CN104746001A - Method for boronization surface treatment of workpieces - Google Patents
Method for boronization surface treatment of workpieces Download PDFInfo
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- CN104746001A CN104746001A CN201510131224.0A CN201510131224A CN104746001A CN 104746001 A CN104746001 A CN 104746001A CN 201510131224 A CN201510131224 A CN 201510131224A CN 104746001 A CN104746001 A CN 104746001A
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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
- C23C8/68—Boronising
- C23C8/70—Boronising of ferrous surfaces
Abstract
The invention discloses a method for boronization surface treatment of workpieces. The method comprises the following steps: preparation of boronization powder, preparation of boronization paste, coating of the boronization paste, preparation of protection paste, coating of the protection paste and boronization treatment, wherein the boronization powder is prepared by mixing 5-7 or 9-20 mass percent of B4C powder, KBF4 powder, carbon powder and SiC powder, and the boronization paste is prepared by mixing 2 mass percent of sodium carboxymethylcellulose aqueous solution and the boronization powder according to the mass ratio of 1:5. The method for boronization surface treatment of workpieces has the advantages that the method is simple compared with the powder boronizationmethod, achieves partial boronization, and has high boronization efficiency and thick boronization layers; boronization reaction can be performed under standard atmosphere pressure without protection gas and boxed sealing, the protection layer has good fluidity and good sealing, the boron consumption is less, the cost is low, and the washing is easy.
Description
Technical field
The present invention relates to a kind of surface treatment method, be specifically related to a kind of surface treatment method workpiece being carried out to boronising.
Background technology
Boronising makes steel surface have very high hardness and wear resistance, erosion resistance, oxidation-resistance and red hardness also comparatively before technique had obvious enhancing, the requirement of higher service condition can be met compared with conventional nitriding, carburizing.
Boride layer is primarily of Fe
2b, FeB two-phase is formed, and can be divided into Fe
2the single-phase boride layer of B, FeB-Fe2B two-phase boride layer.Single-phase boride layer comparatively two-phase boride layer hardness is low, and wear resistance is slightly poor; Two-phase boride layer hardness is higher, and wear resistance is better, but FeB compares crisp, simultaneously Fe
2the physical properties of B, FeB differs greatly and junction is easily cracked.The method complex procedures of existing boronising, higher to environmental requirement, add the difficulty that these methods are applied in the industrial production.
Summary of the invention
The surface treatment method carrying out boronising to workpiece provided by the invention has and can realize in normal atmospheric environment and advantage that single two-phase infiltration layer is controlled.
The present invention adopts following technical scheme:
Workpiece is carried out to a surface treatment method for boronising, comprising:
(1) preparation of boronising powder: according to massfraction, by the B of 5-7%
4the KBF of C powder, 3-5%
4the carbon dust of powder, 5-8%, the SiC powder of 70-85% are mixed into boronising powder;
(2) preparation of boronising lotion: the sodium carboxymethyl cellulose solution of massfraction 2% and boronising powder are mixed and made into boronising lotion according to mass ratio 1:5;
(3) coating of boronising lotion: surface boronising lotion being coated to pending workpiece, at a first temperature dry first Preset Time;
(4) preparation of lotion is protected: according to massfraction, by the Na of 90%
2siO
39H2O and 10% boric acid mix and are heated to be protection cream premixed liquid; According to mass ratio, silica powder and clay are mixed into 1:6 and protect cream pre-mix powder; Cream premixed liquid and protection cream pre-mix powder will be protected to mix with mass ratio 1:2 and stir as protecting lotion;
(5) coating of lotion is protected: the outside surface of the carburizing lotion be coated to outside pending workpiece by protection lotion makes protection lotion cover completely carburizing lotion;
(6) Bononizing pretreatment: by applying the pending workpiece of protection lotion and carburizing lotion as in heating unit, dry second Preset Time at the second temperature, be incubated the 3rd Preset Time at the 3rd temperature;
Wherein, the first temperature and the second temperature are all less than the 3rd temperature, and the first Preset Time is less than the second Preset Time, and the second Preset Time is less than the 3rd Preset Time.
Aforesaidly carry out in the surface treatment method of boronising to workpiece, the first temperature is less than or equal to 250 DEG C, and the first Preset Time is more than or equal to 5 minutes and is less than or equal to 10 minutes.
Aforesaidly carry out in the surface treatment method of boronising to workpiece, the second temperature is less than or equal to 350 DEG C, and the first Preset Time is more than or equal to 15 minutes and is less than or equal to 30 minutes.
Aforesaidly carry out in the surface treatment method of boronising to workpiece, the 3rd temperature span 850-950 DEG C, the 3rd Preset Time span is 3-6 hour.
Aforesaidly carry out in the surface treatment method of boronising to workpiece, at least step (6) Bononizing pretreatment completes under 0.5 ~ 1.5 × 105Pa air pressure environment.
Another kind of surface treatment method workpiece being carried out to boronising, comprising:
(1) preparation of boronising powder: according to massfraction, by the B of 9-20%
4the KBF of C powder, 5-20%
4the carbon dust of powder, 5-10%, the SiC powder of 50-70% are mixed into boronising powder;
(2) preparation of boronising lotion: the sodium carboxymethyl cellulose solution of massfraction 2% and boronising powder are mixed and made into boronising lotion according to mass ratio 1:5;
(3) coating of boronising lotion: surface boronising lotion being coated to pending workpiece, at a first temperature dry first Preset Time;
(4) preparation of lotion is protected: according to massfraction, by the Na of 90%
2siO
39H2O and 10% boric acid mix and are heated to be protection cream premixed liquid; According to mass ratio, silica powder and clay are mixed into 1:6 and protect cream pre-mix powder; Cream premixed liquid and protection cream pre-mix powder will be protected to mix with mass ratio 1:2 and stir as protecting lotion;
(5) coating of lotion is protected: the outside surface of the carburizing lotion be coated to outside pending workpiece by protection lotion makes protection lotion cover completely carburizing lotion;
(6) Bononizing pretreatment: by applying the pending workpiece of protection lotion and carburizing lotion as in heating unit, dry second Preset Time at the second temperature, be incubated the 3rd Preset Time at the 3rd temperature;
Wherein, the first temperature and the second temperature are all less than the 3rd temperature, and the first Preset Time is less than the second Preset Time, and the second Preset Time is less than the 3rd Preset Time.
Aforesaidly carry out in the surface treatment method of boronising to workpiece, the first temperature is less than or equal to 250 DEG C, and the first Preset Time is more than or equal to 10 minutes and is less than or equal to 20 minutes.
Aforesaidly carry out in the surface treatment method of boronising to workpiece, the first temperature is less than or equal to 250 DEG C, and the first Preset Time is more than or equal to 5 minutes and is less than or equal to 10 minutes.
Aforesaidly carry out in the surface treatment method of boronising to workpiece, the second temperature is less than or equal to 350 DEG C, and the first Preset Time is more than or equal to 15 minutes and is less than or equal to 30 minutes.
Aforesaidly carry out in the surface treatment method of boronising to workpiece, at least step (6) Bononizing pretreatment completes under 0.5 ~ 1.5 × 105Pa air pressure environment.
Usefulness of the present invention is:
1) when the workpiece boronising to mild steel material, have and obtain Fe respectively
2the controllability of the single-phase boride layer of B, FeB-Fe2B two-phase boride layer.
2) simple to operate compared with powder boriding method, can realize local boronising, boronising efficiency is high, boronising thickness;
3) can carry out boronising reaction at normal atmospheric pressure, without the need to shielding gas, vanning sealing etc., protective layer mobility, good airproof performance, the few cost of boron consumption is low, and cleaning easily.
Accompanying drawing explanation
Fig. 1 is the Fe that the embodiment of the present invention 1 obtains
2b single-phase boride layer microstructure picture.
Fig. 2 is the Fe that the embodiment of the present invention 2 obtains
2b single-phase boride layer microstructure picture.
Fig. 3 is the FeB-Fe that the embodiment of the present invention 3 obtains
2b two-phase boride layer microstructure picture.
Fig. 4 is the Fe that the embodiment of the present invention 4 obtains
2b single-phase boride layer microstructure picture.
Fig. 5 is the FeB-Fe that the embodiment of the present invention 5 obtains
2b two-phase boride layer microstructure picture.
Fig. 6 is the FeB-Fe that the embodiment of the present invention 6 obtains
2b two-phase boride layer microstructure picture.
Embodiment
The surface treatment method carrying out boronising to workpiece of the present invention mainly comprises the steps: the preparation of boronising powder, the preparation of boronising lotion, the coating of boronising lotion, the preparation of protection lotion, the coating of protection lotion, Bononizing pretreatment.
Wherein, the preparation of boronising powder can adopt according to the needs of required boride layer the scheme that the following two kinds is different.
If need Fe
2the single-phase boride layer of B, then according to massfraction, by the B of 5-7%
4the KBF of C powder, 3-5%
4the carbon dust of powder, 5-8%, the SiC powder of 70-85% are mixed into boronising powder.
If need FeB-Fe2B two-phase boride layer, then according to massfraction, by the B of 9-20%
4the KBF of C powder, 5-20%
4the carbon dust of powder, 5-10%, the SiC powder of 50-70% are mixed into boronising powder.
The workpiece be made up of medium carbon steel that the present invention is suitable for, more specifically, it is suitable for the trade mark is that 40Cr(composition is in table 1) the workpiece made of steel.
The chemical composition (quality %) of table 1 40Cr steel
| C | Si | Mn | Cr | Ni | Mo | Cu | P | S |
| 0.43 | 0.20 | 0.63 | 0.93 | 0.05 | 0.01 | 0.05 | 0.0112 | 0.011 |
When carrying out Bononizing pretreatment to workpiece, in order to obtain good boronising effect, needing rusty stain and the greasy dirt of removing workpiece surface, adopting sand papering, and with stand-by after alcohol washes, oven dry.
When actual treatment, can analyze the Working environment of workpiece, the load as born is comparatively large, then need to avoid fragility, select Fe
2the single-phase boride layer of B; As needed high wear resistance, then need that there is higher hardness, select FeB-Fe2B two-phase boride layer.Boronising powder needed for weighing according to concrete ratio, be modulated into paste, be coated in and treat boronising workpiece surface, thickness is 5-10mm, to be placed in SX2-4-10 type chamber type electric resistance furnace dry 5-10 minute at 150-250 DEG C.Complete the step of the preparation of boronising powder, the preparation of boronising lotion, the coating of boronising lotion.Wherein, carbon dust can adopt activity charcoal powder.
Next, carry out protecting the preparation of lotion and the coating of protection lotion: taking massfraction is 90%Na
2siO
39H
2after O and the mixing of 10% boric acid, be placed in HHS1 type electric-heated thermostatic water bath and be heated to 80 DEG C of insulations and be melted into liquid in 5 minutes.By purity be 95% silica powder mix with mass ratio 1:6 with clay.Aforesaid liquid is mixed with the ratio of mixed powder according to mass ratio 1:2, uses stirrer (200 revs/min) to stir and become paste in 2 minutes, be modulated into paste protective layer and boronizing paste and whole workpiece are wrapped up.
Subsequently carry out Bononizing pretreatment: coated workpiece is placed in SX2-4-10 type chamber type electric resistance furnace, dry 15-30 minute at 250-350 DEG C.Again SX2-4-10 type chamber type electric resistance furnace is warming up to 850-950 DEG C, is incubated after 3-6 hour, take out air cooling.
Then, protective layer is broken into pieces, take out workpiece, use cotton yarn clean surface.
Below enumerate specific embodiment to be specifically described:
Embodiment 1: carry out boronising to 40Cr, obtains Fe
2the single-phase boride layer of B.Boron-containing compound chooses B
4c, fluorochemical chooses KBF
4, dispersion agent chooses gac, and weighting agent is SiC.Concrete implementation step is as follows:
Step 1, pre-treatment is oozed to 40Cr matrix surface, specifically comprise: matrix surface deoils and derusts, smooth with sand papering, stand-by by alcohol washes post-drying;
Step 2, for obtain single-phase boride layer, be 5%B according to massfraction
4c, 5%KBF
4, 5% gac, 85%SiC proportioning take appropriate powder, after mixing, evenly, granularity is all greater than 200 orders in grinding.Configuration quality mark is the sodium carboxymethyl cellulose solution of 2%, mix with mass ratio 1:5 with penetration enhancer powder, use stirrer (200 revs/min) to stir and become paste in 2 minutes, coating paste thickness is 10mm, is placed in SX2-4-10 molding box formula heating device of electric resistance furnace and rises to 250 DEG C of dryings 10 minutes;
Step 3, to take massfraction be 90%Na
2siO
39H
2o, 10% boric acid mixing, be placed in HHS1 type electric-heated thermostatic water bath and be heated to 80 DEG C of insulations and be melted into liquid in 5 minutes.By purity be 95% silica powder mix with mass ratio 1:6 with clay.
Step 4, aforesaid liquid to be mixed according to mass ratio 1:2 with mixed powder, use stirrer (200 revs/min) to stir and be modulated into paste protective layer in 2 minutes, boronizing paste and whole workpiece are wrapped up, highly 10mm.Be placed in chamber type electric resistance furnace at 250 DEG C dry 20 minutes;
Step 5, chamber type electric resistance furnace is warming up to 880 DEG C, after insulation 4h, takes out air cooling.
Step 6, protective layer to be broken into pieces, take out matrix, use cotton yarn clean surface.
After using 4% nital corrosion, detect the situation such as borided layer depth, composition.Through verification experimental verification, be 5%B by massfraction
4c, 5%KBF
4, 5% gac, 85%SiC proportioning make paste can obtain Fe
2the single-phase boride layer of B, its microstructure as shown in Figure 1, does not produce obvious dual phase region, and THE STRUCTURES OF BORONISING is fine and close, and do not occur open defect, borided layer depth is 64.5 μm, and peak value of hardness is 1510HV.
Embodiment 2: carry out boronising to 40Cr, for obtaining Fe
2the single-phase boride layer of B, concrete implementation step is as follows:
Step 1, pre-treatment is oozed to 40Cr matrix surface, specifically comprise: matrix surface deoils and derusts, smooth with sand papering, stand-by by alcohol washes post-drying;
Step 2, for obtain single-phase boride layer, be 7%B according to massfraction
4c, 5%KBF
4, 5% gac, 83%SiC proportioning take appropriate powder, after mixing, evenly, granularity is all greater than 200 orders in grinding.Configuration quality mark is the sodium carboxymethyl cellulose solution of 2%, mix with mass ratio 1:5 with penetration enhancer powder, use stirrer (200 revs/min) to stir and become paste in 2 minutes, coating paste thickness is 10mm, is placed in SX2-4-10 molding box formula heating device of electric resistance furnace and rises to 250 DEG C of dryings 10 minutes;
Step 3, to take massfraction be 90%Na
2siO
39H
2o, 10% boric acid mixing, be placed in HHS1 type electric-heated thermostatic water bath and be heated to 80 DEG C of insulations and be melted into liquid in 5 minutes.By purity be 95% silica powder mix with mass ratio 1:6 with clay.
Step 4, aforesaid liquid to be mixed according to mass ratio 1:2 with mixed powder, use stirrer (200 revs/min) to stir and be modulated into paste protective layer in 2 minutes, boronizing paste and whole workpiece are wrapped up, highly 10mm.Be placed in chamber type electric resistance furnace at 250 DEG C dry 20 minutes;
Step 5, chamber type electric resistance furnace is warming up to 880 DEG C, after insulation 4h, takes out air cooling.
Step 6, protective layer to be broken into pieces, take out matrix, use cotton yarn clean surface.
After using nital corrosion, detect the situation such as borided layer depth, composition.Through verification experimental verification, by 7%B
4c, 5%KBF
4, 5% gac, 83%SiC proportioning make paste also can obtain Fe
2the single-phase boride layer of B, its microstructure as shown in Figure 2, does not produce obvious dual phase region, and THE STRUCTURES OF BORONISING is fine and close, and do not occur open defect, borided layer depth is 85.5 μm, and peak value of hardness is 1620HV.Increase compared with the borided layer depth in embodiment 1, peak value of hardness increases.
Whether embodiment 3: carry out boronising to 40Cr, during for verifying the boron supplying agent more than 7%, obtain Fe
2the single-phase boride layer of B, concrete implementation step is as follows:
Step 1, pre-treatment is oozed to 40Cr matrix surface, specifically comprise: matrix surface deoils and derusts, smooth with sand papering, stand-by by alcohol washes post-drying;
Step 2, for obtain single-phase boride layer, be 9%B according to massfraction
4c, 5%KBF
4, 5% gac, 81%SiC proportioning take appropriate powder, after mixing, evenly, granularity is all greater than 200 orders in grinding.Configuration quality mark is the sodium carboxymethyl cellulose solution of 2%, mix with mass ratio 1:5 with penetration enhancer powder, use stirrer (200 revs/min) to stir and become paste in 2 minutes, coating paste thickness is 10mm, is placed in SX2-4-10 molding box formula heating device of electric resistance furnace and rises to 250 DEG C of dryings 10 minutes;
Step 3, to take massfraction be 90%Na
2siO
39H
2o, 10% boric acid mixing, be placed in HHS1 type electric-heated thermostatic water bath and be heated to 80 DEG C of insulations and be melted into liquid in 5 minutes.Be silica powder and the clay (main component: SiO of 95% by purity
2for 43-55%, Fe
2o
3for 1-3.5%, Al
2o
3for 20-25%, TiO
2for the K of 0.8-1.2% and trace
2o, Na
2o, CaO etc.) mix with mass ratio 1:6.
Step 4, aforesaid liquid to be mixed according to mass ratio 1:2 with mixed powder, use stirrer (200 revs/min) to stir and be modulated into paste protective layer in 2 minutes, boronizing paste and whole workpiece are wrapped up, highly 10mm.Be placed in chamber type electric resistance furnace at 250 DEG C dry 20 minutes;
Step 5, chamber type electric resistance furnace is warming up to 880 DEG C, after insulation 4h, takes out air cooling.
Step 6, protective layer to be broken into pieces, take out matrix, use cotton yarn clean surface.
After using nital corrosion, detect the situation such as borided layer depth, composition.Through verification experimental verification, by 9%B
4c, 5%KBF
4, 5% gac, 81%SiC proportioning make paste obtain FeB-Fe
2b two-phase boride layer, as shown in Figure 3, enter surface and produce obviously darker tooth peak, be FeB region, distribute scattered, THE STRUCTURES OF BORONISING is fine and close, and do not occur open defect, borided layer depth is 106 μm, and peak value of hardness is 1790HV for its microstructure.Work as B as seen
4c content can produce obvious FeB phase when being increased to 9%.In order to obtain Fe
2the single-phase boride layer of B, avoids the trend generating FeB, should adopt the B of 5%-7%
4c is advisable.
Embodiment 4: boronising is carried out to 40Cr, for checking lower than 5% time obtain Fe
2whether the single-phase boride layer of B has use value, and concrete implementation step is as follows:
Step 1, pre-treatment is oozed to 40Cr matrix surface, specifically comprise: matrix surface deoils and derusts, smooth with sand papering, stand-by by alcohol washes post-drying;
Step 2, for obtain single-phase boride layer, be 3%B according to massfraction
4c, 5%KBF
4, 5% gac, 87%SiC proportioning take appropriate powder, after mixing, evenly, granularity is all greater than 200 orders in grinding.Configuration quality mark is the sodium carboxymethyl cellulose solution of 2%, mix with mass ratio 1:5 with penetration enhancer powder, use stirrer (200 revs/min) to stir and become paste in 2 minutes, coating paste thickness is 10mm, is placed in SX2-4-10 molding box formula heating device of electric resistance furnace and rises to 250 DEG C of dryings 10 minutes;
Step 3, to take massfraction be 90%Na
2siO
39H
2o, 10% boric acid mixing, be placed in HHS1 type electric-heated thermostatic water bath and be heated to 80 DEG C of insulations and be melted into liquid in 5 minutes.By purity be 95% silica powder mix with mass ratio 1:6 with clay.
Step 4, aforesaid liquid to be mixed according to mass ratio 1:2 with mixed powder, use stirrer (200 revs/min) to stir and be modulated into paste protective layer in 2 minutes, boronizing paste and whole workpiece are wrapped up, highly 10mm.Be placed in chamber type electric resistance furnace at 250 DEG C dry 20 minutes;
Step 5, chamber type electric resistance furnace is warming up to 880 DEG C, after insulation 4h, takes out air cooling.
Step 6, protective layer to be broken into pieces, take out matrix, use cotton yarn clean surface.
After using nital corrosion, detect the situation such as borided layer depth, composition.Through verification experimental verification, by 3%B
4c, 5%KBF
4, 5% gac, 87%SiC proportioning make paste can obtain Fe
2the single-phase boride layer of B, as shown in Figure 4, borided layer depth is less than 30 μm for its microstructure, thinner and unfairness, local location has infiltration layer vacancy, in use easy to wearly to matrix, infiltration layer entirety is peeled off, do not meet the use standard of single-phase boride layer, peak value of hardness is 1120HV.
With medium carbon steel 40Cr for matrix, for obtaining Fe
2b single-phase boride layer paste composition: the B of 5-7%
4the KBF of C, 3-5%
4, 5-8% dispersion agent gac, 70-85% weighting agent SiC.
The paste boron-doping method boronising provided according to this patent has following characteristics: 1, THE STRUCTURES OF BORONISING is fine and close: the wear resistance that greatly can improve medium carbon steel.2, boride layer composition is mutually controlled: can obtain Fe
2the single-phase boride layer of B, avoids the generation of two-phase boride layer.3, boriding rate is fast: 40Cr can obtain the boride layer of more than 100 μm at 880 DEG C of insulation 4h, and comparatively powder method speed is fast.4, easy cleaning: after reaction, penetration enhancer is particulate state, non-caked, is convenient to the cleaning of workpiece.
Whether embodiment 5: carry out boronising to 40Cr, for obtaining FeB-Fe when checking boron supplying agent is 20%
2b two-phase boride layer, concrete implementation step is as follows:
Step 1, pre-treatment is oozed to 40Cr matrix surface, specifically comprise: matrix surface deoils and derusts, smooth with sand papering, stand-by by alcohol washes post-drying;
Step 2, for obtain single-phase boride layer, be 20%B according to massfraction
4c, 20%KBF
4, 10% gac, 50%SiC proportioning take appropriate powder, after mixing, evenly, granularity is all greater than 200 orders in grinding.Configuration quality mark is the sodium carboxymethyl cellulose solution of 2%, mix with mass ratio 1:5 with penetration enhancer powder, use stirrer (200 revs/min) to stir and become paste in 2 minutes, coating paste thickness is 10mm, is placed in SX2-4-10 molding box formula heating device of electric resistance furnace and rises to 250 DEG C of dryings 10 minutes;
Step 3, to take massfraction be 90%Na
2siO
39H
2o, 10% boric acid mixing, be placed in HHS1 type electric-heated thermostatic water bath and be heated to 80 DEG C of insulations and be melted into liquid in 5 minutes.By purity be 95% silica powder mix with mass ratio 1:6 with clay.
Step 4, aforesaid liquid to be mixed according to mass ratio 1:2 with mixed powder, use stirrer (200 revs/min) to stir and be modulated into paste protective layer in 2 minutes, boronizing paste and whole workpiece are wrapped up, highly 10mm.Be placed in chamber type electric resistance furnace at 250 DEG C dry 20 minutes;
Step 5, chamber type electric resistance furnace is warming up to 880 DEG C, after insulation 4h, takes out air cooling.
Step 6, protective layer to be broken into pieces, take out matrix, use cotton yarn clean surface.
After using nital corrosion, detect the situation such as borided layer depth, composition.Through verification experimental verification, by 20%B
4c, 20%KBF
4, the paste that makes of 10% gac, 55%SiC proportioning can obtain two-phase boride layer, as shown in Figure 5, the maximum hardness of boron supplying agent is 1907HV to its microstructure, and borided layer depth is 134.1 μm, and diffusion layer organization is good, and dual phase region is obvious.
Embodiment 6: boronising is carried out to 40Cr, for checking higher than 25% time obtain FeB-Fe
2whether B two-phase borided layer depth has the space of lifting, and concrete implementation step is as follows:
Step 1, pre-treatment is oozed to 40Cr matrix surface, specifically comprise: matrix surface deoils and derusts, smooth with sand papering, stand-by by alcohol washes post-drying;
Step 2, for obtain single-phase boride layer, be 25%B according to massfraction
4c, 20%KBF
4, 10% gac, 45%SiC proportioning take appropriate powder, after mixing, evenly, granularity is all greater than 200 orders in grinding.Configuration quality mark is the sodium carboxymethyl cellulose solution of 2%, mix with mass ratio 1:5 with penetration enhancer powder, use stirrer (200 revs/min) to stir and become paste in 2 minutes, coating paste thickness is 10mm, is placed in SX2-4-10 molding box formula heating device of electric resistance furnace and rises to 250 DEG C of dryings 10 minutes;
Step 3, to take massfraction be 90%Na
2siO
39H
2o, 10% boric acid mixing, be placed in HHS1 type electric-heated thermostatic water bath and be heated to 80 DEG C of insulations and be melted into liquid in 5 minutes.By purity be 95% silica powder mix with mass ratio 1:6 with clay.
Step 4, aforesaid liquid to be mixed according to mass ratio 1:2 with mixed powder, use stirrer (200 revs/min) to stir and be modulated into paste protective layer in 2 minutes, boronizing paste and whole workpiece are wrapped up, highly 10mm.Be placed in chamber type electric resistance furnace at 250 DEG C dry 20 minutes;
Step 5, chamber type electric resistance furnace is warming up to 880 DEG C, after insulation 4h, takes out air cooling.
Step 6, protective layer to be broken into pieces, take out matrix, use cotton yarn clean surface.
After using nital corrosion, detect the situation such as borided layer depth, composition.Through verification experimental verification, by 25%B
4c, 20%KBF
4, the paste that makes of 10% gac, 45%SiC proportioning can obtain two-phase boride layer, as shown in Figure 6, maximum hardness is 2331HV to its microstructure, and borided layer depth is 140.1 μm, and diffusion layer organization is good, and dual phase region is obvious.
Comparative example 5,6 can find, embodiment 6 borided layer depth increases not obvious compared with embodiment 5, and cost improves more, is therefore unfavorable for production application.Therefore for obtaining FeB-Fe
2b two-phase boride layer, taking massfraction proportioning is 9-20% boron source B
4c, 5-20% promoting agent KBF
4, 5-10% dispersion agent gac, 50-70% weighting agent SiC(200 order) be most preferably scheme.
With medium carbon steel 40Cr for matrix, for obtaining Fe
2b single-phase boride layer paste composition quality mark proportioning is the B of 5-7%
4the KBF of C, 3-5%
4, 5-8% dispersion agent gac, 70-85% weighting agent SiC; For obtaining FeB-Fe
2b two-phase boride layer, taking massfraction proportioning is 9-20% boron source B
4c, 5-20% promoting agent KBF
4, 5-10% dispersion agent gac, 50-70% weighting agent SiC(200 order).
The paste boron-doping method boronising provided according to this patent has following characteristics: 1, THE STRUCTURES OF BORONISING is fine and close: the wear resistance that greatly can improve medium carbon steel.2, boride layer composition is mutually controlled, selects suitable boride layer: can obtain Fe according to industrial requirement
2the single-phase boride layer of B, FeB-Fe
2b two-phase boride layer.3, boriding rate is fast: 40Cr can obtain the boride layer of more than 100 μm at 880 DEG C of insulation 4h, and comparatively powder method speed is fast.4, easy cleaning: after reaction, penetration enhancer is particulate state, non-caked, is convenient to the cleaning of workpiece.
Claims (10)
1. workpiece is carried out to a surface treatment method for boronising, it is characterized in that, comprising:
(1) preparation of boronising powder: according to massfraction, by the B of 5-7%
4the KBF of C powder, 3-5%
4the carbon dust of powder, 5-8%, the SiC powder of 70-85% are mixed into boronising powder;
(2) preparation of boronising lotion: the sodium carboxymethyl cellulose solution of massfraction 2% and described boronising powder are mixed and made into described boronising lotion according to mass ratio 1:5;
(3) coating of boronising lotion: surface boronising lotion being coated to pending workpiece, at a first temperature dry first Preset Time;
(4) preparation of lotion is protected: according to massfraction, by the Na of 90%
2siO
39H2O and 10% boric acid mix and are heated to be protection cream premixed liquid; According to mass ratio, silica powder and clay are mixed into 1:6 and protect cream pre-mix powder; Described protection cream premixed liquid and described protection cream pre-mix powder are mixed with mass ratio 1:2 and stirs as protecting lotion;
(5) coating of lotion is protected: the outside surface of the carburizing lotion be coated to outside pending workpiece by described protection lotion makes described protection lotion cover completely described carburizing lotion;
(6) Bononizing pretreatment: by applying the pending workpiece of good described protection lotion and described carburizing lotion as in heating unit, dry second Preset Time at the second temperature, be incubated the 3rd Preset Time at the 3rd temperature;
Wherein, described first temperature and described second temperature are all less than the 3rd temperature, and described first Preset Time is less than described second Preset Time, and described second Preset Time is less than described 3rd Preset Time.
2. surface treatment method workpiece being carried out to boronising according to claim 1, is characterized in that, described first temperature is less than or equal to 250 DEG C, and described first Preset Time is more than or equal to 5 minutes and is less than or equal to 10 minutes.
3. surface treatment method workpiece being carried out to boronising according to claim 1, is characterized in that, described second temperature is less than or equal to 350 DEG C, and described first Preset Time is more than or equal to 15 minutes and is less than or equal to 30 minutes.
4. surface treatment method workpiece being carried out to boronising according to claim 1, is characterized in that, described 3rd temperature span 850-950 DEG C, and described 3rd Preset Time span is 3-6 hour.
5. surface treatment method workpiece being carried out to boronising according to claim 1, is characterized in that, at least described Bononizing pretreatment is 0.5 ~ 1.5 × 10
5complete under Pa air pressure environment.
6. workpiece is carried out to a surface treatment method for boronising, it is characterized in that, comprising:
(1) preparation of boronising powder: according to massfraction, by the B of 9-20%
4the KBF of C powder, 5-20%
4the carbon dust of powder, 5-10%, the SiC powder of 50-70% are mixed into boronising powder;
(2) preparation of boronising lotion: the sodium carboxymethyl cellulose solution of massfraction 2% and described boronising powder are mixed and made into described boronising lotion according to mass ratio 1:5;
(3) coating of boronising lotion: surface boronising lotion being coated to pending workpiece, at a first temperature dry first Preset Time;
(4) preparation of lotion is protected: according to massfraction, by the Na of 90%
2siO
39H2O and 10% boric acid mix and are heated to be protection cream premixed liquid; According to mass ratio, silica powder and clay are mixed into 1:6 and protect cream pre-mix powder; Described protection cream premixed liquid and described protection cream pre-mix powder are mixed with mass ratio 1:2 and stirs as protecting lotion;
(5) coating of lotion is protected: the outside surface of the carburizing lotion be coated to outside pending workpiece by described protection lotion makes described protection lotion cover completely described carburizing lotion;
(6) Bononizing pretreatment: by applying the pending workpiece of good described protection lotion and described carburizing lotion as in heating unit, dry second Preset Time at the second temperature, be incubated the 3rd Preset Time at the 3rd temperature;
Wherein, described first temperature and described second temperature are all less than the 3rd temperature, and described first Preset Time is less than described second Preset Time, and described second Preset Time is less than described 3rd Preset Time.
7. surface treatment method workpiece being carried out to boronising according to claim 6, is characterized in that, described first temperature is less than or equal to 250 DEG C, and described first Preset Time is more than or equal to 5 minutes and is less than or equal to 10 minutes.
8. surface treatment method workpiece being carried out to boronising according to claim 6, is characterized in that, described second temperature is less than or equal to 350 DEG C, and described first Preset Time is more than or equal to 15 minutes and is less than or equal to 30 minutes.
9. surface treatment method workpiece being carried out to boronising according to claim 6, is characterized in that, described 3rd temperature span 850-950 DEG C, and described 3rd Preset Time span is 3-6 hour.
10. surface treatment method workpiece being carried out to boronising according to claim 6, is characterized in that, at least described Bononizing pretreatment is 0.5 ~ 1.5 × 10
5complete under Pa air pressure environment.
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| CN109023226A (en) * | 2018-07-24 | 2018-12-18 | 华南理工大学 | A kind of flexibility and prepares single-phase Fe at boron gesture pack boronizing medium2The method of B boride layer |
| CN114277235A (en) * | 2021-12-03 | 2022-04-05 | 山东大众机械制造股份有限公司 | Heat treatment method of high-strength anti-fatigue engine connecting rod |
| CN114703447A (en) * | 2022-04-01 | 2022-07-05 | 江苏科技大学 | One-phase Fe2Boronizing agent for B tissue and preparation method and application thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108277452A (en) * | 2017-01-06 | 2018-07-13 | 株式会社赤坂宝石 | The manufacturing method of platinum processed goods |
| CN108277452B (en) * | 2017-01-06 | 2021-10-01 | 株式会社赤坂宝石 | Method for producing platinum processed product |
| CN109023226A (en) * | 2018-07-24 | 2018-12-18 | 华南理工大学 | A kind of flexibility and prepares single-phase Fe at boron gesture pack boronizing medium2The method of B boride layer |
| CN109023226B (en) * | 2018-07-24 | 2020-09-22 | 华南理工大学 | Flexible boronizing solid boronizing agent and preparation of single-phase Fe2Method for B boronizing layers |
| CN114277235A (en) * | 2021-12-03 | 2022-04-05 | 山东大众机械制造股份有限公司 | Heat treatment method of high-strength anti-fatigue engine connecting rod |
| CN114703447A (en) * | 2022-04-01 | 2022-07-05 | 江苏科技大学 | One-phase Fe2Boronizing agent for B tissue and preparation method and application thereof |
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| CN104746001B (en) | 2017-06-27 |
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