CN109852870A - A kind of preparation method of nitrogenous steel bonded carbide - Google Patents
A kind of preparation method of nitrogenous steel bonded carbide Download PDFInfo
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Abstract
A kind of preparation method of nitrogenous steel bonded carbide, using comminuted steel shot as Binder Phase, makes nitrogenous steel bonded carbide by powder metallurgy production method using the nitrogen carbide powder of titanium as hard phase.First the nitrogen carbide powder of titanium is handled before production, then the nitrogen carbide powder of titanium is mixed with comminuted steel shot, and together in-situ sintering at nitrogenous steel bonded carbide.The nitrogen carbide powder to titanium carries out ratio when processing refers to the nitrogen carbide powder of production titanium by adjusting carbon black and titanium dioxide, and the flow for controlling sintering temperature and nitrogen produces the nitrogen carbide of 0.15% or less free carbon, the titanium below of oxygen content 0.6%.And when making nitrogenous steel bonded carbide, first by comminuted steel shot solutionizing, the free carbon in comminuted steel shot is sufficiently reduced.The present invention is capable of forming that hard phase is finer and close in conjunction with Binder Phase, and the nitrogenous steel bonded carbide with higher microhardness, lubricity and wearability.
Description
Technical field
The present invention relates to a kind of production methods of steel bonded carbide, and in particular to a kind of nitrogen carbide production using titanium
The production method of nitrogenous steel bonded carbide.This kind can be obtained firmly using the nitrogenous steel bonded carbide that the nitrogen carbide of titanium makes
Matter phase is finer and close in conjunction with Binder Phase, the steel bonded carbide with higher microhardness, lubricity and wearability.Belong to hard
Matter alloy manufacture technology field.
Background technique
As the whole world is continuously increased being dropped in for infrastructure construction, thus, also drive steel, cement, sandstone etc.
The demand of construction material constantly rises.Since steel bonded carbide (hereinafter referred to as steel-bonded carbide) is production steel and wire rod guide wheel
Constantly deepen with the understanding of the excellent material of grinder hammerhead, especially people to steel-bonded carbide, market combined steel in recent years
The demand of gold increases in blowout.
Steel-bonded carbide is mainly using chromium steel or manganese steel as Binder Phase, using titanium carbide or tungsten carbide as hard phase, using powder
Metallurgical method produces a kind of abrasion resistance material prepared.Since tungsten belongs to materials in short supply, price and density is very big, because
This, is rarely employed in practice, and it is hard phase that steel-bonded carbide in the market, which is generally used titanium carbide,.
About Binder Phase: since titanium carbide has the free carbon (generally in 0.2%-0.6%) of suitable content, if directly
Make Binder Phase using comminuted steel shot, the free carbon in titanium carbide will change the property of steel.Along with the ingredient fixation of comminuted steel shot is not easy to adjust
Whole and price is more expensive, therefore, general in actual production not use comminuted steel shot directly, but by iron powder, molybdenum powder, nickel powder, ferromanganese powder, chromium
The fabricated in situ steel-bonded carbide together with carbonized titanium powder such as iron powder, vanadium iron powder, carbon black, and existing production steel-bonded carbide technique is all
Directly titanium carbide and iron powder, nickel powder, ferromanganese powder, ferrochrome powder, molybdenum powder, carbon black etc. are mixed together, using mixing glue compression moulding
After be put into sintering furnace and sinter steel bonded carbide into situ.
About hard phase: titanium carbide has higher microhardness, and density is low and cheap, is that steel-bonded carbide is more satisfactory
Hard phase material.However, it is known that TiCN has higher microhardness, lubricity and wearability, also, more
It can be moistened by the base steel as Binder Phase；But people do not select TiCN to do one of hard phase material of steel-bonded carbide
Most important reason is precisely due to nitrogen makes alloy form big hole in alloy manufacturing process there are sizable " fugacity "
Porosity or hole, thus, it will be greatly reduced the service performance of alloy.Therefore, who, which can solve, does steel-bonded carbide using TiCN
Without generating big this stubborn problem of gap, who can stand in the commanding elevation for capturing steel-bonded carbide quality.
By retrieval, patent literature report same as the present invention is not found, only retrieves some relevant patent texts
It offers, mainly there is following patent:
1, Patent No. CN201710074648, a kind of entitled " preparation method of TiC matrix base steel steel bonded carbide ", Shen
It asks someone are as follows: the patent of invention of Danyang Huida Mold Material Technology Co., Ltd., which disclose a kind of TiC matrix base steel steel knots
The preparation method of hard alloy includes the following steps: proportionally to weigh carbonized titanium powder and matrix steel matrix powder, alloyed powder is put
Enter and mixed and be crushed in ball mill, wherein addition dehydrated alcohol is process control agent, is put into wet mixed powder very after ball milling
It is dried in empty drying box, it is spare after dry.Organic monomer and initiator are added in solvent and prepare premixed liquid；Addition mentions
The additive of high slurry fluidity and dispersibility；Catalyst and pH adjusting agent is added and stirs evenly, obtains slurry；Slurry is infused
Enter to infuse solidifying mould and vacuumize or shake degasification, green body is put into vacuum oven after slurry curing molding and is dried, will be dried
Green body afterwards carries out integrated degumming and sintering in vacuum sintering furnace, prepares steel bonded carbide.
2, Patent No. CN201711296675, entitled " a kind of Steel-bonded Cemented Carbide and preparation method thereof ", Shen
Ask someone are as follows: the patent of invention of Xiang precision stamping Co., Ltd is converged in Yangzhou, which disclose a kind of Steel-bonded Cemented Carbide and
Preparation method；Its ingredient includes: titanium carbide, stearic acid, iron, manganese, vanadium 0.25, chromium, molybdenum, zirconium, nickel and aluminium；The present invention by molybdenum,
Chromium, vanadium and titanium carbide are compressed to green body after evenly mixing, and mix with stearic acid as filler, and base in-vivo metal melts after sintering
It is combined together, and green body internal formation capillary channel after stearic acid evaporation, enters the molten liquid of manganese, al and ni in infiltration
Green body, wherein manganese and vanadium use that match can use vanadium and make up the shortcomings that manganese promotion crystal grain is grown up, to preferably embody
The high rigidity and high intensity of alloy, chromium, zirconium and aluminium are used in combination the antioxygenic property that can significantly improve alloy and anticorrosive
Performance improves the service life of alloy, moreover it is possible to which the transverse impact toughness for improving alloy improves the durability degree of mold.
3, Patent No. CN201110164167, it is entitled " preparation method of titanium carbide base Steel-bonded Cemented Carbide ",
Applicant are as follows: the patent of invention of Wuxi Xin Qun new material Science and Technology Ltd., which disclose a kind of titanium carbide base steel knot is hard
Matter alloy material, the material is using hard alloy titanium carbide as hard base, using alloy tool steel as Binder Phase, the carbonization
The mass percent of titanium is 35%-45%, and the mass percent of the alloy tool steel is 55%-65%, the titanium carbide and alloy
The quality summation of tool steel is 100%, and the alloy tool steel is made of chromium, molybdenum, aluminium, nickel, titanium and iron, wherein the quality hundred of chromium
Divide than being 3.1%-18%, the mass percent of molybdenum is 0.5%-4.5%, and the mass percent of aluminium is 0.6%-1%, the quality percentage of nickel
Than being 0.5%-1% for the mass percent of 0.6%-11%, titanium, surplus is iron and carbon, and each composition obtains mass percent summation and is
100。
By carefully analyzing to these above-mentioned patents, although these patents are directed to steel bonded carbide and its production side
Method, it was also proposed that some improved technology schemes, but by carefully analyzing, these steel bonded carbide proposed are still all existing
Some is made steel bonded carbide of titanium carbide, is only improved on the formula of material or in technique, is not mentioned
Out using the method for nitrogenous hard alloy production steel bonded carbide, problem noted earlier in this way still remained, still need into
One step is subject to Improvement.
Summary of the invention
The purpose of the present invention is: how to solve to do using the nitrogen carbide of titanium steel-bonded carbide without generate big gap this
Stubborn problem, the production method for proposing a kind of nitrogenous steel bonded carbide, this kind of nitrogenous steel bonded carbide production method system
Contain sufficient nitrogen in the steel bonded carbide made, being formed by steel bonded carbide is nitrogenous steel bonded carbide.
For with the above problem, technical solution proposed by the present invention is: a kind of preparation method of nitrogenous steel bonded carbide,
Using the nitrogen carbide powder of titanium as hard phase, using comminuted steel shot as Binder Phase, made by powder metallurgy production method nitrogenous
Steel bonded carbide；First the nitrogen carbide powder of titanium is handled before production, then the nitrogen carbide powder of titanium is mixed with comminuted steel shot
Be combined, and together in-situ sintering at nitrogenous steel bonded carbide.
Further, the nitrogen carbide powder to titanium pass through when processing refers to the nitrogen carbide powder of production titanium
The ratio of carbon black and titanium dioxide is adjusted, and the flow for controlling sintering temperature and nitrogen produces free carbon lower than 0.15% or less, oxygen
Content is lower than the nitrogen carbide of 0.6% titanium below.
Further, the nitrogen carbide of the titanium include TiCN, titanium nitride and titanium carbide mixture or titanium nitride and
The mixture of TiCN and any weight percent of titanium carbide.
Further, described is to use to pass through pretreated comminuted steel shot as Binder Phase using comminuted steel shot as Binder Phase；Described
Pretreated comminuted steel shot is sufficiently to reduce the free carbon in comminuted steel shot first by comminuted steel shot solutionizing.
It is further, described that sinter steel bonded carbide by fabricated in situ be to make nitrogenous hard alloy steel knot hard
When matter alloy, the nitrogen carbide of titanium is mixed with comminuted steel shot, nitrogen charging sintering is taken to make nitrogenous steel bonded carbide.
Further, it is nitrogen carbide and steel according to titanium that the nitrogen carbide powder by titanium and comminuted steel shot, which mix,
The weight proportion of powder is the nitrogen carbide of titanium between 30%-70%, ratio progress wet-milling mixing of the comminuted steel shot between 28%-68%.
Further, being added when the nitrogen carbide of titanium is mixed with comminuted steel shot has niobium powder, gives fixed nitrogen by the addition of niobium powder.
Further, the specific dosage of the niobium powder is determined according to the actual free carbon content of nitrogen carbide of titanium；
After having determined the dosage of niobium powder, then determine the dosage of Binder Phase
Further, the niobium powder additional amount is the weight percent 0.5%-2% of the nitrogen carbide of titanium.
Further, it under more atmosphere sinterings, is sintered using the method for inflated with nitrogen；So that being closed when more atmosphere sinterings
It is golden to be full of nitrogen in vitro, it is dense due to nitrogen, the escape of fixed nitrogen in alloy body is not only inhibited, while can also make alloy
Surface sufficiently nitrogenized.
The invention has the advantages that
It 1, is nitrogenous steel bonded carbide according to the steel bonded carbide that manufacture craft of the present invention is made, in the nitrogenous of formation
Contain suitable nitrogen in steel bonded carbide, after nitrogen is added, β (N) crystal grain is in than unazotized β crystal grain more refinement
Spherical distribution then has higher intensity and toughness compared to unazotized steel bonded carbide.
2, the nitrogenous steel bonded carbide made according to manufacture craft of the present invention, by refining structure, so that oxytolerant
The property changed is also better than common steel bonded carbide.First by Binder Phase solutionizing, the free carbon in comminuted steel shot can be sufficiently reduced, thus,
Reduce the escape of nitrogen.
3, suitable niobium powder is added in the production of nitrogenous steel bonded carbide, niobium powder can be dissociated before liquid phase occurs in alloy
Carbon is carbonized, meanwhile, niobium can also react with nitrogen and generate niobium nitride.In this way, just directly or indirectly prevent the escape of nitrogen.
Specific embodiment
The description of a step is done to the present invention below with reference to embodiment:
Embodiment one
A kind of preparation method of nitrogenous steel bonded carbide, using the TiCN powder of special facture as hard phase, with chromium steel
Powder mixes TiCN powder and chromium steel powder as Binder Phase, and the nitrogenous steel bonded carbide of fabricated in situ together.
The TiCN powder of the special facture refers to by adjusting the ratio of carbon black and titanium dioxide and control sintering temperature
The flow of degree and nitrogen produces free carbon lower than 0.15% and oxygen is lower than 0.6% TiCN.
Described is to use to pass through pretreated comminuted steel shot as Binder Phase using comminuted steel shot as Binder Phase.The pretreated chromium
Comminuted steel shot is sufficiently to reduce the free carbon in chromium steel powder first by chromium steel powder solutionizing.
It is described by fabricated in situ sinter into steel bonded carbide be when making nitrogenous hard alloy steel bonded carbide,
By TiCN powder and chromium steel powder and niobium powder after wet-milling, drying, mixing glue, compression moulding, nitrogen charging sintering production nitrogenous steel is taken
Bond hard alloy.
Described mix TiCN powder with chromium steel powder is to be according to TiCN powder and the weight ratio of chromium steel powder
Ratio between TiCN powder 30%-70%, between chromium steel powder 28%-68% is mixed in blender, is carried out after mixing wet
Mill.
Being added when mixing TiCN powder and chromium steel powder has niobium powder, gives fixed nitrogen by the measure of niobium powder.
Niobium powder additional amount is TiCN powder weight percent 0.5%-2%.
Under more atmosphere sinterings, it is sintered using the method for inflated with nitrogen.So that being filled outside alloy body when more atmosphere sinterings
Full nitrogen, by improving the nitrogen concentration in furnace, it is suppressed that the escape of fixed nitrogen in alloy body, while also the surface of alloy can be made to obtain
To abundant nitridation.
It is GT class (the main trade mark) steel-bonded carbide, TiCN and chromium according to method nitrogenous steel bonded carbide produced
Comminuted steel shot and the weight percent of niobium powder proportion are as follows:
Nitrogen carbide chromium steel powder (self-control) niobium powder of trade mark titanium
GT30 30 68-69.5 0.5-2
GT35 35 63-64.5 0.5-2
GT40 40 58-59.5 0.5-2
Wherein, the specific dosage of niobium powder will be depending on the number of the actual free carbon content of hard phase.Determining niobium powder
Dosage after, then determine Binder Phase dosage.
The nitrogenous steel bonded carbide crystal grain more refinement manufactured in this way, and be in spherical distribution, then phase
Than there is higher intensity, hardness and toughness in unazotized steel bonded carbide.In addition, nitrogenous steel bonded carbide
Oxidative resistance it is also better than common steel bonded carbide.
Embodiment two
A kind of preparation method of nitrogenous steel bonded carbide, using TiCN as hard phase, using manganese steel as Binder Phase, first
Special facture TiCN, then titanium nitride powder is mixed with manganese steel powder, and use powder metallurgy process fabricated in situ nitrogenous steel
Bond hard alloy.
Described is when making titanium nitride powder, by adjusting carbon black and titanium dioxide to titanium nitride powder progress special facture
Ratio, control sintering temperature and nitrogen flow, produce free carbon lower than 0.15% and oxygen be lower than 0.6% TiCN.
The comminuted steel shot is to be uniformly mixed using a variety of materials of the composition proportion by required steel and pass through pretreated steel
Powder is as Binder Phase.The pretreated manganese steel powder is sufficiently to reduce the free carbon in manganese steel powder first by manganese steel powder solutionizing.
Described by in-situ sintering is when making nitrogenous steel bonded carbide, by TiCN powder at steel bonded carbide
It is mixed with manganese steel powder, nitrogen charging sintering is taken to make nitrogenous steel bonded carbide.
Described mix TiCN powder and manganese steel powder is weight proportion according to TiCN powder and manganese steel powder
Between TiCN powder 30%-70%, ratio of the manganese steel powder between 28%-68% mixed in blender, mix it is laggard
Row wet-milling.
Being added when mixing TiCN powder and manganese steel powder has niobium powder, gives fixed nitrogen by the measure of niobium powder.
Niobium powder additional amount is the percentage 0.5%-2% of TiCN powder weight.
It under more atmosphere sinterings, is sintered using the method for inflated with nitrogen, so that being filled outside alloy body when more atmosphere sinterings
Full nitrogen.By improving the nitrogen concentration in furnace, it is suppressed that the escape of fixed nitrogen in alloy body, while also the surface of alloy can be made to obtain
To abundant nitridation.
It is TM class (the main trade mark) steel-bonded carbide according to method nitrogenous steel bonded carbide produced, (certainly using manganese steel
System) it is used as Binder Phase, TiCN is mixed as hard phase, by TiCN with manganese steel powder, and is added in right amount in mixture
Niobium powder.The nitrogen carbide of titanium and the weight percent of manganese steel powder and niobium powder are as follows:
Nitrogen carbide manganese steel powder (self-control) niobium powder of trade mark titanium
TM30 70 28-29.5 0.5-2
TM52 48 50-51.5 0.5-2
TM60 40 58-59.5 0.5-2
Wherein, the specific dosage of niobium powder will be depending on the number of the actual free carbon content of hard phase.Determining niobium powder
Dosage after, then determine Binder Phase dosage.
The nitrogenous steel bonded carbide crystal grain more refinement manufactured in this way, and be in spherical distribution, then phase
Than there is higher intensity, hardness and toughness in unazotized steel bonded carbide.In addition, nitrogenous steel bonded carbide
Oxidative resistance it is also better than common steel bonded carbide.
Embodiment three
A kind of preparation method of nitrogenous steel bonded carbide, using nitridation titanium valve and titanium carbide mixture as hard phase, with vanadium
Steel first pre-processes titanium nitride and titanium carbide mix powder as Binder Phase, then nitridation titanium valve is mixed with titanium carbide
Object and vanadium steel powder after mixing, carry out wet-milling, mix glue, drying, compacting, then in more atmosphere sintering furnaces nitrogen charging sinter into it is nitrogenous
Steel bonded carbide.
It is in production nitridation titanium valve and titanium carbide mixture that described pair of nitridation titanium valve and titanium carbide mixture, which carry out pretreatment,
When, by adjusting the ratio of carbon black and titanium dioxide and control sintering temperature sufficiently to reduce the free carbon (titanium nitride in titanium carbide
Theoretically be free of free carbon), make the free carbon in titanium nitride and titanium carbide mixture lower than 0.15% and oxygen content is lower than 0.6%.
Described is to use to pass through pretreated comminuted steel shot as Binder Phase using comminuted steel shot as Binder Phase；The pretreated vanadium
Comminuted steel shot is sufficiently to reduce the free carbon in vanadium steel powder first by vanadium steel powder solutionizing.
It is described by in-situ sintering at steel bonded carbide be when making nitrogenous steel bonded carbide, will nitridation titanium valve with
Titanium carbide mixture and vanadium steel powder after mixing, carry out wet-milling, mix glue, drying, compacting, then the nitrogen charging in more atmosphere sintering furnaces
Sinter nitrogenous steel bonded carbide into.Described mix nitridation titanium valve and titanium carbide mixture and vanadium steel powder is according to nitrogen
The weight proportion for changing titanium valve and titanium carbide mixture and vanadium steel powder is titanium nitride and titanium carbide mixture between 30%-70%, vanadium
Ratio of the comminuted steel shot between 28%-68% is mixed in blender, and wet-milling is carried out after mixing.
Being added when that will nitrogenize titanium valve and carbonized titanium powder mixture and vanadium steel powder mixes has niobium powder, passes through niobium powder
Measure gives fixed nitrogen.
Niobium powder additional amount is the 0.5%-2% for nitrogenizing the mixture weight of titanium valve and carbonized titanium powder.
Under more atmosphere sinterings, it is sintered using the method for inflated with nitrogen；So that being filled outside alloy body when more atmosphere sinterings
Full nitrogen, by improving the nitrogen concentration in furnace, it is suppressed that the escape of nitrogen in alloy body, or even also the surface of alloy can be made to be filled
Divide nitridation.
It is TM class (the main trade mark) steel-bonded carbide according to method nitrogenous steel bonded carbide produced, using vanadium steel powder
(self-control) is used as Binder Phase, and nitridation titanium valve and titanium carbide mixture are used as hard phase, by nitridation titanium valve and titanium carbide mixture and
The mixing of vanadium steel powder, and suitable niobium powder is added in mixture；Nitrogenize titanium valve and titanium carbide mixture and vanadium steel powder and niobium powder
Weight percent is as follows:
Nitrogen carbide vanadium steel powder (self-control) niobium powder of trade mark titanium
TM30 70 28-29.5 0.5-2
TM52 48 50-51.5 0.5-2
TM60 40 58-59.5 0.5-2
Wherein, the specific dosage of niobium powder will be depending on the number of the actual free carbon content of hard phase.Determining niobium powder
Dosage after, then determine Binder Phase dosage.
The technical standard of conventional steel-bonded carbide (titanium carbide base) trade mark and the steel-bonded carbide using the production of TiCN base
Technical indicator comparison (test measured value) is as follows:
It will be apparent that without departing from the principles of the present invention, several improvement or modification made are regarded as the present invention
Protection scope.
Through the foregoing embodiment it is known that the present invention relates to a kind of preparation method of nitrogenous steel bonded carbide, use
The nitrogen carbide powder of titanium is as hard phase, using comminuted steel shot as Binder Phase, makes nitrogenous steel knot by powder metallurgy production method
Hard alloy；First the nitrogen carbide powder of titanium is handled before production, then the nitrogen carbide powder of titanium is blended in comminuted steel shot
Together, and together in-situ sintering is at nitrogenous steel bonded carbide.
Further, the nitrogen carbide powder to titanium pass through when processing refers to the nitrogen carbide powder of production titanium
The ratio of carbon black and titanium dioxide is adjusted, and the flow for controlling sintering temperature and nitrogen produces free carbon lower than 0.15% or less, oxygen
Content is lower than the nitrogen carbide of 0.6% titanium below.
Further, the nitrogen carbide of the titanium include TiCN, titanium nitride and titanium carbide mixture or titanium nitride and
The mixture of TiCN and any weight percent of titanium carbide.
Further, described is to use to pass through pretreated comminuted steel shot as Binder Phase using comminuted steel shot as Binder Phase；Described
Pretreated comminuted steel shot is sufficiently to reduce the free carbon in comminuted steel shot first by comminuted steel shot solutionizing.
It is further, described that sinter steel bonded carbide by fabricated in situ be to make nitrogenous hard alloy steel knot hard
When matter alloy, the nitrogen carbide of titanium is mixed with comminuted steel shot, nitrogen charging sintering is taken to make nitrogenous steel bonded carbide.
Further, it is nitrogen carbide and steel according to titanium that the nitrogen carbide powder by titanium and comminuted steel shot, which mix,
The weight proportion of powder is the nitrogen carbide of titanium between 30%-70%, ratio progress wet-milling mixing of the comminuted steel shot between 28%-68%.
Further, being added when the nitrogen carbide of titanium is mixed with comminuted steel shot has niobium powder, gives fixed nitrogen by the addition of niobium powder.
Further, the specific dosage of the niobium powder is determined according to the actual free carbon content of nitrogen carbide of titanium；
After having determined the dosage of niobium powder, then determine the dosage of Binder Phase
Further, the niobium powder additional amount is the weight percent 0.5%-2% of the nitrogen carbide of titanium.
Further, it under more atmosphere sinterings, is sintered using the method for inflated with nitrogen；So that being closed when more atmosphere sinterings
It is golden to be full of nitrogen in vitro, it is dense due to nitrogen, the escape of fixed nitrogen in alloy body is not only inhibited, while can also make alloy
Surface sufficiently nitrogenized.
For the present inventor by analysis and research, discovery titanium is six aspect heart lattice structures, it can be with hydrogen, carbon, nitrogen, oxygen, boron etc.
Form intermittent solid solution.Need to be added a certain amount of carbon black (a part is brought into for hard phase) during due to fabricated in situ steel,
Under thermodynamics driving, the carbon of high concentration can constantly occupy the position of nitrogen and so that fixed nitrogen is formed nitrogen and run away, thus formed
(certainly, under thermodynamic (al) driving, copmbined-carbon also can make part fixed nitrogen be converted to nitrogen, only very micro- for the escape of nitrogen
It is weak to ignore).
For this purpose, the invention is characterized in that the measure of three aspects, is reduced to negligible degree for the escape of nitrogen.
1, first by Binder Phase solutionizing, the free carbon in comminuted steel shot is sufficiently reduced
The liquid phase of steel is broken if there is being difficult to after liquid phase generally 1400 degree or so (liquid phases under eutectic temperature).Cause
This, the comminuted steel shot raw material mixed sintering must be controlled in the abundant tempering of raw material but cannot liquefied temperature.By a large amount of
Experiment, the control of this temperature is best between 1250-1280 degree.
2, hard phase selection
Since the gap of titanium carbide mutually only has carbon, due to when titanium white production titanium carbide there are certain invertibity,
Control free carbon is difficult.And TiCN is quite different, since gap is mutually carbon and two kinds of nitrogen, if the tune when producing TiCN
The ratio of whole good carbon black and titanium dioxide and the flow for controlling sintering temperature and nitrogen, so that it may it is very low to produce oxygen content
The TiCN of (0.6% or less) and free carbon also very low (0.15% or less).
3, suitable niobium powder is added
Although we take the measure of front two, but cannot avoid the escape of nitrogen completely, because, hard phase and Binder Phase
In still with the presence of substantial portion of free carbon.Therefore, we, which take, is added the measure of appropriate niobium powder and gives fixed nitrogen.Because of niobium
Powder can be carbonized before liquid phase occurs in alloy by free carbon, meanwhile, niobium can also react with nitrogen and generate niobium nitride.In this way, just
Directly or indirectly prevent the escape of nitrogen.
4, nitrogen charging is sintered
Under more atmosphere sinterings, new invention is used to be sintered in the method that nitrogen replaces argon gas.In this way, outside alloy body by
In the dense of nitrogen, the escape of nitrogen in alloy body is not only inhibited, or even also the surface of alloy can be made sufficiently to be nitrogenized.
The invention has the advantages that
1, contain suitable nitrogen in the nitrogenous steel bonded carbide of formation, after nitrogen is added, β (N) crystal grain is than unazotized β
Crystal grain more refinement, and be in spherical distribution, then compared to unazotized steel bonded carbide have higher intensity, hardness and
Toughness.
2, in nitrogenous steel bonded carbide by refinement structure, so that oxidative resistance is also better than common steel bonded carbide.
First by Binder Phase solutionizing, the free carbon in comminuted steel shot can be sufficiently reduced.
Suitable niobium powder is added in nitrogenous steel bonded carbide, niobium powder can be before liquid phase occurs in alloy by free carbon institute carbon
Change, meanwhile, niobium can also react with nitrogen and generate niobium nitride.In this way, just directly or indirectly prevent the escape of nitrogen.
Claims (10)
1. a kind of preparation method of nitrogenous steel bonded carbide, which is characterized in that using the nitrogen carbide powder of titanium as hard
Phase makes nitrogenous steel bonded carbide by powder metallurgy production method using comminuted steel shot as Binder Phase.First to the nitrogen of titanium before production
Carbide powder is handled, then the nitrogen carbide powder of titanium is blended in comminuted steel shot, and together in-situ sintering at nitrogenous steel knot
Hard alloy.
2. the preparation method of nitrogenous steel bonded carbide according to claim 1, which is characterized in that the nitrogen carbon to titanium
Compound powder carries out handling ratio when referring to the nitrogen carbide powder for making titanium by adjusting carbon black and titanium dioxide, and controls burning
The flow of junction temperature and nitrogen produces the nitrogen carbide of titanium of the free carbon lower than 0.15%, oxygen content lower than 0.6%.
3. the preparation method of nitrogenous steel bonded carbide according to claim 2, which is characterized in that the nitrogen of the titanium is carbonized
Object includes TiCN or titanium nitride and any weight percent such as titanium carbide, titanium nitride and TiCN and titanium carbide
Mixture.
4. the preparation method of nitrogenous steel bonded carbide according to claim 1, which is characterized in that it is described using comminuted steel shot as
Binder Phase is used by pretreated comminuted steel shot as Binder Phase.The pretreated comminuted steel shot is first to fill comminuted steel shot solutionizing
Divide the free carbon reduced in comminuted steel shot.
5. the preparation method of nitrogenous steel bonded carbide according to claim 1, which is characterized in that described to pass through conjunction in situ
It is that the nitrogen carbide of titanium and comminuted steel shot are blended in one when making nitrogenous steel bonded carbide at steel bonded carbide is sintered into
It rises, nitrogen charging sintering is taken to make nitrogenous steel bonded carbide.
6. the preparation method of nitrogenous steel bonded carbide according to claim 4, which is characterized in that the nitrogen carbon by titanium
Compound powder and comminuted steel shot, which mix, to be existed according to the nitrogen carbide that the nitrogen carbide of titanium and the weight proportion of comminuted steel shot are titanium
Between 30%-70%, ratio of the comminuted steel shot between 28%-68% carry out wet-milling mixing.
7. the preparation method of nitrogenous steel bonded carbide according to claim 4, which is characterized in that in the nitrogen carbide of titanium
Being added when mixing with comminuted steel shot has niobium powder, gives fixed nitrogen by the addition of niobium powder.
8. the preparation method of nitrogenous steel bonded carbide according to claim 5, which is characterized in that the tool of the niobium powder
Body dosage is determined according to the actual free carbon content of nitrogen carbide of titanium.After having determined the dosage of niobium powder, then determine viscous
Tie the dosage of phase.
9. the preparation method of nitrogenous steel bonded carbide according to claim 5, which is characterized in that the niobium powder is added
Amount is the 0.5%-2% of the nitrogen carbide weight of titanium.
10. the preparation method of nitrogenous steel bonded carbide according to claim 4, which is characterized in that in more atmosphere sinterings
Under, it is sintered using the method for inflated with nitrogen, makes to be full of nitrogen when more atmosphere sinterings outside alloy body.Due to nitrogen concentration very
Height not only inhibits the escape of fixed nitrogen in alloy body, while also the surface of alloy can be made sufficiently to be nitrogenized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910100135.8A CN109852870B (en) | 2019-01-31 | 2019-01-31 | Preparation method of nitrogen-containing steel bonded hard alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN111575599A (en) * | 2020-05-19 | 2020-08-25 | 湘潭大学 | Precipitation strengthening type high-temperature steel bonded hard alloy and preparation method thereof |
| CN113441722A (en) * | 2021-03-31 | 2021-09-28 | 株洲力洲硬质合金有限公司 | Titanium carbonitride bar and preparation method thereof |
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