CN107164718B - A kind of process of surface treatment reducing gasoline engine crank watt abrasion loss - Google Patents
A kind of process of surface treatment reducing gasoline engine crank watt abrasion loss Download PDFInfo
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- CN107164718B CN107164718B CN201710336611.7A CN201710336611A CN107164718B CN 107164718 B CN107164718 B CN 107164718B CN 201710336611 A CN201710336611 A CN 201710336611A CN 107164718 B CN107164718 B CN 107164718B
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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
- C23C8/06—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 gases
- C23C8/28—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 gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
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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
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
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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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
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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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
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Abstract
The invention proposes a kind of process of surface treatment for reducing gasoline engine crank watt abrasion loss, quenching, temper processing, nitrocarburizing and surface rare earth/aluminium oxide plating intensive treatment including double fragmentation, engine crankshaft bush finished product obtained has excellent Wear-resistant, high-temperature resistant, comprehensive mechanical performance is compared to improving 50% or more before untreated, hardness is less than 0.01mm up to 63HRC, abrasion loss.
Description
Technical field
The present invention relates to automobile parts processing technology fields, and in particular to a kind of table for reducing gasoline engine crank watt abrasion loss
Surface treatment technique.
Background technique
Engine crankshaft bush is exactly crankshaft bearing liner, is mounted in the mounting bracket of crankshaft and cylinder body, and the tile for playing the role of bearing is logical
Often it is called crankshaft bearing liner.General crankshaft of diesel engine watt gap: 0.12-0.207MM, gasoline engine crank main bearing shell gap, limit mill
Damage amount is no more than 0.17mm.Currently, the processing method of engine crankshaft bush is generally turning molding, intensity is often difficult to ensure, is existed sometimes
It produces fracture, the dangerous phenomenon such as serious wear, heat-resisting quantity difference, industrial production is endangered very big in use.Therefore, it develops
A kind of technique that engine crankshaft bush is effectively treated is most important to improve its obdurability, high temperature resistant, wear-resistant etc., to the prior art and warp
Ji development all has significant propulsion effect.
Summary of the invention
In view of the above problems, the invention proposes a kind of surface treatment works for reducing gasoline engine crank watt abrasion loss
Skill, quenching, temper processing, nitrocarburizing and surface rare earth/aluminium oxide plating intensive treatment including double fragmentation, is made
Engine crankshaft bush finished product there is excellent Wear-resistant, high-temperature resistant, comprehensive mechanical performance compared to improve before untreated 50% with
On, hardness is less than 0.01mm up to 63HRC, abrasion loss.
In order to achieve the above purpose, the following technical solution is employed by the present invention:
A kind of process of surface treatment reducing gasoline engine crank watt abrasion loss, comprising the following steps:
1) modifier treatment: the segmentation of molding engine crankshaft bush is quenched twice, is tempered, specially first at 1000-1020 DEG C
Under the conditions of quenching, 540-550 DEG C of high tempering, then again under the conditions of 980-1000 DEG C quenching, 300-320 average tempering, obtain
Product one；
2) nitrocarburizing is handled: adjusting furnace pressure is 630-640Pa, and gaseous mixture is passed through under the conditions of 510 DEG C and helps infiltration steam
Permeation processing is carried out to product one, 5-6h is kept, obtains product two；
3) rare earth/aluminium oxide plating processing: appropriate rare earth, aluminium oxide are blended, the poly- second of the two gross mass 10% is added
Enol and 2 times of water are ultrasonically treated 20-30min, and filtering is freeze-dried to obtain powder, then spread plating work using cold spraying
Skill will be sprayed on two surface of product, then 380-400 DEG C of heat preservation 3h under nitrogen atmosphere, then be cooled to room with 30-50 DEG C/h
Temperature is to get finished product.
Preferably, engine crankshaft bush uses alloy steel material, including following percentage composition component: C0.45- in step 1)
0.56%, Si0.9-1.2%, Mn0.5-0.6%, Ti0.7-1.1%, Mo0.8-1.3%, Cu0-0.5%, B0-0.1%, remaining
Amount is Fe and inevitable impurity.
Preferably, the engine crankshaft bush further includes Cr, Ni, and percentage composition is 10.8%≤Cr+Ni≤13.6%.
Preferably, in step 2) gaseous mixture be nitriding medium and carburizer mixture, C, N atomic ratio are in the gaseous mixture
2:3。
Preferably, it is the alcohol vapour that volume fraction is 6% and the ammonia that volume fraction is 2.5% that infiltration steam is helped in step 2)
The mixed vapour of base methyl formate steam.
Preferably, rare earth is the composition of La, Ce, Sc in step 3), and aluminium oxide is specially mesoporous aluminas, average pore size
For 5-10nm.
Preferably, rare earth and the addition mass ratio of mesoporous aluminas are 1:3 in step 3), and the two gross mass is two matter of product
The 3-6% of amount.
Due to using above-mentioned technical solution, the beneficial effects of the present invention are: process of surface treatment of the present invention includes twice
Quenching, temper processing, nitrocarburizing and the surface rare earth/aluminium oxide plating intensive treatment of segmentation, engine crankshaft bush end obtained
Product has excellent Wear-resistant, high-temperature resistant, and for comprehensive mechanical performance compared to improving 50% or more before untreated, hardness is reachable
63HRC, abrasion loss are less than 0.01mm.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention,
Technical scheme in the embodiment of the invention is clearly and completely described.Based on the embodiment of the present invention, the common skill in this field
Art personnel every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
Embodiment 1:
A kind of process of surface treatment reducing gasoline engine crank watt abrasion loss, comprising the following steps:
1) modifier treatment: the segmentation of molding engine crankshaft bush is quenched twice, is tempered, specially first under the conditions of 1010 DEG C
Quenching, 540 DEG C of high temperings, then quenching, 300 DEG C of average temperings under the conditions of 980 DEG C again, obtains product one；
2) nitrocarburizing is handled: adjusting furnace pressure is 630Pa, and gaseous mixture is passed through under the conditions of 510 DEG C and is helped and seeps steam to production
Product one carry out permeation processing, keep 5h, obtain product two；
3) rare earth/aluminium oxide plating processing: appropriate rare earth, aluminium oxide are blended, the poly- second of the two gross mass 10% is added
Enol and 2 times of water are ultrasonically treated 20min, and filtering is freeze-dried to obtain powder, then spread plating technique using cold spraying, will
It is sprayed on two surface of product, then 400 DEG C of heat preservation 3h under nitrogen atmosphere, then room temperature is cooled to get finished product with 30 DEG C/h.
Engine crankshaft bush is using alloy steel material, including following percentage composition component in step 1): C0.45%, Si1.1%,
Mn0.55%, Ti0.7%, Mo1.2%, Cu0.5%, B0.05%, surplus be Fe and inevitable impurity, further include Cr,
Ni, percentage composition are (Cr+Ni) 10.8%.
Gaseous mixture is the mixture of nitriding medium and carburizer in step 2), and C, N atomic ratio are 2:3 in the gaseous mixture, is helped
Seep the mixed vapour that steam is the alcohol vapour that volume fraction is 6% and the methyl carbamate steam that volume fraction is 2.5%.
Rare earth is the composition of La, Ce, Sc in step 3), and aluminium oxide is specially mesoporous aluminas, average pore size 5-
The addition mass ratio of 10nm, rare earth and mesoporous aluminas is 1:3, and the two gross mass is the 4% of two mass of product.
Embodiment 2:
A kind of process of surface treatment reducing gasoline engine crank watt abrasion loss, comprising the following steps:
1) modifier treatment: the segmentation of molding engine crankshaft bush is quenched twice, is tempered, specially first under the conditions of 1020 DEG C
Quenching, 550 DEG C of high temperings, then quenching, 310 DEG C of average temperings under the conditions of 990 DEG C again, obtains product one；
2) nitrocarburizing is handled: adjusting furnace pressure is 640Pa, and gaseous mixture is passed through under the conditions of 510 DEG C and is helped and seeps steam to production
Product one carry out permeation processing, keep 6h, obtain product two；
3) rare earth/aluminium oxide plating processing: appropriate rare earth, aluminium oxide are blended, the poly- second of the two gross mass 10% is added
Enol and 2 times of water are ultrasonically treated 30min, and filtering is freeze-dried to obtain powder, then spread plating technique using cold spraying, will
It is sprayed on two surface of product, then 390 DEG C of heat preservation 3h under nitrogen atmosphere, then room temperature is cooled to get finished product with 40 DEG C/h.
Engine crankshaft bush is using alloy steel material, including following percentage composition component in step 1): C0.5%, Si1%,
Mn0.6%, Ti1%, Mo1.8%, Cu0.1%, B0.1%, surplus are Fe and inevitable impurity, further include Cr, Ni, hundred
Dividing content is (Cr+Ni) 13.6%.
Gaseous mixture is the mixture of nitriding medium and carburizer in step 2), and C, N atomic ratio are 2:3 in the gaseous mixture, is helped
Seep the mixed vapour that steam is the alcohol vapour that volume fraction is 6% and the methyl carbamate steam that volume fraction is 2.5%.
Rare earth is the composition of La, Ce, Sc in step 3), and aluminium oxide is specially mesoporous aluminas, average pore size 5-
The addition mass ratio of 10nm, rare earth and mesoporous aluminas is 1:3, and the two gross mass is the 6% of two mass of product.
Embodiment 3:
A kind of process of surface treatment reducing gasoline engine crank watt abrasion loss, comprising the following steps:
1) modifier treatment: the segmentation of molding engine crankshaft bush is quenched twice, is tempered, specially first under the conditions of 1000 DEG C
Quenching, 550 DEG C of high temperings, then quenching, 310 DEG C of average temperings under the conditions of 1000 DEG C again, obtains product one；
2) nitrocarburizing is handled: adjusting furnace pressure is 640Pa, and gaseous mixture is passed through under the conditions of 510 DEG C and is helped and seeps steam to production
Product one carry out permeation processing, keep 6h, obtain product two；
3) rare earth/aluminium oxide plating processing: appropriate rare earth, aluminium oxide are blended, the poly- second of the two gross mass 10% is added
Enol and 2 times of water are ultrasonically treated 30min, and filtering is freeze-dried to obtain powder, then spread plating technique using cold spraying, will
It is sprayed on two surface of product, then 380 DEG C of heat preservation 3h under nitrogen atmosphere, then room temperature is cooled to get finished product with 40 DEG C/h.
Engine crankshaft bush is using alloy steel material, including following percentage composition component in step 1): C0.56%, Si1.2%,
Mn0.58%, Ti1.1%, Mo0%, Cu0.3%, B0.08%, surplus are Fe and inevitable impurity, further include Cr, Ni,
Percentage composition is (Cr+Ni) 11.2%.
Gaseous mixture is the mixture of nitriding medium and carburizer in step 2), and C, N atomic ratio are 2:3 in the gaseous mixture, is helped
Seep the mixed vapour that steam is the alcohol vapour that volume fraction is 6% and the methyl carbamate steam that volume fraction is 2.5%.
Rare earth is the composition of La, Ce, Sc in step 3), and aluminium oxide is specially mesoporous aluminas, average pore size 5-
The addition mass ratio of 10nm, rare earth and mesoporous aluminas is 1:3, and the two gross mass is the 5% of two mass of product.
Embodiment 4:
A kind of process of surface treatment reducing gasoline engine crank watt abrasion loss, comprising the following steps:
1) modifier treatment: the segmentation of molding engine crankshaft bush is quenched twice, is tempered, specially first under the conditions of 1000 DEG C
Quenching, 545 DEG C of high temperings, then quenching, 320 DEG C of average temperings under the conditions of 1000 DEG C again, obtains product one；
2) nitrocarburizing is handled: adjusting furnace pressure is 630Pa, and gaseous mixture is passed through under the conditions of 510 DEG C and is helped and seeps steam to production
Product one carry out permeation processing, keep 6h, obtain product two；
3) rare earth/aluminium oxide plating processing: appropriate rare earth, aluminium oxide are blended, the poly- second of the two gross mass 10% is added
Enol and 2 times of water are ultrasonically treated 30min, and filtering is freeze-dried to obtain powder, then spread plating technique using cold spraying, will
It is sprayed on two surface of product, then 390 DEG C of heat preservation 3h under nitrogen atmosphere, then room temperature is cooled to get finished product with 50 DEG C/h.
Engine crankshaft bush is using alloy steel material, including following percentage composition component in step 1): C0.48%, Si0.9%,
Mn0.5%, Ti0.8%, Mo1.3%, Cu0%, B0%, surplus are Fe and inevitable impurity, further include Cr, Ni, percentage
Content is (Cr+Ni) 12.4%.
Gaseous mixture is the mixture of nitriding medium and carburizer in step 2), and C, N atomic ratio are 2:3 in the gaseous mixture, is helped
Seep the mixed vapour that steam is the alcohol vapour that volume fraction is 6% and the methyl carbamate steam that volume fraction is 2.5%.
Rare earth is the composition of La, Ce, Sc in step 3), and aluminium oxide is specially mesoporous aluminas, average pore size 5-
The addition mass ratio of 10nm, rare earth and mesoporous aluminas is 1:3, and the two gross mass is the 3% of two mass of product.
Embodiment 5:
A kind of process of surface treatment reducing gasoline engine crank watt abrasion loss, comprising the following steps:
1) modifier treatment: the segmentation of molding engine crankshaft bush is quenched twice, is tempered, specially first under the conditions of 1020 DEG C
Quenching, 550 DEG C of high temperings, then quenching, 300 DEG C of average temperings under the conditions of 990 DEG C again, obtains product one；
2) nitrocarburizing is handled: adjusting furnace pressure is 630Pa, and gaseous mixture is passed through under the conditions of 510 DEG C and is helped and seeps steam to production
Product one carry out permeation processing, keep 5h, obtain product two；
3) rare earth/aluminium oxide plating processing: appropriate rare earth, aluminium oxide are blended, the poly- second of the two gross mass 10% is added
Enol and 2 times of water are ultrasonically treated 30min, and filtering is freeze-dried to obtain powder, then spread plating technique using cold spraying, will
It is sprayed on two surface of product, then 400 DEG C of heat preservation 3h under nitrogen atmosphere, then room temperature is cooled to get finished product with 50 DEG C/h.
Engine crankshaft bush is using alloy steel material, including following percentage composition component in step 1): C0.53%, Si1.1%,
Mn0.55%, Ti0.9%, Mo1%, Cu0%, B0.06%, surplus are Fe and inevitable impurity.
Gaseous mixture is the mixture of nitriding medium and carburizer in step 2), and C, N atomic ratio are 2:3 in the gaseous mixture, is helped
Seep the mixed vapour that steam is the alcohol vapour that volume fraction is 6% and the methyl carbamate steam that volume fraction is 2.5%.
Rare earth is the composition of La, Ce, Sc in step 3), and aluminium oxide is specially mesoporous aluminas, average pore size 5-
The addition mass ratio of 10nm, rare earth and mesoporous aluminas is 1:3, and the two gross mass is the 4% of two mass of product.
Embodiment 6:
A kind of process of surface treatment reducing gasoline engine crank watt abrasion loss, comprising the following steps:
1) modifier treatment: the segmentation of molding engine crankshaft bush is quenched twice, is tempered, specially first under the conditions of 1010 DEG C
Quenching, 540 DEG C of high temperings, then quenching, 320 DEG C of average temperings under the conditions of 980 DEG C again, obtains product one；
2) nitrocarburizing is handled: adjusting furnace pressure is 630Pa, and gaseous mixture is passed through under the conditions of 510 DEG C and is helped and seeps steam to production
Product one carry out permeation processing, keep 6h, obtain product two；
3) rare earth/aluminium oxide plating processing: appropriate rare earth, aluminium oxide are blended, the poly- second of the two gross mass 10% is added
Enol and 2 times of water are ultrasonically treated 20min, and filtering is freeze-dried to obtain powder, then spread plating technique using cold spraying, will
It is sprayed on two surface of product, then 380 DEG C of heat preservation 3h under nitrogen atmosphere, then room temperature is cooled to get finished product with 30 DEG C/h.
Engine crankshaft bush is using alloy steel material, including following percentage composition component in step 1): C0.55%, Si1.2%,
Mn0.56%, Ti1.1%, Mo1.2%, Cu0.2%, B0%, surplus are Fe and inevitable impurity.
Gaseous mixture is the mixture of nitriding medium and carburizer in step 2), and C, N atomic ratio are 2:3 in the gaseous mixture, is helped
Seep the mixed vapour that steam is the alcohol vapour that volume fraction is 6% and the methyl carbamate steam that volume fraction is 2.5%.
Rare earth is the composition of La, Ce, Sc in step 3), and aluminium oxide is specially mesoporous aluminas, average pore size 5-
The addition mass ratio of 10nm, rare earth and mesoporous aluminas is 1:3, and the two gross mass is the 5% of two mass of product.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (5)
1. a kind of process of surface treatment for reducing gasoline engine crank watt abrasion loss, which comprises the following steps:
1) modifier treatment: the segmentation of molding engine crankshaft bush is quenched twice, is tempered, specially first in 1000-1020 DEG C of condition
Lower quenching, 540-550 DEG C of high tempering, then quenching, 300-320 average tempering under the conditions of 980-1000 DEG C again, obtains product
One；
Wherein, engine crankshaft bush uses alloy steel material, including following percentage composition component: C 0.45-0.56%, Si 0.9-
1.2%, Mn 0.5-0.6%, Ti 0.7-1.1%, Mo 0.8-1.3%, Cu 0-0.5%, B 0-0.1%, surplus be Fe and
Inevitable impurity；
2) nitrocarburizing is handled: adjusting furnace pressure is 630-640Pa, and gaseous mixture is passed through under the conditions of 510 DEG C and is helped and seeps steam to production
Product one carry out permeation processing, keep 5-6h, obtain product two；
Wherein, gaseous mixture is the mixture of nitriding medium and carburizer, and C, N atomic ratio are 2:3 in the gaseous mixture；
3) rare earth/aluminium oxide plating processing: appropriate rare earth, aluminium oxide are blended, the polyvinyl alcohol of the two gross mass 10% is added
With 2 times of water of the two gross mass, it is ultrasonically treated 20-30min, filtering is freeze-dried to obtain powder, then seeps using cold spraying diffusion
Obtained material is sprayed on two surface of product by depositing process, then 380-400 DEG C of heat preservation 3h under nitrogen atmosphere, then with 30-50
DEG C/h is cooled to room temperature to get finished product.
2. the process of surface treatment according to claim 1 for reducing gasoline engine crank watt abrasion loss, it is characterised in that: described
Engine crankshaft bush further includes Cr, Ni, and percentage composition is 10.8%≤Cr+Ni≤13.6%.
3. the process of surface treatment according to claim 1 for reducing gasoline engine crank watt abrasion loss, it is characterised in that: step
2) help that seep steam be the mixed of the alcohol vapour that volume fraction is 6% and the methyl carbamate steam that volume fraction is 2.5% in
Close steam.
4. the process of surface treatment according to claim 1 for reducing gasoline engine crank watt abrasion loss, it is characterised in that: step
3) rare earth is the composition of La, Ce, Sc in, and aluminium oxide is specially mesoporous aluminas, average pore size 5-10nm.
5. the process of surface treatment according to claim 1 for reducing gasoline engine crank watt abrasion loss, it is characterised in that: step
3) rare earth and the addition mass ratio of mesoporous aluminas are 1:3 in, and the two gross mass is the 3-6% of two mass of product.
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| CN110042339B (en) * | 2019-06-05 | 2021-07-06 | 哈尔滨工程大学 | Vacuum carburization method for reducing temperature and increasing speed |
| CN113122683B (en) * | 2021-04-19 | 2022-09-30 | 江阴大手印精密材料科技发展有限公司 | High-wear-resistance alloy steel for linear guide rail and preparation method thereof |
| CN113245794A (en) * | 2021-05-30 | 2021-08-13 | 东风汽车车轮随州有限公司 | Gapless elastic bearing bush of rolling die and machining method thereof |
| CN114000095B (en) * | 2022-01-04 | 2022-04-29 | 潍坊谷合传动技术有限公司 | Surface carbonitriding treatment method for planet shaft for tractor axle |
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