CN109504966A - A kind of preparation method of cylinder head vermicular cast iron surface abrasion resistance anti-friction coating - Google Patents
A kind of preparation method of cylinder head vermicular cast iron surface abrasion resistance anti-friction coating Download PDFInfo
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- CN109504966A CN109504966A CN201811491506.1A CN201811491506A CN109504966A CN 109504966 A CN109504966 A CN 109504966A CN 201811491506 A CN201811491506 A CN 201811491506A CN 109504966 A CN109504966 A CN 109504966A
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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
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- Cylinder Crankcases Of Internal Combustion Engines (AREA)
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Abstract
A kind of preparation method of cylinder head vermicular cast iron surface abrasion resistance anti-friction coating.A kind of preparation method of vermicular cast iron surface abrasion resistance anti-friction coating first carries out appropriate heat treatment in advance to the vermicular cast iron after surface treatment；Then by Co based alloy, Cr3C2And MoS2Powder is uniformly mixed according to a ratio, drying；Recycle laser melting and coating technique that the powder of drying is deposited on vermicular cast iron surface by multi-track overlapping form, to form Co base composite coating；Finally, subsequent heat treatment is carried out to Co base composite coating, to obtain wear resistant friction reducing cladding layer.Advantage: good metallurgical bonding can significantly reduce the probability of decortication, separation, peeling；Small to basis material damage, matrix deformation and loss of strength are smaller；Heat treatment in advance is carried out to vermicular cast iron matrix, thermal stress can be effectively reduced, control the germinating of crackle；Subsequent heat treatment is carried out to the wear resistant friction reducing coating of preparation, the residual stress after reducing and eliminating laser melting coating avoids coating from cracking in use；It has excellent performance, while having both wear-resisting and antifriction performance；Cladding is high-efficient.
Description
Technical field
The invention belongs to field of surface engineering technique more particularly to a kind of cylinder head vermicular cast iron surface abrasion resistance anti-friction coatings
Preparation method.
Background technique
Vermicular cast iron is the grey cast-iron with a kind of transitional form between sheet and globular graphite, is led because its is excellent
Heat and casting character, good plasticity and fatigue performance, it has also become the preferred material of engine key position cylinder head.So
And cylinder head vermicular cast iron usually bears a variety of intersection wear forms under biggish kinetic friction force, such as abrasive wear, corrosion
Abrasion etc., therefore directly use the working condition requirement for being difficult to meet wear resistant friction reducing.
Laser melting and coating technique is a kind of advanced surface engineering technology, has cladding layer and matrix is in metallurgical bonding, matrix
The advantages that thermal deformation is small, dilution rate is controllable is more applied to a variety of basis materials such as carbon steel, steel alloy, titanium alloy
Surface peening.The formation of laser cladding layer is a complicated physical and chemical process and melt rapid solidification.Therefore, shadow
The factor of the forming quality and performance that ring laser cladding layer is more complex, wherein cladding material is a principal element.Co based alloy
Powder has good high-temperature behavior and corrosion-proof wear performance, is often applied to the industrial circles such as metallurgy, petrochemical industry；Cr3C2With compared with
High hardness, and C and Cr are also solution strengthening element, can improve the abrasive resistance of cladding layer；MoS2With stable frictional property
Can, it is current most widely used solid lubricant, self-lubricating effect can be played by being added in cladding layer.Therefore, by three kinds
Uniformly mixed powder melting can play the effect of wear resistant friction reducing in matrix surface simultaneously according to a certain ratio.But due to compacted ink
Cast iron phosphorus content is larger, under the characteristic of laser melting coating rapid heat cycle, is easy to produce quench-hardened case, crack tendence is caused to become larger,
To affect the wear resistant friction reducing performance of cladding layer.
Therefore, how on cylinder head vermicular cast iron surface a kind of composite coating for having both wear resistant friction reducing performance is prepared, to prolong
The service life of long cylinder head is the current technical issues that need to address.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of simple process reasonable cylinder head vermicular cast iron surface is resistance to
The preparation method of anti-friction coating is ground, the coating of preparation is not only firmly combined, and has both wear resistant friction reducing performance.
The technical scheme of the invention to solve the technical problem is: a kind of cylinder head vermicular cast iron surface abrasion resistance subtracts
It rubs the preparation method of coating, it is characterised in that the following steps are included:
1) it is derusted to cylinder head vermicular cast iron surface, oil removing, drying process；
2) appropriate heat treatment in advance is carried out to treated vermicular cast iron；
3) by Co based alloy, Cr3C2And MoS2Three kinds of powder mechanical mixtures are uniform, then dry；
4) wear resistant friction reducing coating is prepared: using laser melting and coating technique, the multiple tracks that the powder of above-mentioned drying is passed through into laser beam
Lap joint form is deposited on the vermicular cast iron surface after preheating, obtains wear resistant friction reducing coating；
5) subsequent heat treatment is carried out to above-mentioned wear resistant friction reducing coating；
6) machining processes finally are carried out to wear resistant friction reducing coating.
Preferably, the cylinder head vermicular cast iron in the step 1) selects vermicular cast iron RuT300.
Preferably, the preparatory hot temperature in the step 2) is 200~300 DEG C.
Further, the Co base alloy powder in the step 3) is Co base alloy powder Tribaloy 800 or Co based alloy
Powder Tribaloy 400 or Co base alloy powder Stellite 156；Co based alloy, Cr3C2And MoS2The quality of three kinds of powder
Percentage are as follows: Cr3C2Powder 10%~15%, MoS2Powder 4%~7%, remaining is Co base alloy powder.
Further, the hot spot of the laser beam of the step 4) is round or rectangle, the diameter of circular light spot is 3.0~
6.0mm, the size of rectangular light spot are 10~12mm × 1.5~2.5mm.
Further, the design parameter of the laser melting coating of the step 4) are as follows: power be 1.8~2.4kW, speed be 6~
12mm/s, powder sending quantity are 3.0~5.0g/min, and protection gas Ar throughput is 13~17L/min, powder feeding gas N2Flow be 4.0~
The wear resistant friction reducing coating layer thickness of 8.5L/min, overlapping rate 30~50%, preparation are controlled in 1.0~1.5mm.
Further, the step 4) is prepared wear resistant friction reducing coating and is not limited to be selected using laser melting and coating technique
It is prepared by oxyacetylene welding, plasma surfacing efficient surface consolidation technology.
Further, step 5) the subsequent heat treatment technique are as follows: 350~400 DEG C of temperature, 1.5~2.5h is kept the temperature, it is slowly cold
But then air-cooled to 190~210 DEG C.
Finally, the requirement of the machining processes of the step 6) are as follows: lustrous surface, no cutter trade are micro- to distinguish processing side
To control Coating Surface Roughness is the grade of Ra0.2~0.8.
Compared with the prior art, the advantages of the present invention are as follows:
1, good metallurgical bonding: compared with plating, hot-spraying technique, wear resistant friction reducing layer prepared by the present invention is metallurgical junction
It closes, can significantly reduce the probability of decortication, separation, peeling；
2, damage to basis material small: the laser melting and coating technique that the present invention uses deforms vermicular cast iron matrix and intensity is damaged
It loses smaller；
3, the present invention carries out the heat treatment in advance of appropriateness to vermicular cast iron matrix, temperature gradient when reducing cooling, thus
Thermal stress can be effectively reduced, control the germinating of crackle；
4, the present invention carries out subsequent heat treatment to the wear resistant friction reducing coating of preparation, residual after reducing and eliminating laser melting coating
Residue stress avoids coating cracked due to the induction of extraneous uncontrollable factor in use；
5, have excellent performance: coating prepared by the present invention has taken into account the hardness and wear-resisting property of metal Co base coating, has simultaneously
The standby self-lubricating property of anti-friction coating can effectively prevent cylinder head because of premature failure caused by fretting wear, extend cylinder head
Service life；
6, cladding is high-efficient: in addition to laser melting and coating technique, can also select the surfaces such as oxyacetylene welding, plasma surfacing
The preparation of consolidation technology progress wearing layer.
Detailed description of the invention
Fig. 1 is operation chart of the embodiment 1 provided by the invention in laser cladding process；
1. powder feeding gas；2. laser beam；3. protecting gas；4. coaxial powder-feeding cladding head；5. powder stream；6. molten bath；7. coating；
Fig. 2 is the surface macro morphology of wear resistant friction reducing coating prepared by embodiment 1；
Fig. 3 is the firmness change tendency chart of wear resistant friction reducing coating through-thickness prepared by embodiment 1；
Fig. 4 is the abrasion loss comparison of wear resistant friction reducing coating prepared by embodiment 1 and vermicular cast iron matrix；
Fig. 5 is that the coefficient of friction variation at any time of wear resistant friction reducing coating prepared by embodiment 1 and vermicular cast iron matrix is bent
Line.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
Embodiment 1
(a) it is derusted to cylinder head vermicular cast iron RuT300 (chemical component is shown in Table 1) surface, oil removing, drying process；
(b) heat treatment in advance is carried out to step (a) treated vermicular cast iron, preheating temperature is 200 DEG C；
(c) by Co based alloy, Cr3C2And MoS2Three kinds of powder mechanical mixtures are uniform, then dry, wherein Cr3C2Powder
Mass percent is 10%, MoS2The mass percent of powder is 6%, remaining is Co base alloy powder Tribaloy800；
(d) laser melting and coating technique is used, the powder that step (c) is dried is deposited on the vermicular cast iron after step (b) preheating
Surface, obtains that a kind of bonding state is good, wear resistant friction reducing coating of flawless, passes through Optimizing Process Parameters, coating layer thickness control
In 1.2mm or so, laser beam spot is the circular light spot of diameter 3.5mm, power 2.0kW, speed 8mm/s, and powder sending quantity is
3.5g/min, protection gas Ar throughput are 15L/min, powder feeding gas N2Flow is 5.5L/min, overlapping rate 30%；Thus formed
A kind of high rigidity, wear-resisting property and the good composite coating of friction reducing effect, the surface macro morphology of composite coating are as shown in Figure 2.
(e) subsequent heat treatment, heat treatment process are carried out to the wear resistant friction reducing coating of step (d) are as follows: 400 DEG C of heat preservation 2h delay
Slow cool down is then air-cooled to 200 DEG C.
(f) compacted ironing surface composite coating is machined, until lustrous surface, and control Coating Surface Roughness
For Ra0.2 grade.
The chemical component (mass fraction %) of 1 vermicular cast iron RuT300 of table
| Element | C | Si | Mn | S | P | Fe |
| Content | 3.5 | 2.8 | 0.5 | <0.06 | <0.07 | Surplus |
Next the performance of the wear resistant friction reducing coating of preparation is detected:
The firmness change tendency chart of wear resistant friction reducing coating through-thickness is as shown in Figure 3, it can be seen that composite coating is put down
Equal microhardness reaches 609.5HV, is increased to 3 times of vermicular cast iron matrix hardness or so；
The abrasion loss of the wear resistant friction reducing coating of the present embodiment and vermicular cast iron matrix is compared, as shown in figure 4, can be with
The abrasion loss for finding out composite coating is only the 1/6 of matrix, and wear-resisting property greatly improves；
The change curve of the coefficient of friction of wear resistant friction reducing coating and vermicular cast iron matrix at any time is as shown in figure 5, can see
Average friction coefficient to vermicular cast iron is 0.5382, and the average friction coefficient of coating is 0.2865, and friction reducing effect greatly improves.
Embodiment 2
(a) it is derusted to the surface cylinder head vermicular cast iron RuT300, oil removing, drying process；
(b) heat treatment in advance is carried out to step (a) treated vermicular cast iron, preheating temperature is 250 DEG C；
(c) by Co based alloy, Cr3C2And MoS2Three kinds of powder mechanical mixtures are uniform, then dry, wherein Cr3C2Powder
Mass percent is 12%, MoS2The mass percent of powder is 5%, remaining is Co base alloy powder Tribaloy400；
(d) laser melting and coating technique is used, the powder that step (c) is dried is deposited on the vermicular cast iron after step (b) preheating
Surface, obtains that a kind of bonding state is good, wear resistant friction reducing coating of flawless, passes through Optimizing Process Parameters, coating layer thickness control
In 1.3mm or so, laser beam spot is the circular light spot of diameter 5mm, power 2.2kW, speed 10mm/s, and powder sending quantity is
4.0g/min, protection gas Ar throughput are 14L/min, powder feeding gas N2Flow is 6.5L/min, overlapping rate 40%；
(e) subsequent heat treatment, heat treatment process are carried out to the wear resistant friction reducing coating of step (d) are as follows: 350 DEG C of heat preservation 2h delay
Slow cool down is then air-cooled to 200 DEG C；
(f) compacted ironing surface composite coating is machined, until lustrous surface, and control Coating Surface Roughness
For Ra0.4 grade.
Embodiment 3
(a) it is derusted to the surface cylinder head vermicular cast iron RuT300, oil removing, drying process；
(b) heat treatment in advance is carried out to step (a) treated vermicular cast iron, preheating temperature is 300 DEG C；
(c) by Co based alloy, Cr3C2And MoS2Three kinds of powder mechanical mixtures are uniform, then dry.Wherein, Cr3C2Powder
Mass percent is 15%, MoS2The mass percent of powder is 4%, remaining is Co base alloy powder Stellite156；
(d) laser melting and coating technique is used, the powder that step (c) is dried is deposited on the vermicular cast iron after step (b) preheating
Surface, obtains that a kind of bonding state is good, wear resistant friction reducing coating of flawless；Pass through Optimizing Process Parameters, coating layer thickness control
In 1.5mm or so, hot spot is the rectangular light spot of 12mm × 2mm, power 2.4kW, speed 12mm/s, powder sending quantity 5.0g/
Min, protection gas Ar throughput are 17L/min, powder feeding gas N2Flow is 7.5L/min, overlapping rate 45%；
(e) subsequent heat treatment, heat treatment process are carried out to the wear resistant friction reducing coating of step (d) are as follows: 400 DEG C of heat preservation 2h delay
Slow cool down is then air-cooled to 200 DEG C；
(f) compacted ironing surface composite coating is machined, until lustrous surface, and control Coating Surface Roughness
For Ra0.8 grade.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of preparation method of cylinder head vermicular cast iron surface abrasion resistance anti-friction coating, it is characterised in that the following steps are included:
1) it is derusted to cylinder head vermicular cast iron surface, oil removing, drying process；
2) appropriate heat treatment in advance is carried out to treated vermicular cast iron；
3) by Co based alloy, Cr3C2And MoS2Three kinds of powder mechanical mixtures are uniform, then dry；
4) wear resistant friction reducing coating is prepared: using laser melting and coating technique, the multi-track overlapping that the powder of above-mentioned drying is passed through into laser beam
Form is deposited on the vermicular cast iron surface after preheating, obtains wear resistant friction reducing coating；
5) subsequent heat treatment is carried out to above-mentioned wear resistant friction reducing coating；
6) machining processes finally are carried out to wear resistant friction reducing coating.
2. preparation method according to claim 1, it is characterised in that: the cylinder head vermicular cast iron in the step 1) is selected
Vermicular cast iron RuT300.
3. preparation method according to claim 1, it is characterised in that: preparatory hot temperature in the step 2) is 200~
300℃。
4. preparation method according to claim 2, it is characterised in that: the Co base alloy powder in the step 3) is Co base
Alloy powder Tribaloy 800 or Co base alloy powder Tribaloy 400 or Co base alloy powder Stellite 156；Co base
Alloy, Cr3C2And MoS2The mass percent of three kinds of powder are as follows: Cr3C2Powder 10%~15%, MoS2Powder 4%~7%,
Remaining is Co base alloy powder.
5. preparation method according to claim 1, it is characterised in that: the hot spot of the laser beam of the step 4) be it is round or
Rectangle, the diameter of circular light spot are 3.0~6.0mm, and the size of rectangular light spot is 10~12mm × 1.5~2.5mm.
6. preparation method according to claim 1, it is characterised in that: the design parameter of the laser melting coating of the step 4)
Are as follows: power is 1.8~2.4kW, and speed is 6~12mm/s, and powder sending quantity is 3.0~5.0g/min, and protection gas Ar throughput is 13
~17L/min, powder feeding gas N2Flow is 4.0~8.5L/min, overlapping rate 30~50%, the wear resistant friction reducing coating layer thickness control of preparation
System is in 1.0~1.5mm.
7. preparation method according to claim 1, it is characterised in that: the step 4) prepares wear resistant friction reducing coating and do not limit to
In using laser melting and coating technique, oxyacetylene welding or plasma surfacing efficient surface consolidation technology system can also be selected
It is standby.
8. preparation method according to claim 1, it is characterised in that: step 5) the subsequent heat treatment technique are as follows: temperature
350~400 DEG C, 1.5~2.5h is kept the temperature, progressively cools to 190~210 DEG C, it is then air-cooled.
9. preparation method according to claim 1, it is characterised in that: the requirement of the machining processes of the step 6)
Are as follows: lustrous surface, no cutter trade are micro- to distinguish that machine direction, control Coating Surface Roughness are the grade of Ra0.2~0.8.
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Cited By (6)
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| CN110607526A (en) * | 2019-09-06 | 2019-12-24 | 中国兵器科学研究院宁波分院 | Method for preparing nickel-based wide-temperature-range self-lubricating coating with nano structure by cold spraying |
| CN110900128A (en) * | 2019-12-02 | 2020-03-24 | 浙江翰德圣智能再制造技术有限公司 | Method for inhibiting vermicular cast iron cladding cracks through process window |
| CN111441051A (en) * | 2020-05-11 | 2020-07-24 | 北京工业大学 | Laser-plasma composite energy field deposition method for cobalt-based gradient high-temperature wear-resistant antifriction coating |
| CN111843371A (en) * | 2020-06-23 | 2020-10-30 | 苏州优霹耐磨复合材料有限公司 | Low-friction-coefficient surfacing composite wear-resisting plate and manufacturing process thereof |
| CN112981394A (en) * | 2021-02-05 | 2021-06-18 | 漳州欧凯家具有限公司 | Preparation method of high-temperature-resistant coating on surface of tea table |
| CN114411156A (en) * | 2022-01-21 | 2022-04-29 | 中国矿业大学 | Preparation method of wear-resistant casting for complex conditions and wear-resistant casting |
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Cited By (9)
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|---|---|---|---|---|
| CN110607526A (en) * | 2019-09-06 | 2019-12-24 | 中国兵器科学研究院宁波分院 | Method for preparing nickel-based wide-temperature-range self-lubricating coating with nano structure by cold spraying |
| CN110607526B (en) * | 2019-09-06 | 2022-07-05 | 中国兵器科学研究院宁波分院 | Method for preparing nickel-based wide-temperature-range self-lubricating coating with nano structure by cold spraying |
| CN110900128A (en) * | 2019-12-02 | 2020-03-24 | 浙江翰德圣智能再制造技术有限公司 | Method for inhibiting vermicular cast iron cladding cracks through process window |
| CN111441051A (en) * | 2020-05-11 | 2020-07-24 | 北京工业大学 | Laser-plasma composite energy field deposition method for cobalt-based gradient high-temperature wear-resistant antifriction coating |
| CN111441051B (en) * | 2020-05-11 | 2021-12-24 | 北京工业大学 | Laser-plasma composite energy field deposition method for cobalt-based gradient high-temperature wear-resistant antifriction coating |
| CN111843371A (en) * | 2020-06-23 | 2020-10-30 | 苏州优霹耐磨复合材料有限公司 | Low-friction-coefficient surfacing composite wear-resisting plate and manufacturing process thereof |
| CN112981394A (en) * | 2021-02-05 | 2021-06-18 | 漳州欧凯家具有限公司 | Preparation method of high-temperature-resistant coating on surface of tea table |
| CN114411156A (en) * | 2022-01-21 | 2022-04-29 | 中国矿业大学 | Preparation method of wear-resistant casting for complex conditions and wear-resistant casting |
| CN114411156B (en) * | 2022-01-21 | 2024-03-19 | 中国矿业大学 | Preparation method of wear-resistant casting for complex conditions and wear-resistant casting |
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Application publication date: 20190322 |