CN109652697A - One kind containing the WC-8%Co hard alloy of (V, Ti) (C, N) solid-solution powder - Google Patents

One kind containing the WC-8%Co hard alloy of (V, Ti) (C, N) solid-solution powder Download PDF

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CN109652697A
CN109652697A CN201710948301.0A CN201710948301A CN109652697A CN 109652697 A CN109652697 A CN 109652697A CN 201710948301 A CN201710948301 A CN 201710948301A CN 109652697 A CN109652697 A CN 109652697A
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hard alloy
powder
solid
alloy
solution powder
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刘启乐
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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
    • 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
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Abstract

In order to improve hardness, the wearability of WC-Co hard alloy, it is prepared for a kind of WC-8%Co hard alloy for containing (V, Ti) (C, N) solid-solution powder.Using WC, Co, TiO2, carbon black powders be raw material, the addition of (V, Ti) (C, N) powder can promote the mechanical property of hard alloy.Its mechanism of action is that the addition of (V, Ti) (C, N) powder is able to suppress the abnormal growth of hard alloy crystal grain during the sintering process, has the function that refine crystal grain, improves densification.The obtained WC-8%Co hard alloy containing (V, Ti) (C, N) solid-solution powder, hardness, densification degree, bending strength are all increased dramatically.The present invention can provide a kind of new production technology to prepare high performance WC-8Co hard alloy.

Description

One kind containing the WC-8%Co hard alloy of (V, Ti) (C, N) solid-solution powder
Technical field
The present invention relates to a kind of cemented carbide materials, more particularly to a kind of WC-8% for containing (V, Ti) (C, N) solid-solution powder Co hard alloy.
Background technique
Hard alloy be by one or more high rigidity, high-modulus interstitial compound (usually WC and transition-metal Fe, Co, Ni or its alloy) composition composite material, WC-Co hard alloy is due to a system such as its high rigidity, high intensity and high-wearing feature Column excellent performance and be widely used in the industries such as machining, mining, military project and metallurgy.WC-Co hard alloy quilt It is described as " industrial tooth ", how to be targetedly the research hotspot in the field according to purposes research or development high performance material.
In the case where Binder Phase content is certain, when WC grain degree is reduced to 1.0 μm or less, the hardness of hard alloy, Intensity is improved, and application field is more extensive.With growing up for crystal grain, alloy mechanical strength reduction, coarse WC grain is also It will lead to alloy fracture.However during the sintering process if effectively WC grain cannot be inhibited to grow up, the strength and toughness of alloy is bright Aobvious decline.Therefore, the cemented carbide powder for preparing appropriate partial size just seems most important.
Summary of the invention
The purpose of the invention is to improve the hardness of WC-Co hard alloy, wearability, devise a kind of containing (V, Ti) The WC-8%Co hard alloy of (C, N) solid-solution powder.
The technical solution adopted by the present invention to solve the technical problems is:
The raw material for preparing of WC-8%Co hard alloy containing (V, Ti) (C, N) solid-solution powder includes: the WC powder that partial size is 1.4 μm End, the Co powder that partial size is 1.3 μm, partial size < 100nm TiO2, partial size be 80nm carbon black.
The preparation step of WC-8%Co hard alloy containing (V, Ti) (C, N) solid-solution powder are as follows: by raw material powder by experiment Design scheme carries out weighing ingredient, and then the mixture prepared is put into polyurethane vinyl ball grinder and carries out ball milling, when ball milling Between be 12h, ball-milling medium is dehydrated alcohol, ratio of grinding media to material 8:1.Slurry after wet-milling is dry, mix glue, then pelletize. By the powder prepared compression moulding on a hydraulic press, the green compact made is placed in low-pressure sintering furnace and is sintered for 1450 DEG C, Keep the temperature 30min.Finally, roughly grinding sintering blank to 30mm × 5mm × 5mm size.
The detecting step of WC-8%Co hard alloy containing (V, Ti) (C, N) solid-solution powder are as follows: bending strength test according to Using GB/T3851-1983, Vickers hardness uses Vickers, and fracture toughness uses indentation method, microstructure using SEM, BSE-SEM。
The WC-8%Co hard alloy containing (V, Ti) (C, N) solid-solution powder, the addition of (V, Ti) (C, N) powder The mechanical property of hard alloy can be promoted.Its mechanism of action is that the addition of (V, Ti) (C, N) powder is able to suppress hard alloy crystalline substance The abnormal growth of grain during the sintering process has the function that refine crystal grain, improves densification.
The WC-8%Co hard alloy containing (V, Ti) (C, N) solid-solution powder, the Ti in (V, Ti) (C, N) powder Element additive amount can also generate certain influence to the mechanical property of hard alloy.The addition of Ti element is able to ascend hard alloy Bending strength, but the additive amount of Ti element need control in an accurate range.If the additive amount of Ti element is excessive, It then will lead to the excessive magazine element of alloy internal residual, reduce hard alloy object phase distribution consistency degree, reduce the power of hard alloy Learn performance.It is not up to standard to the promotion of hard alloy bending strength if the additive amount of Ti element is very few.
The WC-8%Co hard alloy containing (V, Ti) (C, N) solid-solution powder, the addition of (V, Ti) (C, N) powder Also it should control in a true scope, if adding too much, impurity can be left inside alloy.If additive amount is insufficient, It then can not effectively inhibit growing up for internal grain, cannot sufficiently refine crystal grain.When the additive amount of (V, Ti) (C, N) powder is When 1%, obtained hard alloy has optimal comprehensive mechanical performance, and 500MPa and 1345HV has been respectively increased in hardness30。
The beneficial effects of the present invention are:
Using WC, Co, TiO2, carbon black powders be raw material, successfully made by ingredient, ball milling, drying, granulation, forming, sintering process For the WC-8%Co hard alloy containing (V, Ti) (C, N) solid-solution powder with excellent mechanical performance.Wherein, (V, Ti) (C, N) solid-solution powder can preferably inhibit hard alloy crystal grain growing up during the sintering process, this is also preparation containing (V, Ti) The reason of WC-8%Co hard alloy mechanical property of (C, N) solid-solution powder improves.Obtained is dissolved containing (V, Ti) (C, N) The WC-8%Co hard alloy of body powder, hardness, densification degree, bending strength are all increased dramatically.The present invention can be It prepares high performance WC-8Co hard alloy and a kind of new production technology is provided.
Specific embodiment
Case study on implementation 1:
The raw material for preparing of WC-8%Co hard alloy containing (V, Ti) (C, N) solid-solution powder includes: the WC powder that partial size is 1.4 μm End, the Co powder that partial size is 1.3 μm, partial size < 100nm TiO2, partial size be 80nm carbon black.Containing (V, Ti) (C, N) solid solution The preparation step of the WC-8%Co hard alloy of powder are as follows: raw material powder is subjected to weighing ingredient by experimental design, then will The mixture prepared, which is put into polyurethane vinyl ball grinder, carries out ball milling, and Ball-milling Time 12h, ball-milling medium is dehydrated alcohol, Ratio of grinding media to material is 8:1.Slurry after wet-milling is dry, mix glue, then pelletize.The powder prepared is suppressed on a hydraulic press Molding, the green compact made is placed in low-pressure sintering furnace and is sintered for 1450 DEG C, keeps the temperature 30min.Finally, will sintering blank corase grinding To 30mm × 5mm × 5mm size.The detecting step of WC-8%Co hard alloy containing (V, Ti) (C, N) solid-solution powder are as follows: anti- Curved strength test is according to GB/T3851-1983 is used, and Vickers hardness uses Vickers, and fracture toughness uses indentation method, shows Micromorphology uses SEM, BSE-SEM.
Case study on implementation 2:
There is relatively high density, bending strength and hardness using hard alloy made from this technique, but fracture toughness is slightly lower. Ti atom can effectively solution strengthening Binder Phase, and Ti atom can be filled into the micropore inside alloy, in alloy Micro-pore causes the premature failure of alloy often as formation of crack, thus Ti atom can effectively improve alloy density, Bending strength and hardness.Dissolubility, migration and wetability of the V atom in bonding phase Co are better than Ti atom, so, it is made Hard alloy have relatively high fracture toughness.
Case study on implementation 3:
It is respectively 4580MPa, 2571HV using the bending strength, hardness and fracture toughness of hard alloy made from this technique30、 9.43MPa·m1/2, there is more excellent comprehensive mechanical performance.
Case study on implementation 4:
Crystallite dimension using hard alloy made from this technique is more tiny.During the sintering process, C atom and N atom because Size is smaller, can be dissolved into first in bonding phase, and with the further raising of temperature, V atom is gradually diffused into bonding phase, Ti atom is because be higher than the eutectic temperature of V atom and Co phase with the eutectic temperature of Co phase, and finally dissolution enters in Co phase.
Case study on implementation 5:
The average grain size for being not added with the hard alloy of grain refiner is about 3.7 μm, and is added to the conjunction of grain refiner The crystallite dimension of gold is about 0.2 μm.During the sintering process, little particle WC dissolves first in bonding phase, then at big Caused by precipitation on grain WC grain；Growing up for WC grain mainly can control by the interface of WC grain.Grain refiner can have Effect ground reduces interface energy, slows down the solution modeling process of WC, and then inhibit both continuously and discontinuously growing up for WC grain.
Case study on implementation 6:
With the increase of Ti content in fining agent, the size of WC grain is gradually increased in alloy, this is because the crystal grain of Ti atom Refining effect is less than V atom, with the increase of Ti content in fining agent, inhibiting effect that grain refiner grows up to WC grain Weaken, the crystallite dimension of alloy increases.It is added to the mechanical property of the WC base cemented carbide of the grain refiner of different Ti contents With the increase of Ti content, the bending strength of WC base cemented carbide is gradually decreased.With the increase of Ti content in grain refiner, The size of WC grain is gradually increased in alloy.Dissolubility, migration and wetability of the Ti atom in bonding phase are less than V original Son, so being bonded the worsened wettability of phase with the increase of Ti content in grain refiner.Solid-solution powder is relative to other two The solid-solution powder of kind Ti content can improve the mechanical property of alloy to the maximum extent: bending strength 3689MPa, hardness are 1748HV30, fracture toughness 11.37MPam1/2。
Case study on implementation 7:
Solid-solution powder can effectively improve the hardness of WC-8%Co hard alloy, this can have mainly due to grain refiner Effect ground prevents the continuous and discontinuous of WC grain from growing up, and refines WC grain, improves the hardness of WC base cemented carbide.It is certain when being added After the grain refiner of amount, the fracture toughness decrease to some degree of alloy；The fracture toughness of alloy is mainly by WC grain Size is bonded ingredient, distribution and the influence of porosity of phase.After a certain amount of grain refiner is added in alloy, brittlement phase Caused by aggregation is precipitated with the interface of Nian Jie phase in WC: N element has the work for significantly reducing V element solubility in Co phase With being bonded oversaturated V element and W, C atomic reaction in phase, formed with Nian Jie phase interface in a manner of crystallization nucleation in WC crisp Property object be precipitated, cause the reduction of alloy fracture toughness.When the content of Ti element is no more than 21% in grain refiner, Ti element Content is mainly larger to the bending strength influence of WC base cemented carbide, and the influence of the hardness and fracture toughness to alloy is made With unobvious.

Claims (4)

1. one kind containing (V, Ti) (C, N) solid-solution powder WC-8%Co hard alloy prepare raw material include: partial size be 1.4 μm WC powder, partial size be 1.3 μm Co powder, partial size < 100nm TiO2, partial size be 80nm carbon black.
2. the WC-8%Co hard alloy according to claim 1 containing (V, Ti) (C, N) solid-solution powder, it is characterized in that containing The preparation step of the WC-8%Co hard alloy of (V, Ti) (C, N) solid-solution powder are as follows: by raw material powder by experimental design into Row weighs ingredient, and then the mixture prepared is put into polyurethane vinyl ball grinder and carries out ball milling, Ball-milling Time 12h, ball Grinding media is dehydrated alcohol, ratio of grinding media to material 8:1, the slurry after wet-milling is dry, mix glue, is then pelletized, by what is prepared The green compact made is placed in low-pressure sintering furnace and is sintered for 1450 DEG C by powder compression moulding on a hydraulic press, keeps the temperature 30min, Finally, roughly grinding sintering blank to 30mm × 5mm × 5mm size.
3. the WC-8%Co hard alloy according to claim 1 containing (V, Ti) (C, N) solid-solution powder, it is characterized in that WC-8%Co hard alloy detecting step containing (V, Ti) (C, N) solid-solution powder are as follows: bending strength test is according to using GB/ T3851-1983, Vickers hardness use Vickers, and fracture toughness uses indentation method, and microstructure uses SEM, BSE-SEM.
4. the WC-8%Co hard alloy according to claim 1 containing (V, Ti) (C, N) solid-solution powder, it is characterized in that institute The WC-8%Co hard alloy containing (V, Ti) (C, N) solid-solution powder stated, the addition of (V, Ti) (C, N) powder can promote hard The mechanical property of alloy, the mechanism of action are that the addition of (V, Ti) (C, N) powder is able to suppress hard alloy crystal grain sintered Abnormal growth in journey has the function that refine crystal grain, improves densification, described containing (V, Ti) (C, N) solid-solution powder WC-8%Co hard alloy, the Ti element additive amount in (V, Ti) (C, N) powder also can generate one to the mechanical property of hard alloy Fixed influence, the addition of Ti element is able to ascend the bending strength of hard alloy, but the additive amount of Ti element needs to control In one accurate range, if the additive amount of Ti element is excessive, the excessive magazine element of alloy internal residual will lead to, reduce hard Matter alloy object phase distribution consistency degree, reduces the mechanical property of hard alloy, if the additive amount of Ti element is very few, to hard alloy The promotion of bending strength is not up to standard, the WC-8%Co hard alloy containing (V, Ti) (C, N) solid-solution powder, (V, Ti) (C, N) addition of powder should also control in a true scope, if adding too much, impurity can be left inside alloy, if Additive amount is insufficient, then can not effectively inhibit growing up for internal grain, cannot sufficiently refine crystal grain, when (V, Ti) (C, N) powder When the additive amount at end is 1%, obtained hard alloy has optimal comprehensive mechanical performance, and hardness is respectively increased 500MPa and 1345HV30。
CN201710948301.0A 2017-10-12 2017-10-12 One kind containing the WC-8%Co hard alloy of (V, Ti) (C, N) solid-solution powder Pending CN109652697A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110629133A (en) * 2019-09-30 2019-12-31 成都工业学院 Carbon fiber- (Ti, V) (C, N) hard alloy and preparation method thereof
EP4091739A4 (en) * 2020-01-14 2024-01-24 Nippon Tokushu Goukin Co Ltd Ultrafine cemented carbide, and shearing tool, cutting tool, or abrasion-resistant tool using ultrafine cemented carbide

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110629133A (en) * 2019-09-30 2019-12-31 成都工业学院 Carbon fiber- (Ti, V) (C, N) hard alloy and preparation method thereof
CN110629133B (en) * 2019-09-30 2020-11-06 成都工业学院 Carbon fiber- (Ti, V) (C, N) hard alloy and preparation method thereof
EP4091739A4 (en) * 2020-01-14 2024-01-24 Nippon Tokushu Goukin Co Ltd Ultrafine cemented carbide, and shearing tool, cutting tool, or abrasion-resistant tool using ultrafine cemented carbide

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