CN106811653A - A kind of preparation method of monikrom cast iron base VC steel bonded carbide - Google Patents
A kind of preparation method of monikrom cast iron base VC steel bonded carbide Download PDFInfo
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Abstract
The present invention relates to a kind of preparation method of monikrom cast iron base VC steel bonded carbide, it is characterised in that by V205 powder（Vanadium）Carry out being configured to fabricated in situ VC mixed-powders for 0.4~0.5 by C/ V205 atomic ratios with graphite powder；By ferrochrome powder, molybdenum-iron powder, vanadium iron powder, nickel powder, iron powder, aquadag and the rare earths material proportions as needed for bonding phase metal chemical composition mass ratio, load steel ball ball milling, wherein adding absolute ethyl alcohol to make medium and PVA, compressing after slurry is dried after ball milling, sintering obtains steel-bonded carbide.With liquid phase sintering technology be combined in-situ reactive synthesis technology by the present invention, is prepared for monikrom cast iron base VC steel bonded carbide.Because VC is that, in intrinsic silicon fabricated in situ, enhancing particle size is tiny by the reaction in sintering process, surface combines preferable and clean interfaces without wedge angle, basal body interface.Prepared steel-bonded carbide method can improve the comprehensive mechanical property of alloy, and cheap, and technique is easy.
Description
Invention field
The present invention relates to a kind of preparation method of monikrom cast iron base VC steel bonded carbide, particularly burnt with reaction
Connection produces monikrom cast iron base VC steel bonded carbide technical fields.
Background of invention
Steel bonded carbide（Hereinafter referred to as steel-bonded carbide）It is that, with steel as matrix, tungsten carbide, titanium carbide etc. are used for hard phase
The high life mold materials between hard alloy and alloy tool steel, mould steel and high-speed steel of powder metallurgy process production
And engineering material.The ratio range of steel-bonded carbide steel matrix Binder Phase and hard phase quite it is extensive, this just determine it possess as
Lower excellent properties：1）Extensive processing performance, mainly can forgeability and machinable performance and heat-treatability and
Weldability.2）Good physical and mechanical properties, is mainly manifested in the wearability suitable with high-cobalt hart metal；Compared with steel
Rigidity high, elastic modelling quantity, bending strength and compression strength；The toughness higher compared with hard alloy；And good profit certainly
Slip and damping characteristic high etc..3）Excellent chemical stability, such as high temperature resistant, anti-oxidant, anti-various dielectric corrosions.Due to
The above-mentioned excellent combination property of steel-bonded carbide so that it is in tool die material, wear part, high temperature resistant and corrosion resistant member material
The aspects such as material more and more occupy consequence, and intermetallic composite coating, hardware electronics, automobile, machinery, metallurgy, chemical industry, ship,
It is used widely and obtains good result in the field such as Aero-Space and nuclear industry.Such as with alloy tool steel, mould steel and height
Fast steel is compared, and steel-bonded carbide can be such that die life number is increased substantially with ten times of ground, and economic benefit is also extremely notable.
In recent years, to obtain some particular tissues and performance of steel bonded carbide, and alleviate due to conventional rigid alloy
The problems such as material Main Resources W, Co are increasingly deficient, has carried out to steel bonded carbide ground with deep more extensively both at home and abroad
Study carefully, particularly to add different New Rigid phases research (such as addition A1203, TiN, NbC, TiCN, TiB2, Mo2FeB2,
Mo2C, Cr3C2, VC, NV etc.).In recent years, some new hard phase steel-bonded carbides are continued to bring out.Mitsubishi metal company
Using TiCN hardness is relatively low but the characteristics of very strong wearability, high speed comminuted steel shot is mixed with titanium carbonitride additive, shape, dewaxed,
Then the TiCN base steel-bonded carbides produced by high temperature insostatic pressing (HIP), heat treatment and method for fine finishing, with uniform microstructure, unbiased
Analysis, the characteristics of alloying level is high.Rubbing action is small between TiN and ferrite, and antisticking ability is more stronger than TiC, free energy
Smaller, oxidation resistance temperature scope is big.Sandvik AB of Sweden has developed a kind of new steel-bonded carbide based on TiN
CORONlTE.They use a kind of special process, and the TiN powder of superfine (about 0.1 micron) is equably added and can be heat-treated
Steel matrix in, its volume content can be from 35% to 60%, because TiN powder is thin and performance and its stabilization, by this method
Obtained CORONITE alloys have the wearability of hard alloy and the toughness of high-speed steel concurrently.
TiB2 has heat-resisting quantity good, and density and resistivity are small, and conductibility is good, and metal adhesiveness is low and friction factor
It is low, the features such as inoxidizability is strong, it is considered to be a kind of preferable steel-bonded carbide hard phase.Because of the solid solubility between Fe and TiB2
Low, wetability is good, and Mo can also improve its wetability, therefore the advantage of synthesis TiB2 and Fe, Mo, has made TiB.FeMo composite woods each
Material.
Japanese certain company develops and a kind of does not contain W, Co but the boride-based composite KMH of the M02FeB2 types containing Cr.
Such polynary boride-based alloy be prepared using water atomization Fe-Cr-B alloy powders, boride powder and Fe, Cr, Mo,
The metal dusts such as Ni make raw material, are manufactured through wet-milling mixing, compressing and vacuum-sintering method.
In addition to above-mentioned new steel bonded carbide, Japanese some companies also utilize a variety of hard compounds (such as
TiC, VC, Cr3C2, SiC, ZrC, AlN etc.) and its mixed compound make hard phase, make binding agent with various steel or ferrous alloy,
Develop some advanced composite material (ACM)s.
Meanwhile, people are also constantly seeking the combination of new hard phase and new Binder Phase, to develop with optimal
The MC type particulate reinforced composites of tissue and performance.In steel-bonded carbide, the hard particulate carbide species as wear-resistant phase
Compare many, there is the ceramic particles such as WC, TiC, Cr7C3, NbC, VC, SiC and alloy carbide and cementite.MC type carbide
Thermodynamic stability putting in order from high to low be：TiC ＞ NbC ＞ VC ＞ WC, putting in order for its hardness be：TiC ＞ VC
＞ WC ＞ NbC.It is known that TiC is poor with Fe intermiscibilities.Sintering temperature is high, and strength ratio WC is poor, and its advantage is light weight, thermally-stabilised
Property, frictional property are good；WC high temperature is bad with Fe intermiscibilities, is easily dissolved in Fe during high temperature, and high high-temp stability, calorific intensity are poor,
Separated out in cooling procedure so as to form bridge joint, deteriorate the mechanical performance of alloy；As carbide V element, with
Ti elements are similar to, and V is also a kind of very active alloying element, first with C, N etc. to have very strong affinity.The parent of V element and C
With power more than Cr elements and the affinity of C, two kinds of stable carbides of VC and V2C are easily formed.In carbide ceramics, VC's is hard
Degree highest, and have good heat endurance, it is a kind of preferable hard enhancing phase.
VC extremely stablizes, and is generally distributed in alloy substrate with tiny graininess, one side crystal grain thinning, improves matrix
The intensity and wearability of alloy；On the other hand, the creep rupture strength and the drag to creep of matrix are increased.The microhardness of VC
It is very high, more than 2800MPa is reached, it is a kind of wear-resistant phase of preferable alloy carbide.Take VC as the Novel steel knot hard for strengthening phase
Alloy, VC and Fe has extraordinary intermiscibility, and the two joint interface is good, and high high-temp stability, red hardness are good, is TiC, WC
Reinforcement is substituted well.Also between TiC and WC, vanadium can shape in Hi-Stren steel for the fusing point and thermal coefficient of expansion of VC
Precipitated into tiny vanadium carbide and effectively facilitate the crystal grain refinement of steel and strengthen；Vanadium carbide mutually can pinning dislocation and crystal boundary, obstruction position
Wrong and crystal boundary migration, improves the intensity of steel；The presence of vanadium carbide phase simultaneously can also improve the recrystallization temperature of material and high temperatures
Energy.Existing research shows：Vanadium carbide is added in steel can also improve wearability, corrosion resistance, toughness, ductility and the hardness of steel
And the comprehensive mechanical performance such as thermal fatigue resistance, and make steel that there is good solderability, and play elimination field trash and extend etc. and make
With.Therefore, vanadium carbide is used widely in steel.
Meanwhile, this novel hard alloy it is alternative traditional in industries such as automobile, metallurgy, mine, building materials and moulds
High-abrasive material, increases substantially parts service life, economizes on resources, with good economic results in society.Additionally, with work
The wilderness demand of industry production and inevitably artificial waste, China or even worldwide W, Co resource are quite poor
Weary, price rises steadily, and each national capital Efforts To Develop seeks the research and development of the substitute material of W, Co.And China V ore resources are abundant,
Replace W with V has feasibility very high in resource.Therefore, VC bases steel bonded carbide either engineer applied is researched and developed
Aspect, or be all significant in terms of Technological Economy.
The obdurability of the alloy manufactured by steel bonded carbide manufacturing process developed at present is still relatively low, far from satisfaction
More and more power of withstanding shocks are larger, the use in the case of impact velocity is higher.Therefore Development and Production high-performance, low cost
Steel bonded carbide is necessary.Wherein, the obdurability for improving steel-bonded carbide is the research direction of emphasis.
At present, the method mainly powder metallurgy lqiuid phase sintering method of steel bonded carbide is prepared.Lqiuid phase sintering method can be with root
The appropriate Binder Phase of selection and can be in the interior content for adjusting hard phase in a big way, but due to powder metallurgy is needed according to practical application
The hard phase of lqiuid phase sintering method is generally introduced in the way of adding, and the cost of raw material is high, particle is thick, hard phase titanium carbide and bonding
Bad, interface vulnerable to pollution of wetability of phase etc., therefore there is porosity by steel bonded carbide prepared by lqiuid phase sintering method
The shortcomings of height, low performance, high cost, for requiring that application scenario higher is often needed by forging or hip treatment, material
The cost performance of material is further reduced.
In recent years, the research that steel bonded carbide is prepared using in-situ synthesis has been carried out both at home and abroad.Situ synthesis techniques
Be it is a kind of designed by alloy, under certain condition in parent metal reaction in-situ to generate one or more thermodynamically stable
The advanced composite material (ACM) technology of preparing of hard phase.Compared with traditional material preparation method, the technology have preparation process is simple,
The enhancing of produced in situ is not mutually contaminated, is becoming for steel bonded carbide technology of preparing development the features such as interface bond strength is high
Gesture.
But in-situ synthesis also have many deficiencies:Enhancing particle is only limited to the thermodynamically stable grain in particular substrate；
Generation compared to more complicated, whard to control；Granular size, shape receive forming core, the dynamics Controlling of growth process, and in-situ particle
After formation, often meeting segregation asks gap or grain boundary in dendrite in casting process, and bad shadow is produced to material structure and performance
Ring, and manufacturability is poor, and preparation cost is higher than existing process, is unsuitable for large-scale production.Obviously, situ synthesis techniques are realized producing
The key of industry is must further to study rational homogenization process, optimum synthesis technique, reduction production cost.
The content of the invention
In view of the shortcomings of the prior art, the invention provides a kind of system of monikrom cast iron base VC steel bonded carbide
Preparation Method, is used to improve the performance of monikrom cast iron base VC steel bonded carbide.
A kind of preparation method of monikrom cast iron base VC steel bonded carbide of the invention, it uses following technical side
Case：
(1) raw material：
Raw materials be V205 powder, ferrochrome powder, molybdenum-iron powder, vanadium iron powder, nickel powder, iron powder, ferrosilicon powder, ferromanganese powder, aquadag,
CeO2、Y3O2、La2O3One of them or three kinds, PVA, powder size is at 10~50 μm；
(2) material is prepared：
1）Fabricated in situ VC mixed-powders are prepared：By V205 powder（Vanadium）With aquadag powder press C/ V205 atomic ratios for 0.4~
0.5 carries out being configured to fabricated in situ VC mixed-powders；
2）Bonding phase matrix alloy powder is prepared：Bonding phase metal material chemical composition mass percent is：C2.9~3.7%,
Cr1.3~2.5%, Mo0.2~0.6%, Ni0.5~2.0%, V0.2~0.6%, Si1.2~2.0%, Mn0.4~1.2%, S≤
0.02%, P≤0.02%, CeO2、Y3O2、La2O3Combination≤0.8% of one of them or more than two kinds, balance of Fe and can not keep away
The impurity element exempted from；
3）Monikrom cast iron base VC Steel-bonded Cemented Carbides are prepared：Material chemical composition mass percent is：Close original position
Into VC mixed-powders 30~50%, bonding phase matrix alloy powder 70~50%；
(3) step of preparation process is：
1）Material is prepared：By V205 powder（Vanadium）Carry out being configured to original for 0.4~0.5 by C/ V205 atomic ratios with aquadag powder
Position synthesis VC mixed-powders；By ferrochrome powder, molybdenum-iron powder, nickel powder, vanadium iron powder, ferrosilicon powder, ferromanganese powder, according to required chemical composition
Mass percent converts, together with iron powder, aquadag, CeO2、Y3O2、La2O3The combination raw materials of one of them or more than two kinds are pressed
Proportions needed for bonding phase metal material chemical composition mass percent；
2）The ratio of VC particles and matrix material according to needed for Steel-bonded Cemented Carbide is mixed two kinds of materials, is loaded
In ball milling bucket, load steel ball, ratio of grinding media to material 5:1~10:1, add absolute ethyl alcohol make medium and 0.5-1%PVA as cooling agent and
Dispersant, using vibrations ball mill ball milling 48~72 hours；
3）Sieved after slurry is dried, the product of required size shape is then pressed under 350~500 MPa pressure；
4）Sinter under vacuum, sintering temperature is 1400 DEG C~1500 DEG C, sintering process is:10 DEG C/min of firing rate,
The Isothermal sinter of 2~5 hours is carried out after arrival sintering temperature, furnace cooling to room temperature obtains the chromium nickel-molybdenum alloy of required composition
Cast iron base VC steel bonded carbide.
Beneficial effect
Compared with prior art, the invention has the advantages that：
1st, the present invention is with cheap V205 powder, iron powder, ferrochrome powder, molybdenum-iron powder, ferrotungsten powder, vanadium iron powder, ferrosilicon powder, ferromanganese
Powder, aquadag is raw material, and in-situ reactive synthesis technology is combined with liquid phase sintering technology, is prepared for hard phase vanadium carbide body
Fraction is 30%~50% high tough VC high-speed steel-bases steel bonded carbide.It is mainly characterized by：1. because steel knot hard is closed
VC in gold is in intrinsic silicon fabricated in situ by the reaction in sintering process, it is possible to obtain Ordinary hardening phase powder
The method of mixing is difficult to reach, or even inaccessiable granular and uniformity coefficient, and basal body interface is combined preferably and interface is dry
Only.2. fabricated in situ enhancing particle size is tiny, and surface is evenly distributed in the base without wedge angle, so as to improve material
Bending strength and properties.3. situ synthesis techniques are combined together with liquid phase sintering technology, technique is easy, low cost.
4. it is cheap due to raw material, cost can be substantially reduced.Can not only be burnt in a vacuum in the technique of this powder simultaneously
Knot, it is also possible to how to sinter in the atmosphere such as hydrogen, widened the means approach manufactured.
The present invention improves the activity of powder using high-energy ball milling mode, and reaches titanium carbide with the machinery conjunction of steel matrix powder
The degree of aurification, so as to improve titanium carbide and compatibility of the steel matrix in sintering process, improves the obdurability of final alloy.This
Outward, the present invention in employ the relatively low ferro-molybdenum of price as raw material, its in sintering process further improve titanium carbide with
The wetability of steel matrix, improves the obdurability of alloy.Therefore, the present invention prepares high-performance steel-bonded carbide method and can improve alloy
Comprehensive mechanical property, and process is easy, cost-effective.
2nd, the present invention mutually manufactures new steel bonded carbide by enhancing of VC, and VC and Fe has extraordinary intermiscibility, two
Person's joint interface is good, and high high-temp stability, red hardness are good, in carbide ceramics, the hardness highest of VC, and have well
Heat endurance, is a kind of preferable hard enhancing phase, is that TiC, WC substitute reinforcement well.Vanadium carbide mutually can pinning dislocation with
Crystal boundary, hinders dislocation and crystal boundary migration, improves the intensity of steel；The presence of vanadium carbide phase simultaneously can also improve the recrystallization temperature of material
Degree and high-temperature behavior.Doing hard phase using vanadium carbide can also improve wearability, corrosion resistance, toughness, ductility and the hardness of steel
And the comprehensive mechanical performance such as thermal fatigue resistance, and make steel that there is good solderability, and play elimination field trash and extend etc. and make
With.Can be widely applied to the adverse circumstances of heavy duty, high speed, dry sliding friction or high temperature and high speed friction.
3rd, the present invention is by adding CeO2、Y3O2、La2O3Growing up for crystal grain is inhibited, and plays a part of dispersion-strengtherning.By
In CeO2、Y3O2、La2O3Chemical property is active, at a sintering temperature, CeO2、Y3O2、La2O3Can with metal dust interface on
Impurity and oxide-film are acted on, and play a part of to purify interface, contribute to the improvement of wetability, so as to be conducive to entering for densification
Journey, reaches the purpose for reducing porosity, and the reduction of porosity will contribute to the raising of bending strength.CeO2、Y3O2、
La2O3Powder content can play rare earth reinforced and act between 0. 2% and 0. 5%, therefore steel bonded carbide of the invention
Intensity and consistency are improved, and bending strength can reach more than 1700MPa, and consistency reaches 97. more than 4%.
3rd, the present invention improves the activity of powder using high-energy ball milling mode, and reaches vanadium carbide and steel matrix powder mechanical alloy
The degree of change, so as to improve vanadium carbide and compatibility of the steel matrix in sintering process, improves the obdurability of final alloy.This
Outward, the relatively low ferroalloy of price is employed as raw material, and after adding a certain amount of molybdenum in the present invention, it is sintered
Further improve the wetability of vanadium carbide and steel matrix in journey, the hard that steel bonded carbide situ is synthesized can be suppressed
Phase VC grows up, and reduces VC particle sizes, is evenly distributed.Wetting of the Binder Phase to hard phase VC is improved after due to adding molybdenum
Property, be conducive to liquid phase in sintering process to the filling of hole, porosity is low, is improved the density of steel bonded carbide,
Crystal grain is tiny, even tissue, so that its hardness and bending strength and obdurability are also improved.Therefore, prepared by the present invention
High-performance steel-bonded carbide method can improve the comprehensive mechanical property of alloy, and process is easy, the easy to operate, sintering period
It is short, process costs are low, be suitable to industrialized production.
Specific embodiment
Technical scheme is further illustrated with reference to specific embodiment：
Embodiment 1
A kind of preparation method of monikrom cast iron base VC steel bonded carbide, it uses following technical scheme：
(1) raw material：
Raw materials be V205 powder, ferrochrome powder, molybdenum-iron powder, nickel powder, vanadium iron powder, ferrosilicon powder, ferromanganese powder, iron powder, aquadag,
CeO2, PVA, powder size is below 10~50 μm；
(2) material is prepared：
1）Fabricated in situ VC mixed-powders are prepared：By V205 powder（Vanadium）Carried out for 0.4 by C/ V205 atomic ratios with aquadag powder
It is configured to fabricated in situ VC mixed-powders；
2）Bonding phase matrix alloy powder is prepared：Bonding phase metal material chemical composition mass percent is：C3.0%, Cr1.3%,
Mo0.2%, Ni0.5%, V0.2%, Si1.20%, Mn0.4%, S≤0.02%, P≤0.02%, CeO2、Y3O2、La2O3One of them or
More than two kinds of combination≤0.8%, balance of Fe and inevitable impurity element；
3）Monikrom cast iron base VC Steel-bonded Cemented Carbides are prepared：Material chemical composition mass percent is：Close original position
Into VC mixed-powders 30%, bonding phase matrix alloy powder 70%；
(3) step of preparation process is：
1）Material is prepared：By V205 powder（Vanadium）Carry out being configured to fabricated in situ for 0.4 by C/ V205 atomic ratios with aquadag powder
30%VC mixed-powders；By ferrochrome powder, molybdenum-iron powder, ferrotungsten powder, vanadium iron powder, ferrosilicon powder, ferromanganese powder, according to required chemical composition
Mass percent converts, together with iron powder, aquadag, CeO2Raw material presses bonding phase metal material chemical composition mass percent
70% proportions；
2）Two kinds of materials of the fabricated in situ 30%VC particles needed for Steel-bonded Cemented Carbide and matrix material 70% are mixed
Close, be fitted into ball milling bucket, load steel ball, ratio of grinding media to material 5:1, add absolute ethyl alcohol to make medium and 0.6%PVA as cooling agent and divide
Powder, using vibrations ball mill ball milling 55 hours；
3）Sieved after slurry is dried, the product of required size shape is then pressed under 400 MPa pressure；
4）Sinter under vacuum, sintering temperature is 1400 DEG C, sintering process is:10 DEG C/min of firing rate, reaches sintering
The heat preservation sintering of 2.5 hours is carried out after temperature, furnace cooling to room temperature obtains the monikrom cast iron base VC steel of required composition
Bond hard alloy.
Embodiment 2
A kind of preparation method of monikrom cast iron base VC steel bonded carbide, it uses following technical scheme：
(1) raw material：
Raw materials are V205 powder, ferrochrome powder, molybdenum-iron powder, nickel powder, vanadium iron powder, ferrosilicon powder, ferromanganese powder, iron powder, nickel powder, colloid
Graphite, CeO2、Y3O2Two kinds, PVA, powder size is below 10~50 μm；
(2) material is prepared：
1）Fabricated in situ VC mixed-powders are prepared：By V205 powder（Vanadium）Enter for 0.40 by C/ V205 atomic ratios with aquadag powder
Row is configured to fabricated in situ VC mixed-powders；
2）Bonding phase matrix alloy powder is prepared：Bonding phase metal material chemical composition mass percent is：C3.2%, Cr1.9%,
Mo0.4%, Ni1.5%, V0.4%, Si1.6%, Mn0.8%, S≤0.02%, P≤0.02%, CeO2、Y3O2、La2O3One of them or two
Plant combination≤0.8%, balance of Fe and the inevitable impurity element of the above；
3）Monikrom cast iron base VC Steel-bonded Cemented Carbides are prepared：Material chemical composition mass percent is：Close original position
Into 40%TiC mixed-powders, bonding phase matrix alloy powder 60%；
(3) step of preparation process is：
1）Material is prepared：By V205 powder（Vanadium）Carry out being configured to conjunction in situ for 0.45 by C/ V205 atomic ratios with aquadag powder
Into 40%VC mixed-powders；By ferrochrome powder, molybdenum-iron powder, ferrotungsten powder, vanadium iron powder, ferrosilicon powder, ferromanganese powder, according to required chemistry into
Divide mass percent conversion, together with iron powder, aquadag, CeO2Raw material presses bonding phase metal material chemical composition mass percent
60% proportions；
2）By the 40%VC particles of fabricated in situ needed for Steel-bonded Cemented Carbide and two kinds of materials of the ratio of matrix material 60%
Mixed, be fitted into ball milling bucket, loaded steel ball, ratio of grinding media to material 7:1, add absolute ethyl alcohol to make medium and 0.8%PVA as cooling
Agent and dispersant, using vibrations ball mill ball milling 62 hours；
3）Sieved after slurry is dried, the product of required size shape is then pressed under 450 MPa pressure；
4）Sinter under vacuum, sintering temperature is 1450 DEG C, sintering process is:10 DEG C/min of firing rate, reaches sintering
The heat preservation sintering of 3.5 hours is carried out after temperature, furnace cooling to room temperature obtains the monikrom cast iron base VC steel of required composition
Bond hard alloy.
Embodiment 3
A kind of preparation method of monikrom cast iron base VC steel bonded carbide, it uses following technical scheme：
(1) raw material：
Raw materials be V205 powder, ferrochrome powder, molybdenum-iron powder, nickel powder, vanadium iron powder, ferrosilicon powder, ferromanganese powder, iron powder, aquadag,
CeO2、Y3O2、La2O3, PVA, powder size is below 10~50 μm；
(2) material is prepared：
1）Fabricated in situ VC mixed-powders are prepared：By V205 powder（Vanadium）Carried out for 0.5 by C/ V205 atomic ratios with aquadag powder
It is configured to fabricated in situ VC mixed-powders；
2）Bonding phase matrix alloy powder is prepared：Bonding phase metal material chemical composition mass percent is：
C3.5%, Cr2.5%, Mo0.6%, Ni2.0%, V0.6%, Si2.0%, Mn1.2%, S≤0.02%, P≤0.02%, CeO2、
Y3O2、La2O3Combination≤0.8% of one of them or more than two kinds, balance of Fe and inevitable impurity element；
3）Monikrom cast iron base VC Steel-bonded Cemented Carbides are prepared：Material chemical composition mass percent is：Close original position
Into VC mixed-powders 50%, bonding phase matrix alloy powder 50%；
(3) step of preparation process is：
1）By V205 powder（Vanadium）Be configured to fabricated in situ 50%VC and mixed for 0.5 by C/ V205 atomic ratios with aquadag powder
Powder；Ferrochrome powder, molybdenum-iron powder, nickel powder, vanadium iron powder, ferrosilicon powder, ferromanganese powder are changed according to required chemical composition mass percent
Calculate, together with iron powder, aquadag, CeO2Raw material presses the proportions of bonding phase metal material chemical composition mass percent 50%；
2）By the 50%VC particles of fabricated in situ needed for Steel-bonded Cemented Carbide and two kinds of materials of the ratio of matrix material 50%
Mixed, be fitted into ball milling bucket, loaded steel ball, ratio of grinding media to material 10:1, add absolute ethyl alcohol to make medium and 1%PVA as cooling agent
And dispersant, using vibrations ball mill ball milling 72 hours；
3）Sieved after slurry is dried, the product of required size shape is then pressed under 500 MPa pressure；
4）Sinter under vacuum, sintering temperature is 1480 DEG C, sintering process is:10 DEG C/min of firing rate, reaches sintering
The heat preservation sintering of 4.5 hours is carried out after temperature, furnace cooling to room temperature obtains the monikrom cast iron base VC steel of required composition
Bond hard alloy.
Claims (2)
1. a kind of preparation method of monikrom cast iron base VC steel bonded carbide, it is characterised in that including as follows：
(1) material is prepared：
1）Fabricated in situ VC mixed-powders are prepared：By V205 powder（Vanadium）With aquadag powder press C/ V205 atomic ratios for 0.4~
0.5 carries out being configured to fabricated in situ VC mixed-powders；
2）Bonding phase matrix alloy powder is prepared：Being bonded phase basic asphalt mixture Ingredient percent is：C2.9~3.7%,
Cr1.3~2.5%, Mo0.2~0.6%, Ni0.5~2.0%, V0.2~0.6%, Si1.2~2.0%, Mn0.4~1.2%, S≤
0.02%, P≤0.02%, CeO2、Y3O2、La2O3Combination≤0.8% of one of them or more than two kinds, balance of Fe and can not keep away
The impurity element exempted from；
3）Monikrom cast iron base VC Steel-bonded Cemented Carbides are prepared：Material chemical composition mass percent is：Close original position
Into VC mixed-powders 30~50%, bonding phase matrix alloy powder 70~50%；
(2) step of preparation process is：
1）Material is prepared：By V205 powder（Vanadium）Institute is configured to for 0.4~0.5 by C/ V205 atomic ratios with aquadag powder
Need the fabricated in situ VC mixed-powders of ratio；By ferrochrome powder, molybdenum-iron powder, nickel powder, vanadium iron powder, ferrosilicon powder, ferromanganese powder, according to required
Chemical composition mass percent conversion, together with iron powder, aquadag, CeO2、Y3O2、La2O3One of them or more than two kinds
Combination raw materials proportions as needed for bonding phase matrix alloy powder chemistry Ingredient percent；
2）The ratio of fabricated in situ VC mixed-powders and bonding phase matrix alloy powder according to needed for Steel-bonded Cemented Carbide
Two kinds of materials are mixed, is fitted into ball milling bucket, loaded steel ball, ratio of grinding media to material 5:1~10:1, add absolute ethyl alcohol make medium and
0.5~1%PVA as cooling agent and dispersant, using vibrations ball mill ball milling 48~72 hours；
3）Sieved after slurry is dried, the product of required size shape is then pressed under 350~500 MPa pressure；
4）Sinter under vacuum, sintering temperature is 1400 DEG C~1500 DEG C, sintering process is:10 DEG C/min of firing rate,
The Isothermal sinter of 2~5 hours is carried out after arrival sintering temperature, furnace cooling to room temperature, the high tough VC for obtaining required composition is high
Fast base steel steel bonded carbide.
2. a kind of preparation method of monikrom cast iron base VC steel bonded carbide according to claim 1, its feature
It is：Raw materials are V205 powder, ferrochrome powder, molybdenum-iron powder, vanadium iron powder, nickel powder, iron powder, ferrosilicon powder, ferromanganese powder, colloid stone
Ink, CeO2、Y3O2、La2O3One of them or three kinds, PVA, powder size is at 10~50 μm.
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