CN107740094A - A kind of high temperature seal coating on machine lock and preparation method thereof - Google Patents
A kind of high temperature seal coating on machine lock and preparation method thereof Download PDFInfo
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- CN107740094A CN107740094A CN201710857022.3A CN201710857022A CN107740094A CN 107740094 A CN107740094 A CN 107740094A CN 201710857022 A CN201710857022 A CN 201710857022A CN 107740094 A CN107740094 A CN 107740094A
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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
- C23C24/106—Coating with metal alloys or metal elements only
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
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Abstract
The present invention relates to high temperature seal coating technical field,More particularly to a kind of high temperature seal coating on machine lock and preparation method thereof,The high temperature seal coating is prepared using laser cladding method,The laser melting coating includes high-entropy alloy powder with powder,The high-entropy alloy powder includes nickel 22.0% ~ 25.0% by weight percentage,Chromium 22.0% ~ 24.0%,Iron 20% ~ 24.0%,Aluminium 3.5% 4.9%,Hafnium 0.1% 0.5%,Rare-earth yttrium 0.4% 1.0%,Carbon A% and oxygen B%,Surplus is cobalt,Wherein,A ＜ 0.01,B ＜ 0.05,The thickness of the seal coating is 0.3 0.7mm,The high temperature seal coating of the present invention has preferable high temperature friction and wear behavior and high-temperature oxidation resistance,And hardness is moderate,Blade not easy to wear.
Description
Technical field
The present invention relates to high temperature seal coating technical field, and in particular to a kind of high temperature seal coating on machine lock and
Its preparation method.
Background technology
Seal coating can realize nearly zero control of tip clearance, and the efficiency of aero-engine is significantly increased, and raising is started
Machine thrust, fuel consumption is reduced, is increased the service life, be that aero-engine manufactures indispensable key technology.With aviation
Engine continues to develop to directions such as high thrust-weight ratio, high flow capacity ratios, and the temperature of combustion gas constantly raises, the work at hot-end component turbine
1100 DEG C are alreadyd exceed as temperature, very high want is proposed to the high-temperature abradable seal coating at the positions such as high-pressure turbine outer shroud
Ask.Coating is not required nothing more than with higher abradability, erosion wear resistance and bond strength etc., but also it is excellent to require that coating has
Resistance to high temperature oxidation, high-temperature thermal stability and thermal shock resistance.The seal coating such as NiCrAl/ bentonites of the preparation of thermal spraying at present,
The anti-oxidant of coating, the corrosion resistances such as NiCrAl/ diatomite, MCrAlY/ polybenzoate are insufficient, when usage temperature is more than 1000 DEG C
Coating abradability can be remarkably decreased.The zirconium oxide (YSZ) of stabilized with yttrium oxide is due to preferable heat-proof quality and Metal Substrate
The matching and anti-sintering property of body, it is considered as can be used for more than 1000 DEG C and promising high-temperature abradable seal coating is important
Candidate material.But the hardness in the ceramic base high-temperature abradable seal coating ground is higher, holds during being contacted with blade tip
Blade easy to wear, although researcher, which attempts to use, introduces the improvement of the compositions such as polybenzoate, h-BN to strengthen the abradability of the coating,
But the weakening of the combination properties such as bond strength, Anti-erosion is caused therewith.
Therefore, be badly in need of in the market a kind of high-temperature behavior well simultaneously the high temperature seal coating high with substrate combinating strength and
Its preparation method.
The content of the invention
The present invention provides a kind of high temperature seal coating on machine lock, and bond strength is high between matrix, not only has
Preferable high temperature friction and wear behavior and high-temperature oxidation resistance, and hardness is moderate, blade not easy to wear.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：A kind of high temperature seal coating on machine lock, institute
State high temperature seal coating to prepare using laser cladding method, the laser melting coating includes high-entropy alloy powder, the height with powder
Entropy alloy powder includes by weight percentage：
Nickel 22.0%~25.0%；
Chromium 22.0%~24.0%；
Iron 20%~24.0%；
Aluminium 3.5%-4.9%；
Hafnium 0.1%-0.5%；
Rare-earth yttrium 0.4%-1.0%；
Carbon A%, A ＜ 0.01；
Oxygen B%, B ＜ 0.05；
Surplus is cobalt；
The thickness of the seal coating is 0.3-0.7mm.
Further, by weight percentage, the laser melting coating is included with powder：23.0% nickel, 22.5% chromium,
22.0% iron, 4.2% aluminium, 0.3% hafnium, 0.6% rare-earth yttrium, A% carbon and B% oxygen, surplus is cobalt, wherein, A
＜ 0.01, B ＜ 0.05.
Further, the laser melting coating also includes the CaF being well mixed with the high-entropy alloy powder with powder2Powder
End, the CaF2The quality of powder accounts for the 5%-30% of the high-entropy alloy powder quality.
Further, by weight percentage, the laser melting coating is included with powder：24.5% nickel, 23.0% chromium,
23.5% iron, 4.0% aluminium, 0.4% hafnium, 0.5% rare-earth yttrium, A% carbon and B% oxygen, surplus is cobalt, wherein, A
＜ 0.01, B ＜ 0.05, the laser melting coating powder is by the high-entropy alloy powder and CaF2Powder constituent, the CaF2Powder
Quality account for the 10% of the high-entropy alloy powder quality.
Further, by weight percentage, the laser melting coating is included with powder：23.5% nickel, 22.8% chromium,
21.5% iron, 4.2% aluminium, 0.3% hafnium, 0.6% rare-earth yttrium, A% carbon and B% oxygen, surplus is cobalt, wherein, A
＜ 0.01, B ＜ 0.05, the laser melting coating powder is by the high-entropy alloy powder and CaF2Powder constituent, the CaF2Powder
Quality account for the 15% of the high-entropy alloy powder quality.
Further, the granularity of the high-entropy alloy powder is the mesh of 100 mesh~350.
The present invention also provides a kind of method for preparing above-mentioned high temperature seal coating, comprises the following steps：
(1) laser head of laser is aligned to the surface of the machine lock；
(2) the laser melting coating powder is uniformly sent on the machine lock surface being aligned to the laser head；
(3) laser head sends the above-mentioned laser melting coating powder of laser fusion, and reactant caused by fusing is covered in machine
Lock surface, form cladding layer；
(4) preset range of the laser head on the machine lock surface is scanned, and realizes the company on the preset range surface
Continuous cladding, that is, obtain the high temperature seal coating.
Further, in the step (2), laser beam is hollow ring-shaped, and the laser melting coating is located at powder
The ring-shaped inner part of the laser beam, the laser beam, which is surround, surrounds the laser melting coating powder, and the laser melting coating
It is coaxial all the time with the powder beam that powder is formed during powder feeding and the laser beam.
Further, the laser head is first along a certain default straight in the scanning pattern of the machine lock surface programming scope
Designated length is moved in line direction by starting point, closes laser, and laser head is moved into next starting point, starts laser again
Be scanned, the laser single pass formed for single track cladding layer, repeat the above steps, current road cladding layer covered
The preceding road cladding layer of cover, form the overlap joint of current road cladding layer and preceding road cladding layer.
Further, the power of the laser is 800-1000W, laser scanning speed 6-10mm/s, and defocusing amount is
0-3mm, powder feeding rate 8-12g/min.
After above technical scheme, the present invention has the following advantages that compared with prior art：Cobalt-based provided by the invention
High temperature seal coating alloy powder contains cobalt, nickel, chromium, iron, aluminium element, these elements can be formed stable γ-(Co, Ni,
Cr the Y of small and dispersed is separated out at) solid solution, and sub boundary2O3.Dense structure, γ-(Co, Ni, the Cr) of excellent heat stability
Solid solution has good high temperature friction and wear behavior and high temperature oxidation resistance.It can enter one by the form for changing substructure
Step improves the high temperature seal coating such as high temperature friction and wear behavior, the engine that is particularly suitable for use in.Using the hollow inner-light powder-supplying of laser into
Shape technology makes optical beam transformation precisely easily-controllable, and powder convergence is good, the whole coupling of light powder, realizes surface defect self-healing, can be effective
Avoid the generation of microfissure, surface quality is good.
Brief description of the drawings
Accompanying drawing 1 is the metallographic structure figure that the embodiment of the present invention 1 obtains, wherein, figure a1 and b1 has different multiplication factors；
Accompanying drawing 2 is the metallographic structure figure that the embodiment of the present invention 2 obtains, wherein, figure a2 and b2 has different multiplication factors；
Accompanying drawing 3 is the metallographic structure figure that the embodiment of the present invention 3 obtains, wherein, figure a3 and b3 has different multiplication factors；
Accompanying drawing 4 is the metallographic structure figure that the embodiment of the present invention 4 obtains, wherein, figure a4 and b4 has different multiplication factors.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the invention will be further described.
The present invention provides a kind of high-entropy alloy powder for laser melting coating high temperature seal coating, by weight percentage,
Including：Nickel 22.0%~25.0%, chromium 22.0%~24.0%, iron 20%~24.0%, aluminium 3.5%-4.9%, hafnium 0.1%-
0.5%th, rare-earth yttrium 0.4%-1.0%, carbon A%, oxygen B%, surplus are cobalt, wherein, A ＜ 0.01, B ＜ 0.05.
The present invention also provides a kind of method for preparing above-mentioned high-entropy alloy powder, comprises the following steps that：Dispensing → outstanding
Floating melting → vacuum aerosolization → drying → screening.
Concrete technology step is as follows：
(1) dispensing：Use the ratio of nickel source, cobalt source, chromium source, source of iron, silicon source, hafnium source and yttrium source for raw material according to target component
Example carries out dispensing；
(2) smelting in suspension：The material prepared is put into magnesia crucible, magnesia crucible is put into vacuum levitation melting stove
In；Fusion temperature is 1400-1600 DEG C, and control carbon content reaches requirement, after stokehold adjusting component is qualified, controls the tapping temperature to be
1300~1500 DEG C；
(3) vacuum aerosolization：Alloy powder is made in alloy molten solution atomization made from step (2), atomizing medium is argon gas,
The pressure of atomization is 4.5~10MPa；
(4) dry：The alloy powder in step (3) is dried using coated infrared drier, drying temperature be 200~
250℃；
(5) sieve：The alloy powder after drying is sifted out into particle size range by sieving machine for the mesh powder of 100 mesh~350 to make
For finished powder, as required high-entropy alloy powder.
Wherein, the raw material used in the present invention is commercial goods.
The source of iron can be pure iron, in embodiments of the invention, iron content >=99.99% of source of iron.
The nickel source can be pure nickel, in embodiments of the invention, nickel content >=99.96% of nickel source.
The cobalt source can be pure cobalt, in embodiments of the invention, cobalt content >=99.98% of cobalt source.
The chromium source can be pure chromium, in embodiments of the invention, chromium content >=99.95% in chromium source.
The hafnium source can be pure hafnium, in embodiments of the invention, hafnium content >=99.7% in hafnium source.
The yttrium source can be pure yttrium, in embodiments of the invention, yttrium content >=99.7% in yttrium source.
Source of aluminium can be fine aluminium, in embodiments of the invention, aluminium content >=99.5% of silicon source.
Above-mentioned nickel source, cobalt source, chromium source, source of iron, silicon source, hafnium source and the source in yttrium source do not limit, and can such as use Jinchuan 1#
Nickel, Jinchuan 1# cobalts.
The specification for the suspension smelting furnace that the present invention uses is as follows：Capacity 0.05T, 120 kilowatts of rated power, frequency 2.5 thousand
Hertz, final vacuum 6.7 × 10-3MmHg, 1700 DEG C of rated temperature, 1.5 tons of weight, control voltage 220V.The present invention uses
Suspension smelting furnace, the uniformity of alloy solution can be improved, reduce segregation.
The specification for the vacuum gas atomization device that the present invention uses is as follows：Capacity 0.05T, 120 kilowatts of rated power, frequency
2.5 KHzs, final vacuum 6.7 × 10-3mmHg。
Using GB/T223《Steel and alloy analysis method》Standard, test as the high entropy obtained by above-mentioned steps
The composition of alloy powder, testing result be, by weight percentage, including：Nickel 22.0%~25.0%, chromium 22.0%~
24.0%th, iron 20%~24.0%, aluminium 3.5%-4.9%, hafnium 0.1%-0.5%, rare-earth yttrium 0.4%-1.0%, carbon A%, oxygen
B%, surplus are cobalt, wherein, A ＜ 0.01, B ＜ 0.05.
Above-mentioned high-entropy alloy powder is cooled to after room temperature and carries out Laser Cladding Treatment on machine lock surface, high temperature is prepared and obturages
Coating, Laser Cladding Treatment of the invention use the hollow inner-light powder-supplying forming technique of laser, comprised the following steps：
(1) laser head of laser is aligned to the surface of the machine lock；
(2) laser melting coating powder is uniformly sent on the machine lock surface being aligned to laser head, and laser beam is hollow annular
Shape, laser melting coating are located at the ring-shaped inner part of laser beam with powder, and laser beam, which is surround, surrounds laser melting coating powder, and laser
Cladding is coaxial all the time with the powder beam that powder is formed during powder feeding and laser beam, powder feeding rate 8-12g/min；
(3) laser head sends the above-mentioned laser melting coating powder of laser fusion, and reactant caused by fusing is covered in machine lock table
Face, cladding layer is formed, the power of laser is 800-1000W, defocusing amount 0-3mm；
(4) preset range of the laser head on machine lock surface is scanned, and its sweep speed is 6-10mm/s, its scanning pattern
To move designated length by starting point along a certain default rectilinear direction first, laser is closed, laser head is moved to next
Initial point, start laser and be scanned again, the laser single pass formed for single track cladding layer, repeat above-mentioned step
Suddenly, by the preceding road cladding layer of current road cladding layer covering part, the overlap joint of current road cladding layer and preceding road cladding layer is formed, so as to
The continuous cladding of machine lock surface programming scope is realized, that is, obtains required high temperature seal coating.
Using the hollow inner-light powder-supplying forming technique of laser, optical beam transformation is precisely easily-controllable, and powder convergence is good, light powder whole process coupling
Close, realize surface defect self-healing, surface quality is good, breaches more powder beam convergence interference, splashing radiates big, defocus and tilt quick
Sense, it is peripheral in addition to protect gas that there is good protective effect for molten bath, avoid the generation of high-temperature oxydation and slag inclusion.In the present invention
In the laser cladding process of high temperature seal coating, the annulus temperature field energy of the technology enough reduces the setting rate and temperature of metal bath
Gradient is spent, is also beneficial to improve thermal stress and residual stress, avoids the generation of microfissure.The hollow inner-light powder-supplying technology of laser exists
Dilution rate is low in cladding process, does not change the composition of alloy powder substantially, effectively improves the protective effect of alloy.
Metallographic structure observation will be carried out after the grinding of above-mentioned high temperature seal coating, polishing, corrosion, it can be seen that high temperature obturages painting
Contain γ-(Co, Ni, Cr) tissue and substantial amounts of Y in layer2O3Precipitated phase.
It is as follows to the Action Specification of each element in the high-entropy alloy powder of the present invention：
(1) cobalt, nickel, chromium, iron, aluminium element can form stable γ-(Co, Ni, Cr) solid solution, be separated out at sub boundary thin
The Y of small disperse2O3, the Y of disperse2O3The wearability of high temperature seal coating can be effectively improved by playing invigoration effect；And due to
γ-the dense structure of (Co, Ni, Cr) solid solution, excellent heat stability, high temperature seal coating is set to possess good high temperature friction mill
Damage performance and high temperature oxidation resistance；
(2) hafnium element can be effectively improved the high temperature resistant property of high temperature seal coating；
(3) nickel in the present invention, chromium, the content of three kinds of elements of iron approach, and expensive nickel element and cobalt element account for
Than relatively low, thus it can effectively reduce production cost.
(4) proportioning of high-entropy alloy powder is adopted in causing prepared high temperature seal coating compared with the prior art in the present invention
The cobalt-based high-temperature seal coating hardness obtained with thermal spraying is moderate, the blade not easy to wear during being contacted with blade tip.
(5) granularity selection of laser melting coating alloy powder of the present invention is appropriate, has well in laser cladding process
Mobility, powder are sent out uniform, can be melted rapidly in laser cladding process and not ablated loss.
It is specific embodiment below：
Embodiment 1
The target component of cobalt-based high-temperature seal coating by weight percentage, including 22%Ni, 22%Cr, 20%Fe,
32%Co, 3.5%Al and 0.5%Y and 0.5%Hf；
Pure nickel, pure chromium, pure cobalt, pure iron, pure yttrium, fine aluminium and pure hafnium are subjected to dispensing according to above-mentioned target component；It will prepare
Material be put into magnesia crucible, magnesia crucible is put into vacuum levitation melting stove；Fusion temperature is 1500 DEG C, controls carbon
Content reaches requirement, after stokehold adjusting component is qualified, 1380 DEG C of tapping temperature；Alloy molten solution is atomized to prepare alloy powder,
Atomizing medium is argon gas, atomizing pressure 6MPa；Alloy powder is dried using coated infrared drier, drying temperature is
210℃；Then it is the mesh powder of 100 mesh~350 as finished powder to sift out particle size range by sieving machine.
Above-mentioned finished powder is cooled to after room temperature and carries out Laser Cladding Treatment on machine lock surface：Using being sent in laser hollow light
Powder forming technique, laser power 800W, sweep speed 8mm/s, defocusing amount 1mm, powder sending quantity 10g/min.
Metallographic structure observation, obtained gold will be carried out after the above-mentioned high temperature seal coating grinding being prepared, polishing, corrosion
Phase constitution picture as shown in figure 1, as shown in Figure 1, in the high temperature seal coating that the embodiment of the present invention 1 is prepared containing γ-
The Y of small and dispersed is separated out at (Co, Ni, Cr) solid solution, and sub boundary2O3.The height that the test embodiment of the present invention 1 is prepared
The composition and high-temperature behavior of warm seal coating, test result is as shown in table 1, and table 1 provides for each embodiment of the present invention
The composition and high-temperature behavior test result of high temperature seal coating.
Embodiment 2
High temperature seal coating, as different from Example 1, the present embodiment is prepared according to the method described in embodiment 1
Dispensing is carried out according to following high temperature seal coating target components, the target component of high temperature seal coating by weight percentage, wraps
Include：23%Ni, 23%Cr, 21%Fe, 28%Co, 4.5%Al, 0.5%Y and 0.2%Hf；The preparation process of high-entropy alloy powder
In, fusion temperature is 1600 DEG C, 1450 DEG C, atomizing pressure 4.5MPa of tapping temperature, and the drying temperature of coated infrared drier is
250℃；In laser cladding process, laser power 1000W, sweep speed 10mm/s, defocusing amount 2mm, powder sending quantity is
12g/min.Fig. 2 is the tissue picture for the high temperature seal coating that the embodiment of the present invention 2 is prepared.
According to the method described in embodiment 1, the composition for the high temperature seal coating that the test embodiment of the present invention 2 is prepared and
High-temperature behavior test result, test result are as shown in table 1.
Embodiment 3
High temperature seal coating is prepared according to the method described in embodiment 1, as different from Example 1, according to following
High temperature seal coating target component progress dispensing, the target component of high temperature seal coating, by weight percentage, including：25%
Ni, 24%Cr, 24%Fe, 21.1%Co, 4.9%Al, 1.0%Y and 0.4%Hf；In the preparation process of high-entropy alloy powder,
Fusion temperature is 1450 DEG C, 1300 DEG C, atomizing pressure 8MPa of tapping temperature, and the drying temperature of coated infrared drier is 230 DEG C；
In laser cladding process, laser power 900W, sweep speed 7.5mm/s, defocusing amount 1.8mm, powder sending quantity 9g/min.
Fig. 3 is the tissue picture for the high temperature seal coating that the embodiment of the present invention 3 is prepared.
According to the method described in embodiment 1, the composition for the high temperature seal coating that the test embodiment of the present invention 3 is prepared and
High-temperature behavior test result, test result are as shown in table 1.
Embodiment 4
According in embodiment 2 high-entropy alloy powder target component carry out dispensing, as different from Example 2, using
CaF is added by ball grinding method in the high-entropy alloy powder prepared2Powder, CaF2The quality of powder accounts for high-entropy alloy powder matter
10%, CaF of amount2For improving Solidification Structures.
According to the method described in embodiment 1, high temperature seal coating is prepared to the embodiment of the present invention 4 and carries out metallographic structure
Observation, observation result is as shown in figure 4, substructure type is changed into strip structure, high temperature friction and wear form by network structure
There is adhesive wear to be converted into abrasive wear, the high temperature friction and wear behavior of high temperature seal coating is made moderate progress.
According to the method described in embodiment 1, the composition for the high temperature seal coating that the test embodiment of the present invention 4 is prepared and
High-temperature behavior test result is as shown in table 1.
The composition and high-temperature behavior test result for the high temperature seal coating alloy powder that the various embodiments of the present invention of table 1 provide.
Table 1
As shown in Table 1, the high temperature seal coating that the embodiment of the present invention is prepared has preferable high temperature friction and wear
Can and high-temperature oxidation resistance, and to compare prior art more moderate for the obtained hardness of high temperature seal coating of the present invention, thus
Blade easy to wear is not allowed during being contacted with blade tip.
As seen from the above embodiment, using laser cladding method, the made high-entropy alloy powder of the present invention is prepared into high temperature
Seal coating, because the cobalt in high-entropy alloy powder, nickel, chromium, iron, aluminium element can form stable γ-(Co, Ni, Cr) admittedly
The Y of small and dispersed is separated out at solution, and sub boundary2O3.Dense structure, γ-(Co, Ni, Cr) solid solution of excellent heat stability
With good high temperature friction and wear behavior and high temperature oxidation resistance, can further be improved by the form for changing substructure
The high temperature seal coating such as high temperature friction and wear behavior, the engine that is particularly suitable for use in.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, it should all be included within the scope of the present invention.
Claims (10)
1. a kind of high temperature seal coating on machine lock, it is characterised in that the high temperature seal coating uses laser melting coating side
Prepared by method, the laser melting coating includes high-entropy alloy powder with powder, and the high-entropy alloy powder includes by weight percentage：
Nickel 22.0% ~ 25.0%；
Chromium 22.0% ~ 24.0%；
Iron 20% ~ 24.0%；
The 5%-4.9% of aluminium 3.；
Hafnium 0.1%-0.5%；
Rare-earth yttrium 0.4%-1.0%；
Carbon A%, A ＜ 0.01；
Oxygen B%, B ＜ 0.05；
Surplus is cobalt；
The thickness of the seal coating is 0.3-0.7mm.
2. a kind of high temperature seal coating on machine lock according to claim 1, it is characterised in that with percetage by weight
Meter, the laser melting coating are included with powder：23.0% nickel, 22.5% chromium, 22.0% iron, 4.2% aluminium, 0.3% hafnium,
The oxygen of 0.6% rare-earth yttrium, A% carbon and B%, surplus are cobalt, wherein, A ＜ 0.01, B ＜ 0.05.
A kind of 3. high temperature seal coating on machine lock according to claim 1, it is characterised in that：The laser melting coating
Also include the CaF being well mixed with the high-entropy alloy powder with powder2Powder, the CaF2The quality of powder accounts for the high entropy
The 5%-30% of alloy powder quality.
4. a kind of high temperature seal coating on machine lock according to claim 3, it is characterised in that with percetage by weight
Meter, the laser melting coating are included with powder：24.5% nickel, 23.0% chromium, 23.5% iron, 4.0% aluminium, 0.4% hafnium,
The oxygen of 0.5% rare-earth yttrium, A% carbon and B%, surplus are cobalt, wherein, A ＜ 0.01, B ＜ 0.05, the laser melting coating powder
By the high-entropy alloy powder and CaF2Powder constituent, the CaF2The quality of powder accounts for the high-entropy alloy powder quality
10%。
5. a kind of high temperature seal coating on machine lock according to claim 3, it is characterised in that with percetage by weight
Meter, the laser melting coating are included with powder：23.5% nickel, 22.8% chromium, 21.5% iron, 4.2% aluminium, 0.3% hafnium,
The oxygen of 0.6% rare-earth yttrium, A% carbon and B%, surplus are cobalt, wherein, A ＜ 0.01, B ＜ 0.05, the laser melting coating powder
By the high-entropy alloy powder and CaF2Powder constituent, the CaF2The quality of powder accounts for the high-entropy alloy powder quality
15%。
A kind of 6. high temperature seal coating on machine lock according to any one of claim 1 to 5, it is characterised in that：Institute
The granularity of high-entropy alloy powder is stated as the mesh of 100 mesh~350.
A kind of 7. method for being used to prepare the high temperature seal coating described in any one of claim 1 to 6, it is characterised in that including
Following steps：
（1）The laser head of laser is aligned to the surface of the machine lock；
（2）The laser melting coating powder is uniformly sent on the machine lock surface being aligned to the laser head；
（3）The laser head sends the above-mentioned laser melting coating powder of laser fusion, and reactant caused by fusing is covered in machine lock table
Face, form cladding layer；
（4）Preset range of the laser head on the machine lock surface is scanned, and realizes the continuous molten of the preset range surface
Cover, that is, obtain the high temperature seal coating.
A kind of 8. method for preparing high temperature seal coating according to claim 7, it is characterised in that：The step
（2）In, laser beam is hollow ring-shaped, and the laser melting coating is located at the ring-shaped inner part of the laser beam, institute with powder
State laser beam and surround the encirclement laser melting coating powder, and the powder that the laser melting coating is formed with powder during powder feeding
Beam is coaxial all the time with the laser beam.
A kind of 9. method for preparing high temperature seal coating according to claim 8, it is characterised in that：The laser head
In the scanning pattern of the machine lock surface programming scope to move designated length by starting point along a certain default rectilinear direction first, close
Laser is closed, laser head is moved into next starting point, starts laser and is scanned again, the laser single pass
Formed for single track cladding layer, repeat the above steps, the preceding road cladding layer of current road cladding layer covering part formed current
The overlap joint of road cladding layer and preceding road cladding layer.
10. a kind of method for preparing high temperature seal coating according to any one of claim 7 to 9, the laser
Power be 800-1000W, laser scanning speed 6-10mm/s, defocusing amount 0-3mm, powder feeding rate 8-12g/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710857022.3A CN107740094B (en) | 2017-09-18 | 2017-09-18 | High-temperature sealing coating for machine brake and preparation method thereof |
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| CN114951633A (en) * | 2022-05-05 | 2022-08-30 | 苏州大学 | High-aluminum high-entropy alloy super wear-resistant corrosion-resistant coating and preparation method thereof |
| CN114951633B (en) * | 2022-05-05 | 2023-12-12 | 苏州大学 | Super wear-resistant and corrosion-resistant coating of high-aluminum high-entropy alloy and preparation method thereof |
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