CN109652727A - A kind of regeneration WC-8Co hard alloy containing Y2O3 - Google Patents
A kind of regeneration WC-8Co hard alloy containing Y2O3 Download PDFInfo
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- CN109652727A CN109652727A CN201710949330.9A CN201710949330A CN109652727A CN 109652727 A CN109652727 A CN 109652727A CN 201710949330 A CN201710949330 A CN 201710949330A CN 109652727 A CN109652727 A CN 109652727A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/067—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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- 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
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
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Abstract
In order to improve hardness, the wearability of regeneration WC-Co hard alloy, it is prepared for a kind of regeneration WC-8Co hard alloy containing Y2O3.Use zinc melt method recycling WC-Co composite powder end for raw material, Y2O3Addition can significantly improve the hardness and bending strength of hard alloy, the mechanism for being able to ascend hard alloy mechanical property be can inhibit during the sintering process crystal grain grow up and misgrowth.The addition of Y2O3 can make the bending strength of YG8 hard alloy be increased to 2120MPa from 1780MPa.Secondary ball milling technique, which can be made, mixes more uniform composite powder.The combination of two kinds of preparation processes is the key that obtained hard alloy has excellent mechanical performance.The obtained regeneration WC-8Co hard alloy containing Y2O3, 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-Co hard alloy.
Description
Technical field
The present invention relates to a kind of cemented carbide material more particularly to a kind of regeneration WC-8Co hard alloy containing Y2O3.
Background technique
WC-Co hard alloy is known as " industrial tooth ", is widely used in the every field such as mining, cutting, mold,
Have become the indispensable important materials of modern society.It how to be targetedly this according to purposes research or development high performance material
The research hotspot in field.Ultra-fine WC-Co Cemented Carbide have hardness more higher than common WC-Co hard alloy, preferably it is wear-resisting
The superior functions such as property, higher cross-breaking strength and more good fracture toughness are widely used in metal cutting process, resistance to
The fields such as part are ground, there is the huge market demand.
The chemical formula of yttrium oxide is Y2O3, and No. CAS is 1314-36-9, white yellowish crystalline powder.It is not soluble in water and
Alkali is dissolved in acid and alcohol.Easy absorbing carbon dioxide and water when being placed in air and go bad.As white heat lamp mantle processed, colour
TV fluorescent powder, magnetic material additive, are also used to atomic energy industry etc..Yttrium oxide alias has yttrium oxygen, yttria, oxidation
Yttrium (III), yttrium oxide, yttrium oxide rake thin etc..Not soluble in water and alkali, is dissolved in acid.One of purposes is used as fluorescent powder, magnetic material
Added material.
Summary of the invention
The purpose of the invention is to improve hardness, the wearability of regeneration WC-Co hard alloy, devise a kind of containing Y2O3
Regeneration WC-8Co hard alloy.
The technical solution adopted by the present invention to solve the technical problems is:
The raw material for preparing of regeneration WC-8Co hard alloy containing Y2O3 includes: the WC-Co composite powder end that method recycling is melted using zinc.
The preparation step of regeneration WC-8Co hard alloy containing Y2O3 are as follows: claim starting powder by experimental design
Weight, ingredient, carry out wet-milling to it after preparing, ball-milling medium is the hexane of dosage 170mL/kg, ratio of grinding media to material 7:1, Ball-milling Time
For for 24 hours.After ball milling, the wet-milling material in pellet is uninstalled, then proceedes to ball milling for 24 hours.Ball milling terminates to receive again, by the ownership
The pellet obtained is dried in vacuo, drying time 75min, and drying temperature is 80 DEG C.It is subsequently placed into press machine and is suppressed
Forming, pressing pressure 180MPa.The green compact made is put into vacuum sintering furnace and is sintered, sintering temperature is 1450 DEG C,
Soaking time is 90min.
The detecting step of regeneration WC-8Co hard alloy containing Y2O3 are as follows: the mode randomly selected is taken in the detection of sample,
10 are extracted in the sample that every group prepares to be detected, its microstructure density, hardness and bending strength is predominantly detected.
Microstructure analysis uses TM3030 scanning electron microscope, and density is measured using Archimedes principle, and hardness is measured using Rockwell hardness
Amount, bending strength use three point bending test method.
The regeneration WC-8Co hard alloy containing Y2O3, the addition of Y2O3 can significantly improve the hardness of hard alloy
And bending strength, the mechanism for being able to ascend hard alloy mechanical property be can inhibit during the sintering process crystal grain grow up and
Misgrowth.The addition of Y2O3 can make the bending strength of YG8 hard alloy be increased to 2120MPa from 1780MPa.
The regeneration WC-8Co hard alloy containing Y2O3, the flouring technology of ball milling can make raw material powder uniform twice
Mixing, so that obtained hard alloy has higher consistency, to possess higher hardness and bending strength.So
In the actual production process, the process time for needing to increase ball powder-grinding improves the mechanical property of hard alloy.
The regeneration WC-8Co hard alloy containing Y2O3, hard alloy inside seldom discovery hole and grain size are special
Big WC grain.The fracture toughness of hard alloy is also significantly enhanced.
The beneficial effects of the present invention are:
Use zinc melt method recycling WC-Co composite powder end for raw material, by ingredient, ball milling, discharging, again ball milling, drying, forming,
SPS sintering process is successfully prepared the regeneration WC-8Co hard alloy containing Y2O3 with excellent mechanical performance.Wherein, work is prepared
The selection of skill has the function of the mechanical property promotion of hard alloy very big.The addition of Y2O3 is able to suppress in sintering process firmly
Matter alloy internal grain is grown up, and secondary ball milling technique, which can be made, mixes more uniform composite powder.Two kinds of preparation processes
Combination be the key that obtained hard alloy have excellent mechanical performance.The obtained regeneration WC-8Co hard containing Y2O3
Alloy, hardness, densification degree, bending strength are all increased dramatically.The present invention can be hard to prepare high performance WC-Co
Matter alloy provides a kind of new production technology.
Specific embodiment
Case study on implementation 1:
The raw material for preparing of regeneration WC-8Co hard alloy containing Y2O3 includes: the WC-Co composite powder end that method recycling is melted using zinc.Contain
The preparation step of the regeneration WC-8Co hard alloy of Y2O3 are as follows: starting powder is weighed, ingredient by experimental design, matched
Wet-milling is carried out after good to it, ball-milling medium is the hexane of dosage 170mL/kg, and ratio of grinding media to material 7:1, Ball-milling Time is for 24 hours.Ball milling
After, the wet-milling material in pellet is uninstalled, then proceedes to ball milling for 24 hours.Ball milling terminates to receive again, will all pellets obtained into
Row vacuum drying, drying time 75min, drying temperature are 80 DEG C.It is subsequently placed into press machine and carries out compression moulding, compacting pressure
Power is 180MPa.The green compact made is put into vacuum sintering furnace and is sintered, sintering temperature is 1450 DEG C, and soaking time is
90min.The detecting step of regeneration WC-8Co hard alloy containing Y2O3 are as follows: the mode randomly selected is taken in the detection of sample,
10 are extracted in every group of sample prepared to be detected, its microstructure density, hardness and bending strength is predominantly detected.It is aobvious
Micromorphology analysis uses TM3030 scanning electron microscope, and density is measured using Archimedes principle, and hardness is measured using Rockwell apparatus,
Bending strength uses three point bending test method.
Case study on implementation 2:
Regenerate in YG8 tissue that there are more very big crystal grain, and regenerate the quantity of more uniform, the very big crystal grain of tissue of YG8-R compared with
Few, the abnormal growth of WC grain can be inhibited to a certain extent by adding Y2O3 in secondary alloy, promote its microstructure homogenization.
The rare earth added in alloy is mainly present on the crystal boundary and phase boundary of alloy with compound form, and rare earth is in crystalline substance during the sintering process
Segregation in boundary and phase boundary forms the particle of disperse, can play the role of pinning crystal boundary, hinders moving for crystal boundary to a certain extent
It moves, to inhibit growing up for WC grain.
Case study on implementation 3:
The density and hardness of regeneration YG8-R decreases, but its bending strength significantly improves, and is increased to by 2170MPa
2500MPa.It is more difficult with zinc melt in mechanical milling process since the granularity and chemical property of Y2O3 and zinc melt have larger difference
It is uniformly mixed, will form more Y2O3 reunion region in the secondary alloy of preparation, to reduce the density of regeneration YG8-R and hard
Degree.If improving the density of regeneration YG8-R, hardness and bending strength may be further increased.Regenerate YG8 and regeneration YG8-R
Shape characteristic be closer to, the tissue of two kinds of alloys is all comparatively dense, the negligible amounts of very big crystal grain.Ball-milling Time 32h's
The metallographic structure of secondary alloy is more uniformly fine and close.The regeneration YG8 of Ball-milling Time 32h and the density and hardness base for regenerating YG8-R
This is identical, and porosity is also almost the same, but the bending strength for regenerating YG8-R is higher by 500MPa than regeneration YG8, mentions from 2100MPa
Height has arrived 2600MPa.
Case study on implementation 4:
Ball-milling Time from when increasing to 32h for 24 hours, regenerate the performances such as density, hardness, bending strength and the porosity of YG8 there is no
Significant change, and the density for regenerating YG8-R significantly improves, porosity decline, hardness and bending strength are obviously improved, especially anti-
Curved intensity increases to 2870MPa from 2250MPa.For regenerating YG8, ball milling initial stage various ingredients by evenly mixing, preparation
The performance of secondary alloy has tended towards stability.For regenerating YG8-R, since its food ingredient is complex, Ball-milling Time is for 24 hours
When, various ingredients are also unmixed uniform, and the consistency for preparing secondary alloy is not high, affects work of the Y2O3 in secondary alloy
With effect, when Ball-milling Time increases to 32h, various ingredients are gradually uniformly mixed, the distribution of Y2O3 in the secondary alloy of preparation
Also more uniformly, the consistency of alloy is obviously improved, and function and effect of the Y2O3 in secondary alloy gradually show, and regenerates YG8-R
Bending strength significantly improved than being not added with the regeneration YG8 of Y2O3.
Case study on implementation 5:
In numerous performance indicators of hard alloy, bending strength is an important performance indicator.In the industrial production,
Bending strength is often used as the foundation of hart metal product quality control.There are many factor for influencing hard alloy bending strength,
Including Co content, C content, WC grain degree, defect, hole, dirt, it is mingled with, material surface conditions etc..Rare earth element is chemically
Matter is extremely active, has extremely strong affinity with the impurity elements such as oxygen, sulphur, in hard alloy sintering process rare earth easily with
The impurity elements such as oxygen, sulphur form complex compound, and purifying crystal boundary and phase boundary to improve boundary strength improves hard alloy
Physical and mechanical property.In addition, the defects of hole in hard alloy, hole position strong stress easy to form is concentrated, become
Fracture origin causes material to be broken under lower macro-stress, reduces the bending strength of material.It is regenerated after Ball-milling Time increase
The porosity of YG8-R reduces, and consistency improves, this is also beneficial to the raising of secondary alloy bending strength.The addition of micro Y2O3
The reduction of purification and alloy porosity to impurity element is the main reason for regeneration YG8-R alloy property improves.
Case study on implementation 6:
The bending resistance fracture of regeneration YG8 obviously belongs to brittle fracture, and fracture mode is grain boundary fracture, and the fracture of entire sample is in WC
Mutually with occurring on the interface of Co phase, having no WC particle splitting the case where, fracture origin are a small amount of macrovoid, hole and minority
Coarse WC grain, part greatly pore-size reach 113 μm, and the coarse WC grain size in part reaches 165 μm.Regenerate YG8-R
Bending resistance fracture apperance and regeneration YG8 are significantly different, and fractograph surface is more round and smooth, and transgranular fracture feature is shown, part
WC grain cleaves, and fracture mode is grain boundary fracture and transgranular fracture.Other than its fracture origin is in addition to the hole, hole the defects of, also
There is the loose Y2O3 segregation region in part, this is because Ball-milling Time is shorter, it is molten that Y2O3 is distributed in zinc with being difficult to even dispersion
In material, more Y2O3 segregation region is formd in the secondary alloy of preparation.
Case study on implementation 7:
After adding Y2O3 in secondary alloy, the microscopic structure of secondary alloy makes moderate progress, and transgranular fracture spy occurs in fracture surface
Sign, the bending strength of secondary alloy should be significantly improved, but due to foring more Y2O3 segregation region in secondary alloy,
Become new fracture origin under external force, affects the raising of secondary alloy comprehensive performance.
Claims (4)
1. a kind of regeneration WC-8Co hard alloy containing Y2O3 prepare raw material include: using zinc melt method recycling WC-Co it is compound
Powder.
2. the regeneration WC-8Co hard alloy according to claim 1 containing Y2O3, it is characterized in that the regeneration WC- containing Y2O3
The preparation step of 8Co hard alloy are as follows: starting powder is weighed, ingredient by experimental design, it is carried out after preparing
Wet-milling, ball-milling medium are the hexane of dosage 170mL/kg, and ratio of grinding media to material 7:1, Ball-milling Time is for 24 hours, after ball milling, to uninstall
Wet-milling material in pellet, then proceedes to ball milling for 24 hours, and ball milling terminates to receive again, and all pellets obtained are dried in vacuo, and does
The dry time is 75min, and drying temperature is 80 DEG C, is subsequently placed into press machine and carries out compression moulding, and pressing pressure 180MPa will
The green compact made, which is put into vacuum sintering furnace, to be sintered, and sintering temperature is 1450 DEG C, soaking time 90min.
3. the regeneration WC-8Co hard alloy according to claim 1 containing Y2O3, it is characterized in that the regeneration WC- containing Y2O3
The detecting step of 8Co hard alloy are as follows: the mode randomly selected is taken in the detection of sample, extracts in the sample that every group prepares
10 are detected, its microstructure density, hardness and bending strength is predominantly detected, and microstructure analysis is swept using TM3030
Electronic Speculum is retouched, density is measured using Archimedes principle, and hardness is measured using Rockwell apparatus, and bending strength is tried using three-point bending
Test method.
4. the regeneration WC-8Co hard alloy according to claim 1 containing Y2O3, it is characterized in that it is described containing Y2O3 again
Raw WC-8Co hard alloy, the addition of Y2O3 can significantly improve the hardness and bending strength of hard alloy, be able to ascend hard
The mechanism of matter alloy mechanical property be can inhibit during the sintering process crystal grain grow up and misgrowth, the addition of Y2O3 can make
The bending strength of YG8 hard alloy has been increased to 2120MPa from 1780MPa, and the regeneration WC-8Co hard containing Y2O3 closes
Gold, the flouring technology of ball milling can be such that raw material powder uniformly mixes twice, so that obtained hard alloy has higher cause
Density, thus possess higher hardness and bending strength, so, in the actual production process, need to increase the work of ball powder-grinding
The skill time improves the mechanical property of hard alloy, the regeneration WC-8Co hard alloy containing Y2O3, hard alloy
Internal seldom discovery hole and the king-sized WC grain of grain size, the fracture toughness of hard alloy are also significantly enhanced.
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| CN201710949330.9A CN109652727A (en) | 2017-10-12 | 2017-10-12 | A kind of regeneration WC-8Co hard alloy containing Y2O3 |
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| CN201710949330.9A CN109652727A (en) | 2017-10-12 | 2017-10-12 | A kind of regeneration WC-8Co hard alloy containing Y2O3 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114752801A (en) * | 2022-05-12 | 2022-07-15 | 崇义章源钨业股份有限公司 | Plate-shaped crystal reinforced net-shaped structure hard alloy and preparation method thereof |
-
2017
- 2017-10-12 CN CN201710949330.9A patent/CN109652727A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114752801A (en) * | 2022-05-12 | 2022-07-15 | 崇义章源钨业股份有限公司 | Plate-shaped crystal reinforced net-shaped structure hard alloy and preparation method thereof |
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