warming up to subsequently and at this with 3.3 DEG C/min of heating rate again
At a temperature of be incubated 120min, be passed through the mixed gas that CH4: H2 is 2.3: 97.7 during insulation, wherein, described mixed gas
Flow velocity is 80L/min；
Step (3) vacuum and pressure sintering：It is sintered under vacuum state in pressure sintering furnace, technological parameter is：
1200 DEG C～1380 DEG C pre-burning 30～120min of section；1390 DEG C～1500 DEG C pressurization (pressure be 2～3MPa) sintering stages 40～
100min.
By the road breaking tooth WC-Co hard alloy obtained by the present embodiment, (compact dimensions are 6.5*5.25*20 μm of mark
Quasi- product) 100, sample detected, it is 3200MPa, average hard to obtain WC mean grain sizes for 7.1 μm, average bending strength
Spend for HRA88.1；Product is A01, B00, C00, E00 through metallographic detection and analysis.
Comparative example 1
Compare with embodiment 1, difference is, in blending process, by described WC powder a, WC powders b and Co in the lump ball milling
Into 28.5 μm of compound；Subsequently again through sieving, compressing, sinter to obtain described product.By obtained by the present embodiment
Road breaking tooth is detected with WC-Co hard alloy (compact dimensions are 6.5*5.25*20 μm of standardized product) 100, sample；Knot
Really the combination property such as its average bending strength, average hardness, metallographic detection and analysis is worse than the embodiment of the present invention.
Claims (10)
1. a kind of improve road breaking tooth WC-Co hard alloy production stability method, it is characterised in that by mass fraction be
The Co of 6wt%～16wt% and granularity be 8.5～28.7 μm of WC powder a grind particle mean size is 4.0～6.0 μm of mixing
Material 1；By mass fraction for 6wt%～16wt% Co and WC powder b that granularity is 40～60 μm grind particle mean size is 20
～30 μm of compound 2；Compound 1 and compound 2 are mixed to obtain compound 3, wherein, the WC in compound 2 accounts for compound 3
The 5～50% of WC total amounts；Material after by dispensing is blended again, sieve, compressing, sintering is obtained described road breaking tooth and uses
WC-Co hard alloy；
Sintering process is comprised the following steps：
Step (1) takes off forming agent：25～35min of insulation, period after 300～320 DEG C are risen to the heating rate of 2～4 DEG C/min
H2 is passed through with the speed of 35～45L/min；Again with the heating rate of 1.0～1.5 DEG C/min rise to 400～500 DEG C insulation 70～
90min, period are passed through H2 with the speed of 55～65L/min；Subsequently 550～650 are risen to the heating rate of 1～3 DEG C/min again
DEG C 70～90min of insulation, period is passed through H2 with the speed of 35～45L/min；Complete defatting step；
Step (2)：Repair carbon：
After step (1), enter under CH4: H2=1～2: 98～the 99 of 35～45L/min mixed atmosphere at 600～1000 DEG C
Row carbon amounts correction；Subsequently 1000～1200 DEG C are warming up to 3.0～3.5 DEG C/min again and in 40～80L/min CH4: H2=1
Under～4: 96～99 mixed atmosphere, 110～130min of insulation carries out carbon amounts and precisely revises；
Step (3)：Vacuum and pressure sintering：After step (2) repaiies carbon, then in 1200 DEG C～1380 DEG C pre-burning 30～120min of section；
Subsequently again in 1390 DEG C～1500 DEG C pressure sintering 40～100min of section, 2～3MPa of pressure sintering.
2. the method for the production stability for improving road breaking tooth WC-Co hard alloy as claimed in claim 1, its feature exists
In the particle diameter of described WC powder a is 14.0～18.0 μm；In compound 1, percetage by weight shared by Co be 10wt%～
13wt%.
3. the method for the production stability for improving road breaking tooth WC-Co hard alloy as claimed in claim 2, its feature exists
In the particle diameter of described WC powder b is 40～50 μm；In compound 2, percetage by weight shared by Co be 10wt%～
13wt%.
4. the method for improving the production stability of road breaking tooth WC-Co hard alloy as claimed in claim 3, its feature exist
In, during by compound 1 and compound 2, the WC in compound 2 accounts for the 20～40% of the WC total amounts of compound 3.
5. the method for the production stability for improving road breaking tooth WC-Co hard alloy as claimed in claim 4, its feature exists
In preparing the particle diameter of the Co adopted by compound 1 and compound 2 for 2～2.5 μm.
6. as described in claim 1 or 5 raising road breaking tooth WC-Co hard alloy production stability method, its feature
It is, the ball milling parameter for preparing compound 1 is：Making medium with ethanol carries out wet grinding in roller ball mill, and ratio of grinding media to material is 3:
1, liquid-solid ratio is 350mL/kg, and drum's speed of rotation is 42r/min, 12～24h of ball milling；
The ball milling parameter for preparing compound 2 is：Making medium with ethanol carries out wet grinding in roller ball mill, and ratio of grinding media to material is 3: 1,
Liquid-solid ratio is 350mL/kg, and drum's speed of rotation is 42r/min, 72～100h of ball milling.
7. the method for the production stability for improving road breaking tooth WC-Co hard alloy as claimed in claim 6, its feature exists
In compound 3 is pressed into pressed compact under 200～500MPa.
8. the method for the production stability for improving road breaking tooth WC-Co hard alloy as claimed in claim 1, its feature exists
In, in step (2), at 600～1000 DEG C, the mixed atmosphere of carbon amounts correction is CH4: H2=1: 99；Wherein, CH4: H2=1:
99 flow velocity is 40L/min.
9. the method for the production stability for improving road breaking tooth WC-Co hard alloy as claimed in claim 8, its feature exists
In, in step (2), in the accurate makeover process of carbon amounts at 1000～1200 DEG C, being passed through CH4 with the speed of 48～80L/min:
H2=1.5～2.5: 97.5～98.5 mixed atmospheres.
10. the method for improving the production stability of road breaking tooth WC-Co hard alloy as claimed in claim 1, its feature exist
In comprising the following steps：
Step (a)：By the particle diameter for from the WC powder a that granularity is 14.0～18.0 μm, adding 10wt%～13wt% be 2～
2.5 μm of Co powder, making medium with ethanol carries out wet grinding in roller ball mill, and ratio of grinding media to material is 1: 3, and liquid-solid ratio is 350mL/
Kg, drum's speed of rotation are 42r/min, dry after 12～24h of ball milling；The particle mean size of compound 1 is 4.0～5.0 μm；
Step (b)：From the WC powder b that granularity is 40～50 μm, the Co that 10wt%～13wt% particle diameters are 2～2.5 μm is added
Powder, making medium with ethanol carries out wet grinding in roller ball mill, and ratio of grinding media to material is 1: 3, and liquid-solid ratio is 350mL/kg, and ball mill turns
Speed is 42r/min, dries after 72～100h of ball milling, and the particle mean size of compound 2 is 20～30 μm；
Step (c)：Compound 1 is mixed homogeneously with compound 2 and obtains compound 3, the addition of obtained compound 2 is that WC is total
The 30～40% of amount；Compound 3 is crossed 80 eye mesh screens subsequently；
Step (d)：Compound 3 obtained by step (c) is pressed into pressed compact, pressing pressure is 300～350MPa；
Step (e)：Sintering：
Step (1) takes off forming agent：Base substrate is placed in integral sintering stove from room temperature step (1)：Intensification speed with 3 DEG C/min
Rate is incubated 30min after rising to 300 DEG C, and period is passed through H2 with the speed of 40L/min；Risen to the heating rate of 1.2 DEG C/min again
450 DEG C of insulation 80min, period are passed through H2 with the speed of 60L/min；600 DEG C of guarantors are risen to the heating rate of 2 DEG C/min again subsequently
Warm 80min, period are passed through H2 with the speed of 40L/min；
Step (2)：Carbon is accurately repaiied：
Carbon amounts correction is being carried out under CH4: the H2 mixed atmosphere for being 1: 99 at 600～1000 DEG C, wherein, described mixed atmosphere
Flow velocity is 40L/min；120min to 1000～1200 DEG C and is incubated with heating rate 3.3 DEG C/min ramps again subsequently, is protected
It is passed through the mixed gas that CH4: H2 is 1.5～2.5: 97.5～98.5 during temperature, the flow velocity of described mixed gas is 40～
80L/min；
Step (3)：Vacuum and pressure sintering：It is sintered under vacuum state in pressure sintering furnace, technological parameter is：1200℃
～1380 DEG C of pre-burning 30～120min of section；1390 DEG C～1500 DEG C pressure sintering 40～100min of section, the pressure of pressure sintering process
Power is 2～3MPa.
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| CN101134242A (en) * | 2007-10-17 | 2008-03-05 | 中南大学 | Method of producing hard alloy rotatable special-shaped blade |
| CN102248165A (en) * | 2011-07-12 | 2011-11-23 | 中南大学 | Preparation method of hard alloy with clad structure |
| CN102758112A (en) * | 2012-08-10 | 2012-10-31 | 王永富 | Micron-nano WC-Co hard alloy, preparation process and application thereof |
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| CN101134242A (en) * | 2007-10-17 | 2008-03-05 | 中南大学 | Method of producing hard alloy rotatable special-shaped blade |
| CN102248165A (en) * | 2011-07-12 | 2011-11-23 | 中南大学 | Preparation method of hard alloy with clad structure |
| CN102758112A (en) * | 2012-08-10 | 2012-10-31 | 王永富 | Micron-nano WC-Co hard alloy, preparation process and application thereof |
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