CN109576637A - A kind of method for carburizing of hard alloy - Google Patents
A kind of method for carburizing of hard alloy Download PDFInfo
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- CN109576637A CN109576637A CN201811565659.6A CN201811565659A CN109576637A CN 109576637 A CN109576637 A CN 109576637A CN 201811565659 A CN201811565659 A CN 201811565659A CN 109576637 A CN109576637 A CN 109576637A
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- hard alloy
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- sintering
- sintering furnace
- carburizing
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/60—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes
- C23C8/62—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes only one element being applied
- C23C8/64—Carburising
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/241—Chemical after-treatment on the surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
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- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a kind of method for carburizing of hard alloy, belong to hard alloy manufacturing field, the present invention carries out carbusintering using dewaxing-sintering furnace or pressure sintering furnace substitution molybdenum filament hydrogen sintering furnace, the density of graphite particle is larger, it is not easy to be dispersed into during carbusintering inside burner hearth in even vacuum pipe, sintering furnace pipeline will not be damaged, will not be dispersed into air and pollute environment；The separation of graphite particle and hard alloy decarburization product is easy, it is not easy to is sticked to the surface of hard alloy, be improved production efficiency；Graphite boat is sealed using graphite cover board, graphite particle is further prevented to be dispersed into inside burner hearth in even vacuum pipe, and graphite cover board plays a crucial role to the carbon atmosphere of control carburizing process, effectively spout row Carburization Treatment to hard alloy decarburization product, by being passed through argon gas to dewaxing-sintering furnace or pressure sintering furnace, and certain pressure is controlled, realizes the elimination of hard alloy decarburization defect, process is short, and production cost is low.
Description
Technical field
The invention belongs to hard alloy manufacturing fields, and in particular to a kind of method for carburizing of hard alloy.
Background technique
Carbon content is to influence the key factor of Cemented Carbide Properties, micro carbon content fluctuation can cause alloy phase composition and
Microstructural variation, to influence the performance of alloy.When carbon content deficiency in alloy, easily there is decarburized structure phase, it is this
Phasic property is crisp and unstable, will lead to alloy strength decline；The graphite of free state to occur inside when carbon content is higher in alloy,
The presence of graphite destroys the continuity of alloy substrate, play the role of it is certain isolate, to the intensity, toughness and wearability of alloy
Deng having an adverse effect.
The mixture of hard alloy manufacturing process is prepared, mixes glue, pad burns the factors such as brush lid and the sintering of coating and can all influence
The control of hard alloy carbon content makes hard metal article occur to lack carbon and carburizing defect, and the product for lacking carbon and carburizing needs to lead to
Later continue carburizing and decarburization auxiliary process to mend carbon and carbon elimination.
The carburizing and decarburization of hard metal article are usually to be completed with molybdenum filament hydrogen sintering furnace, with manufacturing technology
Development, molybdenum filament hydrogen sintering furnace are generally eliminated.Currently, the method for carburizing of hard metal article generallys use stuffing process true
Carburizing is completed in empty furnace, when sintering process vacuumizes, the lesser graphite powder final states of density be will be distributed to inside burner hearth very
To vacuum pipe, and cause sintering furnace to damage, and will be distributed in air, pollutes environment；Meanwhile vacuum when sintering temperature
Under state, the carbon control climate of carburizing process is bad, and carburizing effect is not significant, increases the defect rate of hard alloy after carburizing.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of simple processes, hard alloy at low cost
Method for carburizing, can be prevented in dewaxing-sintering furnace or pressure sintering furnace using the graphite particle sealed as filler
Powdered graphite flies upward damage sintering furnace, meanwhile, certain atmosphere pressures are kept, can effectively be spouted row to hard alloy decarburization product
Carburization Treatment.
The present invention provides a kind of method for carburizing of hard alloy, comprising the following steps:
(1) it is uniformly laid with graphite particle in graphite boat, hard alloy decarburization product is filled into graphite particle, is adopted
Graphite boat is sealed with graphite cover board, hard alloy and graphite components after being assembled；
(2) hard alloy after assembling obtained by step (1) is put into dewaxing-sintering furnace with graphite components or pressure is burnt
Carry out carbusintering in freezing of a furnace, when carbusintering is directly warming up to sintering temperature and is kept the temperature, and sintering temperature is 1370~1410
DEG C, soaking time is 30~90min, and after heat preservation, room temperature is down in furnace cooling；
(3) after the completion of carbusintering, hard metal article, graphite particle circulation are taken out from the graphite particle of graphite boat
It uses, blasting treatment is carried out to hard metal article, the hard alloy after obtaining Carburization Treatment.
Preferably, the granularity of the graphite particle is 0.5~3.0mm of φ in step (1), graphite particle is by quality
The metallurgical grade graphite particle of percentages 100%.Carburizer uses graphite particle, has both sides effect: first is that graphite
The apparent density of grain is larger, is not easy to be dispersed into during carbusintering inside burner hearth in even vacuum pipe, therefore will not damage
Bad sintering furnace pipeline, will not be dispersed into air and pollute environment；Second is that the separation of graphite particle and hard alloy decarburization product
It is easy, it is not easy to be sticked to the surface of hard alloy, so as to save disengaging time, improve production efficiency.
Preferably, in step (2), when using dewaxing-sintering furnace, sintering process atmosphere are as follows: be true before sintering temperature
Air atmosphere after reaching sintering temperature, is filled with argon gas, in dewaxing-sintering furnace the absolute pressure of argon gas remain 50 ±
10mbar。
Preferably, in step (2), when using pressure sintering furnace, sintering process atmosphere are as follows: be vacuum gas before sintering temperature
Atmosphere after reaching sintering temperature, is filled with argon gas, the absolute pressure of argon gas remains 10~60bar in pressure sintering furnace.
Advantageous effects of the invention are as follows:
The present invention provides a kind of method for carburizing of hard alloy, substitutes molybdenum using dewaxing-sintering furnace or pressure sintering furnace
Silk hydrogen sintering furnace carries out carbusintering, close due to graphite particle using biggish graphite particle (0.5~3.0mm of φ)
It spends larger, is not easy during carbusintering to be dispersed into inside burner hearth in even vacuum pipe, therefore sintering boiler tube will not be damaged
Road will not be dispersed into air and pollute environment；And the separation of graphite particle and hard alloy decarburization product is easy, it is not easy to
It is sticked to the surface of hard alloy, so as to save disengaging time, improves production efficiency.
The present invention provides a kind of method for carburizing of hard alloy, seals graphite boat using graphite cover board, further prevents
Only graphite particle is dispersed into inside burner hearth in even vacuum pipe, and graphite cover board plays the carbon atmosphere of control carburizing process and closes
Key effect, effectively spouts row Carburization Treatment to hard alloy decarburization product, by dewaxing-sintering furnace or pressure sintering furnace
It is passed through argon gas, and controls certain pressure, carbon atmosphere is made to reach certain concentration, realizes disappearing for hard alloy decarburization defect
It removes, process is short, and production cost is low.
Detailed description of the invention
Fig. 1 is the process flow chart of the method for carburizing of hard alloy of the present invention.
Fig. 2 is the decarburization metallographic microscope for the hard alloy that embodiment 1 is chosen.
Fig. 3 is using 1 method of embodiment treated hard alloy metallographic microscope.
Fig. 4 is the decarburization metallographic microscope for the hard alloy that embodiment 2 is chosen.
Fig. 5 is using 2 method of embodiment treated hard alloy metallographic microscope.
Fig. 6 is the decarburization metallographic microscope for the hard alloy that embodiment 3 is chosen.
Fig. 7 is using 3 method of embodiment treated hard alloy metallographic microscope.
Fig. 8 is using 1 method of comparative example treated hard alloy metallographic microscope.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, rather than whole embodiments, based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The principle of the present invention are as follows: hard alloy decarburization product fills in metallurgical grade graphite particle, and in graphite boat
And in the sealed environment of graphite cover board, at a sintering temperature, graphite product generates carbon atmosphere in the boat space of sealing, in furnace
Sustainable in boat to retain carbon atmosphere under interior inert gas air pressure, carbon atmosphere continues to hard alloy decarburization product in boat
Internal penetration reaches carburizing effect；It can be prevented using the graphite boat of biggish graphite particle (0.5~3.0mm of φ) and sealing
Graphite particle is pumped when being sintered stove evacuation；According to the product trade mark, model, the difference of decarbonization degree, sintering temperature can adjust
Degree, soaking time and atmosphere pressures.
Invention is further explained with attached drawing combined with specific embodiments below:
Embodiment 1
Hard alloy decarburization product, parameter: trade mark YG8.2, size 320mm × 12mm × 4mm, metallographic microstructure have
The strip thin slice 196kg of decarburization η phase (E50), hard alloy metallographic microscope are shown in Fig. 2.
The present invention provides a kind of method for carburizing of hard alloy, comprising the following steps:
(1) every hard alloy decarburization product is placed in square graphite boat, with graphite particle (φ 0.5~
It 3.0mm) fills, and is covered with graphite cover plate for sealing, form the graphite boat space of sealing；
(2) graphite boat of sealing is put into dewaxing-sintering furnace and is directly warming up to sintering temperature under vacuum atmosphere
1410 DEG C, it is filled with argon gas at this time, argon pressure is maintained at 50 ± 10mbar, soaking time 30min, after heat preservation, with furnace
Cool down to room temperature；
(3) after the completion of carbusintering, hard metal article, graphite particle circulation are taken out from the graphite particle of graphite boat
It uses, blasting treatment is carried out to hard metal article, the hard alloy after obtaining Carburization Treatment.
Product after blasting treatment randomly select 2 and makees metallographic detection and analysis, analysis result metallographic microstructure without
Decarburization η phase, metallographic microstructure C class is C00, and specific metallographic microscope is shown in Fig. 3.
Embodiment 2
Hard alloy decarburization product, parameter: trade mark YG8, size φ 30mm × 20mm, metallographic microstructure have decarburization η
The cylindrical body of phase (E14) 24, hard alloy metallographic microscope is shown in Fig. 4.
The present invention provides a kind of method for carburizing of hard alloy, comprising the following steps:
(1) every hard alloy decarburization product is placed in circular graphitic boat, with graphite particle (φ 0.5~
It 3.0mm) fills, and is covered with graphite cover plate for sealing, form the graphite boat space of sealing；
(2) graphite boat of sealing is put into dewaxing-sintering furnace, other hart metal products of getting a lift are warming up to burning
1390 DEG C of junction temperature, it is filled with argon gas at this time, argon pressure is maintained at 50 ± 10mbar, soaking time 60min, and heat preservation terminates
Afterwards, room temperature is down in furnace cooling；
(3) after the completion of carbusintering, hard metal article, graphite particle circulation are taken out from the graphite particle of graphite boat
It uses, blasting treatment is carried out to hard metal article, the hard alloy after obtaining Carburization Treatment.
Product after blasting treatment randomly select 2 and makees metallographic detection and analysis, analysis result metallographic microstructure without
Decarburization η phase, metallographic microstructure C class is C00, and specific metallographic microscope is shown in Fig. 5.
Embodiment 3
Hard alloy decarburization product, parameter: trade mark YG8.2, sizeMetallographic is aobvious
Micro-group is woven with 30 products of decarburization η phase (E06), and hard alloy metallographic microscope is shown in Fig. 6.
The present invention provides a kind of method for carburizing of hard alloy, comprising the following steps:
(1) every hard alloy decarburization product is placed in square graphite boat, with graphite particle (φ 0.5~
It 3.0mm) fills, and is covered with graphite cover plate for sealing, form the graphite boat space of sealing；
(2) graphite boat of sealing is put into pressure sintering furnace under vacuum atmosphere and is directly warming up to sintering temperature 1370
DEG C, it is filled with argon gas at this time, argon pressure is maintained at 50bar, carry out pressure sintering, soaking time 90min, after heat preservation,
Room temperature is down in furnace cooling；
(3) after the completion of carbusintering, hard metal article, graphite particle circulation are taken out from the graphite particle of graphite boat
It uses, blasting treatment is carried out to hard metal article, the hard alloy after obtaining Carburization Treatment.
Product after blasting treatment randomly select 2 and makees metallographic detection and analysis, analysis result metallographic microstructure without
Decarburization η phase, metallographic microstructure C class is C00, and specific metallographic microscope is shown in Fig. 7.
Comparative example 1
Using the hard alloy decarburization product 30 in embodiment 3, Carburization Treatment is carried out to it, comprising:
(1) every hard alloy decarburization product is placed in square graphite boat, is filled with powdered graphite, and use graphite
Cover plate for sealing covering, forms the graphite boat space of sealing；
(2) graphite boat of sealing is put into vacuum sintering furnace under vacuum atmosphere and is directly warming up to sintering temperature 1450
DEG C, soaking time 120min, after heat preservation, room temperature is down in furnace cooling；
(3) after the completion of carbusintering, hard alloy decarburization product, graphite particle are taken out from the graphite particle of graphite boat
It is recycled, blasting treatment is carried out to hard alloy decarburization product, the hard alloy after obtaining Carburization Treatment.
Product after blasting treatment randomly select 2 and makees metallographic detection and analysis, analysis result metallographic microstructure according to
So there are decarburization η phases, and metallographic microstructure E class is E06, and specific metallographic microscope is shown in Fig. 8.
Claims (4)
1. a kind of method for carburizing of hard alloy, which comprises the following steps:
(1) it is uniformly laid with graphite particle in graphite boat, hard alloy decarburization product is filled into graphite particle, using stone
Inky cap plate seals graphite boat, hard alloy and graphite components after being assembled；
(2) hard alloy after assembling obtained by step (1) is put into dewaxing-sintering furnace or pressure sintering furnace with graphite components
Middle carry out carbusintering, when carbusintering, are directly warming up to sintering temperature and are kept the temperature, and sintering temperature is 1370~1410 DEG C, protect
The warm time is 30~90min, and after heat preservation, room temperature is down in furnace cooling；
(3) after the completion of carbusintering, hard metal article is taken out from the graphite particle of graphite boat, graphite particle circulation makes
With carrying out blasting treatment, hard alloy after obtaining Carburization Treatment to hard metal article.
2. the method for carburizing of hard alloy according to claim 1, which is characterized in that in step (1), the graphite particle
Granularity is 0.5~3.0mm of φ, the metallurgical grade graphite particle that graphite particle is by mass percentage 100%.
3. the method for carburizing of hard alloy according to claim 1, which is characterized in that in step (2), using dewaxing and sintering one
When body furnace, sintering process atmosphere are as follows: be vacuum atmosphere before sintering temperature, after reaching sintering temperature, be filled with argon gas, dewaxing and sintering one
The absolute pressure of argon gas remains 50 ± 10mbar in body furnace.
4. the method for carburizing of hard alloy according to claim 1, which is characterized in that in step (2), using pressure sintering furnace
When, sintering process atmosphere are as follows: be vacuum atmosphere before sintering temperature, after reaching sintering temperature, be filled with argon gas, argon in pressure sintering furnace
The absolute pressure of gas remains 10~60bar.
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| CN201811565659.6A CN109576637B (en) | 2018-12-20 | 2018-12-20 | Carburizing method for hard alloy |
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| CN201811565659.6A CN109576637B (en) | 2018-12-20 | 2018-12-20 | Carburizing method for hard alloy |
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| CN109576637B CN109576637B (en) | 2021-03-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115815597A (en) * | 2022-10-31 | 2023-03-21 | 成都美奢锐新材料有限公司 | Hard alloy burning-back device and hard alloy burning-back method |
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| CN115815597A (en) * | 2022-10-31 | 2023-03-21 | 成都美奢锐新材料有限公司 | Hard alloy burning-back device and hard alloy burning-back method |
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