CN101736279B - Hypersonic flame spraying process for self-lubricating wear-resistant coating - Google Patents
Hypersonic flame spraying process for self-lubricating wear-resistant coating Download PDFInfo
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Abstract
The invention relates to a hypersonic flame spraying process for a self-lubricating wear-resistant coating, which comprises the following steps of: preparing a workpiece to be sprayed, removing oil stain with acetone, then carrying out white alundum blowing treatment, and finally carrying out hypersonic flame spraying, wherein the surface of the workpiece to be sprayed after being blown needs to be uniform, rough and free of metallic luster; and after blowing and roughening, spraying a coating of which the thickness is 300-400mum on the workpiece to be sprayed. The process comprises the following concrete conditions that: the spraying distance is 340-360mm, the powder feeding rate is 30-40g/min, the oxygen flow is 1750-1800l/h, the oxygen pressure is 131+/-10 psi, the kerosene flow is 5.3-5.5 g/hr, and the kerosene pressure is 113+/-15 psi. The invention has the advantages that by using hypersonic flame to spray chromium carbide/nickel-chromium powder containing fluoride, a high-temperature self-lubricating wear-resistant coating which is suitable for brush type sealing can be obtained; and the high-temperature self-lubricating wear-resistant coating is in a laminated structure and has excellent mechanical properties, low porosity and compact structure.
Description
Technical field
The present invention relates to the high-velocity spray technical field, a kind of hypersonic flame spraying process for self-lubricating wear-resistant coating is provided especially.
Background technology
The packing technique of streaming system is the important channel of improving motor performance in the mover.On mover, be designed with the many places tightness system, between the stator and rotor such as bearing, pneumatic plant, turbine, between pneumatic plant and turbine blade and internal cooling channel etc.The gross leak rate of traditional labyrinth gas seals constantly descends motor performance, and specific fuel oil consumption constantly increases, and brush seal is a kind of new type sealing device that can significantly reduce the gas leakage of aircraft engine secondary stream.Can adapt to the transient state radial deformation or the eccentric movement of rotor, and increase leakage rate indistinctively.In addition, the brush silk of brush sealing forms flexible the contact with rotor spindle damping is provided, and can improve the vibration performance of rotor-support-foundation system, be continue to use for many years comb tooth sealing the most simply, practicality, the most effective regeneration product.
Constant basically for guaranteeing that brush is sealed in lifetime internal leakage characteristic, brush seal brush silk when initialization be shrink-fit with the runway surface, brush silk and cause the brush seal degradation with the surperficial contact friction of runway, even the structural integrity of breakseal.In order to improve sealing property, be covered with the wear-resistant coating that contains self-lubricating material in the runway surfaces coated, time sealing brush scratches axle journal to prevent work, can reduce the frictional dissipation of sealing bristle simultaneously.Chromium carbide/nickel chromium triangle material has excellent high temperature oxidation resistance and hot hardness, often is used to the coating that bonding strength and wear-resisting resistance are had relatively high expectations.But in the Working environment of reality,, friction pair has been produced more serious frictional wear because it has higher hardness.
Summary of the invention
The objective of the invention is provides a kind of hypersonic flame spraying process for self-lubricating wear-resistant coating in order to reach the requirement of brush type sealed track to bonding strength and wear-resisting resistance.
The invention provides a kind of hypersonic flame spraying process for self-lubricating wear-resistant coating; It is characterized in that: the concrete spraying process of described hypersonic flame spraying process for self-lubricating wear-resistant coating does; Prepare to be sprayed; Treat spray piece and degrease, carry out the white fused alumina blast then and handle, carry out HVAF at last with acetone;
Wherein: answered even roughness, no metalluster by the surface behind the blast for to be sprayed, after the blast alligatoring, coating thickness is the coating of 300～400 μ m on to be sprayed; The HVAF processing parameter is specially: spray distance 340～360mm; Powder feeding rate 30～40 gram/minute, 1750～1800 liters/hour of oxygen flows, 131 ± 10 pounds/square inch of oxygen pressures; Kerosene oil flow 5.3～5.5 gallons per hours, 113 ± 15 pounds/square inch of kerosene pressure.
Described dusty spray is provided by Beijing Non-Fervoous Metal Inst., and concrete composition and quality percentage composition are following: Cr
3C
2Account for 53～57%, NiCr accounts for 34～37%, CaF
2, BaF
2Be surplus; The performance requriements of the nickel chromium triangle/chromium carbide powder of fluoride is following: flowability<110s/50g, granularity is in-200～+ 270 order≤5.0% ,-270～+ 325 order≤25.0% ,-325>=70.0% scope.
Described to be sprayed body material adopts iron and steel or superalloy.
The anchoring strength of coating scope is 43MPa～47.6Mpa.
Described HVAF characteristics are 2900～3100 ℃ of flame velocity 1500m/s～2000m/s, temperature.
HVAF is a kind of HVOF technology, and the characteristics so that its flame velocity is high, temperature is low are particularly conducive to the spray coating metal ceramic coating.High velocity of particle helps obtaining high coating compactness and good binding intensity; And low flame temperature can effectively suppress or reduce the decomposition of hard in spraying process such as carbide, makes the coating of preparation keep the weave construction of the original excellent abrasive resistance of sintering metal.HVOF spray coating metal ceramic coating, especially WC-Co, Cr
3C
2-NiCr metal-ceramic coating can make part life prolong 2～10 times with performances such as its superior wear-resistant material wearing and tearing, erosive wear, skimming wears, obtains widespread use at industrial circle.
Chromium carbide/nickel chromium triangle material has excellent high temperature oxidation resistance and hot hardness, often is used to the coating that bonding strength and wear-resisting resistance are had relatively high expectations.But in the Working environment of reality,, friction pair has been produced more serious frictional wear because it has higher hardness.In coating, add lubricants such as Calcium Fluoride (Fluorspan) and barium fluoride, can reduce the frictional coefficient of coating, improve wear resistance.
Adopt the microstructure of Leica metallography microscope sem observation supersonic spray coating chromium carbide/nickel chromium triangle coating.In the supersonic spray coating process, high velocity of particle can form the little dense coating of porosity after making powder and matrix collision, is interlaced between coating and the coating and piles up.
The bonding strength test of adopting homemade universal hydraulic testing machine to test to carry out high-temperature self-lubricating coating, the bonding strength test is carried out with reference to GBT8642-88 " mensuration of metal thermal spraying layer bonding strength ".
The anchoring strength of coating scope that records is 43MPa～47.6MPa.
The hardness of coating is the very important mechanical performance index of coating, is related to multiple functions such as abrasion property, intensity and coating work-ing life.
Macrohardness adopts HR15N, in the bonding strength test piece, makes an experiment, and on whole coat side, on average takes get its arithmetical av at 10, and microhardness detects carries out on metallographic specimen, loads the 300g metering.The test detected result is: the HR15N value is between 86～90, and HV0.3 is between 631～661.
Oxygen flow is 1750～1800SCFH, and kerosene oil flow is that 5.3～5.5gph scope is the optimal processing parameter scope, and coating structure is even compact relatively, and porosity is low, and mechanical property is qualified.
Advantage of the present invention:
Use the chromium carbide/nickel chromium triangle powder of HVAF fluoride, can obtain to be applicable to the brush high-temperature self-lubrication wear-resistant coating of obturaging.The high-temperature self-lubrication wear-resistant coating has the good mechanical performance, and coating is a laminate structure, and porosity is low, compact structure.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation:
Fig. 1 is the microstructure view of HVAF self-lubricating coat in use.
Embodiment
Embodiment 1
Present embodiment provides a kind of hypersonic flame spraying process for self-lubricating wear-resistant coating; It is characterized in that: the concrete spraying process of described hypersonic flame spraying process for self-lubricating wear-resistant coating does; Prepare to be sprayed; Treat spray piece and degrease, carry out the white fused alumina blast then and handle, carry out HVAF at last with acetone;
Wherein: to be sprayed, no metalluster even by the surface behind the blast, after the blast alligatoring, coating thickness is the coating of 300 μ m on to be sprayed; The HVAF processing parameter is specially: spray distance 340mm; Powder feeding rate 30 gram/minute, 1750 liters/hour of oxygen flows, 121 pounds/square inch of oxygen pressures; Kerosene oil flow 5.3 gallons per hours, 98 pounds/square inch of kerosene pressure.
Described dusty spray is provided by Beijing Non-Fervoous Metal Inst., and concrete composition and quality percentage composition are following: Cr
3C
2Account for 53～57%, NiCr accounts for 34～37%, CaF
2, BaF
2Be surplus; The performance requriements of the nickel chromium triangle/chromium carbide powder of fluoride is following: flowability<110s/50g, granularity is in-200～+ 270 order≤5.0% ,-270～+ 325 order≤25.0% ,-325>=70.0% scope.
Described to be sprayed body material adopts iron and steel or superalloy.
The anchoring strength of coating scope is 43MPa.
Described HVAF processing parameter also comprises, 2900 ℃ of flame velocity 1500m/s, temperature.
HVAF is a kind of HVOF technology, and the characteristics so that its flame velocity is high, temperature is low are particularly conducive to the spray coating metal ceramic coating.High velocity of particle helps obtaining high coating compactness and good binding intensity; And low flame temperature can effectively suppress or reduce the decomposition of hard in spraying process such as carbide, makes the coating of preparation keep the weave construction of the original excellent abrasive resistance of sintering metal.HVOF spray coating metal ceramic coating, especially WC-Co, Cr
3C
2-NiCr metal-ceramic coating can make part life prolong 2～10 times with performances such as its superior wear-resistant material wearing and tearing, erosive wear, skimming wears, obtains widespread use at industrial circle.
Chromium carbide/nickel chromium triangle material has excellent high temperature oxidation resistance and hot hardness, often is used to the coating that bonding strength and wear-resisting resistance are had relatively high expectations.But in the Working environment of reality,, friction pair has been produced more serious frictional wear because it has higher hardness.In coating, add lubricants such as Calcium Fluoride (Fluorspan) and barium fluoride, can reduce the frictional coefficient of coating, improve wear resistance.
Adopt the microstructure of Leica metallography microscope sem observation supersonic spray coating chromium carbide/nickel chromium triangle coating.In the supersonic spray coating process, high velocity of particle can form the little dense coating of porosity after making powder and matrix collision, is interlaced between coating and the coating and piles up.
The bonding strength test of adopting homemade universal hydraulic testing machine to test to carry out high-temperature self-lubricating coating, the bonding strength test is carried out with reference to GBT8642-88 " mensuration of metal thermal spraying layer bonding strength ".
The anchoring strength of coating scope that records is 43MPa.
The hardness of coating is the very important mechanical performance index of coating, is related to multiple functions such as abrasion property, intensity and coating work-ing life.
Macrohardness adopts HR15N, in the bonding strength test piece, makes an experiment, and on whole coat side, on average takes get its arithmetical av at 10, and microhardness detects carries out on metallographic specimen, loads the 300g metering.The test detected result is: the HR15N value is about 86, and HV0.3 is about 631.
Embodiment 2
Present embodiment provides a kind of hypersonic flame spraying process for self-lubricating wear-resistant coating; It is characterized in that: the concrete spraying process of described hypersonic flame spraying process for self-lubricating wear-resistant coating does; Prepare to be sprayed; Treat spray piece and degrease, carry out the white fused alumina blast then and handle, carry out HVAF at last with acetone;
Wherein: to be sprayed, no metalluster even by the surface behind the blast, after the blast alligatoring, coating thickness is the coating of 350 μ m on to be sprayed; The HVAF processing parameter is specially: spray distance 350mm; Powder feeding rate 35 gram/minute, 1775 liters/hour of oxygen flows, 131 pounds/square inch of oxygen pressures; Kerosene oil flow 5.4 gallons per hours, 113 pounds/square inch of kerosene pressure.
Described dusty spray is provided by Beijing Non-Fervoous Metal Inst., and concrete composition and quality percentage composition are following: Cr
3C
2Account for 53～57%, NiCr accounts for 34～37%, CaF
2, BaF
2Be surplus; The performance requriements of the nickel chromium triangle/chromium carbide powder of fluoride is following: flowability<110s/50g, granularity is in-200～+ 270 order≤5.0% ,-270～+ 325 order≤25.0% ,-325>=70.0% scope.
Described to be sprayed body material can adopt iron and steel or superalloy.
Described to be sprayed body material adopts 1Cr11Ni2W2MoVN.
The anchoring strength of coating scope is 45Mpa.
Described HVAF processing parameter also comprises, 3000 ℃ of flame velocity 1750m/s, temperature.
HVAF is a kind of HVOF technology, and the characteristics so that its flame velocity is high, temperature is low are particularly conducive to the spray coating metal ceramic coating.High velocity of particle helps obtaining high coating compactness and good binding intensity; And low flame temperature can effectively suppress or reduce the decomposition of hard in spraying process such as carbide, makes the coating of preparation keep the weave construction of the original excellent abrasive resistance of sintering metal.HVOF spray coating metal ceramic coating, especially WC-Co, Cr
3C
2-NiCr metal-ceramic coating can make part life prolong 2～10 times with performances such as its superior wear-resistant material wearing and tearing, erosive wear, skimming wears, obtains widespread use at industrial circle.
Chromium carbide/nickel chromium triangle material has excellent high temperature oxidation resistance and hot hardness, often is used to the coating that bonding strength and wear-resisting resistance are had relatively high expectations.But in the Working environment of reality,, friction pair has been produced more serious frictional wear because it has higher hardness.In coating, add lubricants such as Calcium Fluoride (Fluorspan) and barium fluoride, can reduce the frictional coefficient of coating, improve wear resistance.
Adopt the microstructure of Leica metallography microscope sem observation supersonic spray coating chromium carbide/nickel chromium triangle coating.In the supersonic spray coating process, high velocity of particle can form the little dense coating of porosity after making powder and matrix collision, is interlaced between coating and the coating and piles up.
The bonding strength test of adopting homemade universal hydraulic testing machine to test to carry out high-temperature self-lubricating coating, the bonding strength test is carried out with reference to GBT8642-88 " mensuration of metal thermal spraying layer bonding strength ".The anchoring strength of coating scope that records is 43MPa～47.6MPa.
The hardness of coating is the very important mechanical performance index of coating, is related to multiple functions such as abrasion property, intensity and coating work-ing life.
Macrohardness adopts HR15N, in the bonding strength test piece, makes an experiment, and on whole coat side, on average takes get its arithmetical av at 10, and microhardness detects carries out on metallographic specimen, loads the 300g metering.The test detected result is: the HR15N value is between 86～90, and HV0.3 is between 631～661.
Embodiment 3
Present embodiment provides a kind of hypersonic flame spraying process for self-lubricating wear-resistant coating; It is characterized in that: the concrete spraying process of described hypersonic flame spraying process for self-lubricating wear-resistant coating does; Prepare to be sprayed; Treat spray piece and degrease, carry out the white fused alumina blast then and handle, carry out HVAF at last with acetone;
Wherein: to be sprayed, no metalluster even by the surface behind the blast, after the blast alligatoring, coating thickness is the coating of 400 μ m on to be sprayed; The HVAF processing parameter is specially: spray distance 360mm; Powder feeding rate 40 gram/minute, 1800 liters/hour of oxygen flows, 141 pounds/square inch of oxygen pressures; Kerosene oil flow 5.5 gallons per hours, 128 pounds/square inch of kerosene pressure.
Described dusty spray is provided by Beijing Non-Fervoous Metal Inst., and concrete composition and quality percentage composition are following: Cr
3C
2Account for 53～57%, NiCr accounts for 34～37%, CaF
2, BaF
2Be surplus; The performance requriements of the nickel chromium triangle/chromium carbide powder of fluoride is following: flowability<110s/50g, granularity is in-200～+ 270 order≤5.0% ,-270～+ 325 order≤25.0% ,-325>=70.0% scope.
Described to be sprayed body material can adopt iron and steel or superalloy.
The anchoring strength of coating scope is 47.6Mpa.
Described HVAF processing parameter also comprises, 3100 ℃ of flame velocity 2000m/s, temperature.
HVAF is a kind of HVOF technology, and the characteristics so that its flame velocity is high, temperature is low are particularly conducive to the spray coating metal ceramic coating.High velocity of particle helps obtaining high coating compactness and good binding intensity; And low flame temperature can effectively suppress or reduce the decomposition of hard in spraying process such as carbide, makes the coating of preparation keep the weave construction of the original excellent abrasive resistance of sintering metal.HVOF spray coating metal ceramic coating, especially WC-Co, Cr
3C
2-NiCr metal-ceramic coating can make part life prolong 2～10 times with performances such as its superior wear-resistant material wearing and tearing, erosive wear, skimming wears, obtains widespread use at industrial circle.
Chromium carbide/nickel chromium triangle material has excellent high temperature oxidation resistance and hot hardness, often is used to the coating that bonding strength and wear-resisting resistance are had relatively high expectations.But in the Working environment of reality,, friction pair has been produced more serious frictional wear because it has higher hardness.In coating, add lubricants such as Calcium Fluoride (Fluorspan) and barium fluoride, can reduce the frictional coefficient of coating, improve wear resistance.
Adopt the microstructure of Leica metallography microscope sem observation supersonic spray coating chromium carbide/nickel chromium triangle coating.In the supersonic spray coating process, high velocity of particle can form the little dense coating of porosity after making powder and matrix collision, is interlaced between coating and the coating and piles up.
The bonding strength test of adopting homemade universal hydraulic testing machine to test to carry out high-temperature self-lubricating coating, the bonding strength test is carried out with reference to GBT8642-88 " mensuration of metal thermal spraying layer bonding strength ".The anchoring strength of coating scope that records is 43MPa～47.6MPa.
The hardness of coating is the very important mechanical performance index of coating, is related to multiple functions such as abrasion property, intensity and coating work-ing life.
Macrohardness adopts HR15N, in the bonding strength test piece, makes an experiment, and on whole coat side, on average takes get its arithmetical av at 10, and microhardness detects carries out on metallographic specimen, loads the 300g metering.The test detected result is: the HR15N value is between 86～90, and HV0.3 is between 631～661.
Claims (5)
1. hypersonic flame spraying process for self-lubricating wear-resistant coating; It is characterized in that: the concrete spraying process of described hypersonic flame spraying process for self-lubricating wear-resistant coating does; Prepare to be sprayed; Treat spray piece and degrease, carry out the white fused alumina blast then and handle, carry out HVAF at last with acetone; Wherein: answered even roughness, no metalluster by the surface behind the blast for to be sprayed, after the blast alligatoring, coating thickness is the coating of 300～400 μ m on to be sprayed; The HVAF processing parameter is specially: spray distance 340～360mm; Powder feeding rate 30～40 gram/minute, 1750～1800 liters/hour of oxygen flows, 131 ± 10 pounds/square inch of oxygen pressures; Kerosene oil flow 5.3～5.5 gallons per hours, 113 ± 15 pounds/square inch of kerosene pressure.
2. according to the said hypersonic flame spraying process for self-lubricating wear-resistant coating of claim 1, it is characterized in that: concrete composition of described dusty spray and quality percentage composition are following:
Cr
3C
2Account for 53～57%, NiCr accounts for 34～37%, CaF
2, BaF
2Be surplus;
The performance requriements of the nickel chromium triangle/chromium carbide powder of fluoride is following: mobile<110s/50g, granularity is in-200～+ 270 order≤5.0% ,-270～+ 325 order≤25.0% ,-325>=70.0% scope.
3. according to the described hypersonic flame spraying process for self-lubricating wear-resistant coating of claim 1, it is characterized in that: described to be sprayed body material adopts iron and steel or superalloy.
4. according to the described hypersonic flame spraying process for self-lubricating wear-resistant coating of claim 1, it is characterized in that: the anchoring strength of coating scope is 43MPa～47.6Mpa.
5. according to the described hypersonic flame spraying process for self-lubricating wear-resistant coating of claim 1, it is characterized in that: described HVAF characteristics are 2900～3100 ℃ of flame velocity 1500m/s～2000m/s, temperature.
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